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REJ09B0458-0010
16
R8C/32A Group
Hardware Manual
RENESAS MCU M16C FAMILY / R8C/Tiny SERIES
Preliminary
All information contained in these materials, including products and product specifications, represents information on the product at the time of publication and is subject to change by Renesas Technology Corp. without notice. Please review the latest information published by Renesas Technology Corp. through various means, including the Renesas Technology Corp. website (http://www.renesas.com).
Rev.0.10 Revision Date: Apr 01, 2008
www.renesas.com
Notes regarding these materials
1. This document is provided for reference purposes only so that Renesas customers may select the appropriate Renesas products for their use. Renesas neither makes warranties or representations with respect to the accuracy or completeness of the information contained in this document nor grants any license to any intellectual property rights or any other rights of Renesas or any third party with respect to the information in this document. 2. Renesas shall have no liability for damages or infringement of any intellectual property or other rights arising out of the use of any information in this document, including, but not limited to, product data, diagrams, charts, programs, algorithms, and application circuit examples. 3. You should not use the products or the technology described in this document for the purpose of military applications such as the development of weapons of mass destruction or for the purpose of any other military use. When exporting the products or technology described herein, you should follow the applicable export control laws and regulations, and procedures required by such laws and regulations. 4. All information included in this document such as product data, diagrams, charts, programs, algorithms, and application circuit examples, is current as of the date this document is issued. Such information, however, is subject to change without any prior notice. Before purchasing or using any Renesas products listed in this document, please confirm the latest product information with a Renesas sales office. Also, please pay regular and careful attention to additional and different information to be disclosed by Renesas such as that disclosed through our website. (http://www.renesas.com ) 5. Renesas has used reasonable care in compiling the information included in this document, but Renesas assumes no liability whatsoever for any damages incurred as a result of errors or omissions in the information included in this document. 6. When using or otherwise relying on the information in this document, you should evaluate the information in light of the total system before deciding about the applicability of such information to the intended application. Renesas makes no representations, warranties or guaranties regarding the suitability of its products for any particular application and specifically disclaims any liability arising out of the application and use of the information in this document or Renesas products. 7. With the exception of products specified by Renesas as suitable for automobile applications, Renesas products are not designed, manufactured or tested for applications or otherwise in systems the failure or malfunction of which may cause a direct threat to human life or create a risk of human injury or which require especially high quality and reliability such as safety systems, or equipment or systems for transportation and traffic, healthcare, combustion control, aerospace and aeronautics, nuclear power, or undersea communication transmission. If you are considering the use of our products for such purposes, please contact a Renesas sales office beforehand. Renesas shall have no liability for damages arising out of the uses set forth above. 8. Notwithstanding the preceding paragraph, you should not use Renesas products for the purposes listed below: (1) artificial life support devices or systems (2) surgical implantations (3) healthcare intervention (e.g., excision, administration of medication, etc.) (4) any other purposes that pose a direct threat to human life Renesas shall have no liability for damages arising out of the uses set forth in the above and purchasers who elect to use Renesas products in any of the foregoing applications shall indemnify and hold harmless Renesas Technology Corp., its affiliated companies and their officers, directors, and employees against any and all damages arising out of such applications. 9. You should use the products described herein within the range specified by Renesas, especially with respect to the maximum rating, operating supply voltage range, movement power voltage range, heat radiation characteristics, installation and other product characteristics. Renesas shall have no liability for malfunctions or damages arising out of the use of Renesas products beyond such specified ranges. 10. Although Renesas endeavors to improve the quality and reliability of its products, IC products have specific characteristics such as the occurrence of failure at a certain rate and malfunctions under certain use conditions. Please be sure to implement safety measures to guard against the possibility of physical injury, and injury or damage caused by fire in the event of the failure of a Renesas product, such as safety design for hardware and software including but not limited to redundancy, fire control and malfunction prevention, appropriate treatment for aging degradation or any other applicable measures. Among others, since the evaluation of microcomputer software alone is very difficult, please evaluate the safety of the final products or system manufactured by you. 11. In case Renesas products listed in this document are detached from the products to which the Renesas products are attached or affixed, the risk of accident such as swallowing by infants and small children is very high. You should implement safety measures so that Renesas products may not be easily detached from your products. Renesas shall have no liability for damages arising out of such detachment. 12. This document may not be reproduced or duplicated, in any form, in whole or in part, without prior written approval from Renesas. 13. Please contact a Renesas sales office if you have any questions regarding the information contained in this document, Renesas semiconductor products, or if you have any other inquiries.
General Precautions in the Handling of MPU/MCU Products
The following usage notes are applicable to all MPU/MCU products from Renesas. For detailed usage notes on the products covered by this manual, refer to the relevant sections of the manual. If the descriptions under General Precautions in the Handling of MPU/MCU Products and in the body of the manual differ from each other, the description in the body of the manual takes precedence. 1. Handling of Unused Pins Handle unused pins in accord with the directions given under Handling of Unused Pins in the manual. The input pins of CMOS products are generally in the high-impedance state. In operation with an unused pin in the open-circuit state, extra electromagnetic noise is induced in the vicinity of LSI, an associated shoot-through current flows internally, and malfunctions occur due to the false recognition of the pin state as an input signal become possible. Unused pins should be handled as described under Handling of Unused Pins in the manual. 2. Processing at Power-on The state of the product is undefined at the moment when power is supplied. The states of internal circuits in the LSI are indeterminate and the states of register settings and pins are undefined at the moment when power is supplied. In a finished product where the reset signal is applied to the external reset pin, the states of pins are not guaranteed from the moment when power is supplied until the reset process is completed. In a similar way, the states of pins in a product that is reset by an on-chip power-on reset function are not guaranteed from the moment when power is supplied until the power reaches the level at which resetting has been specified. 3. Prohibition of Access to Reserved Addresses Access to reserved addresses is prohibited. The reserved addresses are provided for the possible future expansion of functions. Do not access these addresses; the correct operation of LSI is not guaranteed if they are accessed. 4. Clock Signals After applying a reset, only release the reset line after the operating clock signal has become stable. When switching the clock signal during program execution, wait until the target clock signal has stabilized. When the clock signal is generated with an external resonator (or from an external oscillator) during a reset, ensure that the reset line is only released after full stabilization of the clock signal. Moreover, when switching to a clock signal produced with an external resonator (or by an external oscillator) while program execution is in progress, wait until the target clock signal is stable. 5. Differences between Products Before changing from one product to another, i.e. to one with a different part number, confirm that the change will not lead to problems. The characteristics of MPU/MCU in the same group but having different part numbers may differ because of the differences in internal memory capacity and layout pattern. When changing to products of different part numbers, implement a system-evaluation test for each of the products.
How to Use This Manual
1. Purpose and Target Readers
This manual is designed to provide the user with an understanding of the hardware functions and electrical characteristics of the MCU. It is intended for users designing application systems incorporating the MCU. A basic knowledge of electric circuits, logical circuits, and MCUs is necessary in order to use this manual. The manual comprises an overview of the product; descriptions of the CPU, system control functions, peripheral functions, and electrical characteristics; and usage notes. Particular attention should be paid to the precautionary notes when using the manual. These notes occur within the body of the text, at the end of each section, and in the Usage Notes section.
The revision history summarizes the locations of revisions and additions. It does not list all revisions. Refer to the text of the manual for details. The following documents apply to the R8C/32A Group. Make sure to refer to the latest versions of these documents. The newest versions of the documents listed may be obtained from the Renesas Technology Web site. Description Document Title Document No. REJ03B0229 Hardware overview and electrical characteristics R8C/32A Group Datasheet R8C/32A Group This hardware Hardware manual Hardware specifications (pin assignments, Hardware Manual manual memory maps, peripheral function specifications, electrical characteristics, timing charts) and operation description Note: Refer to the application notes for details on using peripheral functions. Software manual Description of CPU instruction set R8C/Tiny Series REJ09B0001 Software Manual Available from Renesas Application note Information on using peripheral functions and Technology Web site. application examples Sample programs Information on writing programs in assembly language and C Renesas Product specifications, updates on documents, technical update etc. Document Type Datasheet
2.
Notation of Numbers and Symbols
The notation conventions for register names, bit names, numbers, and symbols used in this manual are described below. (1) Register Names, Bit Names, and Pin Names Registers, bits, and pins are referred to in the text by symbols. The symbol is accompanied by the word "register," "bit," or "pin" to distinguish the three categories. Examples the PM03 bit in the PM0 register P3_5 pin, VCC pin (2) Notation of Numbers The indication "b" is appended to numeric values given in binary format. However, nothing is appended to the values of single bits. The indication "h" is appended to numeric values given in hexadecimal format. Nothing is appended to numeric values given in decimal format. Examples Binary: 11b Hexadecimal: EFA0h Decimal: 1234
3.
Register Notation
The symbols and terms used in register diagrams are described below.
x.x.x
XXX Register (Symbol)
b6 XXX6 0 b5 XXX5 0 Bit Name
b1 b0
Address XXXXh Bit b7 Symbol XXX7 After Reset 0 Bit b0 b1
b4 XXX4 0
b3 -- 0
b2 -- 0
b1 XXX1 0 Function
b0 XXX0 0
*1
Symbol XXX0 XXX bit XXX1
b2 b3 b4 b5 b6 b7
-- -- XXX4 XXX5 XXX6 XXX7
0 0: XXX 0 1: XXX 1 0: Do not set. 1 1: XXX Nothing is assigned. If necessary, set to 0. When read, the content is undefined. Reserved bit Set to 0. XXX bit Function varies according to the operating mode.
R/W R/W R/W
XXX bit
0: XXX 1: XXX
-- R/W R/W W R/W R
*2
*3
*1 R/W: Read and write. R: Read only. W: Write only. -: Nothing is assigned. *2 * Reserved bit Reserved bit. Set to specified value. *3 * Nothing is assigned. Nothing is assigned to the bit. As the bit may be used for future functions, if necessary, set to 0. * Do not set to a value. Operation is not guaranteed when a value is set. * Function varies according to the operating mode. The function of the bit varies with the peripheral function mode. Refer to the register diagram for information on the individual modes.
4.
List of Abbreviations and Acronyms
Abbreviation ACIA bps CRC DMA DMAC GSM Hi-Z IEBus I/O IrDA LSB MSB NC PLL PWM SFR SIM UART VCO Full Form Asynchronous Communication Interface Adapter bits per second Cyclic Redundancy Check Direct Memory Access Direct Memory Access Controller Global System for Mobile Communications High Impedance Inter Equipment Bus Input/Output Infrared Data Association Least Significant Bit Most Significant Bit Non-Connection Phase Locked Loop Pulse Width Modulation Special Function Register Subscriber Identity Module Universal Asynchronous Receiver/Transmitter Voltage Controlled Oscillator
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Table of Contents
SFR Page Reference ........................................................................................................................... B - 1 1. Overview ......................................................................................................................................... 1 1.1 1.1.1 1.1.2 1.2 1.3 1.4 1.5 2. Features ..................................................................................................................................................... Applications .......................................................................................................................................... Specifications ........................................................................................................................................ Product List ............................................................................................................................................... Block Diagram ......................................................................................................................................... Pin Assignment .......................................................................................................................................... Pin Functions ............................................................................................................................................. 1 1 2 4 5 6 8
Central Processing Unit (CPU) ..................................................................................................... 10 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.8.1 2.8.2 2.8.3 2.8.4 2.8.5 2.8.6 2.8.7 2.8.8 2.8.9 2.8.10 Data Registers (R0, R1, R2, and R3) ...................................................................................................... Address Registers (A0 and A1) ............................................................................................................... Frame Base Register (FB) ....................................................................................................................... Interrupt Table Register (INTB) .............................................................................................................. Program Counter (PC) ............................................................................................................................. User Stack Pointer (USP) and Interrupt Stack Pointer (ISP) .................................................................. Static Base Register (SB) ........................................................................................................................ Flag Register (FLG) ................................................................................................................................ Carry Flag (C) ..................................................................................................................................... Debug Flag (D) ................................................................................................................................... Zero Flag (Z) ....................................................................................................................................... Sign Flag (S) ....................................................................................................................................... Register Bank Select Flag (B) ............................................................................................................ Overflow Flag (O) .............................................................................................................................. Interrupt Enable Flag (I) ..................................................................................................................... Stack Pointer Select Flag (U) .............................................................................................................. Processor Interrupt Priority Level (IPL) ............................................................................................. Reserved Bit ........................................................................................................................................ 11 11 11 11 11 11 11 11 11 11 11 11 11 11 12 12 12 12
3. 3.1 4. 5.
Memory ......................................................................................................................................... 13 R8C/32A Group ...................................................................................................................................... 13 Special Function Registers (SFRs) ............................................................................................... 14 Resets ........................................................................................................................................... 26 5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.2 5.2.1 5.2.2 5.3 5.4 5.5 5.6 Registers .................................................................................................................................................. Processor Mode Register 0 (PM0) ...................................................................................................... Reset Source Determination Register (RSTFR) ................................................................................. Option Function Select Register (OFS) .............................................................................................. Option Function Select Register 2 (OFS2) ......................................................................................... Hardware Reset ....................................................................................................................................... When Power Supply is Stable ............................................................................................................. Power On ............................................................................................................................................ Power-On Reset Function ....................................................................................................................... Voltage Monitor 0 Reset ......................................................................................................................... Watchdog Timer Reset ............................................................................................................................ Software Reset ......................................................................................................................................... A-1 28 28 28 29 30 31 31 31 33 34 35 35
5.7 5.8 6.
Cold Start-Up/Warm Start-Up Determination Function ......................................................................... 36 Reset Source Determination Function ..................................................................................................... 36 Voltage Detection Circuit .............................................................................................................. 37
6.1 6.2 6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 6.2.6 6.2.7 6.2.8 6.2.9 6.3 6.3.1 6.3.2 6.3.3 6.4 6.5 6.6 7.
Overview ................................................................................................................................................. Registers .................................................................................................................................................. Voltage Monitor Circuit/Comparator A Control Register (CMPA) ................................................... Voltage Monitor Circuit Edge Select Register (VCAC) .................................................................... Voltage Detect Register (VCA1) ........................................................................................................ Voltage Detect Register 2 (VCA2) ..................................................................................................... Voltage Detection 1 Level Select Register (VD1LS) ......................................................................... Voltage Monitor 0 Circuit Control Register (VW0C) ........................................................................ Voltage Monitor 1 Circuit Control Register (VW1C) ........................................................................ Voltage Monitor 2 Circuit Control Register (VW2C) ........................................................................ Option Function Select Register (OFS) .............................................................................................. VCC Input Voltage .................................................................................................................................. Monitoring Vdet0 ............................................................................................................................... Monitoring Vdet1 ............................................................................................................................... Monitoring Vdet2 ............................................................................................................................... Voltage Monitor 0 Reset ......................................................................................................................... Voltage Monitor 1 Interrupt .................................................................................................................... Voltage Monitor 2 Interrupt ....................................................................................................................
37 41 41 42 42 43 44 45 46 47 48 49 49 49 49 50 51 53
I/O Ports ........................................................................................................................................ 55 7.1 7.2 7.3 7.4 7.4.1 7.4.2 7.4.3 7.4.4 7.4.5 7.4.6 7.4.7 7.4.8 7.4.9 7.4.10 7.4.11 7.4.12 7.4.13 7.4.14 7.4.15 7.4.16 7.4.17 7.4.18 7.5 7.6 Functions of I/O Ports ............................................................................................................................. Effect on Peripheral Functions ................................................................................................................ Pins Other than I/O Ports ......................................................................................................................... Registers .................................................................................................................................................. Port Pi Direction Register (PDi) (i = 1, 3, 4) ...................................................................................... Port Pi Register (Pi) (i = 1, 3, 4) ......................................................................................................... Timer RA Pin Select Register (TRASR) ............................................................................................ Timer RC Pin Select Register (TRBRCSR) ....................................................................................... Timer RC Pin Select Register 0 (TRCPSR0) ..................................................................................... Timer RC Pin Select Register 1 (TRCPSR1) ..................................................................................... UART0 Pin Select Register (U0SR) ................................................................................................... UART2 Pin Select Register 0 (U2SR0) .............................................................................................. UART2 Pin Select Register 1 (U2SR1) .............................................................................................. SSU/IIC Pin Select Register (SSUIICSR) .......................................................................................... INT Interrupt Input Pin Select Register (INTSR) ............................................................................... Pull-Up Control Register 0 (PUR0) .................................................................................................... Pull-Up Control Register 1 (PUR1) .................................................................................................... Port P1 Drive Capacity Control Register (P1DRR) ............................................................................ Drive Capacity Control Register 0 (DRR0) ........................................................................................ Drive Capacity Control Register 1 (DRR1) ........................................................................................ Input Threshold Control Register 0 (VLT0) ....................................................................................... Input Threshold Control Register 1 (VLT1) ....................................................................................... Port Settings ............................................................................................................................................ Unassigned Pin Handling ........................................................................................................................ 55 56 56 65 65 66 67 67 68 68 69 70 70 71 71 72 72 73 74 75 76 76 77 86
A-2
8. 9.
Bus ................................................................................................................................................ 87 Clock Generation Circuit ............................................................................................................... 89 9.1 9.2 9.2.1 9.2.2 9.2.3 9.2.4 9.2.5 9.2.6 9.2.7 9.2.8 9.2.9 9.2.10 9.2.11 9.2.12 9.2.13 9.2.14 9.3 9.4 9.4.1 9.4.2 9.5 9.6 9.6.1 9.6.2 9.6.3 9.6.4 9.6.5 9.6.6 9.6.7 9.6.8 9.6.9 9.6.10 9.7 9.7.1 9.7.2 9.7.3 9.8 9.8.1 9.9 9.9.1 9.9.2 9.9.3 9.9.4 Overview ................................................................................................................................................. 89 Registers .................................................................................................................................................. 92 System Clock Control Register 0 (CM0) ............................................................................................ 92 System Clock Control Register 1 (CM1) ............................................................................................ 93 System Clock Control Register 3 (CM3) ............................................................................................ 94 Oscillation Stop Detection Register (OCD) ........................................................................................ 95 High-Speed On-Chip Oscillator Control Register 7 (FRA7) .............................................................. 95 High-Speed On-Chip Oscillator Control Register 0 (FRA0) .............................................................. 96 High-Speed On-Chip Oscillator Control Register 1 (FRA1) .............................................................. 96 High-Speed On-Chip Oscillator Control Register 2 (FRA2) .............................................................. 97 Clock Prescaler Reset Flag (CPSRF) .................................................................................................. 97 High-Speed On-Chip Oscillator Control Register 4 (FRA4) .............................................................. 98 High-Speed On-Chip Oscillator Control Register 5 (FRA5) .............................................................. 98 High-Speed On-Chip Oscillator Control Register 6 (FRA6) .............................................................. 98 High-Speed On-Chip Oscillator Control Register 3 (FRA3) .............................................................. 98 Voltage Detect Register 2 (VCA2) ..................................................................................................... 99 XIN Clock ............................................................................................................................................. 101 On-Chip Oscillator Clock ...................................................................................................................... 102 Low-Speed On-Chip Oscillator Clock .............................................................................................. 102 High-Speed On-Chip Oscillator Clock ............................................................................................. 102 XCIN Clock ........................................................................................................................................... 103 CPU Clock and Peripheral Function Clock ........................................................................................... 104 System Clock .................................................................................................................................... 104 CPU Clock ........................................................................................................................................ 104 Peripheral Function Clock (f1, f2, f4, f8, and f32) ........................................................................... 104 fOCO ................................................................................................................................................. 104 fOCO40M ......................................................................................................................................... 104 fOCO-F ............................................................................................................................................. 104 fOCO-S ............................................................................................................................................. 105 fOCO128 ........................................................................................................................................... 105 fC, fC2, fC4, and fC32 ...................................................................................................................... 105 fOCO-WDT ...................................................................................................................................... 105 Power Control ........................................................................................................................................ 106 Standard Operating Mode ................................................................................................................. 106 Wait Mode ........................................................................................................................................ 108 Stop Mode ......................................................................................................................................... 112 Oscillation Stop Detection Function ..................................................................................................... 115 How to Use Oscillation Stop Detection Function ............................................................................. 116 Notes on Clock Generation Circuit ....................................................................................................... 119 Stop Mode ......................................................................................................................................... 119 Wait Mode ........................................................................................................................................ 119 Oscillation Stop Detection Function ................................................................................................. 119 Oscillation Circuit Constants ............................................................................................................ 119
10. 10.1
Protection .................................................................................................................................... 120 Register .................................................................................................................................................. 120 A-3
10.1.1 11.
Protect Register (PRCR) ................................................................................................................... 120
Interrupts ..................................................................................................................................... 121
11.1 Overview ............................................................................................................................................... 121 11.1.1 Types of Interrupts ............................................................................................................................ 121 11.1.2 Software Interrupts ........................................................................................................................... 122 11.1.3 Special Interrupts .............................................................................................................................. 123 11.1.4 Peripheral Function Interrupts .......................................................................................................... 123 11.1.5 Interrupts and Interrupt Vectors ........................................................................................................ 124 11.2 Registers ................................................................................................................................................ 126 11.2.1 Interrupt Control Register (TREIC, S2TIC, S2RIC, KUPIC, ADIC, S0TIC, S0RIC, TRAIC, TRBIC, U2BCNIC, VCMP1IC, VCMP2IC) ........................................................................................................................................ 126 11.2.2 Interrupt Control Register (FMRDYIC TRCIC, SSUIC/IICIC) ...................................................... 127 11.2.3 INTi Interrupt Control Register (INTiIC) (i = 0, 1, 3) ...................................................................... 128 11.3 Interrupt Control .................................................................................................................................... 129 11.3.1 I Flag ................................................................................................................................................. 129 11.3.2 IR Bit ................................................................................................................................................. 129 11.3.3 Bits ILVL2 to ILVL0, IPL ................................................................................................................ 129 11.3.4 Interrupt Sequence ............................................................................................................................ 130 11.3.5 Interrupt Response Time ................................................................................................................... 131 11.3.6 IPL Change when Interrupt Request is Acknowledged .................................................................... 131 11.3.7 Saving Registers ............................................................................................................................... 132 11.3.8 Returning from Interrupt Routine ..................................................................................................... 134 11.3.9 Interrupt Priority ............................................................................................................................... 134 11.3.10 Interrupt Priority Level Selection Circuit ......................................................................................... 135 11.4 INT Interrupt ......................................................................................................................................... 136 11.4.1 INTi Interrupt (i = 0, 1, 3) ................................................................................................................. 136 11.4.2 INT Interrupt Input Pin Select Register (INTSR) ............................................................................. 136 11.4.3 External Input Enable Register 0 (INTEN) ...................................................................................... 137 11.4.4 INT Input Filter Select Register 0 (INTF) ........................................................................................ 137 11.4.5 INTi Input Filter (i = 0, 1, 3) ............................................................................................................. 138 11.5 Key Input Interrupt ................................................................................................................................ 139 11.5.1 Key Input Enable Register 0 (KIEN) ................................................................................................ 140 11.6 Address Match Interrupt ........................................................................................................................ 141 11.6.1 Address Match Interrupt Enable Register i (AIERi) (i = 0 or 1) ...................................................... 142 11.6.2 Address Match Interrupt Register i (RMADi) (i = 0 or 1) ................................................................ 142 11.7 Timer RC Interrupt, Synchronous Serial Communication Unit Interrupt, I2C bus Interface Interrupt, and Flash Memory Interrupt (Interrupts with Multiple Interrupt Request Sources) .................................... 143 11.8 Notes on Interrupts ................................................................................................................................ 145 11.8.1 Reading Address 00000h .................................................................................................................. 145 11.8.2 SP Setting .......................................................................................................................................... 145 11.8.3 External Interrupt and Key Input Interrupt ....................................................................................... 145 11.8.4 Changing Interrupt Sources .............................................................................................................. 146 11.8.5 Rewriting Interrupt Control Register ................................................................................................ 147 12. 12.1 12.2 ID Code Areas ............................................................................................................................ 148 Overview ............................................................................................................................................... 148 Functions ............................................................................................................................................... 149 A-4
12.3 Forced Erase Function ........................................................................................................................... 12.4 Standard Serial II/O Mode Disabled Function ...................................................................................... 12.5 Notes on ID Code Areas ........................................................................................................................ 12.5.1 Setting Example of ID Code Areas ................................................................................................... 13.
150 150 151 151
Option Function Select Area ....................................................................................................... 152
13.1 Overview ............................................................................................................................................... 152 13.2 Registers ................................................................................................................................................ 153 13.2.1 Option Function Select Register (OFS) ............................................................................................ 153 13.2.2 Option Function Select Register 2 (OFS2) ....................................................................................... 154 13.3 Notes on Option Function Select Area .................................................................................................. 155 13.3.1 Setting Example of Option Function Select Area ............................................................................. 155 14. Watchdog Timer .......................................................................................................................... 156
14.1 Overview ............................................................................................................................................... 156 14.2 Registers ................................................................................................................................................ 158 14.2.1 Processor Mode Register 1 (PM1) .................................................................................................... 158 14.2.2 Watchdog Timer Reset Register (WDTR) ........................................................................................ 158 14.2.3 Watchdog Timer Start Register (WDTS) ......................................................................................... 158 14.2.4 Watchdog Timer Control Register (WDTC) .................................................................................... 159 14.2.5 Count Source Protection Mode Register (CSPR) ............................................................................. 159 14.2.6 Option Function Select Register (OFS) ............................................................................................ 160 14.2.7 Option Function Select Register 2 (OFS2) ....................................................................................... 161 14.3 Functional Description ......................................................................................................................... 162 14.3.1 Common Items for Multiple Modes ................................................................................................. 162 14.3.2 Count Source Protection Mode Disabled .......................................................................................... 163 14.3.3 Count Source Protection Mode Enabled ........................................................................................... 164 15. DTC ............................................................................................................................................ 165
15.1 Overview ............................................................................................................................................... 165 15.2 Registers ................................................................................................................................................ 166 15.2.1 DTC Control Register (DTCCR) ...................................................................................................... 167 15.2.2 DTC Block Size Register (DTBLS) ................................................................................................. 167 15.2.3 DTC Transfer Count Register (DTCCT) .......................................................................................... 168 15.2.4 DTC Transfer Count Reload Register (DTRLD) ............................................................................. 168 15.2.5 DTC Source Address Register (DTSAR) ......................................................................................... 168 15.2.6 DTC Destination Register (DTDAR) ............................................................................................... 168 15.2.7 DTC Activation Enable Registers (DTCENi) (i = 0 to 3, 5, 6) ........................................................ 169 15.2.8 DTC Activation Control Register (DTCTL) .................................................................................... 170 15.3 Function Description ............................................................................................................................. 171 15.3.1 Overview ........................................................................................................................................... 171 15.3.2 Activation Sources ............................................................................................................................ 171 15.3.3 Control Data Allocation and DTC Vector Table .............................................................................. 173 15.3.4 Normal Mode .................................................................................................................................... 176 15.3.5 Repeat Mode ..................................................................................................................................... 177 15.3.6 Chain Transfers ................................................................................................................................. 178 15.3.7 Interrupt Sources ............................................................................................................................... 178 15.3.8 Operation Timings ............................................................................................................................ 179 15.3.9 Number of DTC Execution Cycles ................................................................................................... 180 A-5
15.4 Notes on DTC ........................................................................................................................................ 15.4.1 DTC activation source ...................................................................................................................... 15.4.2 DTCENi Registers (i = 0 to 3, 5, 6) .................................................................................................. 15.4.3 Peripheral Modules ........................................................................................................................... 16. 17.
181 181 181 181
General Overview of Timers ....................................................................................................... 182 Timer RA ..................................................................................................................................... 184 Overview ............................................................................................................................................... Registers ................................................................................................................................................ Timer RA Control Register (TRACR) .............................................................................................. Timer RA I/O Control Register (TRAIOC) ...................................................................................... Timer RA Mode Register (TRAMR) ................................................................................................ Timer RA Prescaler Register (TRAPRE) ......................................................................................... Timer RA Register (TRA) ................................................................................................................ Timer RA Pin Select Register (TRASR) .......................................................................................... Timer Mode ........................................................................................................................................... Timer RA I/O Control Register (TRAIOC) in Timer Mode ............................................................ Timer Write Control during Count Operation .................................................................................. Pulse Output Mode ................................................................................................................................ Timer RA I/O Control Register (TRAIOC) in Pulse Output Mode ................................................. Event Counter Mode ............................................................................................................................. Timer RA I/O Control Register (TRAIOC) in Event Counter Mode ............................................... Pulse Width Measurement Mode .......................................................................................................... Timer RA I/O Control Register (TRAIOC) in Pulse Width Measurement Mode ............................ Operating Example ........................................................................................................................... Pulse Period Measurement Mode .......................................................................................................... Timer RA I/O Control Register (TRAIOC) in Pulse Period Measurement Mode ........................... Operating Example ........................................................................................................................... Notes on Timer RA ............................................................................................................................... 184 185 185 185 186 186 187 187 188 188 189 190 191 192 193 194 195 196 197 198 199 200
17.1 17.2 17.2.1 17.2.2 17.2.3 17.2.4 17.2.5 17.2.6 17.3 17.3.1 17.3.2 17.4 17.4.1 17.5 17.5.1 17.6 17.6.1 17.6.2 17.7 17.7.1 17.7.2 17.8 18.
Timer RB ..................................................................................................................................... 201 Overview ............................................................................................................................................... Registers ................................................................................................................................................ Timer RB Control Register (TRBCR) .............................................................................................. Timer RB One-Shot Control Register (TRBOCR) ........................................................................... Timer RB I/O Control Register (TRBIOC) ...................................................................................... Timer RB Mode Register (TRBMR) ................................................................................................ Timer RB Prescaler Register (TRBPRE) .......................................................................................... Timer RB Secondary Register (TRBSC) .......................................................................................... Timer RB Primary Register (TRBPR) .............................................................................................. Timer Mode ........................................................................................................................................... Timer RB I/O Control Register (TRBIOC) in Timer Mode ............................................................. Timer Write Control during Count Operation .................................................................................. Programmable Waveform Generation Mode ........................................................................................ Timer RB I/O Control Register (TRBIOC) in Programmable Waveform Generation Mode .......... Operating Example ........................................................................................................................... Programmable One-shot Generation Mode ........................................................................................... Timer RB I/O Control Register (TRBIOC) in Programmable One-Shot Generation Mode ............ A-6 201 202 202 202 203 203 204 204 205 206 206 207 209 210 211 212 213
18.1 18.2 18.2.1 18.2.2 18.2.3 18.2.4 18.2.5 18.2.6 18.2.7 18.3 18.3.1 18.3.2 18.4 18.4.1 18.4.2 18.5 18.5.1
18.5.2 Operating Example ........................................................................................................................... 18.5.3 One-Shot Trigger Selection .............................................................................................................. 18.6 Programmable Wait One-Shot Generation Mode ................................................................................. 18.6.1 Timer RB I/O Control Register (TRBIOC) in Programmable Wait One-Shot Generation Mode ... 18.6.2 Operating Example ........................................................................................................................... 18.7 Notes on Timer RB ................................................................................................................................ 18.7.1 Timer Mode ...................................................................................................................................... 18.7.2 Programmable Waveform Generation Mode .................................................................................... 18.7.3 Programmable One-shot Generation Mode ...................................................................................... 18.7.4 Programmable Wait One-shot Generation Mode ............................................................................. 19.
214 215 216 217 218 219 219 219 220 220
Timer RC ..................................................................................................................................... 221 221 223 224 224 225 225 226 227 227 228 228 229 229 230 230 231 232 232 233 233 234 236 237 239 241 242 243 244 246 247 248 249 250 252 254 254 256
19.1 Overview ............................................................................................................................................... 19.2 Registers ................................................................................................................................................ 19.2.1 Module Standby Control Register (MSTCR) ................................................................................... 19.2.2 Timer RC Mode Register (TRCMR) ................................................................................................ 19.2.3 Timer RC Control Register 1 (TRCCR1) ......................................................................................... 19.2.4 Timer RC Interrupt Enable Register (TRCIER) ............................................................................... 19.2.5 Timer RC Status Register (TRCSR) ................................................................................................. 19.2.6 Timer RC I/O Control Register 0 (TRCIOR0) ................................................................................. 19.2.7 Timer RC I/O Control Register 1 (TRCIOR1) ................................................................................. 19.2.8 Timer RC Counter (TRC) ................................................................................................................. 19.2.9 Timer RC General Registers A, B, C, and D (TRCGRA, TRCGRB, TRCGRC, TRCGRD) .......... 19.2.10 Timer RC Control Register 2 (TRCCR2) ......................................................................................... 19.2.11 Timer RC Digital Filter Function Select Register (TRCDF) ............................................................ 19.2.12 Timer RC Output Master Enable Register (TRCOER) .................................................................... 19.2.13 Timer RC Trigger Control Register (TRCADCR) ........................................................................... 19.2.14 Timer RC Pin Select Register (TRBRCSR) ..................................................................................... 19.2.15 Timer RC Pin Select Register 0 (TRCPSR0) ................................................................................... 19.2.16 Timer RC Pin Select Register 1 (TRCPSR1) ................................................................................... 19.3 Common Items for Multiple Modes ...................................................................................................... 19.3.1 Count Source ..................................................................................................................................... 19.3.2 Buffer Operation ............................................................................................................................... 19.3.3 Digital Filter ...................................................................................................................................... 19.3.4 Forced Cutoff of Pulse Output .......................................................................................................... 19.4 Timer Mode (Input Capture Function) .................................................................................................. 19.4.1 Timer RC I/O Control Register 0 (TRCIOR0) for Input Capture Function ..................................... 19.4.2 Timer RC I/O Control Register 1 (TRCIOR1) for Input Capture Function ..................................... 19.4.3 Operating Example ........................................................................................................................... 19.5 Timer Mode (Output Compare Function) ............................................................................................. 19.5.1 Timer RC Control Register 1 (TRCCR1) for Output Compare Function ........................................ 19.5.2 Timer RC I/O Control Register 0 (TRCIOR0) for Output Compare Function ................................ 19.5.3 Timer RC I/O Control Register 1 (TRCIOR1) for Output Compare Function ................................ 19.5.4 Operating Example ........................................................................................................................... 19.5.5 Changing Output Pins in Registers TRCGRC and TRCGRD .......................................................... 19.6 PWM Mode ........................................................................................................................................... 19.6.1 Timer RC Control Register 1 (TRCCR1) in PWM Mode ................................................................ 19.6.2 Timer RC Control Register 2 (TRCCR2) ......................................................................................... 19.6.3 Operating Example ........................................................................................................................... A-7
19.7 PWM2 Mode ......................................................................................................................................... 258 19.7.1 Timer RC Control Register 1 (TRCCR1) in PWM2 Mode .............................................................. 260 19.7.2 Timer RC Control Register 2 (TRCCR2) in PWM2 Mode .............................................................. 261 19.7.3 Timer RC Digital Filter Function Select Register (TRCDF) in PWM2 Mode ................................. 261 19.7.4 Operating Example ........................................................................................................................... 263 19.8 Timer RC Interrupt ................................................................................................................................ 266 19.9 Notes on Timer RC ................................................................................................................................ 267 19.9.1 TRC Register .................................................................................................................................... 267 19.9.2 TRCSR Register .............................................................................................................................. 267 19.9.3 TRCCR1 Register ............................................................................................................................. 267 19.9.4 Count Source Switching ................................................................................................................... 267 19.9.5 Input Capture Function ..................................................................................................................... 268 19.9.6 TRCMR Register in PWM2 Mode ................................................................................................... 268 19.9.7 Count Source fOCO40M .................................................................................................................. 268 20. Timer RE ..................................................................................................................................... 269 Overview ............................................................................................................................................... Real-Time Clock Mode ......................................................................................................................... Timer RE Second Data Register (TRESEC) in Real-Time Clock Mode ......................................... Timer RE Minute Data Register (TREMIN) in Real-Time Clock Mode ......................................... Timer RE Hour Data Register (TREHR) in Real-Time Clock Mode ............................................... Timer RE Day of Week Data Register (TREWK) in Real-Time Clock Mode ................................ Timer RE Control Register 1 (TRECR1) in Real-Time Clock Mode .............................................. Timer RE Control Register 2 (TRECR2) in Real-Time Clock Mode .............................................. Timer RE Count Source Select Register (TRECSR) in Real-Time Clock Mode ............................. Operating Example ........................................................................................................................... Output Compare Mode .......................................................................................................................... Timer RE Counter Data Register (TRESEC) in Output Compare Mode ......................................... Timer RE Compare Data Register (TREMIN) in Output Compare Mode ....................................... Timer RE Control Register 1 (TRECR1) in Output Compare Mode ............................................... Timer RE Control Register 2 (TRECR2) in Output Compare Mode ............................................... Timer RE Count Source Select Register (TRECSR) in Output Compare Mode .............................. Operating Example ........................................................................................................................... Notes on Timer RE ................................................................................................................................ Starting and Stopping Count ............................................................................................................. Register Setting ................................................................................................................................. Time Reading Procedure of Real-Time Clock Mode ....................................................................... 269 270 272 272 273 273 274 275 276 277 278 280 280 281 281 282 283 284 284 284 286
20.1 20.2 20.2.1 20.2.2 20.2.3 20.2.4 20.2.5 20.2.6 20.2.7 20.2.8 20.3 20.3.1 20.3.2 20.3.3 20.3.4 20.3.5 20.3.6 20.4 20.4.1 20.4.2 20.4.3 21.
Serial Interface (UART0) ............................................................................................................ 287
21.1 Overview ............................................................................................................................................... 287 21.2 Registers ................................................................................................................................................ 289 21.2.1 UART0 Transmit/Receive Mode Register (U0MR) ......................................................................... 289 21.2.2 UART0 Bit Rate Register (U0BRG) ................................................................................................ 289 21.2.3 UART0 Transmit Buffer Register (U0TB) ....................................................................................... 290 21.2.4 UART0 Transmit/Receive Control Register 0 (U0C0) .................................................................... 291 21.2.5 UART0 Transmit/Receive Control Register 1 (U0C1) .................................................................... 291 21.2.6 UART0 Receive Buffer Register (U0RB) ........................................................................................ 292 21.2.7 UART0 Pin Select Register (U0SR) ................................................................................................. 293 21.3 Clock Synchronous Serial I/O Mode ..................................................................................................... 294 A-8
21.3.1 Polarity Select Function .................................................................................................................... 21.3.2 LSB First/MSB First Select Function ............................................................................................... 21.3.3 Continuous Receive Mode ................................................................................................................ 21.4 Clock Asynchronous Serial I/O (UART) Mode .................................................................................... 21.4.1 Bit Rate ............................................................................................................................................. 21.5 Notes on Serial Interface (UART0) ....................................................................................................... 22.
298 298 299 300 305 306
Serial Interface (UART2) ............................................................................................................ 307 307 309 309 309 310 311 312 313 314 314 315 315 316 316 317 317 318 322 322 323 323 324 324 325 329 330 330 331 331 332 332 333 339 340 341 341 341 342 342 342 343
22.1 Overview ............................................................................................................................................... 22.2 Registers ................................................................................................................................................ 22.2.1 UART2 Transmit/Receive Mode Register (U2MR) ......................................................................... 22.2.2 UART2 Bit Rate Register (U2BRG) ................................................................................................ 22.2.3 UART2 Transmit Buffer Register (U2TB) ....................................................................................... 22.2.4 UART2 Transmit/Receive Control Register 0 (U2C0) .................................................................... 22.2.5 UART2 Transmit/Receive Control Register 1 (U2C1) .................................................................... 22.2.6 UART2 Receive Buffer Register (U2RB) ........................................................................................ 22.2.7 UART2 Digital Filter Function Select Register (URXDF) .............................................................. 22.2.8 UART2 Special Mode Register 5 (U2SMR5) .................................................................................. 22.2.9 UART2 Special Mode Register 4 (U2SMR4) .................................................................................. 22.2.10 UART2 Special Mode Register 3 (U2SMR3) .................................................................................. 22.2.11 UART2 Special Mode Register 2 (U2SMR2) .................................................................................. 22.2.12 UART2 Special Mode Register (U2SMR) ....................................................................................... 22.2.13 UART2 Pin Select Register 0 (U2SR0) ............................................................................................ 22.2.14 UART2 Pin Select Register 1 (U2SR1) ............................................................................................ 22.3 Clock Synchronous Serial I/O Mode ..................................................................................................... 22.3.1 Measure for Dealing with Communication Errors ........................................................................... 22.3.2 CLK Polarity Select Function ........................................................................................................... 22.3.3 LSB First/MSB First Select Function ............................................................................................... 22.3.4 Continuous Receive Mode ................................................................................................................ 22.3.5 Serial Data Logic Switching Function .............................................................................................. 22.3.6 CTS/RTS Function ............................................................................................................................ 22.4 Clock Asynchronous Serial I/O (UART) Mode .................................................................................... 22.4.1 Bit Rate ............................................................................................................................................. 22.4.2 Measure for Dealing with Communication Errors ........................................................................... 22.4.3 LSB First/MSB First Select Function ............................................................................................... 22.4.4 Serial Data Logic Switching Function .............................................................................................. 22.4.5 TXD and RXD I/O Polarity Inverse Function .................................................................................. 22.4.6 CTS/RTS Function ............................................................................................................................ 22.4.7 RXD2 Digital Filter Select Function ................................................................................................ 22.5 Special Mode 1 (I2C Mode) .................................................................................................................. 22.5.1 Detection of Start and Stop Conditions ............................................................................................ 22.5.2 Output of Start and Stop Conditions ................................................................................................. 22.5.3 Arbitration ......................................................................................................................................... 22.5.4 Transfer Clock .................................................................................................................................. 22.5.5 SDA Output ...................................................................................................................................... 22.5.6 SDA Input ......................................................................................................................................... 22.5.7 ACK and NACK ............................................................................................................................... 22.5.8 Initialization of Transmission/Reception .......................................................................................... 22.6 Multiprocessor Communication Function ............................................................................................. A-9
22.6.1 Multiprocessor Transmission ............................................................................................................ 22.6.2 Multiprocessor Reception ................................................................................................................. 22.6.3 RXD2 Digital Filter Select Function ................................................................................................ 22.7 Notes on Serial Interface (UART2) ....................................................................................................... 22.7.1 Clock Synchronous Serial I/O Mode ................................................................................................ 22.7.2 Clock Asynchronous Serial I/O (UART) Mode ............................................................................... 22.7.3 Special Mode 1 (I2C Mode) .............................................................................................................. 23. 23.1 24.
346 347 349 350 350 351 351
Clock Synchronous Serial Interface ............................................................................................ 352 Mode Selection ...................................................................................................................................... 352 Synchronous Serial Communication Unit (SSU) ........................................................................ 353 353 355 355 355 356 356 357 357 358 359 360 361 362 363 363 365 366 367 368 368 369 371 375 376 377 379 381 382
24.1 Overview ............................................................................................................................................... 24.2 Registers ................................................................................................................................................ 24.2.1 Module Standby Control Register (MSTCR) ................................................................................... 24.2.2 SSU/IIC Pin Select Register (SSUIICSR) ........................................................................................ 24.2.3 SS Bit Counter Register (SSBR) ...................................................................................................... 24.2.4 SS Transmit Data Register (SSTDR) ................................................................................................ 24.2.5 SS Receive Data Register (SSRDR) ................................................................................................. 24.2.6 SS Control Register H (SSCRH) ...................................................................................................... 24.2.7 SS Control Register L (SSCRL) ....................................................................................................... 24.2.8 SS Mode Register (SSMR) ............................................................................................................... 24.2.9 SS Enable Register (SSER) .............................................................................................................. 24.2.10 SS Status Register (SSSR) ................................................................................................................ 24.2.11 SS Mode Register 2 (SSMR2) .......................................................................................................... 24.3 Common Items for Multiple Modes ...................................................................................................... 24.3.1 Transfer Clock .................................................................................................................................. 24.3.2 SS Shift Register (SSTRSR) ............................................................................................................. 24.3.3 Interrupt Requests ............................................................................................................................. 24.3.4 Communication Modes and Pin Functions ....................................................................................... 24.4 Clock Synchronous Communication Mode .......................................................................................... 24.4.1 Initialization in Clock Synchronous Communication Mode ............................................................ 24.4.2 Data Transmission ............................................................................................................................ 24.4.3 Data Reception .................................................................................................................................. 24.5 Operation in 4-Wire Bus Communication Mode .................................................................................. 24.5.1 Initialization in 4-Wire Bus Communication Mode ......................................................................... 24.5.2 Data Transmission ............................................................................................................................ 24.5.3 Data Reception .................................................................................................................................. 24.5.4 SCS Pin Control and Arbitration ...................................................................................................... 24.6 Notes on Synchronous Serial Communication Unit .............................................................................. 25.
I2C bus Interface ......................................................................................................................... 383
25.1 Overview ............................................................................................................................................... 383 25.2 Registers ................................................................................................................................................ 386 25.2.1 Module Standby Control Register (MSTCR) ................................................................................... 386 25.2.2 SSU/IIC Pin Select Register (SSUIICSR) ........................................................................................ 386 25.2.3 IIC bus Transmit Data Register (ICDRT) ......................................................................................... 387 25.2.4 IIC bus Receive Data Register (ICDRR) .......................................................................................... 387 25.2.5 IIC bus Control Register 1 (ICCR1) ................................................................................................. 388 A - 10
25.2.6 IIC bus Control Register 2 (ICCR2) ................................................................................................. 25.2.7 IIC bus Mode Register (ICMR) ........................................................................................................ 25.2.8 IIC bus Interrupt Enable Register (ICIER) ....................................................................................... 25.2.9 IIC bus Status Register (ICSR) ......................................................................................................... 25.2.10 Slave Address Register (SAR) .......................................................................................................... 25.2.11 IIC bus Shift Register (ICDRS) ........................................................................................................ 25.3 Common Items for Multiple Modes ...................................................................................................... 25.3.1 Transfer Clock .................................................................................................................................. 25.3.2 Interrupt Requests ............................................................................................................................. 25.4 I2C bus Interface Mode ......................................................................................................................... 25.4.1 I2C bus Format ................................................................................................................................. 25.4.2 Master Transmit Operation ............................................................................................................... 25.4.3 Master Receive Operation ................................................................................................................ 25.4.4 Slave Transmit Operation ................................................................................................................. 25.4.5 Slave Receive Operation ................................................................................................................... 25.5 Clock Synchronous Serial Mode ........................................................................................................... 25.5.1 Clock Synchronous Serial Format .................................................................................................... 25.5.2 Transmit Operation ........................................................................................................................... 25.5.3 Receive Operation ............................................................................................................................. 25.6 Examples of Register Setting ................................................................................................................ 25.7 Noise Canceller ..................................................................................................................................... 25.8 Bit Synchronization Circuit ................................................................................................................... 25.9 Notes on I2C bus Interface .................................................................................................................... 26.
389 390 391 392 393 393 394 394 395 396 396 397 399 402 405 407 407 408 409 410 414 415 416
Hardware LIN .............................................................................................................................. 417 Overview ............................................................................................................................................... Input/Output Pins .................................................................................................................................. Registers ................................................................................................................................................ LIN Control Register 2 (LINCR2) .................................................................................................... LIN Control Register (LINCR) ......................................................................................................... LIN Status Register (LINST) ............................................................................................................ Function Description ............................................................................................................................. Master Mode ..................................................................................................................................... Slave Mode ....................................................................................................................................... Bus Collision Detection Function ..................................................................................................... Hardware LIN End Processing ......................................................................................................... Interrupt Requests .................................................................................................................................. Notes on Hardware LIN ........................................................................................................................ 417 418 419 419 420 420 421 421 424 428 429 430 431
26.1 26.2 26.3 26.3.1 26.3.2 26.3.3 26.4 26.4.1 26.4.2 26.4.3 26.4.4 26.5 26.6 27.
A/D Converter ............................................................................................................................. 432
27.1 Overview ............................................................................................................................................... 432 27.2 Registers ................................................................................................................................................ 434 27.2.1 On-Chip Reference Voltage Control Register (OCVREFCR) ......................................................... 434 27.2.2 A/D Register i (ADi) (i = 0 to 7) ...................................................................................................... 435 27.2.3 A/D Mode Register (ADMOD) ........................................................................................................ 436 27.2.4 A/D Input Select Register (ADINSEL) ............................................................................................ 437 27.2.5 A/D Control Register 0 (ADCON0) ................................................................................................. 438 27.2.6 A/D Control Register 1 (ADCON1) ................................................................................................. 439 27.3 Common Items for Multiple Modes ...................................................................................................... 440 A - 11
27.3.1 27.3.2 27.3.3 27.3.4 27.3.5 27.3.6 27.3.7 27.4 27.5 27.6 27.7 27.8 27.9 27.10 27.11 28.
Input/Output Pins .............................................................................................................................. A/D Conversion Cycles .................................................................................................................... A/D Conversion Start Condition ....................................................................................................... A/D Conversion Result ..................................................................................................................... Low Current Consumption Function ................................................................................................ Extended Analog Input Pins ............................................................................................................. A/D Open-Circuit Detection Assist Function ................................................................................... One-Shot Mode ..................................................................................................................................... Repeat Mode 0 ....................................................................................................................................... Repeat Mode 1 ....................................................................................................................................... Single Sweep Mode ............................................................................................................................... Repeat Sweep Mode .............................................................................................................................. Internal Equivalent Circuit of Analog Input .......................................................................................... Output Impedance of Sensor under A/D Conversion ............................................................................ Notes on A/D Converter ........................................................................................................................
440 440 442 443 443 443 443 445 446 447 449 451 453 454 455
Comparator A ............................................................................................................................. 456 Overview ............................................................................................................................................... Registers ................................................................................................................................................ Voltage Monitor Circuit/Comparator A Control Register (CMPA) ................................................. Voltage Monitor Circuit Edge Select Register (VCAC) .................................................................. Voltage Detect Register (VCA1) ...................................................................................................... Voltage Detect Register 2 (VCA2) ................................................................................................... Voltage Monitor 1 Circuit Control Register (VW1C) ...................................................................... Voltage Monitor 2 Circuit Control Register (VW2C) ...................................................................... Monitoring Comparison Results ........................................................................................................... Monitoring Comparator A1 .............................................................................................................. Monitoring Comparator A2 .............................................................................................................. Functional Description .......................................................................................................................... Comparator A1 ................................................................................................................................. Comparator A2 ................................................................................................................................. Comparator A1 and Comparator A2 Interrupts ..................................................................................... Non-Maskable Interrupts .................................................................................................................. Maskable Interrupts .......................................................................................................................... 456 458 458 458 459 460 461 462 463 463 463 464 464 467 470 470 470
28.1 28.2 28.2.1 28.2.2 28.2.3 28.2.4 28.2.5 28.2.6 28.3 28.3.1 28.3.2 28.4 28.4.1 28.4.2 28.5 28.5.1 28.5.2 29.
Comparator B ............................................................................................................................. 471 Overview ............................................................................................................................................... Registers ................................................................................................................................................ Comparator B Control Register (INTCMP) ..................................................................................... External Input Enable Register 0 (INTEN) ...................................................................................... INT Input Filter Select Register 0 (INTF) ........................................................................................ Functional Description .......................................................................................................................... Comparator Bi Digital Filter (i = 1 or 3) .......................................................................................... Comparator B1 and Comparator B3 Interrupts ..................................................................................... 471 473 473 473 474 475 476 477
29.1 29.2 29.2.1 29.2.2 29.2.3 29.3 29.3.1 29.4 30. 30.1 30.2 30.3
Flash Memory ............................................................................................................................. 478 Overview ............................................................................................................................................... 478 Memory Map ......................................................................................................................................... 479 Functions to Prevent Flash Memory from being Rewritten .................................................................. 480 A - 12
30.3.1 ID Code Check Function .................................................................................................................. 30.3.2 ROM Code Protect Function ............................................................................................................ 30.3.3 Option Function Select Register (OFS) ............................................................................................ 30.4 CPU Rewrite Mode ............................................................................................................................... 30.4.1 Flash Memory Status Register (FST) ............................................................................................... 30.4.2 Flash Memory Control Register 0 (FMR0) ...................................................................................... 30.4.3 Flash Memory Control Register 1 (FMR1) ...................................................................................... 30.4.4 Flash Memory Control Register 2 (FMR2) ...................................................................................... 30.4.5 EW0 Mode ........................................................................................................................................ 30.4.6 EW1 Mode ........................................................................................................................................ 30.4.7 Suspend Operation ............................................................................................................................ 30.4.8 How to Set and Exit Each Mode ....................................................................................................... 30.4.9 BGO (BackGround Operation) Function .......................................................................................... 30.4.10 Data Protect Function ....................................................................................................................... 30.4.11 Software Commands ......................................................................................................................... 30.4.12 Status Register .................................................................................................................................. 30.4.13 Sequence Status ................................................................................................................................ 30.4.14 Erase Status ....................................................................................................................................... 30.4.15 Program Status .................................................................................................................................. 30.4.16 Suspend Status .................................................................................................................................. 30.4.17 Full Status Check .............................................................................................................................. 30.5 Standard Serial I/O Mode ...................................................................................................................... 30.5.1 ID Code Check Function .................................................................................................................. 30.6 Parallel I/O Mode .................................................................................................................................. 30.6.1 ROM Code Protect Function ............................................................................................................ 30.7 Notes on Flash Memory ........................................................................................................................ 30.7.1 CPU Rewrite Mode ........................................................................................................................... 31.
480 481 481 482 483 485 487 489 490 490 490 491 492 493 494 504 504 504 504 504 505 507 507 510 510 511 511
Reducing Power Consumption ................................................................................................... 514 514 514 514 514 514 514 514 514 514 514 515 516 517 517
31.1 Overview ............................................................................................................................................... 31.2 Key Points and Processing Methods for Reducing Power Consumption ............................................. 31.2.1 Voltage Detection Circuit ................................................................................................................. 31.2.2 Ports .................................................................................................................................................. 31.2.3 Clocks ............................................................................................................................................... 31.2.4 Wait Mode, Stop Mode ..................................................................................................................... 31.2.5 Stopping Peripheral Function Clocks ............................................................................................... 31.2.6 Timers ............................................................................................................................................... 31.2.7 A/D Converter ................................................................................................................................... 31.2.8 Clock Synchronous Serial Interface ................................................................................................. 31.2.9 Reducing Internal Power Consumption ............................................................................................ 31.2.10 Stopping Flash Memory .................................................................................................................... 31.2.11 Low-Current-Consumption Read Mode ........................................................................................... 31.2.12 Others ................................................................................................................................................ 32. 33.
Electrical Characteristics ............................................................................................................ 518 Usage Notes ............................................................................................................................... 545
33.1 Notes on Clock Generation Circuit ....................................................................................................... 545 33.1.1 Stop Mode ......................................................................................................................................... 545 A - 13
33.1.2 Wait Mode ........................................................................................................................................ 545 33.1.3 Oscillation Stop Detection Function ................................................................................................. 545 33.1.4 Oscillation Circuit Constants ............................................................................................................ 545 33.2 Notes on Interrupts ................................................................................................................................ 546 33.2.1 Reading Address 00000h .................................................................................................................. 546 33.2.2 SP Setting .......................................................................................................................................... 546 33.2.3 External Interrupt and Key Input Interrupt ....................................................................................... 546 33.2.4 Changing Interrupt Sources .............................................................................................................. 547 33.2.5 Rewriting Interrupt Control Register ................................................................................................ 548 33.3 Notes on ID Code Areas ........................................................................................................................ 549 33.3.1 Setting Example of ID Code Areas ................................................................................................... 549 33.4 Notes on Option Function Select Area .................................................................................................. 549 33.4.1 Setting Example of Option Function Select Area ............................................................................. 549 33.5 Notes on DTC ........................................................................................................................................ 550 33.5.1 DTC activation source ...................................................................................................................... 550 33.5.2 DTCENi Registers (i = 0 to 3, 5, 6) .................................................................................................. 550 33.5.3 Peripheral Modules ........................................................................................................................... 550 33.6 Notes on Timer RA ............................................................................................................................... 551 33.7 Notes on Timer RB ................................................................................................................................ 552 33.7.1 Timer Mode ...................................................................................................................................... 552 33.7.2 Programmable Waveform Generation Mode .................................................................................... 552 33.7.3 Programmable One-shot Generation Mode ...................................................................................... 552 33.7.4 Programmable Wait One-shot Generation Mode ............................................................................. 553 33.8 Notes on Timer RC ................................................................................................................................ 554 33.8.1 TRC Register .................................................................................................................................... 554 33.8.2 TRCSR Register .............................................................................................................................. 554 33.8.3 TRCCR1 Register ............................................................................................................................. 554 33.8.4 Count Source Switching ................................................................................................................... 554 33.8.5 Input Capture Function ..................................................................................................................... 555 33.8.6 TRCMR Register in PWM2 Mode ................................................................................................... 555 33.8.7 Count Source fOCO40M .................................................................................................................. 555 33.9 Notes on Timer RE ................................................................................................................................ 556 33.9.1 Starting and Stopping Count ............................................................................................................. 556 33.9.2 Register Setting ................................................................................................................................. 556 33.9.3 Time Reading Procedure of Real-Time Clock Mode ....................................................................... 558 33.10 Notes on Serial Interface (UART0) ....................................................................................................... 559 33.11 Notes on Serial Interface (UART2) ....................................................................................................... 560 33.11.1 Clock Synchronous Serial I/O Mode ................................................................................................ 560 33.11.2 Clock Asynchronous Serial I/O (UART) Mode ............................................................................... 561 33.11.3 Special Mode 1 (I2C Mode) .............................................................................................................. 561 33.12 Notes on Synchronous Serial Communication Unit .............................................................................. 562 33.13 Notes on I2C bus Interface .................................................................................................................... 562 33.14 Notes on Hardware LIN ........................................................................................................................ 562 33.15 Notes on A/D Converter ........................................................................................................................ 562 33.16 Notes on Flash Memory ........................................................................................................................ 563 33.16.1 CPU Rewrite Mode ........................................................................................................................... 563 33.17 Notes on Noise ...................................................................................................................................... 566 33.17.1 Inserting a Bypass Capacitor between VCC and VSS Pins as a Countermeasure against Noise and Latch-up ............................................................................................................................................ 566 A - 14
33.17.2 Countermeasures against Noise Error of Port Control Registers ..................................................... 566 34. Notes on On-Chip Debugger ...................................................................................................... 567
Appendix 1. Package Dimensions ........................................................................................................ 568 Appendix 2. Connection Examples between Serial Writer and On-Chip Debugging Emulator ............ 569 Appendix 3. Example of Oscillation Evaluation Circuit ......................................................................... 570 Index ..................................................................................................................................................... 571
A - 15
SFR Page Reference
Address 0000h 0001h 0002h 0003h 0004h 0005h 0006h 0007h 0008h 0009h 000Ah 000Bh 000Ch 000Dh 000Eh 000Fh 0010h 0011h 0012h 0013h 0014h 0015h 0016h 0017h 0018h 0019h 001Ah 001Bh 001Ch 001Dh 001Eh 001Fh 0020h 0021h 0022h 0023h 0024h 0025h 0026h 0027h 0028h 0029h 002Ah 002Bh 002Ch 002Dh 002Eh 002Fh 0030h 0031h 0032h 0033h 0034h 0035h 0036h 0037h 0038h 0039h 003Ah 003Bh 003Ch 003Dh 003Eh 003Fh Register Symbol Page Address Register 0040h 0041h Flash Memory Ready Interrupt Control Register 0042h 0043h 0044h 0045h 0046h 0047h Timer RC Interrupt Control Register 0048h 0049h 004Ah Timer RE Interrupt Control Register 004Bh UART2 Transmit Interrupt Control Register 004Ch UART2 Receive Interrupt Control Register 004Dh Key Input Interrupt Control Register 004Eh A/D Conversion Interrupt Control Register 004Fh SSU Interrupt Control Register / IIC bus Interrupt Control Register 0050h 0051h UART0 Transmit Interrupt Control Register 0052h UART0 Receive Interrupt Control Register 0053h 0054h 0055h 0056h Timer RA Interrupt Control Register 0057h 0058h 0059h 005Ah 005Bh 005Ch 005Dh 005Eh 005Fh 0060h 0061h 0062h 0063h 0064h 0065h 0066h 0067h 0068h 0069h 006Ah 006Bh 006Ch 006Dh 006Eh 006Fh 0070h 0071h 0072h 0073h 0074h 0075h 0076h 0077h 0078h 0079h 007Ah 007Bh 007Ch 007Dh 007Eh 007Fh Timer RB Interrupt Control Register INT1 Interrupt Control Register INT3 Interrupt Control Register Symbol FMRDYIC Page 127
Processor Mode Register 0 Processor Mode Register 1 System Clock Control Register 0 System Clock Control Register 1 Module Standby Control Register System Clock Control Register 3 Protect Register Reset Source Determination Register Oscillation Stop Detection Register Watchdog Timer Reset Register Watchdog Timer Start Register Watchdog Timer Control Register
PM0 PM1 CM0 CM1 MSTCR CM3 PRCR RSTFR OCD WDTR WDTS WDTC
28 158 92 93 224, 355, 386 94 120 28 95 158 158 159
TRCIC
127
TREIC S2TIC S2RIC KUPIC ADIC SSUIC/IICIC
126 126 126 126 126 127
S0TIC S0RIC
126 126
High-Speed On-Chip Oscillator Control Register 7 FRA7
95
TRAIC TRBIC INT1IC INT3IC
126 126 128 128
Count Source Protection Mode Register
CSPR
159
INT0 Interrupt Control Register UART2 Bus Collision Detection Interrupt Control Register
INT0IC U2BCNIC
128 126
High-Speed On-Chip Oscillator Control Register 0 High-Speed On-Chip Oscillator Control Register 1 High-Speed On-Chip Oscillator Control Register 2 On-Chip Reference Voltage Control Register Clock Prescaler Reset Flag High-Speed On-Chip Oscillator Control Register 4 High-Speed On-Chip Oscillator Control Register 5 High-Speed On-Chip Oscillator Control Register 6
FRA0 FRA1 FRA2 OCVREFCR CPSRF FRA4 FRA5 FRA6
96 96 97 434 97 98 98 98
High-Speed On-Chip Oscillator Control Register 3 FRA3 Voltage Monitor Circuit/Comparator A Control CMPA Register Voltage Monitor Circuit Edge Select Register VCAC Voltage Detect Register 1 Voltage Detect Register 2 VCA1 VCA2
98 41, 458 42, 458 42, 459 43, 99, 460 44 45 46, 461 47, 462
Voltage Monitor 1/Compare A1 Interrupt Control Register Voltage Monitor 2/Compare A2 Interrupt Control Register
VCMP1IC VCMP2IC
126 126
Voltage Detection 1 Level Select Register Voltage Monitor 0 Circuit Control Register Voltage Monitor 1 Circuit Control Register Voltage Monitor 2 Circuit Control Register
VD1LS VW0C VW1C VW2C
Note: 1.
The blank regions are reserved. Do not access locations in these regions.
B-1
Address 0080h 0081h 0082h 0083h 0084h 0085h 0086h 0087h 0088h 0089h 008Ah 008Bh 008Ch 008Dh 008Eh 008Fh 0090h 0091h 0092h 0093h 0094h 0095h 0096h 0097h 0098h 0099h 009Ah 009Bh 009Ch 009Dh 009Eh 009Fh 00A0h 00A1h 00A2h 00A3h 00A4h 00A5h 00A6h 00A7h 00A8h 00A9h 00AAh 00ABh 00ACh 00ADh 00AEh 00AFh 00B0h 00B1h 00B2h 00B3h 00B4h 00B5h 00B6h 00B7h 00B8h 00B9h 00BAh 00BBh 00BCh 00BDh 00BEh 00BFh
Register DTC Start Control Register
Symbol DTCTL
Page 170
DTC Start Enable Register 0 DTC Start Enable Register 1 DTC Start Enable Register 2 DTC Start Enable Register 3 DTC Start Enable Register 5 DTC Start Enable Register 6
DTCEN0 DTCEN1 DTCEN2 DTCEN3 DTCEN5 DTCEN6
169 169 169 169 169 169
UART0 Transmit/Receive Mode Register UART0 Bit Rate Register UART0 Transmit Buffer Register UART0 Transmit/Receive Control Register 0 UART0 Transmit/Receive Control Register 1 UART0 Receive Buffer Register UART2 Transmit/Receive Mode Register UART2 Bit Rate Register UART2 Transmit Buffer Register UART2 Transmit/Receive Control Register 0 UART2 Transmit/Receive Control Register 1 UART2 Receive Buffer Register UART2 Digital Filter Function Select Register
U0MR U0BRG U0TB U0C0 U0C1 U0RB U2MR U2BRG U2TB U2C0 U2C1 U2RB URXDF
289 289 290 291 291 292 309 309 310 311 312 313 314
UART2 Special Mode Register 5 UART2 Special Mode Register 4 UART2 Special Mode Register 3 UART2 Special Mode Register 2 UART2 Special Mode Register
U2SMR5 U2SMR4 U2SMR3 U2SMR2 U2SMR
314 315 315 316 316
Address 00C0h 00C1h 00C2h 00C3h 00C4h 00C5h 00C6h 00C7h 00C8h 00C9h 00CAh 00CBh 00CCh 00CDh 00CEh 00CFh 00D0h 00D1h 00D2h 00D3h 00D4h 00D5h 00D6h 00D7h 00D8h 00D9h 00DAh 00DBh 00DCh 00DDh 00DEh 00DFh 00E0h 00E1h 00E2h 00E3h 00E4h 00E5h 00E6h 00E7h 00E8h 00E9h 00EAh 00EBh 00ECh 00EDh 00EEh 00EFh 00F0h 00F1h 00F2h 00F3h 00F4h 00F5h 00F6h 00F7h 00F8h 00F9h 00FAh 00FBh 00FCh 00FDh 00FEh 00FFh
Register A/D Register 0 A/D Register 1 A/D Register 2 A/D Register 3 A/D Register 4 A/D Register 5 A/D Register 6 A/D Register 7
Symbol AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7
Page 435 435 435 435 435 435 435 435
A/D Mode Register A/D Input Select Register A/D Control Register 0 A/D Control Register 1
ADMOD ADINSEL ADCON0 ADCON1
436 437 438 439
Port P1 Register Port P1 Direction Register Port P3 Register Port P3 Direction Register Port P4 Register Port P4 Direction Register
P1 PD1 P3 PD3 P4 PD4
66 65 66 65 66 65
Note: 1.
The blank regions are reserved. Do not access locations in these regions.
B-2
Address Register 0100h Timer RA Control Register 0101h Timer RA I/O Control Register 0102h 0103h 0104h 0105h 0106h 0107h 0108h 0109h 010Ah 010Bh 010Ch 010Dh 010Eh 010Fh 0110h 0111h 0112h 0113h 0114h 0115h 0116h 0117h 0118h 0119h 011Ah 011Bh 011Ch 011Dh 011Eh 011Fh 0120h 0121h 0122h 0123h 0124h 0125h 0126h 0127h 0128h 0129h 012Ah 012Bh 012Ch 012Dh 012Eh 012Fh 0130h 0131h 0132h 0133h 0134h 0135h 0136h 0137h 0138h 0139h 013Ah 013Bh 013Ch 013Dh 013Eh 013Fh Timer RA Mode Register Timer RA Prescaler Register Timer RA Register LIN Control Register 2 LIN Control Register LIN Status Register Timer RB Control Register Timer RB One-Shot Control Register Timer RB I/O Control Register Timer RB Mode Register Timer RB Prescaler Register Timer RB Secondary Register Timer RB Primary Register
Symbol TRACR TRAIOC TRAMR TRAPRE TRA LINCR2 LINCR LINST TRBCR TRBOCR TRBIOC TRBMR TRBPRE TRBSC TRBPR
Page 185 185, 188, 191, 193, 195, 198 186 186 187 419 420 420 202 202 203, 206, 210, 213, 217 203 204 204 205
Timer RE Second Data Register / Counter Data Register Timer RE Minute Data Register / Compare Data Register Timer RE Hour Data Register Timer RE Day of Week Data Register Timer RE Control Register 1 Timer RE Control Register 2 Timer RE Count Source Select Register Timer RC Mode Register Timer RC Control Register 1 Timer RC Interrupt Enable Register Timer RC Status Register Timer RC I/O Control Register 0 Timer RC I/O Control Register 1 Timer RC Counter Timer RC General Register A Timer RC General Register B Timer RC General Register C Timer RC General Register D Timer RC Control Register 2 Timer RC Digital Filter Function Select Register Timer RC Output Master Enable Register Timer RC Trigger Control Register
TRESEC TREMIN TREHR TREWK TRECR1 TRECR2 TRECSR TRCMR TRCCR1 TRCIER TRCSR TRCIOR0 TRCIOR1 TRC TRCGRA TRCGRB TRCGRC TRCGRD TRCCR2 TRCDF TRCOER TRCADCR
272, 280 272, 280 273 273 274, 281 275, 281 276, 282 224 225, 246, 254, 260 225 226 227, 241, 247 227, 242, 248 228 228 228 228 228 229, 254, 261 229, 261 230 230
Address 0140h 0141h 0142h 0143h 0144h 0145h 0146h 0147h 0148h 0149h 014Ah 014Bh 014Ch 014Dh 014Eh 014Fh 0150h 0151h 0152h 0153h 0154h 0155h 0156h 0157h 0158h 0159h 015Ah 015Bh 015Ch 015Dh 015Eh 015Fh 0160h 0161h 0162h 0163h 0164h 0165h 0166h 0167h 0168h 0169h 016Ah 016Bh 016Ch 016Dh 016Eh 016Fh 0170h 0171h 0172h 0173h 0174h 0175h 0176h 0177h 0178h 0179h 017Ah 017Bh 017Ch 017Dh 017Eh 017Fh
Register
Symbol
Page
Note: 1.
The blank regions are reserved. Do not access locations in these regions.
B-3
Address 0180h 0181h 0182h 0183h 0184h 0185h 0186h 0187h 0188h 0189h 018Ah 018Bh 018Ch 018Dh 018Eh 018Fh 0190h 0191h 0192h 0193h 0194h 0195h 0196h 0197h 0198h 0199h 019Ah 019Bh 019Ch 019Dh 019Eh 019Fh 01A0h 01A1h 01A2h 01A3h 01A4h 01A5h 01A6h 01A7h 01A8h 01A9h 01AAh 01ABh 01ACh 01ADh 01AEh 01AFh 01B0h 01B1h 01B2h 01B3h 01B4h 01B5h 01B6h 01B7h 01B8h 01B9h 01BAh 01BBh 01BCh 01BDh 01BEh
Register Timer RA Pin Select Register Timer RC Pin Select Register Timer RC Pin Select Register 0 Timer RC Pin Select Register 1
Symbol TRASR TRBRCSR TRCPSR0 TRCPSR1
Page 67, 187 67, 231 68, 232 68, 232
UART0 Pin Select Register UART2 Pin Select Register 0 UART2 Pin Select Register 1 SSU/IIC Pin Select Register INT Interrupt Input Pin Select Register
U0SR U2SR0 U2SR1 SSUIICSR INTSR
69, 293 70, 317 70, 317 71, 355, 386 71, 136
SS Bit Counter Register SS Transmit Data Register L / IIC bus Transmit Data Register SS Transmit Data Register H SS Receive Data Register L / IIC bus Receive Data Register SS Receive Data Register H
SSBR SSTDR / ICDRT SSTDRH SSRDR / ICDRR SSRDRH
356 356, 387
357, 387
SS Control Register H / IIC bus Control SSCRH / Register 1 ICCR1 SS Control Register L / IIC bus Control Register 2 SSCRL / ICCR2 SS Mode Register / IIC bus Mode Register SSMR / ICMR SS Enable Register / IIC bus Interrupt Enable SSER / Register ICIER SS Status Register / IIC bus Status Register SSSR / ICSR SS Mode Register 2 / Slave Address Register SSMR2 / SAR
357, 388 358, 389 359, 390 360, 391 361, 392 362, 393
Flash Memory Status Register Flash Memory Control Register 0 Flash Memory Control Register 1 Flash Memory Control Register 2
FST FMR0 FMR1 FMR2
483 485 487 489
Address 01C0h 01C1h 01C2h 01C3h 01C4h 01C5h 01C6h 01C7h 01C8h 01C9h 01CAh 01CBh 01CCh 01CDh 01CEh 01CFh 01D0h 01D1h 01D2h 01D3h 01D4h 01D5h 01D6h 01D7h 01D8h 01D9h 01DAh 01DBh 01DCh 01DDh 01DEh 01DFh 01E0h 01E1h 01E2h 01E3h 01E4h 01E5h 01E6h 01E7h 01E8h 01E9h 01EAh 01EBh 01ECh 01EDh 01EEh 01EFh 01F0h 01F1h 01F2h 01F3h 01F4h 01F5h 01F6h 01F7h 01F8h 01F9h 01FAh 01FBh 01FCh 01FDh 01FEh 01FFh
Register Address Match Interrupt Register 0
Symbol RMAD0
Page 142
Address Match Interrupt Enable Register 0 Address Match Interrupt Register 1
AIER0 RMAD1
142 142
Address Match Interrupt Enable Register 1
AIER1
142
Pull-Up Control Register 0 Pull-Up Control Register 1
PUR0 PUR1
72 72
Port P1 Drive Capacity Control Register Drive Capacity Control Register 0 Drive Capacity Control Register 1 Input Threshold Control Register 0 Input Threshold Control Register 1 Comparator B Control Register 0 External Input Enable Register 0 INT Input Filter Select Register 0 Key Input Enable Register 0
P1DRR DRR0 DRR1 VLT0 VLT1 INTCMP INTEN INTF KIEN
73 74 75 76 76 473 137, 473 137, 474 140
Note: 1.
The blank regions are reserved. Do not access locations in these regions.
B-4
Address 2C00h 2C01h 2C02h 2C03h 2C04h 2C05h 2C06h 2C07h 2C08h 2C09h 2C0Ah : : 2C3Ah 2C3Bh 2C3Ch 2C3Dh 2C3Eh 2C3Fh 2C40h 2C41h 2C42h 2C43h 2C44h 2C45h 2C46h 2C47h 2C48h 2C49h 2C4Ah 2C4Bh 2C4Ch 2C4Dh 2C4Eh 2C4Fh 2C50h 2C51h 2C52h 2C53h 2C54h 2C55h 2C56h 2C57h 2C58h 2C59h 2C5Ah 2C5Bh 2C5Ch 2C5Dh 2C5Eh 2C5Fh 2C60h 2C61h 2C62h 2C63h 2C64h 2C65h 2C66h 2C67h 2C68h 2C69h 2C6Ah 2C6Bh 2C6Ch 2C6Dh 2C6Eh 2C6Fh
Register DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area DTC Transfer Vector Area
Symbol
Page
DTCD0
DTCD1
DTCD2
DTCD3
DTCD4
DTCD5
Address 2C70h 2C71h 2C72h 2C73h 2C74h 2C75h 2C76h 2C77h 2C78h 2C79h 2C7Ah 2C7Bh 2C7Ch 2C7Dh 2C7Eh 2C7Fh 2C80h 2C81h 2C82h 2C83h 2C84h 2C85h 2C86h 2C87h 2C88h 2C89h 2C8Ah 2C8Bh 2C8Ch 2C8Dh 2C8Eh 2C8Fh 2C90h 2C91h 2C92h 2C93h 2C94h 2C95h 2C96h 2C97h 2C98h 2C99h 2C9Ah 2C9Bh 2C9Ch 2C9Dh 2C9Eh 2C9Fh 2CA0h 2CA1h 2CA2h 2CA3h 2CA4h 2CA5h 2CA6h 2CA7h 2CA8h 2CA9h 2CAAh 2CABh 2CACh 2CADh 2CAEh 2CAFh
Register
Symbol
Page
DTCD6
DTCD7
DTCD8
DTCD9
DTCD10
DTCD11
DTCD12
DTCD13
Note: 1.
The blank regions are reserved. Do not access locations in these regions.
B-5
Address 2CB0h 2CB1h 2CB2h 2CB3h 2CB4h 2CB5h 2CB6h 2CB7h 2CB8h 2CB9h 2CBAh 2CBBh 2CBCh 2CBDh 2CBEh 2CBFh 2CC0h 2CC1h 2CC2h 2CC3h 2CC4h 2CC5h 2CC6h 2CC7h 2CC8h 2CC9h 2CCAh 2CCBh 2CCCh 2CCDh 2CCEh 2CCFh 2CD0h 2CD1h 2CD2h 2CD3h 2CD4h 2CD5h 2CD6h 2CD7h 2CD8h 2CD9h 2CDAh 2CDBh 2CDCh 2CDDh 2CDEh 2CDFh 2CE0h 2CE1h 2CE2h 2CE3h 2CE4h 2CE5h 2CE6h 2CE7h 2CE8h 2CE9h 2CEAh 2CEBh 2CECh 2CEDh 2CEEh 2CEFh
Register
Symbol
Page
DTCD14
DTCD15
DTCD16
Address 2CF0h 2CF1h 2CF2h 2CF3h 2CF4h 2CF5h 2CF6h 2CF7h 2CF8h 2CF9h 2CFAh 2CFBh 2CFCh 2CFDh 2CFEh 2CFFh 2D00h 2D01h 2D01h FFDBh
Register
Symbol
Page
DTCD22
DTCD23
Option Function Select Register 2 Option Function Select Register
OFS2 OFS
30, 154, 161 29, 48, 153, 160, 481
:
FFFFh
DTCD17
DTCD18
DTCD19
DTCD20
DTCD21
Note: 1.
The blank regions are reserved. Do not access locations in these regions.
B-6
PRELIMINARY
Notice: This is not a final specification. Some parametric limits are subject to change.
R8C/32A Group
RENESAS MCU
REJ09B0458-0010 Rev.0.10 Apr 01, 2008
1.
1.1
Overview
Features
The R8C/32A Group of single-chip MCUs incorporates the R8C/Tiny Series CPU core, employing sophisticated instructions for a high level of efficiency. With 1 Mbyte of address space, and it is capable of executing instructions at high speed. In addition, the CPU core boasts a multiplier for high-speed operation processing. Power consumption is low, and the supported operating modes allow additional power control. These MCUs also use an anti-noise configuration to reduce emissions of electromagnetic noise and are designed to withstand EMI. Integration of many peripheral functions, including multifunction timer and serial interface, reduces the number of system components. The R8C/32A Group has data flash (1 KB x 4 blocks) with the background operation (BGO) function.
1.1.1
Applications
Electronic household appliances, office equipment, audio equipment, consumer equipment, etc.
REJ09B0458-0010 Rev.0.10 Page 1 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
1. Overview
1.1.2
Specifications
Tables 1.1 and 1.2 outline the Specifications for R8C/32A Group. Table 1.1
Item CPU
Specifications for R8C/32A Group (1)
Function Central processing unit Specification R8C/Tiny series core * Number of fundamental instructions: 89 * Minimum instruction execution time: 50 ns (f(XIN) = 20 MHz, VCC = 3.0 to 5.5 V) 100 ns (f(XIN) = 10 MHz, VCC = 2.7 to 5.5 V) 200 ns (f(XIN) = 5 MHz, VCC = 2.2 to 5.5 V) 500 ns (f(XIN) = 2 MHz, VCC = 1.8 to 5.5 V) * Multiplier: 16 bits x 16 bits 32 bits * Multiply-accumulate instruction: 16 bits x 16 bits + 32 bits 32 bits * Operation mode: Single-chip mode (address space: 1 Mbyte) Refer to Table 1.3 Product List for R8C/32A Group. * Power-on reset * Voltage detection 3 (detection level of voltage detection 0 and voltage detection 1 selectable) * Input-only: 1 pin * CMOS I/O ports: 15, selectable pull-up resistor * High current drive ports: 15 4 circuits: XIN clock oscillation circuit, XCIN clock oscillation circuit (32 kHz) High-speed on-chip oscillator (with frequency adjustment function), Low-speed on-chip oscillator, * Oscillation stop detection: XIN clock oscillation stop detection function * Frequency divider circuit: Dividing selectable 1, 2, 4, 8, and 16 * Low power consumption modes: Standard operating mode (high-speed clock, low-speed clock, high-speed on-chip oscillator, low-speed on-chip oscillator), wait mode, stop mode Real-time clock (timer RE) * Number of interrupt vectors: 69 * External Interrupt: 7 (INT x 3, Key input x 4) * Priority levels: 7 levels * 15 bits x 1 (with prescaler) * Reset start selectable * Low-speed on-chip oscillator for watchdog timer selectable * 1 channel * Activation sources: 21 * Transfer modes: 2 (normal mode, repeat mode) 8 bits x 1 (with 8-bit prescaler) Timer mode (period timer), pulse output mode (output level inverted every period), event counter mode, pulse width measurement mode, pulse period measurement mode 8 bits x 1 (with 8-bit prescaler) Timer mode (period timer), programmable waveform generation mode (PWM output), programmable one-shot generation mode, programmable wait oneshot generation mode 16 bits x 1 (with 4 capture/compare registers) Timer mode (input capture function, output compare function), PWM mode (output 3 pins), PWM2 mode (PWM output pin) 8 bits x 1 Real-time clock mode (count seconds, minutes, hours, days of week), output compare mode
Memory
ROM, RAM, Data flash Power Supply Voltage detection Voltage circuit Detection I/O Ports Programmable I/O ports Clock Clock generation circuits
Interrupts
Watchdog Timer
DTC (Data Transfer Controller)
Timer
Timer RA
Timer RB
Timer RC
Timer RE
REJ09B0458-0010 Rev.0.10 Page 2 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
1. Overview
Table 1.2
Item Serial Interface
Specifications for R8C/32A Group (2)
Function UART0 UART2 Specification Clock synchronous serial I/O/UART Clock synchronous serial I/O/UART, I2C mode (I2C-bus), multiprocessor communication function 1 (shared with I2C-bus) 1 (shared with SSU) Hardware LIN: 1 (timer RA, UART0) 10-bit resolution x 4 channels, includes sample and hold function, with sweep mode * 2 circuits (shared with voltage monitor 1 and voltage monitor 2) * External reference voltage input available 2 circuits * Programming and erasure voltage: VCC = 2.7 to 5.5 V * Programming and erasure endurance: 10,000 times (data flash) 1,000 times (program ROM) * Program security: ROM code protect, ID code check * Debug functions: On-chip debug, on-board flash rewrite function * Background operation (BGO) function f(XIN) = 20 MHz (VCC = 3.0 to 5.5 V) f(XIN) = 10 MHz (VCC = 2.7 to 5.5 V) f(XIN) = 5 MHz (VCC = 2.2 to 5.5 V) f(XIN) = 2 MHz (VCC = 1.8 to 5.5 V) TBD (VCC = 5.0 V, f(XIN) = 20 MHz) TBD (VCC = 3.0 V, f(XIN) = 10 MHz) TBD (VCC = 3.0 V, wait mode (f(XCIN) = 32 kHz)) TBD (VCC = 3.0 V, stop mode) -20 to 85C (N version) -40 to 85C (D version) (1) 20-pin LSSOP Package code: PLSP0020JB-A (previous code: 20P2F-A)
Synchronous Serial Communication Unit (SSU) I2C bus LIN Module A/D Converter Comparator A Comparator B Flash Memory
Operating Frequency/Supply Voltage Current consumption
Operating Ambient Temperature Package
Note: 1. Specify the D version if D version functions are to be used.
REJ09B0458-0010 Rev.0.10 Page 3 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
1. Overview
1.2
Product List
Table 1.3 lists Product List for R8C/32A Group, and Figure 1.1 shows a Part Number, Memory Size, and Package of R8C/32A Group. Table 1.3 Product List for R8C/32A Group ROM Capacity Program ROM Data flash 4 Kbytes 1 Kbyte x 4 8 Kbytes 1 Kbyte x 4 16 Kbytes 1 Kbyte x 4 4 Kbytes 1 Kbyte x 4 8 Kbytes 1 Kbyte x 4 16 Kbytes 1 Kbyte x 4 RAM Capacity 512 bytes 1 Kbyte 1.5 Kbytes 512 bytes 1 Kbyte 1.5 Kbytes Current of Apr. 2008 Package Type PLSP0020JB-A PLSP0020JB-A PLSP0020JB-A PLSP0020JB-A PLSP0020JB-A PLSP0020JB-A Remarks N version
Part No. R5F21321ANSP (D) R5F21322ANSP (D) R5F21324ANSP (D) R5F21321ADSP (D) R5F21322ADSP (D) R5F21324ADSP (D)
D version
(D): Under development
Part No.
R 5 F 21 32 4 A N FP
Package type: FP: PLSP0020JB-A (0.65 mm pin-pitch) Classification N: Operating ambient temperature -20C to 85C D: Operating ambient temperature -40C to 85C ROM capacity 1: 4 KB 2: 8 KB 4: 16 KB R8C/32A Group R8C/Tiny Series Memory type F: Flash memory Renesas MCU Renesas semiconductor
Figure 1.1
Part Number, Memory Size, and Package of R8C/32A Group
REJ09B0458-0010 Rev.0.10 Page 4 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
1. Overview
1.3
Block Diagram
Figure 1.2 shows a Block Diagram.
8
4
3
1
I/O ports Peripheral functions
Timers Timer RA (8 bits x 1) Timer RB (8 bits x 1) Timer RC (16 bits x 1) Timer RE (8 bits x 1)
Port P1
Port P3
Port P4
UART or clock synchronous serial I/O (8 bits x 2) I2C bus or SSU (8 bits x 1)
System clock generation circuit XIN-XOUT High-speed on-chip oscillator Low-speed on-chip oscillator XCIN-XCOUT
Watchdog timer (15 bits) A/D converter (10 bits x 4 channels)
LIN module Low-speed on-chip oscillator for watchdog timer Comparator B Voltage detection circuit
Comparator A
DTC
R8C/Tiny Series CPU core
R0H R1H R2 R3 A0 A1 FB R0L R1L SB USP ISP INTB PC FLG
Memory
ROM (1)
RAM (2)
Multiplier
Notes: 1. ROM size varies with MCU type. 2. RAM size varies with MCU type.
Figure 1.2
Block Diagram
REJ09B0458-0010 Rev.0.10 Page 5 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
1. Overview
1.4
Pin Assignment
Figure 1.3 shows Pin Assignment (Top View). Table 1.4 outlines the Pin Name Information by Pin Number.
P4_2/VREF MODE RESET P4_7/XOUT(/XCOUT) VSS/AVSS P4_6/XIN(/XCIN) VCC/AVCC P3_7/SDA/SSO/TRAO(/RXD2/SCL2/TXD2/SDA2) P3_5/SCL/SSCK(/CLK2/TRCIOD) P3_4/IVREF3/SSI(/RXD2/SCL2/TXD2/SDA2/TRCIOC)
1 2 3
20 19 18 17 16 15 14 13 12 11
P1_0/AN8/LVCMP1/KI0(/TRCIOD) P1_1/AN9/LVCMP2/KI1(/TRCIOA/TRCTRG) P1_2/AN10/LVREF/Kl2(/TRCIOB) P1_3/AN11/LVCOUT1/Kl3/TRBO(/TRCIOC) P1_4(/TXD0/TRCCLK) P1_5(/INT1/RXD0/TRAIO) P1_6/LVCOUT2/IVREF1(/CLK0) P1_7/IVCMP1/INT1(/TRAIO) P4_5/ADTRG/INT0(/RXD2/SCL2) P3_3/IVCMP3/INT3/SCS(/CTS2/RTS2/TRCCLK)
R8C/32A Group
PLSP0020JB-A (20P2F-A) (top view)
4 5 6 7 8 9 10
Notes: 1. Can be assigned to the pin in parentheses by a program. 2. Confirm the pin 1 position on the package by referring to the package dimensions.
Figure 1.3
Pin Assignment (Top View)
REJ09B0458-0010 Rev.0.10 Page 6 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
1. Overview
Table 1.4
Pin Name Information by Pin Number
I/O Pin Functions for Peripheral Modules A/D Converter, Comparator A, Comparator B, Voltage Detection Circuit VREF
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Control Pin
Port
Interrupt
Timer
Serial Interface
SSU
I2C bus
P4_2 MODE RESET XOUT(/XCOUT) VSS/AVSS XIN(/XCIN) VCC/AVCC P4_7 P4_6 P3_7 P3_5 P3_4 P3_3 P4_5 P1_7 P1_6 P1_5 P1_4 P1_3 P1_2 P1_1 P1_0 INT3 INT0 INT1 (INT1) KI3 KI2 KI1 KI0 TRAO (TRCIOD) (TRCIOC) (RXD2/SCL2/ SSO TXD2/SDA2) (CLK2) SSCK (RXD2/SCL2/ SSI TXD2/SDA2) SCS SDA SCL
IVREF3 IVCMP3 ADTRG IVCMP1 LVCOUT2/IVREF1
(TRCCLK) (CTS2/RTS2) (RXD2/SCL2) (TRAIO) (TRAIO) (TRCCLK) TRBO (/TRCIOC) (TRCIOB) (TRCIOA/ TRCTRG) (TRCIOD) (CLK0) (RXD0) (TXD0)
AN11/LVCOUT1 AN10/LVREF AN9/LVCMP2 AN8/LVCMP1
Note: 1. Can be assigned to the pin in parentheses by a program.
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Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
1. Overview
1.5
Pin Functions
Tables 1.5 and 1.6 list Pin Functions. Table 1.5
Item Power supply input Analog power supply input Reset input MODE XIN clock input XIN clock output XCIN clock input XCIN clock output INT interrupt input Key input interrupt Timer RA Timer RB Timer RC
Pin Functions (1)
Pin Name VCC, VSS AVCC, AVSS RESET MODE XIN XOUT XCIN XCOUT INT0, INT1, INT3 KI0 to KI3 TRAIO TRAO TRBO TRCCLK TRCTRG TRCIOA, TRCIOB, TRCIOC, TRCIOD I/O Type - - I I I I/O (2) I O I I I/O O O I I I/O I/O I O I O I/O I/O I/O I/O I/O I/O I/O I/O Description Apply 1.8 V to 5.5 V to the VCC pin. Apply 0 V to the VSS pin. Power supply for the A/D converter. Connect a capacitor between AVCC and AVSS. Input "L" on this pin resets the MCU. Connect this pin to VCC via a resistor. These pins are provided for XIN clock generation circuit I/O. Connect a ceramic resonator or a crystal oscillator between the XIN and XOUT pins (1). To use an external clock, input it to the XOUT pin and leave the XIN pin open. These pins are provided for XCIN clock generation circuit I/O. Connect a crystal oscillator between the XCIN and XCOUT pins (1). To use an external clock, input it to the XCIN pin and leave the XCOUT pin open. INT interrupt input pins. INT0 is timer RB, and RC input pin. Key input interrupt input pins Timer RA I/O pin Timer RA output pin Timer RB output pin External clock input pin External trigger input pin Timer RC I/O pins Transfer clock I/O pins Serial data input pins Serial data output pins Transmission control input pin Reception control output pin I2C mode clock I/O pin I2C mode data I/O pin Clock I/O pin Data I/O pin Data I/O pin Chip-select signal I/O pin Clock I/O pin Data I/O pin
Serial interface
CLK0, CLK2 RXD0, RXD2 TXD0, TXD2 CTS2 RTS2 SCL2 SDA2
I2C bus SSU
SCL SDA SSI SCS SSCK SSO
I: Input O: Output I/O: Input and output Notes: 1. Refer to the oscillator manufacturer for oscillation characteristics. 2. To use an externally generated clock, input it to XOUT.
REJ09B0458-0010 Rev.0.10 Page 8 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
1. Overview
Table 1.6
Item
Pin Functions (2)
Pin Name VREF AN8 to AN11 ADTRG LVCMP1, LVCMP2 LVREF LVCOUT1, LVCOUT2 I/O Type I I I I I O I I I I/O Description Reference voltage input pin to A/D converter Analog input pins to A/D converter AD external trigger input pin Comparator A analog voltage input pins Comparator A reference voltage input pin Comparator A output pins Comparator B analog voltage input pins Comparator B reference voltage input pins Detection voltage input pin for voltage detection 2 CMOS I/O ports. Each port has an I/O select direction register, allowing each pin in the port to be directed for input or output individually. Any port set to input can be set to use a pull-up resistor or not by a program. All ports can be used as LED drive ports. Input-only port
Reference voltage input A/D converter Comparator A
Comparator B Voltage detection circuit I/O port
IVCMP1, IVCMP3 IVREF1, IVREF3 LVCMP2 P1_0 to P1_7, P3_3 to P3_5, P3_7, P4_5 to P4_7
Input port I: Input O: Output
P4_2 I/O: Input and output
I
REJ09B0458-0010 Rev.0.10 Page 9 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
2. Central Processing Unit (CPU)
2.
Central Processing Unit (CPU)
Figure 2.1 shows the CPU Registers. The CPU contains 13 registers. R0, R1, R2, R3, A0, A1, and FB configure a register bank. There are two sets of register bank.
b31
b15
b8b7
b0
R2 R3
R0H (high-order of R0) R0L (low-order of R0) R1H (high-order of R1) R1L (low-order of R1) Data registers (1)
R2 R3 A0 A1 FB
b19 b15 b0
Address registers (1) Frame base register (1)
INTBH
INTBL
Interrupt table register
The 4 high order bits of INTB are INTBH and the 16 low order bits of INTB are INTBL.
b19 b0
PC
Program counter
b15
b0
USP ISP SB
b15 b0
User stack pointer Interrupt stack pointer Static base register
FLG
b15 b8 b7 b0
Flag register
IPL
U I OBSZDC
Carry flag Debug flag Zero flag Sign flag Register bank select flag Overflow flag Interrupt enable flag Stack pointer select flag Reserved bit Processor interrupt priority level Reserved bit
Note: 1. These registers comprise a register bank. There are two register banks.
Figure 2.1
CPU Registers
REJ09B0458-0010 Rev.0.10 Page 10 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
2. Central Processing Unit (CPU)
2.1
Data Registers (R0, R1, R2, and R3)
R0 is a 16-bit register for transfer, arithmetic, and logic operations. The same applies to R1 to R3. R0 can be split into high-order bits (R0H) and low-order bits (R0L) to be used separately as 8-bit data registers. R1H and R1L are analogous to R0H and R0L. R2 can be combined with R0 and used as a 32-bit data register (R2R0). R3R1 is analogous to R2R0.
2.2
Address Registers (A0 and A1)
A0 is a 16-bit register for address register indirect addressing and address register relative addressing. It is also used for transfer, arithmetic, and logic operations. A1 is analogous to A0. A1 can be combined with A0 and as a 32bit address register (A1A0).
2.3
Frame Base Register (FB)
FB is a 16-bit register for FB relative addressing.
2.4
Interrupt Table Register (INTB)
INTB is a 20-bit register that indicates the starting address of an interrupt vector table.
2.5
Program Counter (PC)
PC is 20 bits wide and indicates the address of the next instruction to be executed.
2.6
User Stack Pointer (USP) and Interrupt Stack Pointer (ISP)
The stack pointers (SP), USP and ISP, are each 16 bits wide. The U flag of FLG is used to switch between USP and ISP.
2.7
Static Base Register (SB)
SB is a 16-bit register for SB relative addressing.
2.8
Flag Register (FLG)
FLG is an 11-bit register indicating the CPU state.
2.8.1
Carry Flag (C)
The C flag retains carry, borrow, or shift-out bits that have been generated by the arithmetic and logic unit.
2.8.2
Debug Flag (D)
The D flag is for debugging only. Set it to 0.
2.8.3
Zero Flag (Z)
The Z flag is set to 1 when an arithmetic operation results in 0; otherwise to 0.
2.8.4
Sign Flag (S)
The S flag is set to 1 when an arithmetic operation results in a negative value; otherwise to 0.
2.8.5
Register Bank Select Flag (B)
Register bank 0 is selected when the B flag is 0. Register bank 1 is selected when this flag is set to 1.
2.8.6
Overflow Flag (O)
The O flag is set to 1 when an operation results in an overflow; otherwise to 0.
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Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
2. Central Processing Unit (CPU)
2.8.7
Interrupt Enable Flag (I)
The I flag enables maskable interrupts. Interrupts are disabled when the I flag is set to 0, and are enabled when the I flag is set to 1. The I flag is set to 0 when an interrupt request is acknowledged.
2.8.8
Stack Pointer Select Flag (U)
ISP is selected when the U flag is set to 0; USP is selected when the U flag is set to 1. The U flag is set to 0 when a hardware interrupt request is acknowledged or the INT instruction of software interrupt numbers 0 to 31 is executed.
2.8.9
Processor Interrupt Priority Level (IPL)
IPL is 3 bits wide and assigns processor interrupt priority levels from level 0 to level 7. If a requested interrupt has higher priority than IPL, the interrupt is enabled.
2.8.10
Reserved Bit
If necessary, set to 0. When read, the content is undefined.
REJ09B0458-0010 Rev.0.10 Page 12 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
3. Memory
3.
3.1
Memory
R8C/32A Group
Figure 3.1 is a Memory Map of R8C/32A Group. The R8C/32A Group has a 1-Mbyte address space from addresses 00000h to FFFFFh. The internal ROM (program ROM) is allocated lower addresses, beginning with address 0FFFFh. For example, a 16-Kbyte internal ROM area is allocated addresses 0C000h to 0FFFFh. The fixed interrupt vector table is allocated addresses 0FFDCh to 0FFFFh. The starting address of each interrupt routine is stored here. The internal ROM (data flash) is allocated addresses 03000h to 03FFFh. The internal RAM is allocated higher addresses, beginning with address 00400h. For example, a 1.5-Kbyte internal RAM area is allocated addresses 00400h to 009FFh. The internal RAM is used not only for data storage but also as a stack area when a subroutine is called or when an interrupt request is acknowledged. Special function registers (SFRs) are allocated addresses 00000h to 002FFh and 02C00h to 02FFFh. Peripheral function control registers are allocated here. All unallocated spaces within the SFRs are reserved and cannot be accessed by users.
00000h
002FFh 00400h
SFR (Refer to 4. Special Function Registers (SFRs))
Internal RAM
0XXXXh
0FFD8h
Reserved area
0FFDCh
02C00h 02FFFh 03000h
SFR (Refer to 4. Special Function Registers (SFRs))
Internal ROM (data flash) (1) 03FFFh 0YYYYh
Undefined instruction Overflow BRK instruction Address match Single step
Watchdog timer, oscillation stop detection, voltage monitor
Internal ROM (program ROM)
0FFFFh
0FFFFh
(Reserved) (Reserved) Reset
Internal ROM (program ROM)
ZZZZZh FFFFFh
Notes: 1. Data flash indicates block A (1 Kbyte), block B (1 Kbyte), block C (1 Kbyte), and block D (1 Kbyte). 2. The blank areas are reserved and cannot be accessed by users. Internal ROM Part Number R5F21321ANFP, R5F21321ADFP R5F21322ANFP, R5F21322ADFP R5F21324ANFP, R5F21324ADFP Size 4 Kbytes 8 Kbytes 16 Kbytes Address 0YYYYh 0F000h 0E000h 0C000h Address ZZZZZh - - - Size 512 bytes 1 Kbyte 1.5 Kbytes Internal RAM Address 0XXXXh 005FFh 007FFh 009FFh
Figure 3.1
Memory Map of R8C/32A Group
REJ09B0458-0010 Rev.0.10 Page 13 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
4.
Special Function Registers (SFRs)
An SFR (special function register) is a control register for a peripheral function. Tables 4.1 to 4.12 list the special function registers. Table 4.1
Address 0000h 0001h 0002h 0003h 0004h 0005h 0006h 0007h 0008h 0009h 000Ah 000Bh 000Ch 000Dh 000Eh 000Fh 0010h 0011h 0012h 0013h 0014h 0015h 0016h 0017h 0018h 0019h 001Ah 001Bh 001Ch 001Dh 001Eh 001Fh 0020h 0021h 0022h 0023h 0024h 0025h 0026h 0027h 0028h 0029h 002Ah 002Bh 002Ch 002Dh 002Eh 002Fh 0030h 0031h 0032h 0033h 0034h 0035h 0036h 0037h 0038h
SFR Information (1) (1)
Register Symbol After Reset
Processor Mode Register 0 Processor Mode Register 1 System Clock Control Register 0 System Clock Control Register 1 Module Standby Control Register System Clock Control Register 3 Protect Register Reset Source Determination Register Oscillation Stop Detection Register Watchdog Timer Reset Register Watchdog Timer Start Register Watchdog Timer Control Register
PM0 PM1 CM0 CM1 MSTCR CM3 PRCR RSTFR OCD WDTR WDTS WDTC
00h 00h 00101000b 00100000b 00h 00h 00h 0XXX00XXb (2) 00000100b XXh XXh 00111111b
High-Speed On-Chip Oscillator Control Register 7
FRA7
When shipping
Count Source Protection Mode Register
CSPR
00h 10000000b (3)
High-Speed On-Chip Oscillator Control Register 0 High-Speed On-Chip Oscillator Control Register 1 High-Speed On-Chip Oscillator Control Register 2 On-Chip Reference Voltage Control Register Clock Prescaler Reset Flag High-Speed On-Chip Oscillator Control Register 4 High-Speed On-Chip Oscillator Control Register 5 High-Speed On-Chip Oscillator Control Register 6
FRA0 FRA1 FRA2 OCVREFCR CPSRF FRA4 FRA5 FRA6
00h When shipping 00h 00h 00h When Shipping When Shipping When Shipping
High-Speed On-Chip Oscillator Control Register 3 Voltage Monitor Circuit / Comparator A Control Register Voltage Monitor Circuit Edge Select Register Voltage Detect Register 1 Voltage Detect Register 2
FRA3 CMPA VCAC VCA1 VCA2
When shipping 00h 00h 00001000b 00h (4) 00100000b (5) 00000111b 1100X010b (4) 1100X011b (5) 10001010b
Voltage Detection 1 Level Select Register Voltage Monitor 0 Circuit Control Register
VD1LS VW0C
0039h Voltage Monitor 1 Circuit Control Register VW1C X: Undefined Notes: 1. The blank areas are reserved and cannot be accessed by users. 2. The CWR bit in the RSTFR register is set to 0 after power-on and voltage monitor 0 reset. Software reset, watchdog timer reset, or oscillation stop detection reset does not affect this bit. 3. The CSPROINI bit in the OFS register is set to 0. 4. The LVDAS bit in the OFS register is set to 1. 5. The LVDAS bit in the OFS register is set to 0.
REJ09B0458-0010 Rev.0.10 Page 14 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.2
SFR Information (2) (1)
Symbol VW2C After Reset 10000010b
Address Register 003Ah Voltage Monitor 2 Circuit Control Register 003Bh 003Ch 003Dh 003Eh 003Fh 0040h 0041h Flash Memory Ready Interrupt Control Register 0042h 0043h 0044h 0045h 0046h 0047h Timer RC Interrupt Control Register 0048h 0049h 004Ah Timer RE Interrupt Control Register 004Bh UART2 Transmit Interrupt Control Register 004Ch UART2 Receive Interrupt Control Register 004Dh Key Input Interrupt Control Register 004Eh A/D Conversion Interrupt Control Register 004Fh SSU Interrupt Control Register / IIC bus Interrupt Control Register (2) 0050h 0051h UART0 Transmit Interrupt Control Register 0052h UART0 Receive Interrupt Control Register 0053h 0054h 0055h 0056h Timer RA Interrupt Control Register 0057h 0058h Timer RB Interrupt Control Register 0059h INT1 Interrupt Control Register 005Ah INT3 Interrupt Control Register 005Bh 005Ch 005Dh INT0 Interrupt Control Register 005Eh UART2 Bus Collision Detection Interrupt Control Register 005Fh 0060h 0061h 0062h 0063h 0064h 0065h 0066h 0067h 0068h 0069h 006Ah 006Bh 006Ch 006Dh 006Eh 006Fh 0070h 0071h 0072h Voltage Monitor 1 / Compare A1 Interrupt Control Register 0073h Voltage Monitor 2 / Compare A2 Interrupt Control Register 0074h 0075h 0076h 0077h 0078h 0079h 007Ah 007Bh 007Ch 007Dh 007Eh 007Fh X: Undefined Notes: 1. The blank areas are reserved and cannot be accessed by users. 2. Selectable by the IICSEL bit in the SSUIICSR register.
FMRDYIC
XXXXX000b
TRCIC
XXXXX000b
TREIC S2TIC S2RIC KUPIC ADIC SSUIC / IICIC S0TIC S0RIC
XXXXX000b XXXXX000b XXXXX000b XXXXX000b XXXXX000b XXXXX000b XXXXX000b XXXXX000b
TRAIC TRBIC INT1IC INT3IC
XXXXX000b XXXXX000b XX00X000b XX00X000b
INT0IC U2BCNIC
XX00X000b XXXXX000b
VCMP1IC VCMP2IC
XXXXX000b XXXXX000b
REJ09B0458-0010 Rev.0.10 Page 15 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.3
Address 0080h 0081h 0082h 0083h 0084h 0085h 0086h 0087h 0088h 0089h 008Ah 008Bh 008Ch 008Dh 008Eh 008Fh 0090h 0091h 0092h 0093h 0094h 0095h 0096h 0097h 0098h 0099h 009Ah 009Bh 009Ch 009Dh 009Eh 009Fh 00A0h 00A1h 00A2h 00A3h 00A4h 00A5h 00A6h 00A7h 00A8h 00A9h 00AAh 00ABh 00ACh 00ADh 00AEh 00AFh 00B0h 00B1h 00B2h 00B3h 00B4h 00B5h 00B6h 00B7h 00B8h 00B9h 00BAh 00BBh 00BCh 00BDh 00BEh 00BFh
SFR Information (3) (1)
Register DTC Activation Control Register Symbol DTCTL After Reset 00h
DTC Activation Enable Register 0 DTC Activation Enable Register 1 DTC Activation Enable Register 2 DTC Activation Enable Register 3 DTC Activation Enable Register 5 DTC Activation Enable Register 6
DTCEN0 DTCEN1 DTCEN2 DTCEN3 DTCEN5 DTCEN6
00h 00h 00h 00h 00h 00h
UART0 Transmit / Receive Mode Register UART0 Bit Rate Register UART0 Transmit Buffer Register UART0 Transmit / Receive Control Register 0 UART0 Transmit / Receive Control Register 1 UART0 Receive Buffer Register UART2 Transmit / Receive Mode Register UART2 Bit Rate Register UART2 Transmit Buffer Register UART2 Transmit / Receive Control Register 0 UART2 Transmit / Receive Control Register 1 UART2 Receive Buffer Register UART2 Digital Filter Function Select Register
U0MR U0BRG U0TB U0C0 U0C1 U0RB U2MR U2BRG U2TB U2C0 U2C1 U2RB URXDF
00h XXh XXh XXh 00001000b 00000010b XXh XXh 00h XXh XXh XXh 00001000b 00000010b XXh XXh 00h
UART2 Special Mode Register 5 UART2 Special Mode Register 4 UART2 Special Mode Register 3 UART2 Special Mode Register 2 UART2 Special Mode Register
U2SMR5 U2SMR4 U2SMR3 U2SMR2 U2SMR
00h 00h 000X0X0Xb X0000000b X0000000b
X: Undefined Note: 1. The blank areas are reserved and cannot be accessed by users.
REJ09B0458-0010 Rev.0.10 Page 16 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.4
SFR Information (4) (1)
Symbol AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 After Reset XXXh 000000XXb XXh 000000XXb XXh 000000XXb XXh 000000XXb XXh 000000XXb XXh 000000XXb XXh 000000XXb XXh 000000XXb
Address Register 00C0h A/D Register 0 00C1h 00C2h A/D Register 1 00C3h 00C4h A/D Register 2 00C5h 00C6h A/D Register 3 00C7h 00C8h A/D Register 4 00C9h 00CAh A/D Register 5 00CBh 00CCh A/D Register 6 00CDh 00CEh A/D Register 7 00CFh 00D0h 00D1h 00D2h 00D3h 00D4h A/D Mode Register 00D5h A/D Input Select Register 00D6h A/D Control Register 0 00D7h A/D Control Register 1 00D8h 00D9h 00DAh 00DBh 00DCh 00DDh 00DEh 00DFh 00E0h 00E1h Port P1 Register 00E2h 00E3h Port P1 Direction Register 00E4h 00E5h Port P3 Register 00E6h 00E7h Port P3 Direction Register 00E8h Port P4 Register 00E9h 00EAh Port P4 Direction Register 00EBh 00ECh 00EDh 00EEh 00EFh 00F0h 00F1h 00F2h 00F3h 00F4h 00F5h 00F6h 00F7h 00F8h 00F9h 00FAh 00FBh 00FCh 00FDh 00FEh 00FFh X: Undefined Note: 1. The blank areas are reserved and cannot be accessed by users.
ADMOD ADINSEL ADCON0 ADCON1
00h 11000000b 00h 00h
P1 PD1 P3 PD3 P4 PD4
XXh 00h XXh 00h XXh 00h
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.5
Address 0100h 0101h 0102h 0103h 0104h 0105h 0106h 0107h 0108h 0109h 010Ah 010Bh 010Ch 010Dh 010Eh 010Fh 0110h 0111h 0112h 0113h 0114h 0115h 0116h 0117h 0118h 0119h 011Ah 011Bh 011Ch 011Dh 011Eh 011Fh 0120h 0121h 0122h 0123h 0124h 0125h 0126h 0127h 0128h 0129h 012Ah 012Bh 012Ch 012Dh 012Eh 012Fh 0130h 0131h 0132h 0133h 0134h 0135h 0136h 0137h 0138h 0139h 013Ah 013Bh 013Ch 013Dh 013Eh 013Fh Note: 1.
SFR Information (5) (1)
Register Timer RA Control Register Timer RA I/O Control Register Timer RA Mode Register Timer RA Prescaler Register Timer RA Register LIN Control Register 2 LIN Control Register LIN Status Register Timer RB Control Register Timer RB One-Shot Control Register Timer RB I/O Control Register Timer RB Mode Register Timer RB Prescaler Register Timer RB Secondary Register Timer RB Primary Register Symbol TRACR TRAIOC TRAMR TRAPRE TRA LINCR2 LINCR LINST TRBCR TRBOCR TRBIOC TRBMR TRBPRE TRBSC TRBPR After Reset 00h 00h 00h FFh FFh 00h 00h 00h 00h 00h 00h 00h FFh FFh FFh
Timer RE Second Data Register / Counter Data Register Timer RE Minute Data Register / Compare Data Register Timer RE Hour Data Register Timer RE Day of Week Data Register Timer RE Control Register 1 Timer RE Control Register 2 Timer RE Count Source Select Register Timer RC Mode Register Timer RC Control Register 1 Timer RC Interrupt Enable Register Timer RC Status Register Timer RC I/O Control Register 0 Timer RC I/O Control Register 1 Timer RC Counter Timer RC General Register A Timer RC General Register B Timer RC General Register C Timer RC General Register D Timer RC Control Register 2 Timer RC Digital Filter Function Select Register Timer RC Output Master Enable Register Timer RC Trigger Control Register
TRESEC TREMIN TREHR TREWK TRECR1 TRECR2 TRECSR TRCMR TRCCR1 TRCIER TRCSR TRCIOR0 TRCIOR1 TRC TRCGRA TRCGRB TRCGRC TRCGRD TRCCR2 TRCDF TRCOER TRCADCR
00h 00h 00h 00h 00h 00h 00001000b 01001000b 00h 01110000b 01110000b 10001000b 10001000b 00h 00h FFh FFh FFh FFh FFh FFh FFh FFh 00011000b 00h 01111111b 00h
The blank areas are reserved and cannot be accessed by users.
REJ09B0458-0010 Rev.0.10 Page 18 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.6
SFR Information (6) (1)
Symbol After Reset
Address Register 0140h 0141h 0142h 0143h 0144h 0145h 0146h 0147h 0148h 0149h 014Ah 014Bh 014Ch 014Dh 014Eh 014Fh 0150h 0151h 0152h 0153h 0154h 0155h 0156h 0157h 0158h 0159h 015Ah 015Bh 015Ch 015Dh 015Eh 015Fh 0160h 0161h 0162h 0163h 0164h 0165h 0166h 0167h 0168h 0169h 016Ah 016Bh 016Ch 016Dh 016Eh 016Fh 0170h 0171h 0172h 0173h 0174h 0175h 0176h 0177h 0178h 0179h 017Ah 017Bh 017Ch 017Dh 017Eh 017Fh X: Undefined Note: 1. The blank areas are reserved and cannot be accessed by users.
REJ09B0458-0010 Rev.0.10 Page 19 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.7
SFR Information (7) (1)
Symbol TRASR TRBRCSR TRCPSR0 TRCPSR1 After Reset 00h 00h 00h 00h
Address Register 0180h Timer RA Pin Select Register 0181h Timer RC Pin Select Register 0182h Timer RC Pin Select Register 0 0183h Timer RC Pin Select Register 1 0184h 0185h 0186h 0187h 0188h UART0 Pin Select Register 0189h 018Ah UART2 Pin Select Register 0 018Bh UART2 Pin Select Register 1 018Ch SSU / IIC Pin Select Register 018Dh 018Eh INT Interrupt Input Pin Select Register 018Fh 0190h 0191h 0192h 0193h SS Bit Counter Register 0194h SS Transmit Data Register L / IIC bus Transmit Data Register (2) 0195h SS Transmit Data Register H 0196h SS Receive Data Register L / IIC bus Receive Data Register (2) 0197h SS Receive Data Register H (2) 0198h SS Control Register H / IIC bus Control Register 1 (2) 0199h SS Control Register L / IIC bus Control Register 2 (2) 019Ah SS Mode Register / IIC bus Mode Register (2) 019Bh SS Enable Register / IIC bus Interrupt Enable Register (2) 019Ch SS Status Register / IIC bus Status Register (2) 019Dh SS Mode Register 2 / Slave Address Register (2) 019Eh 019Fh 01A0h 01A1h 01A2h 01A3h 01A4h 01A5h 01A6h 01A7h 01A8h 01A9h 01AAh 01ABh 01ACh 01ADh 01AEh 01AFh 01B0h 01B1h 01B2h Flash Memory Status Register 01B3h 01B4h Flash Memory Control Register 0 01B5h Flash Memory Control Register 1 01B6h Flash Memory Control Register 2 01B7h 01B8h 01B9h 01BAh 01BBh 01BCh 01BDh 01BEh 01BFh X: Undefined Notes: 1. The blank areas are reserved and cannot be accessed by users. 2. Selectable by the IICSEL bit in the SSUIICSR register.
U0SR U2SR0 U2SR1 SSUIICSR INTSR
00h 00h 00h 00h 00h
SSBR SSTDR / ICDRT SSTDRH SSRDR / ICDRR SSRDRH SSCRH / ICCR1 SSCRL / ICCR2 SSMR / ICMR SSER / ICIER SSSR / ICSR SSMR2 / SAR
11111000b FFh FFh FFh FFh 00h 01111101b 00011000b 00h 00h / 0000X000b 00h
FST FMR0 FMR1 FMR2
10000X00b 00h 00h 00h
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.8
SFR Information (8) (1)
Symbol RMAD0 After Reset XXh XXh 0000XXXXb 00h XXh XXh 0000XXXXb 00h
Address Register 01C0h Address Match Interrupt Register 0 01C1h 01C2h 01C3h Address Match Interrupt Enable Register 0 01C4h Address Match Interrupt Register 1 01C5h 01C6h 01C7h Address Match Interrupt Enable Register 1 01C8h 01C9h 01CAh 01CBh 01CCh 01CDh 01CEh 01CFh 01D0h 01D1h 01D2h 01D3h 01D4h 01D5h 01D6h 01D7h 01D8h 01D9h 01DAh 01DBh 01DCh 01DDh 01DEh 01DFh 01E0h Pull-Up Control Register 0 01E1h Pull-Up Control Register 1 01E2h 01E3h 01E4h 01E5h 01E6h 01E7h 01E8h 01E9h 01EAh 01EBh 01ECh 01EDh 01EEh 01EFh 01F0h Port P1 Drive Capacity Control Register 01F1h 01F2h Drive Capacity Control Register 0 01F3h Drive Capacity Control Register 1 01F4h 01F5h Input Threshold Control Register 0 01F6h Input Threshold Control Register 1 01F7h 01F8h Comparator B Control Register 0 01F9h 01FAh External Input Enable Register 0 01FBh 01FCh INT Input Filter Select Register 0 01FDh 01FEh Key Input Enable Register 0 01FFh X: Undefined Note: 1. The blank areas are reserved and cannot be accessed by users.
AIER0 RMAD1
AIER1
PUR0 PUR1
00h 00h
P1DRR DRR0 DRR1 VLT0 VLT1 INTCMP INTEN INTF KIEN
00h 00h 00h 00h 00h 00h 00h 00h 00h
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Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.9
SFR Information (9) (1)
Symbol XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh After Reset
Address Register 2C00h DTC Transfer Vector Area 2C01h DTC Transfer Vector Area 2C02h DTC Transfer Vector Area 2C03h DTC Transfer Vector Area 2C04h DTC Transfer Vector Area 2C05h DTC Transfer Vector Area 2C06h DTC Transfer Vector Area 2C07h DTC Transfer Vector Area 2C08h DTC Transfer Vector Area 2C09h DTC Transfer Vector Area 2C0Ah DTC Transfer Vector Area : DTC Transfer Vector Area : DTC Transfer Vector Area 2C3Ah DTC Transfer Vector Area 2C3Bh DTC Transfer Vector Area 2C3Ch DTC Transfer Vector Area 2C3Dh DTC Transfer Vector Area 2C3Eh DTC Transfer Vector Area 2C3Fh DTC Transfer Vector Area 2C40h DTC Control Data 0 2C41h 2C42h 2C43h 2C44h 2C45h 2C46h 2C47h 2C48h DTC Control Data 1 2C49h 2C4Ah 2C4Bh 2C4Ch 2C4Dh 2C4Eh 2C4Fh 2C50h DTC Control Data 2 2C51h 2C52h 2C53h 2C54h 2C55h 2C56h 2C57h 2C58h DTC Control Data 3 2C59h 2C5Ah 2C5Bh 2C5Ch 2C5Dh 2C5Eh 2C5Fh 2C60h DTC Control Data 4 2C61h 2C62h 2C63h 2C64h 2C65h 2C66h 2C67h 2C68h DTC Control Data 5 2C69h 2C6Ah 2C6Bh 2C6Ch 2C6Dh 2C6Eh 2C6Fh X: Undefined Note: 1. The blank areas are reserved and cannot be accessed by users.
DTCD0
DTCD1
DTCD2
DTCD3
DTCD4
DTCD5
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Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.10
SFR Information (10) (1)
Symbol DTCD6 After Reset XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh
Address Register 2C70h DTC Control Data 6 2C71h 2C72h 2C73h 2C74h 2C75h 2C76h 2C77h 2C78h DTC Control Data 7 2C79h 2C7Ah 2C7Bh 2C7Ch 2C7Dh 2C7Eh 2C7Fh 2C80h DTC Control Data 8 2C81h 2C82h 2C83h 2C84h 2C85h 2C86h 2C87h 2C88h DTC Control Data 9 2C89h 2C8Ah 2C8Bh 2C8Ch 2C8Dh 2C8Eh 2C8Fh 2C90h DTC Control Data 10 2C91h 2C92h 2C93h 2C94h 2C95h 2C96h 2C97h 2C98h DTC Control Data 11 2C99h 2C9Ah 2C9Bh 2C9Ch 2C9Dh 2C9Eh 2C9Fh 2CA0h DTC Control Data 12 2CA1h 2CA2h 2CA3h 2CA4h 2CA5h 2CA6h 2CA7h 2CA8h DTC Control Data 13 2CA9h 2CAAh 2CABh 2CACh 2CADh 2CAEh 2CAFh X: Undefined Note: 1. The blank areas are reserved and cannot be accessed by users.
DTCD7
DTCD8
DTCD9
DTCD10
DTCD11
DTCD12
DTCD13
REJ09B0458-0010 Rev.0.10 Page 23 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.11
SFR Information (11) (1)
Symbol DTCD14 After Reset XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh
Address Register 2CB0h DTC Control Data 14 2CB1h 2CB2h 2CB3h 2CB4h 2CB5h 2CB6h 2CB7h 2CB8h DTC Control Data 15 2CB9h 2CBAh 2CBBh 2CBCh 2CBDh 2CBEh 2CBFh 2CC0h DTC Control Data 16 2CC1h 2CC2h 2CC3h 2CC4h 2CC5h 2CC6h 2CC7h 2CC8h DTC Control Data 17 2CC9h 2CCAh 2CCBh 2CCCh 2CCDh 2CCEh 2CCFh 2CD0h DTC Control Data 18 2CD1h 2CD2h 2CD3h 2CD4h 2CD5h 2CD6h 2CD7h 2CD8h DTC Control Data 19 2CD9h 2CDAh 2CDBh 2CDCh 2CDDh 2CDEh 2CDFh 2CE0h DTC Control Data 20 2CE1h 2CE2h 2CE3h 2CE4h 2CE5h 2CE6h 2CE7h 2CE8h DTC Control Data 21 2CE9h 2CEAh 2CEBh 2CECh 2CEDh 2CEEh 2CEFh X: Undefined Note: 1. The blank areas are reserved and cannot be accessed by users.
DTCD15
DTCD16
DTCD17
DTCD18
DTCD19
DTCD20
DTCD21
REJ09B0458-0010 Rev.0.10 Page 24 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
4. Special Function Registers (SFRs)
Table 4.12
Address 2CF0h 2CF1h 2CF2h 2CF3h 2CF4h 2CF5h 2CF6h 2CF7h 2CF8h 2CF9h 2CFAh 2CFBh 2CFCh 2CFDh 2CFEh 2CFFh 2D00h 2D01h
SFR Information (12) (1)
Register DTC Control Data 22 Symbol DTCD22 After Reset XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh XXh
DTC Control Data 23
DTCD23
FFDBh Option Function Select Register 2 : FFFFh Option Function Select Register X: Undefined Notes: 1. The blank areas are reserved and cannot be accessed by users. 2. This register cannot be changed by a program. Use a flash programmer to write to it.
OFS2 OFS
(Note 2) (Note 2)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
5.
Resets
The following resets are implemented: hardware reset, power-on reset, voltage monitor 0 reset, watchdog timer reset, and software reset. Table 5.1 lists the Reset Names and Sources and Figure 5.1 shows the Block Diagram of Reset Circuit. Table 5.1 Reset Names and Sources Reset Name Hardware reset Power-on reset Voltage monitor 0 reset Watchdog timer reset Software reset Source Input voltage of RESET pin is held "L" VCC rises VCC falls (monitor voltage: Vdet0) Underflow of watchdog timer Write 1 to PM03 bit in PM0 register
RESET
Hardware reset
VCC
Power-on reset circuit
Power-on reset
Voltage detection circuit
Voltage monitor 0 reset
Watchdog timer
Watchdog timer reset
Pin, CPU, and SFR CPU
Software reset
Note: 1. The CWR bit in the RSTFR register is set to 0 (cold start-up) after power-on or voltage monitor 0 reset. This bit remains unchanged at a software reset, watchdog timer reset, or oscillation detection reset.
Figure 5.1
Block Diagram of Reset Circuit
REJ09B0458-0010 Rev.0.10 Page 26 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
Table 5.2 shows the Pin Functions while RESET Pin Level is "L", Figure 5.2 shows the CPU Register Status after Reset, Figure 5.3 shows the Reset Sequence. Table 5.2 Pin Functions while RESET Pin Level is "L" Pin Function Input port Input port
Pin Name P1, P3_3 to P3_5, P3_7 P4_2, P4_5 to P4_7
b15
b0
0000h 0000h 0000h 0000h 0000h 0000h 0000h
b19 b0
Data register (R0) Data register (R1) Data register (R2) Data register (R3) Address register (A0) Address register (A1) Frame base register (FB)
00000h Content of addresses 0FFFEh to 0FFFCh
b15 b0
Interrupt table register (INTB) Program counter (PC)
0000h 0000h 0000h
b15 b0
User stack pointer (USP) Interrupt stack pointer (ISP) Static base register (SB)
0000h
b15 b8 b7 b0
Flag register (FLG)
IPL
U I OBSZDC
Figure 5.2
CPU Register Status after Reset
fOCO-S
RESET pin 10 cycles or more are needed (1) fOCO-S clock x 8 cycles (2) Internal reset signal Start time of flash memory (CPU clock x 178 cycles) CPU clock x 28 cycles
CPU clock 0FFFCh Address (internal address signal) 0FFFDh Content of reset vector Notes: 1. Hardware reset. 2. When the "L" input width to the RESET pin is set to fOCO-S clock x 8 cycles or more, setting the RESET pin to "H" also sets the internal reset signal to "H" at the same time. 0FFFEh
Figure 5.3
Reset Sequence Apr 01, 2008
REJ09B0458-0010 Rev.0.10 Page 27 of 572
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
5.1 5.1.1
Registers Processor Mode Register 0 (PM0)
b6 -- 0 b5 -- 0 b4 -- 0 b3 PM03 0 b2 -- 0 b1 -- 0 Function Set to 0. b0 -- 0 R/W R/W
Address 0004h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name -- Reserved bits -- -- PM03 Software reset bit -- -- -- --
The MCU is reset when this bit is set to 1. When read, the content is 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0.
R/W --
Set the PRC1 bit in the PRCR register to 1 (write enabled) before rewriting the PM0 register.
5.1.2
Reset Source Determination Register (RSTFR)
b6 -- X b5 -- X b4 -- X b3 WDR 0 b2 SWR 0 b1 HWR X b0 CWR X
Address 000Bh Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
(Note 1) R/W R/W R R R R
Symbol Bit Name CWR Cold start-up/warm start-up determine flag (2, 3) HWR Hardware reset detect flag SWR WDR -- -- -- -- Software reset detect flag Watchdog timer reset detect flag Reserved bits
Function 0: Cold start-up 1: Warm start-up 0: Not detected 1: Detected 0: Not detected 1: Detected 0: Not detected 1: Detected When read, the content is undefined.
Reserved bit
Set to 0.
R/W
Notes: 1. The CWR bit is set to 0 (cold start-up) after power-on or voltage monitor 0 reset. This bit remains unchanged at a software reset, or watchdog timer reset. 2. If 1 is written to the CWR bit by a program, it is set to 1. (Writing 0 does not affect this bit.) 3. When the VW0C0 bit in the VW0C register is set to 0 (voltage monitor 0 reset disabled), the CWR bit value is undefined.
REJ09B0458-0010 Rev.0.10 Page 28 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
5.1.3
Option Function Select Register (OFS)
b6 LVDAS 1 b5 b4 b3 b2 VDSEL1 VDSEL0 ROMCP1 ROMCR 1 1 1 1 b1 -- 1 b0 WDTON 1 (Note 1) R/W R/W R/W R/W R/W R/W R/W
Address 0FFFFh Bit b7 Symbol CSPROINI When shipping 1 Bit b0 b1 b2 b3 b4 b5
Symbol Bit Name WDTON Watchdog timer start select bit -- Reserved bit ROMCR ROM code protect disable bit ROMCP1 ROM code protect bit VDSEL0 Voltage detection 0 level select bit (2) VDSEL1
Function 0: Watchdog timer automatically starts after reset. 1: Watchdog timer is stopped after reset. Set to 1. 0: ROM code protect disabled 1: ROMCP1 bit enabled 0: ROM code protect enabled 1: ROM code protect disabled
b5 b4
b6 b7
LVDAS
Voltage detection 0 circuit start bit (3)
CSPROINI Count source protection mode after reset select bit
0 0: 3.80 V selected (Vdet0_3) 0 1: 2.85 V selected (Vdet0_2) 1 0: 2.35 V selected (Vdet0_1) 1 1: 1.90 V selected (Vdet0_0) 0: Voltage monitor 0 reset enabled after reset 1: Voltage monitor 0 reset disabled after reset 0: Count source protect mode enabled after reset 1: Count source protect mode disabled after reset
R/W R/W
Notes: 1. If the block including the OFS register is erased, the OFS register value is set to FFh. 2. The same level of the voltage detection 0 level selected by bits VDSEL0 and VDESL1 is set in both functions of voltage monitor 0 reset and power-on reset. 3. To use power-on reset, set the LVDAS bit to 0 (voltage monitor 0 reset enabled after reset).
The OFS register is allocated in the flash memory. Write to this register with a program. After writing, do not write additions to this register.
LVDAS Bit (Voltage Detection 0 Circuit Start Bit)
The Vdet0 voltage to be monitored by the voltage detection 0 circuit is selected by bits VDSEL0 and VDSEL1.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
5.1.4
Option Function Select Register 2 (OFS2)
b6 -- 1 b5 -- 1 b4 -- 1 b3 b2 b1 b0 WDTRCS1 WDTRCS0 WDTUFS1 WDTUFS0 1 1 1 1 (Note 1) Function
b1 b0
Address 0FFDBh Bit b7 Symbol -- When shipping 1 Bit b0 b1
Symbol Bit Name WDTUFS0 Watchdog timer underflow period set bit WDTUFS1
0 0: 03FFh 0 1: 0FFFh 1 0: 1FFFh 1 1: 3FFFh
b3 b2
R/W R/W R/W
b2 b3
WDTRCS0 Watchdog timer refresh acknowledgement period WDTRCS1 set bit
b4 b5 b6 b7
-- -- -- --
Reserved bits
0 0: 25% 0 1: 50% 1 0: 75% 1 1: 100% Set to 1.
R/W R/W
R/W
Note: 1. If the block including the OFS2 register is erased, the OFS2 register value is set to FFh.
The OFS2 register is located on the flash memory. Write to this register with a program. After writing, do not write additions to this register.
Bits WDTRCS0 and WDTRCS1 (Watchdog Timer Refresh Acknowledgement Period Set Bit)
Assuming that the period from when the watchdog timer starts counting until it underflows is 100%, the refresh acknowledgement period for the watchdog timer can be selected. For details, refer to 14.3.1.1 Refresh Acknowledgment Period.
REJ09B0458-0010 Rev.0.10 Page 30 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
5.2
Hardware Reset
A reset is applied using the RESET pin. When an "L" signal is applied to the RESET pin while the supply voltage meets the recommended operating conditions, pins, CPU, and SFRs are all reset (refer to Table 5.2 Pin Functions while RESET Pin Level is "L"). When the input level applied to the RESET pin changes from "L" to "H", a program is executed beginning with the address indicated by the reset vector. After reset, the low-speed on-chip oscillator clock with no division is automatically selected as the CPU clock. Refer to 4. Special Function Registers (SFRs) for the states of the SFRs after reset. The internal RAM is not reset. If the RESET pin is pulled "L" while writing to the internal RAM is in progress, the contents of internal RAM will be undefined. Figure 5.4 shows an Example of Hardware Reset Circuit and Operation and Figure 5.5 shows an Example of Hardware Reset Circuit (Usage Example of External Supply Voltage Detection Circuit) and Operation.
5.2.1
When Power Supply is Stable
(1) Apply "L" to the RESET pin. (2) Wait for 10 s. (3) Apply "H" to the RESET pin.
5.2.2
Power On
(1) Apply "L" to the RESET pin. (2) Let the supply voltage increase until it meets the recommended operating conditions. (3) Wait for td(P-R) or more to allow the internal power supply to stabilize (refer to 32. Electrical Characteristics). (4) Wait for 10 s. (5) Apply "H" to the RESET pin.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
VCC VCC 0V RESET RESET
1.8 V
0.2 VCC or below 0V td(P-R) + 10 s or more
Note:
1. Refer to 32. Electrical Characteristics.
Figure 5.4
Example of Hardware Reset Circuit and Operation
Supply voltage detection circuit
5V VCC 1.8 V
RESET
VCC 0V 5V RESET
0V td(P-R) + 10 s or more Example when VCC = 5 V Note: 1. Refer to 32. Electrical Characteristics.
Figure 5.5
Example of Hardware Reset Circuit (Usage Example of External Supply Voltage Detection Circuit) and Operation
REJ09B0458-0010 Rev.0.10 Page 32 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
5.3
Power-On Reset Function
When the RESET pin is connected to the VCC pin via a pull-up resistor, and the VCC pin voltage level rises while the rise gradient is trth or more, the power-on reset function is enabled and the MCU resets its pins, CPU, and SFR. When a capacitor is connected to the RESET pin, too, always keep the voltage to the RESET pin 0.8VCC or more. When the input voltage to the VCC pin reaches the Vdet0 level or above, the low-speed on-chip oscillator clock starts counting. When the low-speed on-chip oscillator clock count reaches 8, the internal reset signal is held "H" and the MCU enters the reset sequence (refer to Figure 5.3). The low-speed on-chip oscillator clock with no division is automatically selected as the CPU clock after reset. Refer to 4. Special Function Registers (SFRs) for the states of the SFR after power-on reset. After power-on reset, voltage monitor 0 reset is enabled when the LVDAS bit in the OFS register is set to 0 (voltage monitor 0 reset enabled after reset). Figure 5.6 shows an Example of Power-On Reset Circuit and Operation.
VCC 4.7 k (reference) RESET
Vdet0 trth Vccmin Vpor1 trth
External Power VCC tw(por1) Internal reset signal ("L" valid) 1 x8 fOCO-S 1 x8 fOCO-S
Notes: 1. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to 6. Voltage Detection Circuit for details. 2. Refer to 32. Electrical Characteristics. 3. To use the power-on reset function, enable voltage monitor 0 reset by setting the LVDAS bit in the OFS register to 0, the VW0C0 and VW0C6 bits in the VW0C register to 1 respectively, and the VCA25 bit in the VCA2 register to 1.
Figure 5.6
Example of Power-On Reset Circuit and Operation
REJ09B0458-0010 Rev.0.10 Page 33 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
5.4
Voltage Monitor 0 Reset
A reset is applied using the on-chip voltage detection 0 circuit. The voltage detection 0 circuit monitors the input voltage to the VCC pin. The voltage to monitor is Vdet0. The Vdet0 voltage detection level can be changed by the settings of bits VDSEL0 to VDSEL1 in the OFS register. When the input voltage to the VCC pin reaches the Vdet0 level or below, the pins, CPU, and SFR are reset. When the input voltage to the VCC pin reaches the Vdet0 level or above, the low-speed on-chip oscillator clock start counting. When the low-speed on-chip oscillator clock count reaches 8, the internal reset signal is held "H" and the MCU enters the reset sequence (refer to Figure 5.3). The low-speed on-chip oscillator clock with no division is automatically selected as the CPU clock after reset. The LVDAS bit in the OFS register can be used to select whether voltage monitor 0 reset is enabled or disabled after a reset. The setting of the LVDAS bit is enabled at all resets. To use the power-on reset function, enable voltage monitor 0 reset by setting the LVDAS bit in the OFS register to 0, the VW0C0 and VW0C6 bits in the VW0C register to 1 respectively, and the VCA25 bit in the VCA2 register to 1. Bits VDSEL0 to VDSEL1 and LVDAS cannot be changed by a program. To set these bits, write values to b4 to b6 of address 0FFFFh using a flash programmer. Refer to 5.1.3 Option Function Select Register (OFS) for details of the OFS register. Refer to 4. Special Function Registers (SFRs) for the status of the SFR after voltage monitor 0 reset. The internal RAM is not reset. When the input voltage to the VCC pin reaches the Vdet0 level or below while writing to the internal RAM is in progress, the contents of internal RAM are undefined. Refer to 6. Voltage Detection Circuit for details of voltage monitor 0 reset. Figure 5.7 shows an Example of Voltage Monitor 0 Reset Circuit and Operation.
VCC 4.7 k (reference) RESET
tw(Vdet0) VCC Vdet0 Vccmin Vpor1 Sampling time (1, 2) Internal reset signal ("L" valid)
1 x8 fOCO-S Notes: 1. When using the voltage monitor 0 digital filter, ensure that the voltage is within the MCU operation voltage range (1.8 V or above) during the sampling time. 2. The sampling clock can be selected. Refer to 6. Voltage Detection Circuit for details. 3. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to 6. Voltage Detection Circuit for details. 4. Refer to 32. Electrical Characteristics. 5. To use the power-on reset function, enable voltage monitor 0 reset by setting the LVDAS bit in the OFS register to 0, the VW0C0 and VW0C6 bits in the VW0C register to 1 respectively, and the VCA25 bit in the VCA2 register to 1.
Figure 5.7
Example of Voltage Monitor 0 Reset Circuit and Operation Apr 01, 2008
REJ09B0458-0010 Rev.0.10 Page 34 of 572
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
5.5
Watchdog Timer Reset
When the PM12 bit in the PM1 register is set to 1 (reset when watchdog timer underflows), the MCU resets its pins, CPU, and SFR if the watchdog timer underflows. Then the program beginning with the address indicated by the reset vector is executed. After reset, the low-speed on-chip oscillator clock with no division is automatically selected as the CPU clock. Refer to 4. Special Function Registers (SFRs) for the states of the SFRs after watchdog timer reset. The internal RAM is not reset. When the watchdog timer underflows, the contents of internal RAM are undefined. The underflow period and refresh acknowledge period for the watchdog timer can be set by bits WDTUFS0 to WDTUFS1 and bits WDTRCS0 to WDTRCS1 in the OFS2 register, respectively. Refer to 14. Watchdog Timer for details of the watchdog timer.
5.6
Software Reset
When the PM03 bit in the PM0 register is set to 1 (MCU reset), the MCU resets its pins, CPU, and SFR. The program beginning with the address indicated by the reset vector is executed. After reset, the low-speed on-chip oscillator clock with no division is automatically selected for the CPU clock. Refer to 4. Special Function Registers (SFRs) for the states of the SFRs after software reset. The internal RAM is not reset.
REJ09B0458-0010 Rev.0.10 Page 35 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
5. Resets
5.7
Cold Start-Up/Warm Start-Up Determination Function
The cold start-up/warm start-up determination function uses the CWR bit in the RSTFR register to determine cold start-up (reset process) at power-on and warm start-up (reset process) when a reset occurred during operation. The CWR bit is set to 0 (cold start-up) at power-on and also set to 0 at a voltage monitor 0 reset. If 1 is written to the CWR bit by a program, it is set to 1. This bit remains unchanged at a software reset, or watchdog timer reset. The cold start-up/warm stat-up determination function uses voltage monitor 0 reset. To set the bits associated with voltage monitor 0 reset, follow Table 6.3 Procedure for Setting Bits Associated with Voltage Monitor 0 Reset. Figure 5.8 shows an Operating Example of Cold Start-Up/Warm Start-Up Function
5V
VCC
Vdet0 0V
Set to 1 by a program. Set to 1 by a program.
CWR bit in RSTFR register Voltage monitor 0 reset
The above applies when the digital filter is not used.
Figure 5.8
Operating Example of Cold Start-Up/Warm Start-Up Function
5.8
Reset Source Determination Function
The RSTFR register can be used to detect whether a hardware reset, software reset, or watchdog timer reset has occurred. If a hardware reset occurs, the HWR bit is set to 1 (detected). If a software reset occurs, the SWR bit is set to 1 (detected). If a watchdog timer reset occurs, the WDR bit is set to 1 (detected).
REJ09B0458-0010 Rev.0.10 Page 36 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.
Voltage Detection Circuit
The voltage detection circuit monitors the voltage input to the VCC pin. This circuit can be used to monitor the VCC input voltage by a program.
6.1
Overview
The detection voltage of voltage detection 0 can be selected among four levels using the OFS register. The detection voltage of voltage detection 1 can be selected among 16 levels using the VD1LS register. As a detection target, the voltage input to VCC and the LVCMP2 pin can be switched for voltage detection 2 only. The voltage monitor 0 reset, and voltage monitor 1 interrupt and voltage monitor 2 interrupt can also be used. Note that voltage monitor 1 and voltage monitor 2 share the voltage detection circuit with comparator A1 and comparator A2. Either voltage monitor 1 and voltage monitor 2 or comparator A1 and comparator A2 can be selected. Table 6.1
VCC monitor
Voltage Detection Circuit Specifications
Item Voltage to monitor Detection target Voltage Monitor 0 Vdet0 Whether passing through Vdet0 by falling Voltage Monitor 1 Vdet1 Whether passing through Vdet1 by rising or falling Voltage Monitor 2 Vdet2 Whether passing through Vdet2 by rising or falling The input voltage to VCC and the LVCMP2 pin can be switched by the VCA24 bit in the VCA2 register. The detection voltage level varies depending on when VCC is selected or when LVCMP2 is selected. Each value is set as the fixed level. The VCA13 bit in the VCA1 register Whether VCC or LVCMP2 input voltage is higher or lower than Vdet2 None
Detection voltage
Selectable among 4 levels using the OFS register.
Selectable among 16 levels using the VD1LS register.
Monitor
None
The VW1C3 bit in the VW1C register Whether VCC is higher or lower than Vdet1 None
Process at voltage detection
Reset
Interrupts
Voltage monitor 0 reset Reset at Vdet0 > VCC; CPU operation restarts at VCC > Vdet0 None
Digital filter
Switching Supported enable/disable Sampling (fOCO-S divided by n) x 4 (fOCO-S divided by n) x 2 time n: 1, 2, 4, and 8 n: 1, 2, 4, and 8
Voltage monitor 1 interrupt Non-maskable or maskable selectable Interrupt request at: Vdet1 > VCC and/or VCC > Vdet1 Supported
Voltage monitor 2 interrupt Non-maskable or maskable selectable Interrupt request at: Vdet2 > VCC (LVCMP2) and/or VCC (LVCMP2) > Vdet2 Supported (fOCO-S divided by n) x 2 n: 1, 2, 4, and 8
REJ09B0458-0010 Rev.0.10 Page 37 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
Shared with comparator A
VCA27
VCA24 = 1 LVCMP2 VCC VCA24 = 0
+ -
Voltage detection 2 signal Vdet2
VCA1 register
b3
VCA13 bit VCA26
Level Selection Circuit (16 levels) VD1S3 to VD1S0
Voltage detection 1 signal
+ -
Vdet1
VW1C register
b3
VW1C3 bit VCA25
Level Selection Circuit (4 levels)
+
Voltage detection 0 signal
Internal reference voltage
-
Vdet0 VCA13: Bit in VCA1 register VCA24, VCA25, VCA26, VCA27: Bits in VCA2 register VW1C3: Bit in VW1C register VD1S0 to VD1S3: Bits in VD1LS register VDSEL0, VDSEL1: Bits in OFS register
VDSEL1 to VDSEL0
Figure 6.1
Voltage Detection Circuit Block Diagram
Table 6.2
Pin Name LVCMP2
Pin Configuration of Voltage Detection Circuit I/O
Input Function Detection target voltage pin for voltage detection 2
REJ09B0458-0010 Rev.0.10 Page 38 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
Voltage monitor 0 reset generation circuit
VW0F1 to VW0F0 = 00b = 01b = 10b
Voltage detection 0 circuit
VCA25
fOCO-S
1/2
1/2
1/2
= 11b
VW0C1 VCC VDSEL1 to VDSEL0 Level selection + Digital filter Internal reference voltage Voltage detection 0 signal
When VCA25 bit is set to 0 (disabled), voltage detection 0 signal is driven high. Voltage monitor 0 reset signal VW0C1 VW0C0
VW0C0, VW0C1, VW0F0, VW0F1: Bits in VW0C register VCA25: Bit in VCA2 register VDSEL0, VDSEL1: Bits in OFS register
Figure 6.2
Block Diagram of Voltage Monitor 0 Reset Generation Circuit
Voltage monitor 1 interrupt generation circuit
VW1F1 to VW1F0 = 00b = 01b = 10b VW1C2 bit is set to 0 (not detected) by writing 0 by a program. When VCA26 bit is set to 0 (voltage detection 1 circuit disabled), VW1C2 bit is set to 0.
Voltage detection 1 circuit
VCA26
fOCO-S
1/2
VW1C3
1/2
1/2
= 11b
VCC VD1S3 to VD1S0
Level selection
VCA22 = 0 + VCA21 = 0 Voltage detection 1 signal
VW1C1 = 0 Digital filter VW1C1 = 1 Edge selection circuit VW1C2
Watchdog timer interrupt signal
Internal reference voltage When VCA26 bit is set to 0 (disabled), voltage detection 1 signal is driven high. VCA1C VW1C7
Voltage monitor 1 interrupt signal VW1C0
Non-maskable interrupt signal
Comparator A1 interrupt signal
COMPSEL IRQ1SEL
Maskable interrupt signal
VW1C0 to VW1C3, VW1F0, VW1F1, VW1C6, VW1C7: Bits in VW1C register VCA21, VCA22, VCA26: Bits in VCA2 register VD1S0 to VD1S3: Bits in VD1LS register COMPSEL, IRQ1SEL: Bits in CMPA register VCA1C: Bit in VCAC register
Figure 6.3
Block Diagram of Voltage Monitor 1 Interrupt Generation Circuit
REJ09B0458-0010 Rev.0.10 Page 39 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
Voltage monitor 2 interrupt generation circuit
VW2F1 to VW2F0 = 00b = 01b
Voltage detection 2 circuit
fOCO-S VCA27 VCA24 = 1 LVCMP2 VCC VCA24 = 0 VCA23 = 0 Internal reference voltage When VCA27 bit is set to 0 (disabled), voltage detection 2 signal is driven high. + Voltage detection 2 signal VCA13 VW2C1 = 0
= 10b
1/2
1/2
1/2
= 11b
VW2C2 bit is set to 0 (not detected) by writing 0 by a program. When VCA27 bit is set to 0 (voltage detection 2 circuit disabled), VW2C2 bit is set to 0.
Digital filter VW2C1 = 1 Edge selection circuit VW2C2
Watchdog timer interrupt signal
Voltage monitor 2 interrupt signal VCAC2 VW2C6 VW2C0
Non-maskable interrupt signal
Watchdog timer block VW2C3
Comparator A2 interrupt signal
Watchdog timer underflow signal VW2C3 bit is set to 0 (not detected) by writing 0 by a program. VW2C0 to VW2C3, VW2F0, VW2F1, VW2C6, VW2C7: Bits in VW2C VCA13: Bit in VCA1 register VCA23, VCA24, VCA27: Bits in VCA2 register COMPSEL, IRQ2SEL: Bits in CMPA register VCAC2: Bit in VCAC register COMPSEL IRQ2SEL Maskable interrupt signal
Figure 6.4
Block Diagram of Voltage Monitor 2 Interrupt Generation Circuit
REJ09B0458-0010 Rev.0.10 Page 40 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.2 6.2.1
Registers Voltage Monitor Circuit/Comparator A Control Register (CMPA)
b6 -- 0 b5 IRQ2SEL 0 b4 IRQ1SEL 0 b3 CM2OE 0 b2 CM1OE 0 b1 CM2POR 0 b0 CM1POR 0 R/W R/W
Address 0030h Bit b7 Symbol COMPSEL After Reset 0 Bit b0 Symbol CM1POR
b1
b2 b3 b4 b5 b6 b7
Function 0: Non-inverted comparator A1 comparison result is output to LVCOUT1. 1: Inverted comparator A1 comparison result is output to LVCOUT1. CM2POR LVCOUT2 output polarity 0: Non-inverted Comparator A2 comparison result is select bit output to LVCOUT2. 1: Inverted comparator A2 comparison result is output to LVCOUT2. CM1OE LVCOUT1 output enable bit 0: Output disabled 1: Output enabled CM2OE LVCOUT2 output enable bit 0: Output disabled 1: Output enabled IRQ1SEL Voltage monitor 1/comparator A1 0: Non-maskable interrupt interrupt type select bit 1: Maskable interrupt IRQ2SEL Voltage monitor 2/comparator A2 0: Non-maskable interrupt interrupt type select bit 1: Maskable interrupt -- Reserved bit Set to 0. COMPSEL Voltage monitor/comparator A 0: Bits IRQ1SEL and IRQ2SEL disabled interrupt type selection enable bit 1: Bits IRQ1SEL and IRQ2SEL enabled
Bit Name LVCOUT1 output polarity select bit
R/W
R/W R/W R/W R/W R/W R/W
REJ09B0458-0010 Rev.0.10 Page 41 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.2.2
Voltage Monitor Circuit Edge Select Register (VCAC)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 VCAC2 0 b1 VCAC1 0 b0 -- 0 R/W -- R/W R/W --
Address 0031h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. VCAC1 Voltage monitor 1 circuit edge select bit (1) 0: One edge 1: Both edges VCAC2 Voltage monitor 2 circuit edge select bit (2) 0: One edge 1: Both edges -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- -- --
Notes: 1. When the VCA1 bit is set tot 0 (one edge), the VW1C7 bit in the VW1C register is enabled. Set the VW1C7 bit after setting the VCAC1 bit to 0. 2. When the VCA2 bit is set tot 0 (one edge), the VW2C7 bit in the VW2C register is enabled. Set the VW2C7 bit after setting the VCAC2 bit to 0.
6.2.3
Voltage Detect Register (VCA1)
b6 -- 0 b5 -- 0 b4 -- 0 b3 VCA13 1 b2 -- 0 b1 -- 0 b0 -- 0 R/W R/W
Address 0033h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3
b4 b5 b6 b7
Symbol Bit Name Function -- Reserved bits Set to 0. -- -- VCA13 Voltage detection 2 signal monitor flag (1) 0: VCC < Vdet2 1: VCC Vdet2 or voltage detection 2 circuit disabled -- Reserved bits Set to 0. -- -- --
R
R/W
Note: 1. When the VCA27 bit in the VCA2 register is set to 1 (voltage detection 2 circuit enabled), the VCA13 bit is enabled. When the VCA27 bit in the VCA2 register is set to 0 (voltage detection 2 circuit disabled), the VCA13 bit is set to 1 (VCC Vdet2).
REJ09B0458-0010 Rev.0.10 Page 42 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.2.4
Voltage Detect Register 2 (VCA2)
b2 VCA22 0 0 b1 VCA21 0 0 b0 VCA20 0 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 0034h Bit b7 b6 b5 b4 b3 Symbol VCA27 VCA26 VCA25 VCA24 VCA23 After Reset The LVDAS bit in the OFS register is set to 1. 0 0 0 0 0 After Reset The LVDAS bit in the OFS register is set to 0. 0 0 1 0 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol Bit Name VCA20 Internal power low consumption enable bit (1) VCA21 Comparator A1 reference voltage input select bit VCA22 LVCMP1 comparison voltage external input select bit VCA23 Comparator A2 reference voltage input select bit VCA24 LVCMP2 comparison voltage external input select bit VCA25 Voltage detection 0 enable bit (3) VCA26 VCA27 Voltage detection 1/comparator A1 enable bit (4) Voltage detection 2/comparator A2 enable bit (5)
Function 0: Low consumption disabled 1: Low consumption enabled (2) 0: Internal reference voltage 1: LVREF pin input voltage 0: Supply voltage (VCC) 1: LVCMP1 pin input voltage 0: Internal reference voltage 1: LVREF pin input voltage 0: Supply voltage (VCC) (Vdet2_0) 1: LVCMP2 pin input voltage (Vdet2_EXT) 0: Voltage detection 0 circuit disabled 1: Voltage detection 0 circuit enabled 0: Voltage detection 1/comparator A1 circuit disabled 1: Voltage detection 1/comparator A1 circuit enabled 0: Voltage detection 2/comparator A2 circuit disabled 1: Voltage detection 2/comparator A2 circuit enabled
Notes: 1. Use the VCA20 bit only when the MCU enters wait mode. To set the VCA20 bit, follow the procedure shown in Figure 9.3 Procedure for Reducing Internal Power Consumption Using VCA20 bit. 2. When the VCA20 bit is set to 1 (low consumption enabled), do not set the CM10 bit in the CM1 register to 1 (stop mode). 3. To use voltage monitor 0 reset, set the VCA25 bit to 1. After the VCA25 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection circuit starts operation. 4. To use the voltage detection 1/comparator A1 interrupt or the VW1C3 bit in the VW1C register, set the VCA26 bit to 1. After the VCA26 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 1/comparator A1 circuit starts operation. 5. To use the voltage detection 2/comparator A2 interrupt or the VCAC13 bit in the VCA1 register, set the VCA27 bit to 1. After the VCA27 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 2/comparator A2 circuit starts operation.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VCA2 register.
REJ09B0458-0010 Rev.0.10 Page 43 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.2.5
Voltage Detection 1 Level Select Register (VD1LS)
b6 -- 0 b5 -- 0 b4 -- 0 b3 VD1S3 0 b2 VD1S2 1 b1 VD1S1 1 b0 VD1S0 1 R/W R/W R/W R/W R/W
Address 0036h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3
Symbol Bit Name VD1S0 Voltage detection 1 level select bit VD1S1 (Reference voltage when the voltage falls) VD1S2 VD1S3
Function
b3 b2 b1 b0
b4 b5 b6 b7
-- -- -- --
Reserved bits
0 0 0 0: 2.20 V 0 0 0 1: 2.35 V 0 0 1 0: 2.50 V 0 0 1 1: 2.65 V 0 1 0 0: 2.80 V 0 1 0 1: 2.95 V 0 1 1 0: 3.10 V 0 1 1 1: 3.25 V 1 0 0 0: 3.40 V 1 0 0 1: 3.55 V 1 0 1 0: 3.70 V 1 0 1 1: 3.85 V 1 1 0 0: 4.00 V 1 1 0 1: 4.15 V 1 1 1 0: 4.30 V 1 1 1 1: 4.45 V Set to 0.
(Vdet1_0) (Vdet1_1) (Vdet1_2) (Vdet1_3) (Vdet1_4) (Vdet1_5) (Vdet1_6) (Vdet1_7) (Vdet1_8) (Vdet1_9) (Vdet1_A) (Vdet1_B) (Vdet1_C) (Vdet1_D) (Vdet1_E) (Vdet1_F)
R/W R/W R/W R/W
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VD1LS register.
REJ09B0458-0010 Rev.0.10 Page 44 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.2.6
Voltage Monitor 0 Circuit Control Register (VW0C)
b3 -- X X b2 -- 0 0 b1 VW0C1 1 1 b0 VW0C0 0 1 R/W R/W R/W
Address 0038h Bit b7 b6 b5 b4 Symbol -- -- VW0F1 VW0F0 After Reset The LVDAS bit in the OFS register is set to 1. 1 1 0 0 After Reset The LVDAS bit in the OFS register is set to 0. 1 1 0 0 Bit b0 b1 Symbol Bit Name VW0C0 Voltage monitor 0 reset enable bit (1)
b2 b3 b4 b5
b6 b7
Function 0: Disabled 1: Enabled VW0C1 Voltage monitor 0 digital filter disabled mode 0: Digital filter enabled mode select bit (digital filter circuit enabled) 1: Digital filter disabled mode (digital filter circuit disabled) -- Reserved bit Set to 0. -- Reserved bit When read, the content is undefined. b5 b4 VW0F0 Sampling clock select bit 0 0: fOCO-S divided by 1 VW0F1 0 1: fOCO-S divided by 2 1 0: fOCO-S divided by 4 1 1: fOCO-S divided by 8 -- Reserved bits Set to 1. --
R/W R R/W R/W
R/W R/W
Note: 1. The VW0C0 bit is enabled when the VCA25 bit in the VCA2 register is set to 1 (voltage detection 0 circuit enabled). Set the VW0C0 bit to 0 (disabled) when the VCA25 bit in the VCA2 register is set to 0 (voltage detection 0 circuit disabled). To set the VW0C0 bit to 1 (enabled), follow the procedure in Table 6.3 Procedure for Setting Bits Associated with Voltage Monitor 0 Reset.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before writing the VW0C register.
REJ09B0458-0010 Rev.0.10 Page 45 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.2.7
Voltage Monitor 1 Circuit Control Register (VW1C)
b6 -- 0 b5 VW1F1 0 b4 VW1F0 0 b3 VW1C3 1 b2 VW1C2 0 b1 VW1C1 1 b0 VW1C0 0 R/W R/W R/W
Address 0039h Bit b7 Symbol VW1C7 After Reset 1 Bit b0 b1
Symbol Bit Name VW1C0 Voltage monitor 1 reset enable bit (1) VW1C1
b2 b3
VW1C2 VW1C3
b4 b5
VW1F0 VW1F1
b6 b7
-- VW1C7
Function 0: Disabled 1: Enabled Voltage monitor 0 digital filter 0: Digital filter enabled mode (digital filter circuit enabled) disable mode select bit (2) 1: Digital filter disable mode (digital filter circuit disabled) 0: Not detected Voltage change detection flag (3, 4) 1: Vdet1 passing detected Voltage detection 1 signal monitor flag (3) 0: VCC < Vdet1 1: VCC Vdet1 or voltage detection 1 circuit disabled b5 b4 Sampling clock select bit 0 0: fOCO-S divided by 1 0 1: fOCO-S divided by 2 1 0: fOCO-S divided by 4 1 1: fOCO-S divided by 8 Reserved bit Set to 1. Voltage monitor 1 reset 0: When VCC reaches Vdet1 or above. 1: When VCC reaches Vdet1 or below. generation condition select bit (5)
R/W R
R/W R/W
R/W R/W
Notes: 1. The VW1C0 is enabled when the VCA26 bit in the VCA2 register is set to 1 (voltage detection 1 circuit enabled). Set the VW1C0 bit to 0 (disabled) when the VCA26 bit is set to 0 (voltage detection 1 circuit disabled). To set the VW0C0 bit to 1 (enabled), follow the procedure shown in Table 6.4 Procedure for Setting Bits Associated with Voltage Monitor 1 Interrupt. 2. To use the voltage monitor 1 interrupt to exit stop mode and to return again, write 0 and then 1 to the VW1C1 bit. 3. Bits VW1C2 and VW1C3 are enabled when the VCA26 bit in the VCA2 register is set to 1(voltage detection 1 circuit enabled). 4. Set the VW1C2 bit to 0 by a program. When 0 is written by a program, this bit is set to 0 (and remains unchanged even if 1 is written to it). 5. The VW1C7 bit is enabled when the VCAC1 bit in the VCAC register is set to 0 (one edge). After setting the VCAC1 bit to 0, set the VW1C7 bit.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before writing the VW1C register. Rewriting the VW1C register may set the VW1C2 bit to 1. Set the VW1C2 bit to 0 after rewriting the VW1C register.
REJ09B0458-0010 Rev.0.10 Page 46 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.2.8
Voltage Monitor 2 Circuit Control Register (VW2C)
b6 -- 0 b5 VW2F1 0 b4 VW2F0 0 b3 VW2C3 0 b2 VW2C2 0 b1 VW2C1 1 b0 VW2C0 0 R/W R/W R/W
Address 003Ah Bit b7 Symbol VW2C7 After Reset 1 Bit b0 b1
b2 b3 b4 b5
b6 b7
Symbol Bit Name Function VW2C0 Voltage monitor 2 interrupt enable bit (1) 0: Disabled 1: Enabled VW2C1 Voltage monitor 2 digital filter 0: Digital filter enable mode (digital filter circuit enabled) disable mode select bit (2) 1: Digital filter disable mode (digital filter circuit disabled) VW2C2 Voltage change detection flag (3, 4) 0: Not detected 1: Vdet2 passing detected VW2C3 WDT detection monitor flag (4) 0: Not detected 1: Detected b5 b4 VW2F0 Sampling clock select bit 0 0: fOCO-S divided by 1 VW2F1 0 1: fOCO-S divided by 2 1 0: fOCO-S divided by 4 1 1: fOCO-S divided by 8 -- Reserved bit Set to 0. VW2C7 Voltage monitor 2 interrupt 0: When VCC or LVCMP2 reaches Vdet2 or above. generation condition select bit (5) 1: When VCC or LVCMP2 reaches Vdet2 or below.
R/W R/W R/W R/W
R/W R/W
Notes: 1. The VW2C0 is enabled when the VCA27 bit in the VCA2 register is set to 1 (voltage detection 2 circuit enabled). Set the VW2C0 bit to 0 (disabled) when the VCA27 bit is set to 0 (voltage detection 2 circuit disabled). To set the VW2C0 bit to 1 (enabled), follow the procedure shown in Table 6.5 Procedure for Setting Bits Associated with Voltage Monitor 2 Interrupt. 2. To use the voltage monitor 2 interrupt to exit stop mode and to return again, write 0 and then 1 to the VW2C1 bit. 3. The VW2C2 bit is enabled when the VCA27 bit in the VCA2 register is set to 1 (voltage detection 2 circuit enabled). 4. Set this bit to 0 by a program. When 0 is written by a program, this bit is set to 0 (and remains unchanged even if 1 is written to it). 5. The VW2C7 bit is enabled when the VCAC2 bit in the VCAC register is set to 0 (one edge). After setting the VCAC2 bit to 0, set the VW2C7 bit.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VW2C register. Rewriting the VW2C register may set the VW2C2 bit to 1. After rewriting this register, set the VW2C2 bit to 0.
REJ09B0458-0010 Rev.0.10 Page 47 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.2.9
Option Function Select Register (OFS)
b6 LVDAS 1 b5 b4 b3 b2 VDSEL1 VDSEL0 ROMCP1 ROMCR 1 1 1 1 b1 -- 1 b0 WDTON 1 (Note 1) R/W R/W R/W R/W R/W R/W R/W
Address 0FFFFh Bit b7 Symbol CSPROINI When shipping 1 Bit b0 b1 b2 b3 b4 b5
Symbol Bit Name WDTON Watchdog timer start select bit -- Reserved bit ROMCR ROM code protect disable bit ROMCP1 ROM code protect bit VDSEL0 Voltage detection 0 level select bit (2) VDSEL1
Function 0: Watchdog timer automatically starts after reset. 1: Watchdog timer is stopped after reset. Set to 1. 0: ROM code protect disabled 1: ROMCP1 bit enabled 0: ROM code protect enabled 1: ROM code protect disabled
b5 b4
b6 b7
LVDAS
Voltage detection 0 circuit start bit (3)
CSPROINI Count source protection mode after reset select bit
0 0: 3.80 V selected (Vdet0_3) 0 1: 2.85 V selected (Vdet0_2) 1 0: 2.35 V selected (Vdet0_1) 1 1: 1.90 V selected (Vdet0_0) 0: Voltage monitor 0 reset enabled after reset 1: Voltage monitor 0 reset disabled after reset 0: Count source protect mode enabled after reset 1: Count source protect mode disabled after reset
R/W R/W
Notes: 1. If the block including the OFS register is erased, the OFS register value is set to FFh. 2. The same level of the voltage detection 0 level selected by bits VDSEL0 and VDESL1 is set in both functions of voltage monitor 0 reset and power-on reset. 3. To use power-on reset, set the LVDAS bit to 0 (voltage monitor 0 reset enabled after reset).
The OFS register is allocated in the flash memory. Write to this register with a program. After writing, do not write additions to this register.
LVDAS Bit (Voltage Detection 0 Circuit Start Bit)
The Vdet0 voltage to be monitored by the voltage detection 0 circuit is selected by bits VDSEL0 and VDSEL1.
REJ09B0458-0010 Rev.0.10 Page 48 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.3 6.3.1
VCC Input Voltage Monitoring Vdet0
Vdet0 cannot be monitored.
6.3.2
Monitoring Vdet1
Once the following settings are made, the comparison result of voltage monitor 1 can be monitored by the VW1C3 bit in the VW1C register after td(E-A) has elapsed (refer to 32. Electrical Characteristics). (1) Set bits VD1S3 to VD1S0 in the VD1LS register (voltage detection 1 detection voltage). (2) Set the VCA21 bit in the VCA2 register to 0 (internal reference voltage). (3) Set the VCA22 bit in the VCA2 register to 0 (VCC voltage). (4) Set the VCA26 bit in the VCA2 register to 1 (voltage detection 1 circuit enabled).
6.3.3
Monitoring Vdet2
Once the following settings are made, the comparison result of voltage monitor 2 can be monitored by the VCA13 bit in the VCA1 register after td(E-A) has elapsed (refer to 32. Electrical Characteristics). (1) Set the VCA23 bit in the VCA2 register to 0 (internal reference voltage). (2) Set the VCA24 bit in the VCA2 register to 0 (VCC voltage), or 1 (LVCMP2 pin input voltage). (3) Set the VCA27 bit in the VCA2 register to 1 (voltage detection 2 circuit enabled).
REJ09B0458-0010 Rev.0.10 Page 49 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.4
Voltage Monitor 0 Reset
Table 6.3 lists the Procedure for Setting Bits Associated with Voltage Monitor 0 Reset and Figure 6.5 shows an Operating Example of Voltage Monitor 0 Reset. To use the voltage monitor 0 reset to exit stop mode, set the VW0C1 bit in the VW0C register to 1 (digital filter disabled). Table 6.3 Step 1 2 3 4 (1) 5 6 7 8 Procedure for Setting Bits Associated with Voltage Monitor 0 Reset When Using Digital Filter When Using No Digital Filter Set the VCA25 bit in the VCA2 register to 1 (voltage detection 0 circuit enabled). Wait for td(E-A). Select the sampling clock of the digital filter by Set the VW0C7 bit in the VW0C register to 1. bits VW0F0 and VW0F1 in the VW0C register. Set the VW0C1 bit in the VW0C register to 0 Set the VW0C1 bit in the VW0C register to 1 (digital filter enabled). (digital filter disabled). Set the VW0C2 bit in the VW0C register to 0. Set the CM14 bit in the CM1 register to 0 - (low-speed on-chip oscillator on). Wait for 4 cycles of the sampling clock of - (No wait time required) the digital filter. Set the VW0C0 bit in the VW0C register to 1 (voltage monitor 0 reset enabled).
Note: 1. When the VW0C0 bit is set to 0, steps 3 and 4 can be executed simultaneously (with one instruction).
VCC Vdet0
Sampling clock of digital filter x 4 cycles VW0C1 bit is set to 0 (digital filter enabled) Internal reset signal
1 x 32 fOCO-S
1 x 32 fOCO-S
VW0C1 bit is set to 1 (digital filter disabled)
Internal reset signal
VW0C1 and VW0C7: Bits in VW0C register The above applies when: * VCA25 bit in VCA2 register = 1 (voltage detection 0 circuit enabled) * VW0C0 bit in VW0C register = 1 (voltage monitor 0 reset enabled) When the internal reset signal is driven low, the pins, CPU, and SFRs are initialized. When the internal reset signal level changes from low to high, a program is executed beginning with the address indicated by the reset vector. Refer to 4. Special Function Registers (SFRs) for the states of the SFRs after reset.
Figure 6.5
Operating Example of Voltage Monitor 0 Reset
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.5
Voltage Monitor 1 Interrupt
Table 6.4 lists the Procedure for Setting Bits Associated with Voltage Monitor 1 Interrupt. Figure 6.6 shows an Operating Example of Voltage Monitor 1 Interrupt. To use the voltage monitor 1 interrupt to exit stop mode, set the VW1C1 bit in the VW1C register to 1 (digital filter disabled). Table 6.4 Step 1 2 3 (1) 4 (1) 5 6 7 (2) 8 9 (3) 10 11 12 13 14 Procedure for Setting Bits Associated with Voltage Monitor 1 Interrupt When Using Digital Filter When Using No Digital Filter Select the voltage detection 1 detection voltage by bits VD1S3 to VD1S0 in the VD1LS register. Set the VCA21 bit in the VCA2 register to 0 (internal reference voltage). Set the VCA22 bit in the VCA2 register to 0 (VCC voltage). Set the VCA26 bit in the VCA2 register to 1 (voltage detection 1 circuit enabled). Wait for td(E-A). Set the COMPSEL bit in the CMPA register to 1. Select the interrupt type by the IRQ1SEL in the CMPA register. Select the sampling clock of the digital filter by Set the VW1C1 bit in the VW1C register to 1 bits VW1F0 and VW1F1 in the VW1C register. (digital filter disabled). Set the VW1C1 bit in the VW1C register to 0 - (digital filter enabled). Select the interrupt request timing by the VCAC1 bit in the VCAC register and the VW1C7 bit in the VW1C register. Set the VW1C2 bit in the VW1C register to 0. Set the CM14 bit in the CM1 register to 0 - (low-speed on-chip oscillator on) Wait for 2 cycles of the sampling clock of - (No wait time required) the digital filter Set the VW1C0 bit in the VW1C register to 1 (voltage monitor 1 interrupt enabled)
Notes: 1. When the VW1C0 bit is set to 0, steps 2, 3 and 4 can be executed simultaneously (with one instruction). 2. When the VW1C0 bit is set to 0, steps 6 and 7 can be executed simultaneously (with one instruction). 3. When the VW1C0 bit is set to 0, steps 8 and 9 can be executed simultaneously (with one instruction).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
VCC Vdet1
1.8 V (1)
1 VW1C3 bit 0 Sampling clock of digital filter x 2 cycles 1 VW1C1 bit is set to 0 (digital filter enabled) and VCAC1 bit is set to 1 (both edges) VW1C2 bit 0 Set to 0 by a program. Set to 0 when an interrupt request is acknowledged. Sampling clock of digital filter x 2 cycles
Voltage monitor 1 interrupt request
VW1C1 bit is set to 0 (digital filter enabled), VCAC1 bit is set to 0 (one edge), and VW1C7 bit is set to 0 (when VCC reaches Vdet1 or above)
1 VW1C2 bit 0 Voltage monitor 1 interrupt request
Set to 0 by a program.
Set to 0 when an interrupt request is acknowledged.
VW1C1 bit is set to 0 (digital filter enabled), VCAC1 bit is set to 0 (one edge), and VW1C7 bit is set to 1 (when VCC reaches Vdet1 or below)
1 VW1C2 bit 0 Voltage monitor 1 interrupt request
Set to 0 by a program.
Set to 0 when an interrupt request is acknowledged.
Set to 0 by a program. 1 VW1C1 bit is set to 1 (digital filter disabled) and VCAC1 bit is set to 1 (both edges) VW1C2 bit 0 Voltage monitor 1 interrupt request Set to 0 when an interrupt request is acknowledged.
Set to 0 by a program. VW1C1 bit is set to 1 (digital filter disabled), VCAC1 bit is set to 0 (one edge), and VW1C7 bit is set to 0 (when VCC reaches Vdet1 or above) 1 VW1C2 bit 0 Voltage monitor 1 interrupt request Set to 0 when an interrupt request is acknowledged.
VW1C1 bit is set to 1 (digital filter disabled), VCAC1 bit is set to 0 (one edge), and VW1C7 bit is set to 1 (when VCC reaches Vdet1 or below)
Set to 0 by a program. 1 VW1C2 bit 0 Voltage monitor 1 interrupt request Set to 0 when an interrupt request is acknowledged.
VW1C1, VW1C2, VW1C3, VW1C7: Bits in VW1C register VCAC1: Bit in VCAC register The above applies when: * VCA26 bit in VCA2 register = 1 (voltage detection 1 circuit enabled) * VW1C0 bit in VW1C register = 1 (voltage monitor 1 interrupt enabled) Note: 1. If voltage monitor 0 reset is not used, set the power supply to VCC 1.8 V.
Figure 6.6
Operating Example of Voltage Monitor 1 Interrupt
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
6.6
Voltage Monitor 2 Interrupt
Table 6.5 lists the Procedure for Setting Bits Associated with Voltage Monitor 2 Interrupt. Figure 6.7 shows an Operating Example of Voltage Monitor 2 Interrupt. To use the voltage monitor 2 interrupt to exit stop mode, set the VW2C1 bit in the VW2C register to 1 (digital filter disabled). Table 6.5 Step 1 2 (1) 3 (1) 4 5 6 (2) 7 8 (3) 9 10 11 12 13 Procedure for Setting Bits Associated with Voltage Monitor 2 Interrupt When Using Digital Filter When Using No Digital Filter Set the VCA23 bit in the VCA2 register to 0 (internal reference voltage). Set the VCA24 bit in the VCA2 register to 0 (VCC voltage) or 1 (LCVCMP2 pin input voltage). Set the VCA27 bit in the VCA2 register to 1 (voltage detection 2 circuit enabled). Wait for td(E-A). Set the COMPSEL bit in the CMPA register to 1. Select the interrupt type by the IRQ2SEL in the CMPA register. Select the sampling clock of the digital filter by Set the VW2C1 bit in the VW2C register to 1 bits VW2F0 and VW2F1 in the VW2C register. (digital filter disabled). Set the VW2C1 bit in the VW2C register to 0 - (digital filter enabled). Select the interrupt request timing by the VCAC2 bit in the VCAC register and the VW2C7 bit in the VW2C register. Set the VW2C2 bit in the VW2C register to 0. Set the CM14 bit in the CM1 register to 0 - (low-speed on-chip oscillator on). Wait for 2 cycles of the sampling clock of - (No wait time required) the digital filter. Set the VW2C0 bit in the VW2C register to 1 (voltage monitor 2 interrupt enabled).
Notes: 1. When the VW2C0 bit is set to 0, steps 1, 2 and 3 can be executed simultaneously (with one instruction). 2. When the VW2C0 bit is set to 0, steps 5 and 6 can be executed simultaneously (with one instruction). 3. When the VW2C0 bit is set to 0, steps 7 and 8 can be executed simultaneously (with one instruction).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
6. Voltage Detection Circuit
VCC or LVCMP2 Vdet2
1.8 V (1)
1 VW1C3 bit 0 Sampling clock of digital filter x 2 cycles 1 VW2C1 bit is set to 0 (digital filter enabled) and VCAC2 bit is set to 1 (both edges) VW2C2 bit 0 Set to 0 by a program. Set to 0 when an interrupt request is acknowledged. Sampling clock of digital filter x 2 cycles
Voltage monitor 2 interrupt request
VW2C1 bit is set to 0 (digital filter enabled), VCAC2 bit is set to 0 (one edge), and VW2C7 bit is set to 0 (when VCC or LVCMP2 reaches Vdet2 or above)
1 VW2C2 bit 0 Voltage monitor 2 interrupt request
Set to 0 by a program.
Set to 0 when an interrupt request is acknowledged.
VW2C1 bit is set to 0 (digital filter enabled), VCAC2 bit is set to 0 (one edge), and VW2C7 bit is set to 1 (when VCC or LVCMP2 reaches Vdet2 or below)
1 VW2C2 bit 0 Voltage monitor 2 interrupt request
Set to 0 by a program.
Set to 0 when an interrupt request is acknowledged.
Set to 0 by a program. 1 VW2C1 bit is set to 1 (digital filter disabled) and VCAC2 bit is set to 1 (both edges) VW2C2 bit 0 Voltage monitor 2 interrupt request Set to 0 when an interrupt request is acknowledged.
Set to 0 by a program. VW2C1 bit is set to 1 (digital filter disabled), VCAC2 bit is set to 0 (one edge), and VW2C7 bit is set to 0 (when VCC or LVCMP2 reaches Vdet2 or above) 1 VW2C2 bit 0 Voltage monitor 2 interrupt request Set to 0 when an interrupt request is acknowledged.
VW2C1 bit is set to 1 (digital filter disabled), VCAC2 bit is set to 0 (one edge), and VW2C7 bit is set to 1 (when VCC or LVCMP2 reaches Vdet2 or below)
1 VW2C2 bit 0 Voltage monitor 2 interrupt request
Set to 0 by a program.
Set to 0 when an interrupt request is acknowledged.
VCA13: Bit in VCA1 register VW2C1, VW2C2, VW2C3, VW2C7: Bits in VW2C register VCAC2: Bit in VCAC register The above applies when: * VCA27 bit in VCA2 register = 1 (voltage detection 2 circuit enabled) * VW2C0 bit in VW2C register = 1 (voltage monitor 2 interrupt enabled) Note: 1. If voltage monitor 0 reset is not used, set the power supply to VCC 1.8 V.
Figure 6.7
Operating Example of Voltage Monitor 2 Interrupt
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R8C/32A Group
7. I/O Ports
7.
I/O Ports
There are 15 I/O ports P1, P3_3 to P3_5, P3_7, and P4_5 to P4_7 (P4_6 and P4_7 can be used as I/O ports if the XIN clock oscillation circuit and the XCIN clock oscillation circuit are not used.). If the A/D converter is not used, P4_2 can be used as an input-only port. Table 7.1 lists an Overview of I/O Ports. Table 7.1
Ports P1 P3_3 P3_4, P3_5, P3_7 P4_5, P4_6 (5), P4_7 (5) P4_2 (6)
Overview of I/O Ports
I/O Type of Output I/O CMOS3 state I/O CMOS3 state I/O CMOS3 state I/O CMOS3 state I (No output function) I/O Setting Internal Pull-Up Resister Drive Capacity Switch Input Level Switch
Set in 1-bit units Set in 4-bit units (1) Set in 1-bit units (2) Set in 8-bit units (4) Set in 1-bit units Set in 1-bit units (1) Set in 1-bit units (3) Set in 4-bit units (4) Set in 1-bit units Set in 3-bit units (1) Set in 3-bit units (3) Set in 1-bit units Set in 3-bit units (1) Set in 3-bit units (3) Set in 4-bit units (4) None None None
Notes: 1. In input mode, whether an internal pull-up resistor is connected or not can be selected by registers PUR0 and PUR1. 2. Whether the drive capacity of the output transistor is set to low or high can be selected using the P1DRR register. 3. Whether the drive capacity of the output transistor is set to low or high can be selected using registers DRR0 and DRR1. 4. The input threshold value can be selected among three voltage levels (0.35 VCC, 0.50 VCC, and 0.70 VCC) using registers VLT0 and VLT1. 5. When the XIN clock oscillation circuit and the XCIN clock oscillation circuit are not used, these ports can be used as I/O ports. 6. When the A/D converter is not used, this port can be used as an input-only ports.
7.1
Functions of I/O Ports
The PDi_j (j = 0 to 7) bit in the PDi (i = 1, 3, 4) register controls I/O of the ports P1, P3_3 to P3_5, P3_7, and P4_5 to P4_7. The Pi register consists of a port latch to hold output data and a circuit to read pin states. Figures 7.1 to 7.7 show the Configurations of I/O Ports. Table 7.2 lists the Functions of I/O Ports. Table 7.2 Functions of I/O Ports
Operation When Value of PDi_j Bit in PDi Register (1) Accessing When PDi_j Bit is Set to 0 (Input Mode) When PDi_j Bit is Set to 1 (Output Mode) Pi Register Read Read the pin input level. Read the port latch. Write to the port latch. The value written to Write Write to the port latch. the port latch is output from the pin. i = 1, 3, 4, j = 0 to 7 Note: 1. Nothing is assigned to bits PD4_0 to PD4_2. Also, bits PD3_0 to PD3_2, PD3_6, PD4_3, and PD4_4 are reserved bits.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.2
Effect on Peripheral Functions
I/O ports function as I/O ports for peripheral functions (Refer to Table 1.4 Pin Name Information by Pin Number). Table 7.3 lists the Setting of PDi_j Bit when Functioning as I/O Ports for Peripheral Functions (i = 1, 3, 4, j = 0 to 7). Refer to the description of each function for information on how to set peripheral functions. Table 7.3 Setting of PDi_j Bit when Functioning as I/O Ports for Peripheral Functions (i = 1, 3, 4, j = 0 to 7)
I/O of Peripheral Function PDi_j Bit Settings for Shared Pin Function Input Set this bit to 0 (input mode). Output This bit can be set to either 0 or 1 (output regardless of the port setting).
7.3
Pins Other than I/O Ports
Figure 7.8 shows the Configuration of I/O Pins.
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7. I/O Ports
P1_0 to P1_2
Pull-up selection Direction register
Drive capacity selection
Pin select register
1
Output from individual peripheral function
(Note 1)
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function Analog input of A/D converter Analog input of comparator A
Drive capacity selection
P1_3
Pull-up selection Direction register
Drive capacity selection
Pin select register
1
Output from individual peripheral function
(Note 1)
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function Analog input of A/D converter
Drive capacity selection Note: 1.
symbolizes a parasitic diode. Ensure the input voltage to each port does not exceed VCC.
Figure 7.1
Configuration of I/O Ports (1)
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7. I/O Ports
P1_4
Pull-up selection Direction register
Drive capacity selection
Pin select register
1
Output from individual peripheral function
(Note 1)
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function
Drive capacity selection
P1_5
Pull-up selection Direction register
Drive capacity selection
Pin select register
1
Output from individual peripheral function
(Note 1)
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function Input to external interrupt Digital filter Drive capacity selection
Note: 1.
symbolizes a parasitic diode. Ensure the input voltage to each port does not exceed VCC.
Figure 7.2
Configuration of I/O Ports (2)
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R8C/32A Group
7. I/O Ports
P1_6
Pull-up selection Direction register
Drive capacity selection
Pin select register
1
Output from individual peripheral function
(Note 1)
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function
Analog input of comparator B
Drive capacity selection
P1_7
Pull-up selection Direction register
Drive capacity selection
Pin select register
1
Output from individual peripheral function
(Note 1)
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function Analog input of comparator B Input to external interrupt Digital filter Drive capacity selection
Note: 1.
symbolizes a parasitic diode. Ensure the input voltage to each port does not exceed VCC.
Figure 7.3
Configuration of I/O Ports (3)
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7. I/O Ports
P3_3
Pull-up selection Direction register
Drive capacity selection
Pin select register
1
Output from individual peripheral function
(Note 1)
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function Analog input of comparator B Input to external interrupt Digital filter Drive capacity selection
P3_4
Pull-up selection Direction register
Drive capacity selection
Pin select register
1 (Note 1)
Output from individual peripheral function
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function
Analog input of comparator B
Drive capacity selection
Note: 1.
symbolizes a parasitic diode. Ensure the input voltage to each port does not exceed VCC.
Figure 7.4
Configuration of I/O Ports (4)
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7. I/O Ports
P3_5
Pull-up selection Direction register
Drive capacity selection
Pin select register
1 (Note 1)
Output from individual peripheral function
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function
Drive capacity selection
P3_7
Pull-up selection Direction register
Drive capacity selection
Pin select register
1 (Note 1)
Output from individual peripheral function
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function
Drive capacity selection
Note: 1.
symbolizes a parasitic diode. Ensure the input voltage to each port does not exceed VCC.
Figure 7.5
Configuration of I/O Ports (5)
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R8C/32A Group
7. I/O Ports
P4_2/VREF
(Note 1) Data bus Input level switch function (Note 1)
P4_5
Pull-up selection Direction register
Drive capacity selection
Pin select register
1 (Note 1)
Output from individual peripheral function
Data bus
Port latch (Note 1)
Input level switch function Pin select register Input to individual peripheral function Input to external interrupt A/D trigger input Digital filter Drive capacity selection
Note: 1.
symbolizes a parasitic diode. Ensure the input voltage to each port does not exceed VCC.
Figure 7.6
Configuration of I/O Ports (6)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
P4_6/XIN/XCIN
Drive capacity selection
Pull-up selection
Direction register
(Note 1)
Data bus
Port latch
(Note 1)
CM01
Input level switch function
CM13
0
1
CM04, CM13
Drive capacity selection
CM11
CM12
XIN oscillation circuit
CM05
RfXIN
CM03
RfXCIN
XCIN oscillation circuit
P4_7/XOUT/XCOUT
Pull-up selection
Direction register
Drive capacity selection
0
1
CM01
(Note 1)
Data bus
Port latch
(Note 1)
Input level switch function
Drive capacity selection
Note: 1.
symbolizes a parasitic diode. Ensure the input voltage to each port does not exceed VCC.
CM01, CM03, CM04, CM05: Bits in CM0 register CM11, CM12, CM13: Bits in CM1 register
Figure 7.7
Configuration of I/O Ports (7)
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R8C/32A Group
7. I/O Ports
MODE
MODE signal input (Note 1)
RESET
RESET signal input
(Note 1)
(Note 1)
Note: 1.
symbolizes a parasitic diode. Ensure the input voltage to each port does not exceed VCC.
Figure 7.8
Configuration of I/O Pins
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R8C/32A Group
7. I/O Ports
7.4 7.4.1
Registers Port Pi Direction Register (PDi) (i = 1, 3, 4)
b7 PDi_7 0 b6 PDi_6 0 b5 PDi_5 0 b4 PDi_4 0 b3 PDi_3 0 b2 PDi_2 0 b1 PDi_1 0 b0 PDi_0 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 00E3h (PD1), 00E7h (PD3 (1)), 00EAh (PD4 (2)) Bit Symbol After Reset Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol PDi_0 PDi_1 PDi_2 PDi_3 PDi_4 PDi_5 PDi_6 PDi_7
Bit Name Port Pi_0 direction bit Port Pi_1 direction bit Port Pi_2 direction bit Port Pi_3 direction bit Port Pi_4 direction bit Port Pi_5 direction bit Port Pi_6 direction bit Port Pi_7 direction bit
Function 0: Input mode (functions as an input port) 1: Output mode (functions as an output port)
Notes: 1. Bits PD3_0 to PD3_2 and PD3_6 in the PD3 register are reserved bits. If it is necessary to set bits PD3_0 to PD3_2 and PD3_6, set to 0. When read, the content is 0. 2. Bits PD4_0 to PD4_2 in the PD4 register are unavailable on this MCU. If it is necessary to set bits PD4_0 to PD4_2 set to 0. When read, the content is 0. Bits PD4_3, PD4_4 are reserved bits. If it is necessary to set bits PD4_3 and PD4_4, set to 0. When read, the content is 0.
The PDi register selects whether I/O ports are used for input or output. Each bit in the PDi register corresponds to one port.
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R8C/32A Group
7. I/O Ports
7.4.2
Bit Symbol After Reset Bit b0 b1 b2 b3 b4 b5 b6 b7
Port Pi Register (Pi) (i = 1, 3, 4)
b7 Pi_7 X b6 Pi_6 X b5 Pi_5 X Bit Name Port Pi_0 bit Port Pi_1 bit Port Pi_2 bit Port Pi_3 bit Port Pi_4 bit Port Pi_5 bit Port Pi_6 bit Port Pi_7 bit 0: "L" level 1: "H" level b4 Pi_4 X b3 Pi_3 X b2 Pi_2 X b1 Pi_1 X Function b0 Pi_0 X R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 00E1h(P1), 00E5h(P3 (1)), 00E8h(P4 (2))
Symbol Pi_0 Pi_1 Pi_2 Pi_3 Pi_4 Pi_5 Pi_6 Pi_7
Notes: 1. Bits P3_0 to P3_2 and P3_6 in the P3 register are reserved bits. If it is necessary to set bits P3_0 to P3_2 and P3_6, set to 0. When read, the content is 0. 2. Bits P4_0 to P4_1 in the P4 register are unavailable on this MCU. If it is necessary to set bits P4_0 to P4_1 set to 0. When read, the content is 0. Bits P4_3, P4_4 are reserved bits. If it is necessary to set bits P4_3 and P4_4, set to 0. When read, the content is 0.
Data input and output to and from external devices are accomplished by reading and writing to the Pi register. The Pi register consists of a port latch to retain output data and a circuit to read the pin status. The value written in the port latch is output from the pin. Each bit in the Pi register corresponds to one port.
Pi_j Bit (i = 1, 3, 4, j = 0 to 7) (Port Pi_j Bit)
The pin level of any I/O port which is set to input mode can be read by reading the corresponding bit in this register. The pin level of any I/O port which is set to output mode can be controlled by writing to the corresponding bit in this register.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.3
Timer RA Pin Select Register (TRASR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 b0 TRAIOSEL1 TRAIOSEL0 0 0 Function
b1 b0
Address 0180h Bit b7 Symbol -- After Reset 0 Bit b0 b1
Symbol Bit Name TRAIOSEL0 TRAIO pin select bit TRAIOSEL1
b2 b3 b4 b5 b6 b7
-- -- -- -- -- --
Reserved bits
0 0: TRAIO pin not used 0 1: P1_7 assigned 1 0: P1_5 assigned 1 1: Do not set. Set to 0.
R/W R/W R/W
R/W
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
--
The TRASR register selects which pin is assigned to the timer RA I/O. To use the I/O pin for timer RA, set this register. Set the TRASR register before setting the timer RA associated registers. Also, do not change the setting value in this register during timer RA operation.
7.4.4
Timer RC Pin Select Register (TRBRCSR)
b6 -- 0 b5 b4 TRCCLKSEL1 TRCCLKSEL0 0 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 -- 0 R/W R/W -- R/W R/W
Address 0181h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5
b6 b7
Symbol Bit Name Function -- Reserved bits Set to 0. -- -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- b5 b4 TRCCLKSEL0 TRCCLK pin select bit 0 0: TRCCLK pin not used TRCCLKSEL1 0 1: P1_4 assigned 1 0: P3_3 assigned 1 1: Do not set. -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0.
R/W --
The TRBRCSR register selects which pin is assigned to the timer RC I/O. To use the I/O pin for timer RC, set this register. Set bits TRCCLKSEL0 and TRCCLKSEL1 before setting the timer RC associated registers. Also, do not change the setting values of bits TRCCLKSEL0 and TRCCLKSEL1 during timer RC operation.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.5
Timer RC Pin Select Register 0 (TRCPSR0)
b6 -- 0 b5 -- 0 b4 TRCIOBSEL0 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 TRCIOASEL0 0 R/W R/W R/W -- R/W R/W --
Address 0182h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name TRCIOASEL0 TRCIOA/TRCTRG pin select bit
-- Reserved bits -- -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. TRCIOBSEL0 TRCIOB pin select bit 0: TRCIOB pin not used 1: P1_2 assigned -- Reserved bits Set to 0. -- -- Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Function 0: TRCIOA/TRCTRG pin not used 1: P1_1 assigned Set to 0.
The TRCPSR0 register selects which pin is assigned to the timer RC I/O. To use the I/O pin for timer RC, set this register. Set the TRCPSR0 register before setting the timer RC associated registers. Also, do not change the setting value in this register during timer RC operation.
7.4.6
Timer RC Pin Select Register 1 (TRCPSR1)
b6 -- 0 b5 b4 b3 -- 0 b2 -- 0 b1 b0
Address 0183h Bit b7 Symbol -- After Reset 0 Bit b0 b1
TRCIODSEL1 TRCIODSEL0 0 0
TRCIOCSEL1 TRCIOCSEL0 0 0 Function R/W R/W R/W
b2 b3 b4 b5
b6 b7
0 0: TRCIOC pin not used 0 1: P1_3 assigned 1 0: P3_4 assigned 1 1: Do not set. -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. b5 b4 TRCIODSEL0 TRCIOD pin select bit 0 0: TRCIOD pin not used TRCIODSEL1 0 1: P1_0 assigned 1 0: P3_5 assigned 1 1: Do not set. -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Symbol Bit Name TRCIOCSEL0 TRCIOC pin select bit TRCIOCSEL1
b1 b0
R/W -- R/W R/W
R/W --
The TRCPSR1 register selects which pin is assigned to the timer RC I/O. To use the I/O pin for timer RC, set this register. Set the TRCPSR1 register before setting the timer RC associated registers. Also, do not change the setting value in this register during timer RC operation.
REJ09B0458-0010 Rev.0.10 Page 68 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.7
UART0 Pin Select Register (U0SR)
b6 -- 0 b5 -- 0 b4 CLK0SEL0 0 b3 -- 0 b2 RXD0SEL0 0 b1 -- 0 b0 TXD0SEL0 0 R/W R/W -- R/W -- R/W --
Address 0188h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Function 0: TXD0 pin not used 1: P1_4 assigned -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. RXD0SEL0 RXD0 pin select bit 0: RXD0 pin not used 1: P1_5 assigned -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. CLK0SEL0 CLK0 pin select bit 0: CLK0 pin not used 1: P1_6 assigned -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- --
Symbol Bit Name TXD0SEL0 TXD0 pin select bit
The U0SR register selects which pin is assigned to the UART0 I/O. To use the I/O pin for UART0, set this register. Set the U0SR register before setting the UART0 associated registers. Also, do not change the setting value in this register during UART0 operation.
REJ09B0458-0010 Rev.0.10 Page 69 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.8
UART2 Pin Select Register 0 (U2SR0)
b6 -- 0 b5 b4 RXD2SEL1 RXD2SEL0 0 0 b3 -- 0 b2 -- 0 b1 b0 TXD2SEL1 TXD2SEL0 0 0 Function
b1 b0
Address 018Ah Bit b7 Symbol -- After Reset 0 Bit b0 b1
b2 b3 b4 b5
b6 b7
0 0: TXD2/SDA2 pin not used 0 1: P3_7 assigned 1 0: P3_4 assigned 1 1: Do not set. -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. b5 b4 RXD2SEL0 RXD2/SCL2 pin select bit 0 0: RXD2/SCL2 pin not used RXD2SEL1 0 1: P3_4 assigned 1 0: P3_7 assigned 1 1: P4_5 assigned -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Symbol Bit Name TXD2SEL0 TXD2/SDA2 pin select bit TXD2SEL1
R/W R/W R/W
R/W -- R/W R/W
R/W --
The U2SR0 register selects which pin is assigned to the UART2 I/O. To use the I/O pin for UART2, set this register. Set the U2SR0 register before setting the UART2 associated registers. Also, do not change the setting value in this register during UART2 operation.
7.4.9
UART2 Pin Select Register 1 (U2SR1)
b6 -- 0 b5 -- 0 b4 CTS2SEL0 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 CLK2SEL0 0 R/W R/W R/W -- R/W R/W -- R/W
Address 018Bh Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name CLK2SEL0 CLK2 pin select bit
-- -- -- CTS2SEL0 CTS2/RTS2 pin select bit -- -- --
Function 0: CLK2 pin not used 1: P3_5 assigned Reserved bit Set to 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0.
0: CTS2/RTS2 pin not used 1: P3_3 assigned Reserved bit Set to 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0. Reserved bit Set to 0.
The U2SR1 register selects which pin is assigned to the UART2 I/O. To use the I/O pin for UART2, set this register. Set the U2SR1 register before setting the UART2 associated registers. Also, do not change the setting value in this register during UART2 operation.
REJ09B0458-0010 Rev.0.10 Page 70 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.10
SSU/IIC Pin Select Register (SSUIICSR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 IICSEL 0 R/W R/W R/W -- R/W
Address 018Ch Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol IICSEL -- -- -- -- -- -- --
Bit Name SSU/I2C bus switch bit
Function 0: SSU function selected 1: I2C bus function selected Reserved bit Set to 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0. Set to 0.
Reserved bits
7.4.11
INT Interrupt Input Pin Select Register (INTSR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 INT1SEL0 0 b0 -- 0 R/W -- R/W R/W
Address 018Eh Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. INT1SEL0 INT1 pin select bit 0: P1_7 assigned 1: P1_5 assigned -- Reserved bits Set to 0. -- -- -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- Reserved bits Set to 0. --
-- R/W
The INTSR register selects which pin is assigned to the INT1 input. To use INT1, set this register. Set the INTSR register before setting the INT1 associated registers. Also, do not change the setting values in this register during INT1 operation.
REJ09B0458-0010 Rev.0.10 Page 71 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.12
Pull-Up Control Register 0 (PUR0)
b6 PU06 0 b5 -- 0 b4 -- 0 b3 PU03 0 b2 PU02 0 b1 -- 0 Function Set to 0. 0: Not pulled up 1: Pulled up (1) Set to 0. 0: Not pulled up 1: Pulled up (1) b0 -- 0 R/W R/W R/W R/W R/W R/W R/W
Address 01E0h Bit b7 Symbol PU07 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol -- -- PU02 PU03 -- -- PU06 PU07
Bit Name Reserved bits P1_0 to P1_3 pull-up P1_4 to P1_7 pull-up Reserved bits P3_3 pull-up P3_4, P3_5, P3_7 pull-up
Note: 1. When this bit is set to 1 (pulled up), the pin whose port direction bit is set to 0 (input mode) is pulled up.
For ports set to output as I/O pins for peripheral functions, the setting values in the PUR0 register are invalid and no pull-up resistor is connected.
7.4.13
Pull-Up Control Register 1 (PUR1)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 PU11 0 Function Set to 0. 0: Not pulled up 1: Pulled up (1) Set to 0. b0 -- 0 R/W R/W R/W R/W
Address 01E1h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name -- Reserved bit PU11 P4_5 to P4_7 pull-up -- -- -- -- -- -- Reserved bits
Nothing is assigned. If necessary, set to 0. When read, the content is undefined.
--
Note: 1. When this bit is set to 1 (pulled up), the pin whose port direction bit is set to 0 (input mode) is pulled up.
For ports set to output as I/O pins for peripheral functions, the setting values in the PUR1 register are invalid and no pull-up resistor is connected.
REJ09B0458-0010 Rev.0.10 Page 72 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.14
Port P1 Drive Capacity Control Register (P1DRR)
Address 01F0h Bit b7 b6 b5 b4 b3 b2 b1 b0 Symbol P1DRR7 P1DRR6 P1DRR5 P1DRR4 P1DRR3 P1DRR2 P1DRR1 P1DRR0 After Reset 0 0 0 0 0 0 0 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol P1DRR0 P1DRR1 P1DRR2 P1DRR3 P1DRR4 P1DRR5 P1DRR6 P1DRR7 Bit Name P1_0 drive capacity P1_1 drive capacity P1_2 drive capacity P1_3 drive capacity P1_4 drive capacity P1_5 drive capacity P1_6 drive capacity P1_7 drive capacity Function 0: Low 1: High (1) R/W R/W R/W R/W R/W R/W R/W R/W R/W
Note: 1. Both "H" and "L" output are set to high drive capacity.
The P1DRR register selects whether the drive capacity of the P1 output transistor is set to low or high. The P1DRRi bit (i = 0 to 7) is used to select whether the drive capacity of the output transistor is set to low or high for each pin.
REJ09B0458-0010 Rev.0.10 Page 73 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.15
Drive Capacity Control Register 0 (DRR0)
b6 DRR06 0 b5 -- 0 Bit Name Reserved bits Set to 0. b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 Function b0 -- 0 R/W R/W --
Address 01F2h Bit b7 Symbol DRR07 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol -- -- -- -- -- -- DRR06 DRR07
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
P3_3 drive capacity P3_4, P3_5, P3_7 drive capacity
0: Low 1: High (1)
R/W R/W
Note: 1. Both "H" and "L" output are set to high drive capacity.
DRR06 Bit (P3_3 drive capacity)
The DRR06 bit selects whether the drive capacity of the P3_3 output transistors is set to low or high. This bit is used to select whether the drive capacity of the output transistors is set to low or high for this pin.
DRR07 Bit (P3_4, P3_5, P3_7 drive capacity)
The DRR07 bit selects whether the drive capacity of the P3_4, P3_5, P3_7 output transistors is set to low or high. This bit is used to select whether the drive capacity of the output transistors is set to low or high for three pins.
REJ09B0458-0010 Rev.0.10 Page 74 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.16
Drive Capacity Control Register 1 (DRR1)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 DRR11 0 b0 -- 0 R/W R/W R/W -- R/W
Address 01F3h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name -- Reserved bit DRR11 P4_5 to P4_7 drive capacity -- -- -- -- -- --
Function Set to 0. 0: Low 1: High (1) Nothing is assigned. If necessary, set to 0. When read, the content is 0. Reserved bits Set to 0.
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
--
Note: 1. Both "H" and "L" output are set to high drive capacity.
DRR11 Bit (P4_5 to P4_7 drive capacity)
The DRR11 bit selects whether the drive capacity of the P4_5 to P4_7 output transistors is set to low or high. This bit is used to select whether the drive capacity of the output transistors is set to low or high for four pins.
REJ09B0458-0010 Rev.0.10 Page 75 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.4.17
Input Threshold Control Register 0 (VLT0)
b6 VLT06 0 b5 -- 0 b4 -- 0 b3 VLT03 0 b2 VLT02 0 b1 -- 0 Function Set to 0.
b3 b2
Address 01F5h Bit b7 Symbol VLT07 After Reset 0 Bit b0 b1 b2 b3
b0 -- 0 R/W R/W R/W R/W
Symbol Bit Name -- Reserved bits -- VLT02 P1 input level select bit VLT03
b4 b5 b6 b7
-- -- VLT06 VLT07
Reserved bits P3_3 to P3_5, P3_7 input level select bit
0 0: 0.50 x VCC 0 1: 0.35 x VCC 1 0: 0.70 x VCC 1 1: Do not set. Set to 0.
b7 b6
R/W R/W R/W
0 0: 0.50 x VCC 0 1: 0.35 x VCC 1 0: 0.70 x VCC 1 1: Do not set.
The VLT0 register selects the voltage level of the input threshold values for ports P1, P3_3 to P3_5, and P3_7. Bits VLT02 to VLT03 and bits VLT06 to VLT07 are used to select the input threshold values among three voltage levels (0.35 VCC, 0.50 VCC, and 0.70 VCC).
7.4.18
Input Threshold Control Register 1 (VLT1)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 VLT11 0 Function
b1 b0
Address 01F6h Bit b7 Symbol -- After Reset 0 Bit b0 b1
b0 VLT10 0 R/W R/W R/W
Symbol Bit Name VLT10 P4_2, P4_5 to P4_7 input level select VLT11 bit
b2 b3 b4 b5 b6 b7
-- -- -- -- -- --
Reserved bits
0 0: 0.50 x VCC 0 1: 0.35 x VCC 1 0: 0.70 x VCC 1 1: Do not set. Set to 0.
R/W
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
--
The VLT1 register selects the voltage level of the input threshold values for ports P4_2 and P4_5 to P4_7. Bits VLT10 to VLT15 are used to select the input threshold values among three voltage levels (0.35 VCC, 0.50 VCC, and 0.70 VCC).
REJ09B0458-0010 Rev.0.10 Page 76 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.5
Port Settings
Tables 7.4 to 7.24 list the port settings. Table 7.4
Register Bit PD1 PD1_0 0 1 0 Setting Value 0 0 X 0
Port P1_0/KI0/AN8/TRCIOD/LVCMP1
KIEN KI0EN X X 1 0 X X 0 ADINSEL CH ADGSEL 210 1 0 X X X 0 X X X X X X 0 X X X X X X 0 X X X X X X 0 X X X X X X 1 X X X TRCPSR1 TRCIODSEL 1 0 Other than 01b Other than 01b Other than 01b Other than 01b 0 0 1 1 VCA2 VCA22 X X X X X X 1 Timer RC Setting -- X X X X Refer to Table 7.24 TRCIOD Pin Setting Refer to Table 7.24 TRCIOD Pin Setting X Function
Input port (1) Output port (2) KI0 input (1)
A/D converter input (AN8) (1)
TRCIOD input (1) TRCIOD output (2) Comparator A1 input (LVCMP1)
Other than 01b
X: 0 or 1 Notes: 1. Pulled up by setting the PU02 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the P1DRR0 bit in the P1DRR register to 1.
Table 7.5
Register Bit PD1
Port P1_1/KI1/AN9/TRCIOA/TRCTRG/LVCMP2
KIEN KI1EN X X 1 ADINSEL CH ADGSEL 210 1 0 X X X 0 X X X X X X 0 X X X X X X 1 X X X X X X 0 X X X X X X 1 X X X TRCPSR0 TRCIOASEL0 0 0 0 0 1 1 0 VCA2 VCA24 X X X X X X 1 Timer RC Setting -- X X X X Refer to Table 7.21 TRCIOA Pin Setting Refer to Table 7.21 TRCIOA Pin Setting X Function Input port (1) Output port (2) KI1 input (1)
A/D converter input (AN9) (1)
PD1_1 0 1
Setting Value
0 0 X 0
0 X X 0
TRCIOA input (1) TRCIOA output (2) Comparator A2 input (LVCMP2)
X: 0 or 1 Notes: 1. Pulled up by setting the PU02 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the P1DRR1 bit in the P1DRR register to 1.
REJ09B0458-0010 Rev.0.10 Page 77 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
Table 7.6
Register Bit PD1
Port P1_2/KI2/AN10/TRCIOB/LVREF
KIEN ADINSEL CH 210 X X X 0 X X X X 1 X X X X 0 X TRCPSR0 VCA2 Timer RC Setting -- X X X X Refer to Table 7.22 TRCIOB Pin Setting Refer to Table 7.22 TRCIOB Pin Setting X X Input port (1) Output port (2) KI2 input (1)
A/D converter input (AN10) (1)
PD1_2 KI2EN 0 1 0 0 0 X X 1 0 X
ADGSEL TRCIOBSEL0 VCA21 VCA23 1 0 X X X 0 X X X X 1 X 0 0 0 0 1 X X X X X X X X X X
Function
Setting Value
TRCIOB input (1)
X 0 0
X 0 0
X X X
X X X
X X X
X X X
X X X
1 0 0
X 1 X
X X 1
TRCIOB output (2) Comparator A1 reference voltage input (LVREF) Comparator A2 reference voltage input (LVREF)
X: 0 or 1 Notes: 1. Pulled up by setting the PU02 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the P1DRR2 bit in the P1DRR register to 1.
Table 7.7
Register Bit PD1
Port P1_3/KI3/AN11/TRCIOC/LVCOUT1
KIEN
Setting Value
ADINSEL TRCPSR1 ACMR Timer RB Setting Timer RC Setting ADGSEL TRCIOCSEL CH Function CM10E -- -- PD1_3 KI3EN 210 1 0 1 0 Other than Other than TRBO 0 X XXX X X 0 X Input port (1) 01b usage conditions Other than TRBO Other than X 0 1 X XXX X X Output port (2) usage conditions 01b Other than Other than TRBO 0 1 XXX X X 0 X KI3 input (1) 01b usage conditions A/D converter Other than TRBO Other than X 0 0 0 011 0 1 usage conditions 01b input (AN11) (1) Refer to Table 7.20 TRBO Pin X X XXX X X X X 0 X TRBO output (2) Setting Refer to Table Other than TRBO 7.22 TRCIOB 0 X XXX X X 0 1 0 TRCIOC input (1) usage conditions Pin Setting Refer to Table Other than TRBO 7.22 TRCIOB X X XXX X X 0 1 0 TRCIOC output (2) usage conditions Pin Setting Comparator A1 X X XXX X X X X 1 X X output (LVCOUT1)
X: 0 or 1 Notes: 1. Pulled up by setting the PU02 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the P1DRR3 bit in the P1DRR register to 1.
REJ09B0458-0010 Rev.0.10 Page 78 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
Table 7.8
Register Bit
Port P1_4/TXD0/TRCCLK
PD1 PD1_4 0 1 U0SR TXD0SEL0 0 0 2 X X 0 X 1 0 1 1 0 0 X X U1MR SMD 1 X X TRBRCSR TRCCLKSEL 1 0 X X X X TRCCR1 TCK 1 X X Function 0 X X Input port (1) Output port (2)
0 X X 1 0 1 0 X
2 X X
Setting Value
X
X
X
X
X
TXD0 output (2, 3)
0
1
1
0
1
TRCCLK input (1)
X: 0 or 1 Notes: 1. Pulled up by setting the PU03 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the P1DRR4 bit in the P1DRR register to 1. 3. N-channel open-drain output by setting the NODC bit in the U0C0 register to 1.
Table 7.9
Register Bit PD1
Port P1_5/RXD0/TRAIO/INT1
U0SR RXD0SEL0 X X 1 X X X X TRASR TRAIOSEL 1 0 Other than 10b Other than 10b Other than 10b 1 0 TRAIOC TOPCR X X X 0 X 0 0 TRAMR TMOD 2 1 0 X X X X X X X X X INTSR INT1SEL 2 1 0 X X X X 0 0 X X X X X 0 0 X X X X X 1 1 X INTEN INTCMP Function Input port (1) Output port (2) RXD0 input (1) TRAIO input (1) INT1 input (1)
TRAIO/INT1 input (1)
PD1_5 0 1 0
INT1EN INT1CP0 X X X X 1 1 X X X X X 0 0 X
Setting Value
0 0 0 X
Other than 000b, 001b X X X
Other than 10b 1 1 0 0
Other than 000b, 001b 0 0 1
TRAIO pulse output (2)
X: 0 or 1 Notes: 1. Pulled up by setting the PU03 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the P1DRR5 bit in the P1DRR register to 1.
Table 7.10
Register Bit PD1
Port P1_6/CLK0/IVREF1/LVCOUT2
U0SR CLK0SEL0 0 0 1 1 0 X 2 X X X 0 X X U0MR SMD CKDIR 1 0 X X X 0 X X X X X 1 X X X X 1 0 X X INTCMP INT1CP0 X X X X 1 X ACMR CM10E 0 0 0 0 0 1 Input port (1) Output port (2) CLK0 (external clock) input (1) CLK0 (internal clock) output (2) Comparator B1 reference voltage input (IVREF1) Comparator A2 output (2) Function
PD1_6 0 1
Setting Value
0 X 0 X
X: 0 or 1 Notes: 1. Pulled up by setting the PU03 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the P1DRR6 bit in the P1DRR register to 1.
REJ09B0458-0010 Rev.0.10 Page 79 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
Table 7.11
Register Bit PD1 PD1_7 0 1 0 Setting Value 0 0 X 0
Port P1_7/INT1/TRAIO/IVCMP1
TRASR TRAIOSEL 1 0 Other than 01b Other than 01b 0 1 TRAIOC TOPCR X X 0 X 0 0 X TRAMR TMOD 2 1 0 X X X X X X INTSR INT1SEL 2 1 0 X X X 0 0 X X X X X 0 0 X X X X X 0 0 X X INTEN INTCMP Function Input port (1) Output port (2) TRAIO input (1) INT1 input (1) TRAIO/INT1 input (1) TRAIO pulse output (2) Comparator B1 input (IVCMP1)
INT1EN INT1CP0 X X X 1 1 X 1 X X X 0 0 X 1
Other than 000b, 001b X X X
Other than 01b 0 0 1 1
Other than 000b, 001b 0 X 0 X 1 X
Other than 01b
X: 0 or 1 Notes: 1. Pulled up by setting the PU03 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the P1DRR7 bit in the P1DRR register to 1.
Table 7.12
Register Bit PD3 PD3_3 0 1 0 0 X Setting Value X 0 X 0
Port P3_3/INT3/TRCCLK/SCS/CTS2/RTS2/IVCMP3
SSMR2 CSS 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 1 0 1 0 0 0 INTEN INT3EN X X 1 X X X X X 1 TRBRCSR TRCCLKSEL 1 X X X 1 X X X X 0 X X X 0 X X X X 2 X X X 1 X X X X X TRCCR1 TCK 1 X X X 0 X X X X X 0 X X X 1 X X X X X U2SR1 CTS2SEL0 0 0 0 0 X X 1 1 0 2 X X X X U2MR SMD 1 X X X X X X Other than 000b Other than 000b X X X 0 X X X X U2CO INTCMP Function Input port (1) Output port (2) INT3 input (1) TRCCLK input (1) SCS input (1) SCS output (2, 3) CTS2 input (1) RTS2 output (2) Comparator B3 input (IVCMP1) CRS CRD INT3CP0 X X X X X X 0 1 X X X X X X X 0 0 X X X 0 X X X X X 1
Other than 10b
X: 0 or 1 Notes: 1. Pulled up by setting the PU06 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the DRR06 bit in the DRR0 register to 1. 3. N-channel open-drain output by setting the CSOS bit in the SSMR2 register to 1 (N-channel open-drain output).
REJ09B0458-0010 Rev.0.10 Page 80 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
Table 7.13
Port P3_4/TRCIOC/SSI/RXD2/SCL2/TXD2/SDA2/IVREF3
Timer RC Setting Function SMD 2 X X 1 X X 0 X X X X INT3 CP0 X X
Synchronous Serial Communication Unit (Refer to Table 24.4 Register PD3 SSUIICSR TRCPSR1 U2SR0 Association between Communication Modes and I/O Pins.) TRCIOC RXD2 TXD2 SSI output SSI input SEL SEL SEL Bit PD3_4 IICSEL control control 1 0 1 0 1 0 Other Other Other 0 X 0 0 than 10b than 01b than 10b Other Other Other 1 X 0 0 than 10b than 01b than 10b 0 X 0 0 1 0 Other Other than 01b than 10b
U2MR
U2SMR INTCMP
IICM
-- X X Refer to Table 7.23 TRCIOC Pin Setting Refer to Table 7.23 TRCIOC Pin Setting X X X X Input port (1) Output port (2) TRCIOC input (1)
X
X
X
X
X
X X Setting Value X 0 0
X 0 0 X X
0 0 1 0 0
0 1 0 0 0
1 X
0 X
Other Other than 01b than 10b X X 0 0 X X 1 1 X X
X X X X 0 0
X X X X 1
X X X X 0 1 0 1 0 0
X X X X 1
X X X X X
TRCIOC output (2) SSI input (1) SSI output (2, 3) RXD2 input (1) SCL2 input/ output (2, 4) TXD2 output (2, 4) SDA2 input/ output (2, 4) Comparator B3 reference voltage input (IVREF3)
X X Other than 10b X X
X X Other than 10b Other than 10b
X
X
0
0
X
X
X
X
1
0
0 1 1
X
X
X
0
X
0
0
X
X
X
X
1
0
0
1
1
X
X
0
X
0
0
Other Other Other than 10b than 01b than 10b
X
X
X
X
1
X
X: 0 or 1 Notes: 1. Pulled up by setting the PU07 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the DRR07 bit in the DRR0 register to 1. 3. N-channel open-drain output by setting the SOOS bit in the SSMR2 register to 1 (N-channel open-drain output) and setting the BIDE bit in the SSMR2 register to 0 (standard mode). 4. N-channel open-drain output by setting the NCH bit in the U2C0 register to 1.
REJ09B0458-0010 Rev.0.10 Page 81 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
Table 7.14
Port P3_5/SCL/SSCK/TRCIOD/CLK2
Synchronous Serial Communication Unit (Refer SSUIICSR ICCR1 to Table 24.4 Association between Communication Modes and I/O Pins.) IICSEL 0 1 0 1 1 0 0 0 ICE X 0 X 0 1 X X X 0 X 0 X 0 X 0 SSCK output control 0 X 0 X X 0 1 0 X 0 X 0 X 0 X SSCK input control 0 X 0 X X 1 0 0 X 0 X 0 X 0 X 1 0 0 XXX X 1 0 0 XXX X Timer RC Setting Function
TRCIODSEL CLK2SEL0
Register
PD3
TRCPSR1
U2SR1
U2MR
Bit
PD3_5 0 1 X X X
SMD 210 XXX XXX XXX XXX XXX
1
0
CKDIR
-- X X X X X Input port (1) Output port (2) SCL input/output (2) SSCK input (1) SSCK output (2, 3)
Other than 10b Other than 10b X X X X X X
0 0 X X X
X X X X X
Setting Value
0
1 0
Refer to Table 7.24 TRCIOD TRCIOD input (1) Pin Setting Refer to Table 7.24 TRCIOD TRCIOD output (2) Pin Setting X X CLK2 input (2) CLK2 output (2, 4)
X
1 0 1 0 1
0 X
X X
X X
1 1
XXX 001
1 0
X: 0 or 1 Notes: 1. Pulled up by setting the PU07 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the DRR07 bit in the DRR0 register to 1. 3. N-channel open-drain output by setting the SCKOS bit in the SSMR2 register to 1 (N-channel open-drain output). 4. N-channel open-drain output by setting the NODC bit in the U2SMR3 register to 1.
Table 7.15
Port P3_7/SSO/TXD2/SDA2/RXD2/SCL2/TRAO/SDA
Synchronous Serial Communication Unit (Refer SSUIICSR ICCR1 to Table 24.4 Association between Communication Modes and I/O Pins.) IICSEL 1 0 1 0 1 0 0 1 0 1 0 1 ICE 0 X 0 X 1 X X 0 X 0 X 0 X 0 X 0 X
SSO output control
Register
PD3
U2SR0
U2MR
U2SMR TRAIOC Function
Bit
PD3_7
SSO input control X 0 X 0 X 1 0 X 0 X 0 X
RXD2SEL TXD2SEL 1 0 1 0 2 X X X X X X 0 0 X X 0 1 Other than Other than 10b 01b Other than Other than 10b 01b X X X 1 1 X X X 0 0 X X X X X X
SMD 1 X X X X X X 1 0 X X X X X X 0 1 0 1 1 0 1 0 0 X
IICM X X X X X X 1
TOENA 0 0 X X X 0 X Input port (1) Output port (2) SDA input/output (2) SSO input (1) SSO output (2, 3) RXD2 input (1) SCL2 input/ output (2, 4)
0 1 X X X 0 Setting Value 0
X 0 X 0 X 0 1 X 0 X 0 X 0 X 0 X 0
Other than 01b Other than 01b
X 0 0 X 1 0 1 0 0 X 0 X 0
X
X
TXD2 output (2, 4)
X
X
0
1
0 X
1 X
1 X
X 1
SDA2 input/ output (2, 4) TRAO output (2)
Other than Other than 01b 01b
X: 0 or 1 Notes: 1. Pulled up by setting the PU07 bit in the PUR0 register to 1. 2. Output drive capacity high by setting the DRR07 bit in the DRR0 register to 1. 3. N-channel open-drain output by setting the SOOS bit in the SSMR2 register to 1 (N-channel open-drain output). 4. N-channel open-drain output by setting the NCH bit in the U2C0 register to 1.
REJ09B0458-0010 Rev.0.10 Page 82 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
Table 7.16
Register Bit Setting Value
Port P4_2/VREF
ADCON1 ADSTBY 0 1 Function Input port Input port/VREF input
Table 7.17
Register Bit
Port P4_5/INT0/RXD2/SCL2/ADTRG
PD4 INTEN INT0EN X X 1 X X 1 U2SR0 RXD2SEL 1 0 Other than 11b Other than 11b Other than 11b 1 1 1 1 U2MR SMD 1 X X X X 1 X U2SMR 0 X X X X 0 X IICM X X X X 1 X ADMOD ADCAP 1 0 X X X X X 1 X X X X X 1 Function Input port (1) Output port (2) INT0 input (1) RXD2 input (1) SCL2 input/output (2, 3) ADTRG input (1)
PD4_5 0 1 0 0 0 0
2 X X X X 0 X
Setting Value
Other than 11b
X: 0 or 1 Notes: 1. Pulled up by setting the PU11 bit in the PUR1 register to 1. 2. Output drive capacity high by setting the DRR11 bit in the DRR1 register to 1. 3. N-channel open-drain output by setting the NCH bit in the U2C0 register to 1.
Table 7.18
Register Bit PD4
Port P4_6/XIN/XCIN
CM0 CM1 Function Input port (1) Output port (2) XIN-XOUT oscillation (on-chip feedback resistor enabled) XIN-XOUT oscillation (on-chip feedback resistor disabled) XIN-XOUT oscillation stop (on-chip feedback resistor enabled) XIN-XOUT oscillation stop (on-chip feedback resistor disabled) XCIN-XCOUT oscillation (on-chip feedback resistor enabled) XCIN-XCOUT oscillation (on-chip feedback resistor disabled) XCIN-XCOUT oscillation stop (on-chip feedback resistor enabled) XCIN-XCOUT oscillation stop (on-chip feedback resistor disabled) Oscillation stop (STOP mode)
Circuit specifications Oscillation Feedback PD4_6 CM01 CM03 CM04 CM05 CM10 CM11 CM12 CM13 buffer resistor 0 1 X X X X 0 0 X X 0 0 X X 0 0 1 0 X X 1 0 0 X 1 OFF OFF 0 0 1 1 1 1 OFF OFF OFF 1 X 0 X 1 0 OFF ON ON OFF ON ON OFF ON ON OFF X X 0 0 OFF OFF ON OFF OFF ON
Setting Value X
1
X X X 1 X X OFF X: 0 or 1 Notes: 1. Pulled up by setting the PU11 bit in the PUR1 register to 1. 2. Output drive capacity high by setting the DRR11 bit in the DRR1 register to 1.
REJ09B0458-0010 Rev.0.10 Page 83 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
Table 7.19
Register Bit PD4
Port P4_7/XOUT/XCOUT
CM0 CM1 Function Input port (1) Output port (2) XIN-XOUT oscillation (on-chip feedback resistor enabled) XIN-XOUT oscillation (on-chip feedback resistor disabled) XIN-XOUT oscillation stop (on-chip feedback resistor enabled) XIN-XOUT oscillation stop (on-chip feedback resistor disabled) XCIN-XCOUT oscillation (on-chip feedback resistor enabled) (3) XCIN-XCOUT oscillation (on-chip feedback resistor disabled) (3) XCIN-XCOUT oscillation stop (on-chip feedback resistor enabled) XCIN-XCOUT oscillation stop (on-chip feedback resistor disabled) Oscillation stop (STOP mode)
Circuit specifications Oscillation Feedback PD4_7 CM01 CM03 CM04 CM05 CM10 CM11 CM12 CM13 buffer resistor 0 1 X X X X 0 0 X X 0 0 X X 0 0 1 0 X X 1 0 0 X 1 OFF OFF 0 0 1 1 1 1 OFF OFF 1 X 0 X 1 0 OFF ON ON OFF ON ON OFF ON ON OFF X X 0 0 OFF OFF ON OFF OFF ON
Setting Value X
1
X X X 1 X X OFF OFF X: 0 or 1 Note: 1. Pulled up by setting the PU11 bit in the PUR1 register to 1. 2. Output drive capacity high by setting the DRR11 bit in the DRR1 register to 1. 3. Since the XCIN-XCOUT oscillation buffer operates with internal step-down power, the XCOUT output level cannot be used as the CMOS level signal directly.
REJ09B0458-0010 Rev.0.10 Page 84 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
Table 7.20
Register Bit Setting value
TRBO Pin Setting
TRBIOC TOCNT (1) 0 0 0 1 TMOD1 0 1 1 0 TRBMR TMOD0 1 0 1 1 Function Programmable waveform generation mode Programmable one-shot generation mode Programmable wait one-shot generation mode Programmable output port
Note: 1. Set the TOCNT bit in the TRBIOC register to 0 in modes except for programmable waveform generation mode.
Table 7.21
Register Bit
TRCIOA Pin Setting
TRCMR PWM2 1 1 0 IOA2 0 1 X TRCIOR0 IOA1 0 1 X X IOA0 1 X X X TRCCR2 TCEG1 TCEG0 X X 0 1 X X 1 X Function Timer waveform output (output compare function) Timer mode (input capture function) PWM2 mode TRCTRG input
TRCOER EA 0
Setting Value
0 1 1
X: 0 or 1
Table 7.22
Register Bit
TRCIOB Pin Setting
TRCOER EB 0 0 0 0 1 TRCMR PWM2 PWMB 0 X 1 1 1 1 0 0 IOB2 X X 0 1 TRCIOR0 IOB1 X X 0 1 X IOB0 X X 1 X X Function PWM2 mode waveform output PWM mode waveform output Timer waveform output (output compare function) Timer mode (input capture function)
Setting Value
X: 0 or 1
Table 7.23
Register Bit
TRCIOC Pin Setting
TRCOER EC 0 0 0 1 TRCMR PWM2 PWMC 1 1 1 1 0 0 IOC2 X 0 1 TRCIOR1 IOC1 X 0 1 X IOC0 X 1 X X Function PWM mode waveform output Timer waveform output (output compare function) Timer mode (input capture function)
Setting Value
X: 0 or 1
Table 7.24
Register Bit
TRCIOD Pin Setting
TRCOER ED 0 0 0 1 TRCMR PWM2 PWMD 1 1 1 1 0 0 IOD2 X 0 1 TRCIOR1 IOD1 X 0 1 X IOD0 X 1 X X Function PWM mode waveform output Timer waveform output (output compare function) Timer mode (input capture function)
Setting Value
X: 0 or 1
REJ09B0458-0010 Rev.0.10 Page 85 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
7. I/O Ports
7.6
Unassigned Pin Handling
Table 7.25 lists Unassigned Pin Handling. Figure 7.9 shows the Unassigned Pin Handling. Table 7.25 Unassigned Pin Handling
Pin Name Connection Ports P1, P3_3 to P3_5, * After setting to input mode, connect each pin to VSS via a resistor (pull-down) P3_7, P4_5 or connect each pin to VCC via a resistor (pull-up). (2) * After setting to output mode, leave these pins open. (1, 2) Ports P4_6, P4_7 Connect to VCC via a pull-up resistor (2) Port P4_2/VREF Connect to VCC RESET (3) Connect to VCC via a pull-up resistor (2) Notes: 1. If these ports are set to output mode and left open, they remain in input mode until they are switched to output mode by a program. The voltage level of these pins may be undefined and the power current may increase while the ports remain in input mode. The content of the direction registers may change due to noise or program runaway caused by noise. In order to enhance program reliability, the program should periodically repeat the setting of the direction registers. 2. Connect these unassigned pins to the MCU using the shortest wire length (2 cm or less) possible. 3. When the power-on reset function is in use.
MCU
Port P1, P3_3 to P3_5, P3_7, P4_5
(Input mode ) : : (Input mode) (Output mode)
: : Open
P4_6, P4_7
RESET (1)
Port P4_2/VREF
Note: 1. When the power-on reset function is in use.
Figure 7.9
Unassigned Pin Handling
REJ09B0458-0010 Rev.0.10 Page 86 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
8. Bus
8.
Bus
The bus cycles differ when accessing ROM/RAM and when accessing SFR. Table 8.1 lists Bus Cycles by Access Area of R8C/32A Group (with Data Flash). ROM/RAM and SFR are connected to the CPU by an 8-bit bus. When accessing in word (16-bit) units, these areas are accessed twice in 8-bit units. Table 8.2 shows Access Units and Bus Operations. Table 8.1 Bus Cycles by Access Area of R8C/32A Group (with Data Flash) Bus Cycle 2 cycles of CPU clock 1 cycle of CPU clock
Access Area SFR/Data flash Program ROM/RAM Table 8.2
Area Even address Byte access CPU clock Address Data Odd address Byte access CPU clock Address Data Even address Word access CPU clock Address Data Odd address Word access CPU clock Address Data Odd Data Even Data
Access Units and Bus Operations
SFR, Data flash ROM (program ROM), RAM CPU clock Even Data Address Data CPU clock Odd Data Address Data CPU clock Even + 1 Data Address Data CPU clock Odd + 1 Data Address Data Odd Data Odd + 1 Data Even Data Even + 1 Data Odd Data Even Data
REJ09B0458-0010 Rev.0.10 Page 87 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
8. Bus
However, only the following SFRs are connected with the 16-bit bus: Interrupts: Each interrupt control register Timer RC: Registers TRC, TRCGRA, TRCGRB, TRCGRC, and TRCGRD SSU: Registers SSTDR, SSTDRH, SSRDR, and SSRDRH UART2: Registers U2MR, U2BRG, U2TB, U2C0, U2C1, U2RB, U2SMR5, U2SMR4, U2SMR3, U2SMR2, and U2SMR A/D converter: Registers AD0, AD1, AD2, AD3, AD4, AD5, AD6, AD7, ADMOD, ADINSEL, ADCON0, and ADCON1 Address match interrupt: Registers RMAD0, AIER0, RMAD1, and AIER1 Therefore, they are accessed once in 16-bit units. The bus operation is the same as "Area: SFR, Data flash, Even address Byte Access" in Table 8.2 Access Units and Bus Operations, and 16-bit data is accessed at a time.
REJ09B0458-0010 Rev.0.10 Page 88 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.
Clock Generation Circuit
The following five circuits are incorporated in the clock generation circuit: * XIN clock oscillation circuit * XCIN clock oscillation circuit * Low-speed on-chip oscillator * High-speed on-chip oscillator * Low-speed on-chip oscillator for watchdog timer
9.1
Overview
Table 9.1 lists the Specification Overview of Clock Generation Circuit. Figure 9.1 shows a Clock Generation Circuit (With XIN and XCIN Pins Shared). Figure 9.2 shows a Peripheral Function Clock and Figure 9.3 shows a Procedure for Reducing Internal Power Consumption Using VCA20 bit. Table 9.1
Item Applications
Specification Overview of Clock Generation Circuit
XIN Clock XCIN Clock Oscillation Circuit Oscillation Circuit * CPU clock source * Peripheral function clock source * CPU clock source * Peripheral function clock source On-Chip Oscillator High-Speed Low-Speed On-Chip Oscillator On-Chip Oscillator * CPU clock * CPU clock source source * Peripheral * Peripheral function clock function clock source source * CPU and * CPU and peripheral peripheral function clock function clock source when XIN source when XIN clock stops clock stops oscillating oscillating (3) Approx. 125 kHz Approx. 40 MHz - - Low-Speed On-Chip Oscillator for Watchdog Timer * Watchdog timer clock source
Clock frequency 0 to 20 MHz Connectable oscillator * Ceramic resonator * Crystal oscillator XIN, XOUT (1) Usable Stop Externally generated clock can be input (2)
32.768 kHz * Crystal oscillator
Approx. 125 kHz -
Oscillator connect pins Oscillation stop, restart function Oscillator status after reset Others
XCIN, XCOUT (1) - (1) Usable Stop Usable Stop
- (1) Usable Oscillate -
- Usable Stop -
* Externally - generated clock can be input * On-chip feedback resistor Rf (connected/ not connected selectable)
Notes: 1. These pins can be used as P4_6 or P4_7 when using the on-chip oscillator clock as the CPU clock while the XIN clock oscillation circuit and the XCIN clock oscillation circuit are not used. 2. To input an external clock, set the CM05 bit in the CM0 register to 1 (XIN clock stops), the CM11 bit in the CM1 register to 1 (internal feedback resistor disabled), and the CM13 bit to 1 (XIN-XOUT pin). 3. The clock frequency is automatically set to up to 20 MHz by a divider when using the high-speed on-chip oscillator as the CPU clock source.
REJ09B0458-0010 Rev.0.10 Page 89 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
CSPRO
Low-speed on-chip oscillator for watchdog timer
fOCO-WDT fC fC2 fC4
fC
1/2
1/2
1/8
fC32
FRA1 register Frequency adjustable FRA00 High-speed on-chip oscillator fOCO40M
FRA2 register Divider
fOCO-F FRA01 = 1 FRA01 = 0 fOCO (On-chip oscillator clock) fOCO FRA03 = 1 FRA03 = 0 CM14 CM10 = 1 (stop mode) RESET Power-on reset Software reset Interrupt request WAIT instruction CM30 Low-speed on-chip oscillator Power-on reset circuit fOCO-S Voltage detection circuit fOCO-S b c f1 f2 d e OCD2 = 1 Stop signal CM07 = 0 a XIN/XCIN CM01 = 0 CM13 CM05 System clock CM02 XOUT/XCOUT CM07 = 1 OCD2 = 0 Divider h CPU clock g f32 f4 f8 Divider (1/128) fOCO128 Peripheral function clock
SQ R
SQ
Oscillation stop detection
R
XIN clock
CM04 CM01 CM03
XIN clock
b a 1/2
c 1/2
d 1/2
e 1/2 1/2
g
XCIN clock CM06 = 1 CM06 = 0 CM17 to CM16 = 10b CM02, CM03, CM04, CM05, CM06, CM07: Bits in CM0 register CM10, CM13, CM14, CM16, CM17: Bits in CM1 register CM30: Bit in CM3 register OCD0, OCD1, OCD2: Bits in OCD register FRA00, FRA01, FRA03: Bits in FRA0 register CM06 = 0 CM17 to CM16 = 01b CM06 = 0 CM17 to CM16 = 00b
CM06 = 0 CM17 to CM16 = 11b
h
Detail of divider
Oscillation Stop Detection Circuit
Forcible discharge when OCD0 = 0
XIN clock
Pulse generation circuit for clock edge detection and charge/discharge control
Charge/discharge circuit OCD1
Oscillation stop detection Interrupt generation circuit Watchdog timer interrupt Voltage monitor 1 interrupt Voltage monitor 2 interrupt OCD2 bit switch signal CM14 bit switch signal
Oscillation stop detection, Watchdog timer, Voltage monitor 1 interrupt, Voltage monitor 2 interrupt
Figure 9.1
Clock Generation Circuit (With XIN and XCIN Pins Shared) Apr 01, 2008
REJ09B0458-0010 Rev.0.10 Page 90 of 572
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
fC fC4 fC32 fOCO40M fOCO128 fOCO fOCO-F fOCO-WDT Watchdog timer INT0 Timer RA Timer RB Timer RC Timer RE A/D converter UART0 UART2 SSU / I2C bus
f1 f2 f4 f8 f32 CPU clock CPU
Figure 9.2
Peripheral Function Clock
REJ09B0458-0010 Rev.0.10 Page 91 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.2 9.2.1
Registers System Clock Control Register 0 (CM0)
b6 CM06 0 b5 CM05 1 b4 CM04 0 b3 CM03 1 b2 CM02 0 b1 CM01 0 b0 -- 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 0006h Bit b7 Symbol CM07 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name -- Reserved bit CM01 XIN-XCIN switch bit CM02 CM03 CM04 CM05 CM06 CM07
Function Set to 0. 0: P4_6 and P4_7 set as XIN-XOUT pin 1: P4_6 and P4_7 set as XCIN-XCOUT pin Wait mode peripheral function clock 0: Peripheral function clock does not stop in wait mode stop bit 1: Peripheral function clock stops in wait mode XCIN clock stop bit 0: XCIN clock oscillates 1: XCIN clock stops 0: I/O ports P4_6 and P4_7 Port/XCIN-XCOUT switch bit (5) 1: XCIN-XCOUT pin (6) XIN clock (XIN-XOUT) stop bit (1, 3) 0: XIN clock oscillates 1: XIN clock stops (2) System clock division select bit 0 (4) 0: Bits CM16 and CM17 in CM1 register enabled 1: Divide-by-8 mode 0: XIN clock XIN, XCIN clock select bit (7) 1: XCIN clock
Notes: 1. The CM05 bit stops the XIN clock when the high-speed on-chip oscillator mode or low-speed on-chip oscillator mode is selected. This bit cannot be used to detect whether the XIN clock has stopped. To stop the XIN clock, set the bits in the following order: (a) Set bits OCD1 to OCD0 in the OCD register to 00b. (b) Set the OCD2 bit to 1 (on-chip oscillator clock selected). 2. During external clock input, only the clock oscillation buffer stops and clock input is acknowledged. 3. Only when the CM05 bit is set to 1 (XIN clock stops) and the CM13 bit in the CM1 register is set to 0 (P4_6 and P4_7), P4_6 and P4_7 can be used as I/O ports. 4. When the MCU enters stop mode, the CM06 bit is set to 1 (divide-by-8 mode). 5. The CM04 bit can be set to 1 by a program but cannot be set to 0. 6. To use the XCIN clock, set the CM04 bit to 1. 7. Set the CM07 bit to 1 (XCIN clock) from 0 after setting the CM04 bit to 1 (XCIN-XCOUT pin) and allowing XCIN clock oscillation to stabilize.
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the CM0 register.
REJ09B0458-0010 Rev.0.10 Page 92 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.2.2
System Clock Control Register 1 (CM1)
b6 CM16 0 b5 -- 1 b4 CM14 0 b3 CM13 0 b2 CM12 0 b1 CM11 0 b0 CM10 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 0007h Bit b7 Symbol CM17 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name CM10 All clock stop control bit (2) CM11 CM12 CM13 CM14 -- CM16 CM17
Function 0: Clock oscillates 1: All clocks stop (stop mode) XIN-XOUT on-chip feedback resistor 0: On-chip feedback resistor enabled select bit 1: On-chip feedback resistor disabled XCIN-XCOUT on-chip feedback 0: On-chip feedback resistor enabled resistor select bit 1: On-chip feedback resistor disabled 0: I/O ports P4_6 and P4_7 Port/XCIN-XCOUT switch bit (5) 1: XIN-XOUT pin Low-speed on-chip oscillator stop bit 0: Low-speed on-chip oscillator on (3, 4) 1: Low-speed on-chip oscillator off Reserved bit Set to 1. System clock division select bit 1 (1) b7 b6 0 0: No division mode 0 1: Divide-by-2 mode 1 0: Divide-by-4 mode 1 1: Divide-by-16 mode
Notes: 1. When the CM06 bit is set to 0 (bits CM16 and CM17 enabled), bits CM16 and CM17 are enabled. 2. If the CM10 bit is set to 1 (stop mode), the on-chip feedback resistor is disabled. 3. When the OCD2 bit is set to 0 (XIN clock selected), the CM14 bit can be set to 1 (low-speed on-chip oscillator off). When the OCD2 bit is set to 1 (on-chip oscillator clock selected), the CM14 bit is set to 0 (low-speed on-chip oscillator on). It remains unchanged even if 1 is written to it. 4. To use the voltage monitor 1 interrupt or voltage monitor 2 interrupt (when the digital filter is used), set the CM14 bit to 0 (low-speed on-chip oscillator on). 5. Once the CM13 bit is set to 1 by a program, it cannot be set to 0.
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the CM1 register.
REJ09B0458-0010 Rev.0.10 Page 93 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.2.3
System Clock Control Register 3 (CM3)
b6 CM36 0 b5 CM35 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 CM30 0 R/W R/W --
Address 0009h Bit b7 Symbol CM37 After Reset 0 Bit b0 b1 b2 b3 b4 b5
Symbol Bit Name CM30 Wait control bit (1) -- -- -- -- CM35
Function 0: Other than wait mode 1: MCU enters wait mode Nothing is assigned. If necessary, set to 0. When read, the content is 0.
CPU clock division when exiting wait mode select bit (2)
0: Following settings are enabled: CM06 bit in CM0 register Bits CM16 and CM17 in CM1 register 1: No division
b7 b6
R/W
b6 b7
CM36 CM37
CPU clock when exiting wait mode or stop mode select bit
0 0: MCU exits with the CPU clock immediately before entering wait or stop mode. 0 1: Do not set. 1 0: High-speed on-chip oscillator clock selected (3) 1 1: XIN clock selected (4)
R/W R/W
Notes: 1. When the MCU exits wait mode by a peripheral function interrupt, the CM30 bit is set to 0 (other than wait mode). 2. Set the CM35 bit to 0 in stop mode. When the MCU enters wait mode, if the CM35 bit is set to 1 (no division), the CM06 bit in the CM0 register is set to 0 (bits CM16 and CM17 enabled) and bits CM17 and CM16 in the CM1 register is set to 00b (no division mode). 3. When bits CM37 and CM36 are set to 10b (high-speed on-chip oscillator clock selected), the following will be set when the MCU exits wait mode or stop mode. * OCD2 bit in OCD register = 1 (on-chip oscillator selected) * FRA00 bit in FRA0 register = 1 (high-speed on-chip oscillator on) * FRA01 bit in FRA0 register = 1 (high-speed on-chip oscillator selected) 4. When bits CM37 and CM36 are set to 11b (XIN clock selected), the following will be set when the MCU exits wait mode or stop mode. * OM05 bit in OM0 register = 1 (XIN clock oscillates) * OM13 bit in OM1 register = 1 (XIN-XOUT pin) * OCD2 bit in OCD register = 0 (XIN clock selected)
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the CM3 register.
CM30 bit (Wait Control Bit)
When the CM30 bit is set to 1 (MCU enters wait mode), the CPU clock stops (wait mode). Since the XIN clock, XCIN clock, and the on-chip oscillator clock do not stop, the peripheral functions using these clocks continue operating. The MCU exits wait mode by a reset or peripheral function interrupt. If the MCU enters wait mode while the I flag is set to 0 (maskable interrupt disabled), it resumes executing the instruction immediately after the instruction to set the CM30 bit to 1 when exiting wait mode. If the MCU enters wait mode with the WAIT instruction, interrupt handling is performed by the CPU when exiting wait mode.
REJ09B0458-0010 Rev.0.10 Page 94 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.2.4
Oscillation Stop Detection Register (OCD)
b6 -- 0 b5 -- 0 b4 -- 0 b3 OCD3 0 b2 OCD2 1 b1 OCD1 0 b0 OCD0 0 R/W R/W R/W R/W R R/W
Address 000Ch Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function OCD0 Oscillation stop detection enable bit (6) 0: Oscillation stop detection function disabled (1) 1: Oscillation stop detection function enabled OCD1 Oscillation stop detection interrupt 0: Disabled (1) enable bit 1: Enabled OCD2 System clock select bit (3) 0: XIN clock selected (6) 1: On-chip oscillator clock selected (2) 0: XIN clock oscillates OCD3 Clock monitor bit (4, 5) 1: XIN clock stops -- Reserved bits Set to 0. -- -- --
Notes: 1. Set bits OCD1 to OCD0 to 00b before the MCU enters stop mode, high-speed on-chip oscillator mode, or lowspeed on-chip oscillator mode (XIN clock stops). 2. If the OCD2 bit is set to 1 (on-chip oscillator clock selected), the CM14 bit is set to 0 (low-speed on-chip oscillator on). 3. The OCD2 bit is automatically set to 1 (on-chip oscillator clock selected) if XIN clock oscillation stop is detected while bits OCD1 to OCD0 are set to 11b. If the OCD3 bit is set to 1 (XIN clock stops), the OCD2 bit remains unchanged even when set to 0 (XIN clock selected). 4. The OCD3 bit is enabled when the OCD0 bit is set to 1 (oscillation stop detection function enabled). 5. The OCD3 bit remains 0 (XIN clock oscillates) if bits OCD1 to OCD0 are set to 00b. 6. Refer to Figure 9.10 Procedure for Switching Clock Source from Low-Speed On-Chip Oscillator to XIN Clock for the switching procedure when the XIN clock re-oscillates after detecting oscillation stop.
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the OCD register.
9.2.5
High-Speed On-Chip Oscillator Control Register 7 (FRA7)
b5 -- b4 -- b3 -- b2 -- b1 -- b0 --
Address 0015h Bit b7 b6 Symbol -- -- After Reset When shipping
Bit Function b7-b0 32 MHz frequency correction data is stored. The frequency can be adjusted by transferring this value to the FRA3 register and by transferring the correction value in the FRA6 register to the FRA1 register.
R/W R
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.2.6
High-Speed On-Chip Oscillator Control Register 0 (FRA0)
b6 -- 0 b5 -- 0 b4 -- 0 b3 FRA03 0 b2 -- 0 b1 FRA01 0 b0 FRA00 0 R/W R/W R/W R/W R/W R/W
Address 0023h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name FRA00 High-speed on-chip oscillator enable bit FRA01 -- FRA03 -- -- -- --
Function 0: High-speed on-chip oscillator off 1: HIgh-speed on-chip oscillator on High-speed on-chip oscillator select bit (1) 0: Low-speed on-chip oscillator selected (2) 1: High-speed on-chip oscillator selected Reserved bits Set to 0. fOCO128 clock select bit 0: fOCO-S divided by 128 selected 1: fOCO-F divided by 128 selected Reserved bits Set to 0.
Notes: 1. Change the FRA01 bit in the following conditions. * FRA00 = 1 (high-speed on-chip oscillator on) * The CM14 bit in the CM1 register = 0 (low-speed on-chip oscillator on) * Bits FRA22 to FRA20 in the FRA2 register: All division mode can be set when VCC = 3.0 V to 5.5 V 000b to 111b Divide ratio of 4 or more when VCC = 2.7 V to 5.5 V 010b to 111b (divide-by-4 or more) Divide ratio of 8 or more when VCC = 2.2 V to 5.5 V 110b to 111b (divide-by-8 or more) 2. When setting the FRA01 bit to 0 (low-speed on-chip oscillator selected), do not set the FRA00 bit to 0 (highspeed on-chip oscillator off) at the same time. Set the FRA00 bit to 0 after setting the FRA01 bit to 0.
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the FRA0 register.
9.2.7
High-Speed On-Chip Oscillator Control Register 1 (FRA1)
b5 -- b4 -- b3 -- b2 -- b1 -- b0 --
Address 0024h Bit b7 b6 Symbol -- -- After Reset When shipping
Bit Function b7-b0 The frequency of the high-speed on-chip oscillator can be adjusted by setting as follows: 40 MHz: FRA3 = value after reset 36.864 MHz: Transfer the value in the FRA4 register to the FRA1 register and the value in the FRA5 register to the FRA3 register. 32 MHz: Transfer the value in the FRA6 register to the FRA1 register and the value in the FRA7 register to the FRA3 register.
R/W R/W
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the FRA1 register.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.2.8
High-Speed On-Chip Oscillator Control Register 2 (FRA2)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 FRA22 0 b1 FRA21 0 b0 FRA20 0 R/W R/W R/W R/W
Address 0025h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2
Symbol Bit Name FRA20 High-speed on-chip oscillator frequency FRA21 switching bit FRA22
Function Division selection These bits select the division ratio for the highspeed on-chip oscillator clock.
b2 b1 b0
b3 b4 b5 b6 b7
-- -- -- -- --
Reserved bits
0 0 0: Divide-by-2 mode 0 0 1: Divide-by-3 mode 0 1 0: Divide-by-4 mode 0 1 1: Divide-by-5 mode 1 0 0: Divide-by-6 mode 1 0 1: Divide-by-7 mode 1 1 0: Divide-by-8 mode 1 1 1: Divide-by-9 mode Set to 0.
R/W
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the FRA2 register.
9.2.9
Clock Prescaler Reset Flag (CPSRF)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 Function Set to 0. b0 -- 0 R/W R/W
Address 0028h Bit b7 Symbol CPSR After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name -- Reserved bits -- -- -- -- -- -- CPSR Clock prescaler reset flag
Setting this bit to 1 initializes the clock prescaler. (When read, the content is 0)
R/W
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.2.10
High-Speed On-Chip Oscillator Control Register 4 (FRA4)
b5 -- b4 -- b3 -- b2 -- b1 -- b0 --
Address 0029h Bit b7 b6 Symbol -- -- After Reset When shipping
Bit Function b7-b0 36.864 MHz frequency correction data is stored. The frequency can be adjusted by transferring this value to the FRA1 register and by transferring the correction value in the FRA5 register to the FRA3 register.
R/W R
9.2.11
High-Speed On-Chip Oscillator Control Register 5 (FRA5)
b5 -- b4 -- b3 -- b2 -- b1 -- b0 --
Address 002Ah Bit b7 b6 Symbol -- -- After Reset When shipping
Bit Function b7-b0 36.864 MHz frequency correction data is stored. The frequency can be adjusted by transferring this value to the FRA3 register and by transferring the correction value in the FRA4 register to the FRA1 register.
R/W R
9.2.12
High-Speed On-Chip Oscillator Control Register 6 (FRA6)
b5 -- b4 -- b3 -- b2 -- b1 -- b0 --
Address 002Bh Bit b7 b6 Symbol -- -- After Reset When shipping
Bit Function b7-b0 32 MHz frequency correction data is stored. The frequency can be adjusted by transferring this value to the FRA1 register and by transferring the correction value in the FRA7 register to the FRA3 register.
R/W R
9.2.13
High-Speed On-Chip Oscillator Control Register 3 (FRA3)
b5 -- b4 -- b3 -- b2 -- b1 -- b0 --
Address 002Fh Bit b7 b6 Symbol -- -- After Reset When shipping
Bit Function b7-b0 The frequency of the high-speed on-chip oscillator can be adjusted by setting as follows: 40 MHz: FRA3 = value after reset 36.864 MHz: Transfer the value in the FRA4 register to the FRA1 register and the value in the FRA5 register to the FRA3 register. 32 MHz: Transfer the value in the FRA6 register to the FRA1 register and the value in the FRA7 register to the FRA3 register.
R/W R/W
Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the FRA3 register.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.2.14
Voltage Detect Register 2 (VCA2)
b2 VCA22 0 0 b1 VCA21 0 0 b0 VCA20 0 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 0034h Bit b7 b6 b5 b4 b3 Symbol VCA27 VCA26 VCA25 VCA24 VCA23 After Reset The LVDAS bit in the OFS register is set to 1. 0 0 0 0 0 After Reset The LVDAS bit in the OFS register is set to 0. 0 0 1 0 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol Bit Name VCA20 Internal power low consumption enable bit (1) VCA21 Comparator A1 reference voltage input select bit VCA22 LVCMP1 comparison voltage external input select bit VCA23 Comparator A2 reference voltage input select bit VCA24 LVCMP2 comparison voltage external input select bit VCA25 Voltage detection 0 enable bit (3) VCA26 VCA27 Voltage detection 1/comparator A1 enable bit (4) Voltage detection 2/comparator A2 enable bit (5)
Function 0: Low consumption disabled 1: Low consumption enabled (2) 0: Internal reference voltage 1: LVREF pin input voltage 0: Supply voltage (VCC) 1: LVCMP1 pin input voltage 0: Internal reference voltage 1: LVREF pin input voltage 0: Supply voltage (VCC) (Vdet2_0) 1: LVCMP2 pin input voltage (Vdet2_EXT) 0: Voltage detection 0 circuit disabled 1: Voltage detection 0 circuit enabled 0: Voltage detection 1/comparator A1 circuit disabled 1: Voltage detection 1/comparator A1 circuit enabled 0: Voltage detection 2/comparator A2 circuit disabled 1: Voltage detection 2/comparator A2 circuit enabled
Notes: 1. Use the VCA20 bit only when the MCU enters wait mode. To set the VCA20 bit, follow the procedure shown in Figure 9.3 Procedure for Reducing Internal Power Consumption Using VCA20 bit. 2. When the VCA20 bit is set to 1 (low consumption enabled), do not set the CM10 bit in the CM1 register to 1 (stop mode). 3. To use voltage monitor 0 reset, set the VCA25 bit to 1. After the VCA25 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection circuit starts operation. 4. To use the voltage detection 1/comparator A1 interrupt or the VW1C3 bit in the VW1C register, set the VCA26 bit to 1. After the VCA26 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 1/comparator A1 circuit starts operation. 5. To use the voltage detection 2/comparator A2 interrupt or the VCAC13 bit in the VCA1 register, set the VCA27 bit to 1. After the VCA27 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 2/comparator A2 circuit starts operation.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VCA2 register.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
Exit wait mode by interrupt Procedure for enabling reduced internal power consumption using VCA20 bit
(Note 1)
In interrupt routine
Step (1)
Enter low-speed clock mode or low-speed on-chip oscillator mode
Step (5)
VCA20 0 (internal power low consumption disabled) (2) (This is automatically set when exiting wait mode)
Step (2)
Stop XIN clock and high-speed on-chip oscillator clock
Step (6)
Start XIN clock or high-speed on-chip oscillator clock
Step (3)
VCA20 1 (internal power low consumption enabled) (2, 3)
Step (7)
(Wait until XIN clock or high-speed on-chip oscillator clock oscillation stabilizes)
If it is necessary to start the high-speed clock or high-speed on-chip oscillator during the interrupt routine, execute steps (6) to (7) in the routine.
Step (4)
Enter wait mode (4)
Step (8)
Enter high-speed clock mode or high-speed on-chip oscillator mode
Step (5)
VCA20 0 (internal power low consumption disabled) (2)
Interrupt handling
Step (6)
Start XIN clock or high-speed on-chip oscillator clock
Step (1)
Enter low-speed clock mode or low-speed on-chip oscillator mode If the high-speed clock or high-speed on-chip oscillator starts during the interrupt routine, execute steps (1) to (3) at the end of the routine.
Step (7)
(Wait until XIN clock or high-speed on-chip oscillator clock oscillation stabilizes)
Step (2)
Stop XIN clock and high-speed on-chip oscillator clock
Step (8)
Enter high-speed clock mode or high-speed on-chip oscillator mode
Step (3)
VCA20 1 (internal power low consumption enabled) (2, 3)
Interrupt handling completed
Notes: 1. Execute this routine to handle all interrupts generated in wait mode. However, this does not apply if it is not necessary to start the high-speed clock or high-speed on-chip oscillator during the interrupt routine. 2. Do not set the VCA20 bit to 0 with the instruction immediately after setting the VCA20 bit to 1. Also, do not do the opposite. 3. When the VCA20 bit is set to 1, do not set the CM10 bit to 1 (stop mode). 4. When the MCU enters wait mode, follow 9.7.2 Wait Mode. VCA20: Bit in VCA2 register
Figure 9.3
Procedure for Reducing Internal Power Consumption Using VCA20 bit
REJ09B0458-0010 Rev.0.10 Page 100 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group The clocks generated by the clock generation circuits are described below.
9. Clock Generation Circuit
9.3
XIN Clock
The XIN clock is supplied by the XIN clock oscillation circuit. This clock is used as the clock source for the CPU and peripheral function clocks. The XIN clock oscillation circuit is configured by connecting a resonator between pins XIN and XOUT. The XIN clock oscillation circuit includes an on-chip feedback resistor, which is disconnected from the oscillation circuit in stop mode in order to reduce the amount of power consumed by the chip. The XIN clock oscillation circuit may also be configured by feeding an externally generated clock to the XOUT pin. Figure 9.4 shows Examples of XIN Clock Connection Circuit. During and after a reset, the XIN clock stops. After setting the CM13 bit in the CM1 register to 1 (XIN-XOUT pin), the XIN clock starts oscillating when the CM05 bit in the CM0 register is set to 0 (XIN clock oscillates). After the XIN clock oscillation stabilizes, the XIN clock is used as the CPU clock source when the OCD2 bit in the OCD register is set to 0 (XIN clock selected). The power consumption can be reduced by setting the CM05 bit in the CM0 register to 1 (XIN clock stops) if the OCD2 bit is set to 1 (on-chip oscillator clock selected). When an externally generated clock is input to the XOUT pin, the XIN clock does not stop even if the CM05 bit is set to 1. If necessary, use an external circuit to stop the clock. In stop mode, all clocks including the XIN clock stop. Refer to 9.7 Power Control for details.
* When CM05 bit in CM0 register is set to 0 (XIN clock oscillates) and CM13 bit in CM1 register is set to 1 (XIN-XOUT pin)
* When CM05 bit in CM0 register is set to 1 (XIN clock stops), CM11 bit in CM1 register is set to 1 (internal feedback resistor disabled), and the CM13 bit is set to 1 (XIN-XOUT pin) MCU (on-chip feedback resistor) XIN Open XOUT
MCU (on-chip feedback resistor) XIN Rf
(1)
XOUT
Rd (1)
Externally generated clock
CIN
COUT
VCC VSS
Ceramic resonator external circuit
External clock input circuit
Note: 1. Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive capacity settings. Use the values recommended by the oscillator manufacturer. If the oscillator manufacturer's datasheet specifies that a feedback resistor be added to the chip externally, insert a feedback resistor between XIN and XOUT following the instructions.
Figure 9.4
Examples of XIN Clock Connection Circuit
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.4
On-Chip Oscillator Clock
The on-chip oscillator clock is supplied by the on-chip oscillator (high-speed on-chip oscillator or low-speed onchip oscillator). This clock is selected by the FRA01 bit in the FRA0 register.
9.4.1
Low-Speed On-Chip Oscillator Clock
The clock generated by the low-speed on-chip oscillator is used as the clock source for the CPU clock, peripheral function clock, fOCO, fOCO-S, and fOCO128. After a reset, the on-chip oscillator clock generated by the low-speed on-chip oscillator divided by 1 (no division) is selected as the CPU clock. If the XIN clock stops oscillating when bits OCD1 to OCD0 in the OCD register are set to 11b, the low-speed on-chip oscillator automatically starts operating and supplies the necessary clock for the MCU. The frequency of the low-speed on-chip oscillator varies depending on the supply voltage and the operating ambient temperature. Application products must be designed with sufficient margin to allow for frequency changes.
9.4.2
High-Speed On-Chip Oscillator Clock
The clock generated by the high-speed on-chip oscillator is used as the clock source for the CPU clock, peripheral function clock, fOCO, fOCO-F, fOCO40M, and fOCO128. To use the high-speed on-chip oscillator clock as the clock source for the CPU clock, peripheral clock, fOCO, and fOCO-F, set bits FRA20 to FRA22 in the FRA2 register as follows: *All division mode can be set when VCC = 3.0 V to 5.5 V 000b to 111b *Divide ratio of 4 or more when VCC = 2.7 V to 5.5 V 010b to 111b (divide by 4 or more) *Divide ratio of 8 or more when VCC = 2.2 V to 5.5 V 110b to 111b (divide by 8 or more) After a reset, the on-chip oscillator clock generated by the high-speed on-chip oscillator stops. Oscillation is started by setting the FRA00 bit in the FRA0 register to 1 (high-speed on-chip oscillator on). Frequency correction data is stored in registers FRA4 to FRA7. To adjust the frequency of the high-speed on-chip oscillator clock to 36.864 MHz, first transfer the correction value in the FRA4 register to the FRA1 register and the correction value in the FRA5 register to the FRA3 register before using the values. This enables the setting errors of bit rates such as 9600 bps and 38400 bps to be 0% when the serial interface is used in UART mode (refer to Table 21.8 and Table 22.8 Bit Rate Setting Example in UART Mode). To adjust the frequency of the high-speed on-chip oscillator clock to 32 MHz, first transfer the correction value in the FRA6 register to the FRA1 register and the correction value in the FRA7 register to the FRA3 register before using the values.
REJ09B0458-0010 Rev.0.10 Page 102 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.5
XCIN Clock
The XCIN clock is supplied by the XCIN clock oscillation circuit. This clock is used as the clock source for the CPU and peripheral function clocks. The XCIN clock oscillation circuit is configured by connecting a resonator between the XCIN and XCOUT pins. The XCIN clock oscillation circuit includes an on-chip a feedback resistor, which is disconnected from the oscillation circuit in stop mode in order to reduce the amount of power consumed by the chip. The XCIN clock oscillation circuit may also be configured by feeding an externally generated clock to the XCIN pin. Figure 9.5 shows Examples of XCIN Clock Connection Circuits. During and after a reset, the XCIN clock stops. After setting the CM04 bit in the CM0 register to 1 (XCIN-XCOUT pin), the XCIN clock starts oscillating when the CM03 bit in the CM0 register is set to 1 (XCIN clock oscillates). After the XCIN clock oscillation stabilizes, the XCIN clock is used as the CPU clock source when the CM07 bit in the CM0 register is set to 1 (XCIN clock). To input an externally generated clock to the XCIN pin, also set the CM04 bit in the CM0 register to 1 (XCINXCOUT pin). Leave the XCOUT pin open at this time. This MCU has an on-chip feedback resistor, which can be disabled/enabled by the CM12 bit in the CM1 register. In stop mode, all clocks including the XCIN clock stop. Refer to 9.7 Power Control for details.
* When CM03 bit in CM0 register is set to 0 (XCIN clock oscillates) and CM04 bit is set to 1 (XCIN-XCOUT pin) MCU (on-chip feedback resistor) XCIN Rf (1) XCOUT
* When CM03 bit in CM0 register is set to 1 (XCIN clock stops) and CM04 bit is set to 1 (XCIN-XCOUT pin) MCU (on-chip feedback resistor) XCIN XCOUT Open
Rd (1)
Externally generated clock
CIN
COUT
VCC VSS
External crystal oscillator circuit
External clock input circuit
Note: 1. Insert a damping resistor and feedback resistor if required. The resistance will vary depending on the oscillator and the oscillation drive capacity setting. Use the value recommended by the oscillator manufacturer. When the oscillation drive capacity is set to low, check that oscillation is stable. If the oscillator manufacturer's datasheet specifies that a feedback resistor be added to the chip externally, insert a feedback resistor between XCIN and XCOUT following the instructions.
Figure 9.5
Examples of XCIN Clock Connection Circuits
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.6
CPU Clock and Peripheral Function Clock
There are a CPU clock to operate the CPU and a peripheral function clock to operate the peripheral functions. Refer to Figure 9.1 Clock Generation Circuit (With XIN and XCIN Pins Shared).
9.6.1
System Clock
The system clock is the clock source for the CPU and peripheral function clocks. The XIN clock, the XCIN clock, or the on-chip oscillator clock can be selected.
9.6.2
CPU Clock
The CPU clock is an operating clock for the CPU and the watchdog timer. The system clock divided by 1 (no division), 2, 4, 8, or 16 is used as the CPU clock. Use the CM06 bit in the CM0 register and bits CM16 and CM17 in the CM1 register to select the value of the division. Also, use the XCIN clock while the XCIN clock oscillation stabilizes. After a reset, the low-speed on-chip oscillator clock divided by 1 (no division) is used as the CPU clock. When the MCU enters stop mode, the CM06 bit is set to 1 (divide-by-8 mode). To enter stop mode, set the CM35 bit in the CM3 register to 0 (settings of CM06 in CM0 register and bits CM16 and CM17 in CM1 register enabled).
9.6.3
Peripheral Function Clock (f1, f2, f4, f8, and f32)
The peripheral function clock is an operating clock for the peripheral functions. The fi (i = 1, 2, 4, 8, and 32) clock is generated by the system clock divided by i. It is used for timers RA, RB, RC, RE, the serial interface, and the A/D converter. If the MCU enters wait mode after the CM02 bit in the CM0 register is set to 1 (peripheral function clock stops in wait mode), the fi clock stops.
9.6.4
fOCO
fOCO is an operating clock for the peripheral functions. This clock runs at the same frequency as the on-chip oscillator clock and can be used as the source for timer RA. In wait mode, the fOCO clock does not stop.
9.6.5
fOCO40M
fOCO40M is used as the count source for timer RC. This clock is generated by the high-speed on-chip oscillator and supplied by setting the FRA00 bit to 1. In wait mode, the fOCO40M clock does not stop. This clock can be used with supply voltage VCC = 3.0 to 5.5 V.
9.6.6
fOCO-F
fOCO-F is used as the count source for timer RC and the A/D converter. fOCO-F is a clock generated by the high-speed on-chip oscillator and divided by i (i = 2, 3, 4, 5, 6, 7, 8, and 9; divide ratio selected by the FRA2 register). This clock is supplied by setting the FRA00 bit to 1. In wait mode, the fOCO-F clock does not stop.
REJ09B0458-0010 Rev.0.10 Page 104 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.6.7
fOCO-S
fOCO-S is an operating clock for the voltage detection circuit. This clock is generated by the low-speed on-chip oscillator and supplied by setting the CM14 bit to 0 (lowspeed on-chip oscillator on). In wait mode, the fOCO-S clock does not stop.
9.6.8
fOCO128
fOCO128 is a clock generated by dividing fOCO-S or fOCO-F by 128. When the FRA03 bit is set to 0, fOCOS divided by 128 is selected. When this bit is set to 1, fOCO-F divided by 128 is selected. fOCO128 is configured as the capture signal used in the TRCGRA register for timer RC.
9.6.9
fC, fC2, fC4, and fC32
fC, fC2, fC4, and fC32 are used for timers RA, RE, and the serial interface. Use theses clocks while the XCIN clock oscillation stabilizes.
9.6.10
fOCO-WDT
fOCO-WDT is an operating clock for the watchdog timer. This clock is generated by the low-speed on-chip oscillator for the watchdog timer and supplied by setting the CSPRO bit in the CSPR register to 1 (count source protect mode enabled). In count source protection mode for the watchdog timer, the fOCO-WDT clock does not stop.
REJ09B0458-0010 Rev.0.10 Page 105 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.7
Power Control
There are three power control modes. All modes other than wait mode and stop mode are referred to as standard operating mode.
9.7.1
Standard Operating Mode
Standard operating mode is further separated into four modes. In standard operating mode, the CPU and peripheral function clocks are supplied to operate the CPU and the peripheral functions. Power consumption control is enabled by controlling the CPU clock frequency. The higher the CPU clock frequency, the more processing power increases. The lower the CPU clock frequency, the more power consumption decreases. If unnecessary oscillator circuits stop, power consumption is further reduced. Before the clock sources for the CPU clock can be switched over, the new clock source needs to be oscillating and stable. If the new clock source is the XIN clock or XCIN clock, allow sufficient wait time in a program until oscillation stabilizes before the MCU exits. Table 9.2 Settings and Modes of Clock Associated Bits
OCD Register OCD2 High-speed clock mode No division Divide-by-2 Divide-by-4 Divide-by-8 Divide-by-16 No division Divide-by-2 Divide-by-4 Divide-by-8 Divide-by-16 No division Divide-by-2 Divide-by-4 Divide-by-8 Divide-by-16 No division Divide-by-2 Divide-by-4 Divide-by-8 Divide-by-16 0 0 0 0 0 - - - - - 1 1 1 1 1 1 1 1 1 1 CM1 Register CM0 Register FRA0 Register
Modes
Low-speed clock mode
High-speed on-chip oscillator mode
Low-speed on-chip oscillator mode
CM17, CM14 CM13 CM07 CM06 CM05 CM04 CM03 FRA01 FRA00 CM16 00b - 1 0 0 0 - - - - 01b - 1 0 0 0 - - - - 10b - 1 0 0 0 - - - - - - 1 0 1 0 - - - - 11b - 1 0 0 0 - - - - 00b - - 1 0 - 1 0 - - 01b - - 1 0 - 1 0 - - 10b - - 1 0 - 1 0 - - - - - 1 1 - 1 0 - - 11b - - 1 0 - 1 0 - - 00b - - 0 0 - - - 1 1 01b - - 0 0 - - - 1 1 10b - - 0 0 - - - 1 1 - - - 0 1 - - - 1 1 11b - - 0 0 - - - 1 1 00b 0 - 0 0 - - - 0 - 01b 0 - 0 0 - - - 0 - 10b 0 - 0 0 - - - 0 - - 0 - 0 1 - - - 0 - 11b 0 - 0 0 - - - 0 -
-: Indicates that either 0 or 1 can be set.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
9. Clock Generation Circuit
9.7.1.1
High-Speed Clock Mode
The XIN clock divided by 1 (no division), 2, 4, 8, or 16 is used as the CPU clock. If the CM14 bit is set to 0 (low-speed on-chip oscillator on) or the FRA00 bit in the FRA0 register is set to 1 (high-speed on-chip oscillator on), fOCO can be used for timer RA. Also, if the FRA00 bit is set to 1, fOCO40M can be used for timer RC. If the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection circuit.
9.7.1.2
Low-Speed Clock Mode
The XCIN clock divided by 1 (no division), 2, 4, 8, or 16 is used as the CPU clock. In this mode, low consumption operation is enabled by stopping the XIN clock and the high-speed on-chip oscillator, and by setting the FMR27 bit in the FMR2 register to 1 (flash memory low-consumption-current read mode enabled). Also, if the FRA00 bit is set to 1, fOCO40M can be used for timer RC. If the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection circuit. To enter wait mode from low-speed clock mode, lower consumption current in wait mode is enabled by setting the VCA20 bit in the VCA2 register to 1 (internal power low consumption enabled). To reduce the power consumption, refer to 31. Reducing Power Consumption.
9.7.1.3
High-Speed On-Chip Oscillator Mode
The high-speed on-chip oscillator is used as the on-chip oscillator clock when the FRA00 bit in the FRA0 register is set to 1 (high-speed on-chip oscillator on) and the FRA01 bit in the FRA0 register is set to 1. The onchip oscillator divided by 1 (no division), 2, 4, 8, or 16 is used as the CPU clock. If the FRA00 bit is set to 1, fOCO40M can be used for timer RC. Also, if the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection circuit.
9.7.1.4
Low-Speed On-Chip Oscillator Mode
If the CM14 bit in the CM1 register is set to 0 (low-speed on-chip oscillator on) and the FRA01 bit in the FRA0 register is set to 0, the low-speed on-chip oscillator is used as the on-chip oscillator clock. At this time, the onchip oscillator clock divided by 1 (no division), 2, 4, 8 or 16 is used as the CPU clock. The on-chip oscillator clock is also the clock source for the peripheral function clocks. If the FRA00 bit is set to 1, fOCO40M can be used for timer RC. Also, if the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection circuit. In this mode, low consumption operation is enabled by stopping the XIN clock and the high-speed on-chip oscillator, and by setting the FMR27 bit in the FMR2 register to 1 (flash memory low-consumption-current read mode enabled). To enter wait mode from low-speed clock mode, lower consumption current in wait mode is enabled by setting the VCA20 bit in the VCA2 register to 1 (internal power low consumption enabled). To reduce the power consumption, refer to 31. Reducing Power Consumption.
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R8C/32A Group
9. Clock Generation Circuit
9.7.2
Wait Mode
Since the CPU clock stops in wait mode, the CPU operating with the CPU clock and the watchdog timer when count source protection mode is disabled stop. Since the XIN clock, XCIN clock, and on-chip oscillator clock do not stop, the peripheral functions using these clocks continue operating.
9.7.2.1
Peripheral Function Clock Stop Function
If the CM02 bit is set to 1 (peripheral function clock stops in wait mode), the f1, f2, f4, f8, and f32 clocks stop in wait mode. This reduces power consumption.
9.7.2.2
Entering Wait Mode
The MCU enters wait mode by executing the WAIT instruction or setting the CM30 bit in the CM3 register to 1 (MCU enters wait mode). When the OCD2 bit in the OCD register is set to 1 (on-chip oscillator selected as system clock), set the OCD1 bit in the OCD register to 0 (oscillation stop detection interrupt disabled) before executing the WAIT instruction or setting the CM30 bit in the CM3 register to 1(MCU enters wait mode). If the MCU enters wait mode while the OCD1 bit is set to 1 (oscillation stop detection interrupt enabled), current consumption is not reduced because the CPU clock does not stop.
9.7.2.3
Pin Status in Wait Mode
The I/O port retains the status immediately before the MCU enters wait mode.
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9. Clock Generation Circuit
9.7.2.4
Exiting Wait Mode
The MCU exits wait mode by a reset or peripheral function interrupt. The peripheral function interrupts are affected by the CM02 bit. When the CM02 bit is set to 0 (peripheral function clock does not stop in wait mode), the peripheral function interrupts other than A/D conversion interrupts can be used to exit wait mode. When the CM02 bit is set to 1 (peripheral function clock stops in wait mode), the peripheral functions using the peripheral function clock stop and the peripheral functions operating with external signals or the on-chip oscillator clock can be used to exit wait mode. Table 9.3 lists Interrupts to Exit Wait Mode and Usage Conditions. Table 9.3 Interrupts to Exit Wait Mode and Usage Conditions CM02 = 0 CM02 = 1 Usable when operating with internal Usable when operating with external or external clock clock Usable in all modes (Do not use)
Interrupt Serial interface interrupt Synchronous serial communication unit interrupt / I2C bus interface interrupt Key input interrupt A/D conversion interrupt Timer RA interrupt
Usable (Do not use) Usable in all modes
Timer RB interrupt Timer RC interrupt Timer RE interrupt INT interrupt Voltage monitor 1 interrupt Voltage monitor 2 interrupt Oscillation stop detection interrupt Comparator A1 interrupt Comparator A2 interrupt
Usable in all modes Usable in all modes Usable in all modes Usable Usable Usable Usable Usable Usable
Usable (Do not use) Usable if there is no filter in event counter mode. Usable by selecting fOCO, fC, or fC32 as count source. (Do not use) (Do not use) Usable when operating in real time clock mode Usable (INT0, INT1, INT3 can be used if there is no filter.) Usable Usable (Do not use) Usable Usable
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R8C/32A Group
9. Clock Generation Circuit
Figure 9.6 shows the Time from Wait Mode to Interrupt Routine Execution after CM30 Bit in CM3 Register is Set to 1 (MCU Enters Wait Mode). To use a peripheral function interrupt to exit wait mode, set up the following before setting the CM30 bit to 1. (1) Set the interrupt priority level in bits ILVL2 to ILVL0 in the interrupt control registers of the peripheral function interrupts to be used for exiting wait mode. Set bits ILVL2 to ILVL0 of the peripheral function interrupts that are not to be used for exiting wait mode to 000b (interrupt disabled). (2) Operate the peripheral function to be used for exiting wait mode. When the MCU exits by a peripheral function interrupt, the time (number of cycles) between interrupt request generation and interrupt routine execution is determined by the settings of the FMSTP bit in the FMR0 register and the VCA20 bit in the VCA2 register, as shown in Figure 9.6. The clock set by bits CM35, CM36, and CM37 in the CM3 register is used as the CPU clock when the MCU exits wait mode by a peripheral function interrupt. At this time, the CM06 bit in the CM0 register and bits CM16 and CM17 in the CM1 register automatically change.
FMR0 Register
VCA2 Register
FMSTP Bit
VCA20 Bit 0 (internal power low consumption disabled) 1 (internal power low consumption enabled) 0 (internal power low consumption disabled 1 (internal power low consumption enabled)
Internal Power Stabilization Time (T0)
Time until Flash Memory Activation (T1)
Time until CPU Clock Supply (T2)
Time for Interrupt Sequence (T3)
Remarks
0 s Period of system clock Period of CPU clock Period of CPU clock x 1 cycle + 60 s x 2 cycles x 20 cycles (max.) 100 s (max.) The total of T0 to T3 is the time from wait mode to interrupt routine execution. Period of system clock x 1 cycle 100 s (max.) Same as above Same as above
0 (flash memory operates)
0 s
1 (flash memory stops)
T0 Internal power stabilization time 100 s (max.) Interrupt request generation
T1 Flash memory activation sequence
T2 CPU clock restart sequence
T3
Wait mode
Interrupt sequence
Figure 9.6
Time from Wait Mode to Interrupt Routine Execution after CM30 Bit in CM3 Register is Set to 1 (MCU Enters Wait Mode)
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R8C/32A Group
9. Clock Generation Circuit
Figure 9.7 shows the Time from Wait Mode to Interrupt Routine Execution after WAIT instruction is Executed. To use a peripheral function interrupt to exit wait mode, set up the following before executing the WAIT instruction. (1) Set the interrupt priority level in bits ILVL2 to ILVL0 of the peripheral function interrupts to be used for exiting stop mode. Set bits ILVL2 to ILVL0 of the peripheral function interrupts that are not to be used for exiting stop mode to 000b (interrupt disabled). (2) Set the I flag to 1. (3) Operate the peripheral function to be used for exiting stop mode. When the MCU exits by a peripheral function interrupt, the time (number of cycles) between interrupt request generation and interrupt routine execution is determined by the settings of the FMSTP bit in the FMR0 register and the VCA20 bit in the VCA2 register, as shown in Figure 9.7. The clock set by bits CM35, CM36, and CM37 in the CM3 register is used as the CPU clock when the MCU exits wait mode by a peripheral function interrupt. At this time, the CM06 bit in the CM0 register and bits CM16 and CM17 in the CM1 register automatically change.
FMR0 Register
VCA2 Register
FMSTP Bit
VCA20 Bit 0 (internal power low consumption disabled) 1 (internal power low consumption enabled) 0 (internal power low consumption disabled 1 (internal power low consumption enabled)
Internal Power Stabilization Time (T0)
Time until Flash Memory Activation (T1)
Time until CPU Clock Supply (T2)
Time for Interrupt Sequence (T3)
Remarks
0 s Period of system clock Period of CPU clock Period of CPU clock x 1 cycle + 60 s x 2 cycles x 20 cycles (max.) 100 s (max.) The total of T0 to T3 is the time from wait mode to interrupt routine execution. Period of system clock x 1 cycle 100 s (max.) Same as above Same as above
0 (flash memory operates)
0 s
1 (flash memory stops)
T0 Internal power stabilization time 100 s (max.) Interrupt request generation
T1 Flash memory activation sequence
T2 CPU clock restart sequence
T3
Wait mode
Interrupt sequence
Figure 9.7
Time from Wait Mode to Interrupt Routine Execution after WAIT instruction is Executed
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R8C/32A Group
9. Clock Generation Circuit
9.7.3
Stop Mode
Since all oscillator circuits except fOCO-WDT stop in stop mode, the CPU and peripheral function clocks stop and the CPU and the peripheral functions operating with these clocks also stop. The least power required to operate the MCU is in stop mode. If the voltage applied to the VCC pin is VRAM or more, the contents of internal RAM is retained. The peripheral functions clocked by external signals continue operating. Table 9.4 lists Interrupts to Exit Stop Mode and Usage Conditions. Table 9.4 Interrupts to Exit Stop Mode and Usage Conditions Usage Conditions -
Interrupt Key input interrupt
INT0, INT1, INT3 interrupt Usable if there is no filter Timer RA interrupt Usable if there is no filter when external pulse is counted in event counter mode Serial interface interrupt When external clock selected Voltage monitor 1 interrupt Usable in digital filter disabled mode (VW1C1 bit in VW1C register is set to 1) Voltage monitor 2 interrupt Usable in digital filter disabled mode (VW2C1 bit in VW2C register is set to 1) Comparator A1 interrupt Usable in digital filter disabled mode (VW1C1 bit in VW1C register is set to 1) Comparator A2 interrupt Usable in digital filter disabled mode (VW2C1 bit in VW2C register is set to 1)
9.7.3.1
Entering Stop Mode
The MCU enters stop mode when the CM10 bit in the CM1 register is set to 1 (all clocks stop). At the same time, the CM06 bit in the CM0 register is set to 1 (divide-by-8 mode). To use stop mode, set the following before the MCU enters stop mode: * Bits OCD1 to OCD0 in the OCD register = 00b * CM35 bit in CM3 register = 0 (settings of CM06 bit in CM0 register and bits CM16 and CM17 in CM1 register enabled)
9.7.3.2
Pin Status in Stop Mode
The I/O port retains the status before the MCU enters wait mode. However, when the CM13 bit in the CM1 register is set to 1 (XIN-XOUT pin), the XOUT(P4_7) pin is held "H". When the CM13 bit is set to 0 (input ports P4_6 and P4_7), the P4_7(XOUT pin) is held in an input status.
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9. Clock Generation Circuit
9.7.3.3
Exiting Stop Mode
The MCU exits stop mode by a reset or peripheral function interrupt. Figure 9.8 shows the Time from Stop Mode to Interrupt Routine Execution. To use a peripheral function interrupt to exit stop mode, set up the following before setting the CM10 bit to 1. (1) Set the interrupt priority level in bits ILVL2 to ILVL0 of the peripheral function interrupts to be used for exiting stop mode. Set bits ILVL2 to ILVL0 of the peripheral function interrupts that are not to be used for exiting stop mode to 000b (interrupt disabled). (2) Set the I flag to 1. (3) Operate the peripheral function to be used for exiting stop mode. When the MCU exits stop mode by a peripheral function interrupt, the interrupt sequence is executed when an interrupt request is generated and the CPU clock supply starts. The clock used immediately before stop mode divided by 8 is used as the CPU clock when the MCU exits stop mode by a peripheral function interrupt. To enter stop mode, set the CM35 bit in the CM3 register to 0 (settings of CM06 bit in CM0 register and bits CM16 and CM17 in CM1 register enabled)
FMR0 Register Internal Power Stabilization Time (T0) FMSTP Bit 0 (flash memory operates) 1 (flash memory stops)
Time until Flash Memory Activation (T2)
Time until CPU Clock Supply (T3)
Time for Interrupt Sequence (T4)
Remarks
100 s (max.)
100 s (max.)
Period of system clock Period of CPU clock Period of CPU clock The total of T0 x 1 cycle + 60 s x 2 cycles x 20 cycles to T4 is the time (max.) from wait mode to interrupt routine Period of system clock Same as above Same as above execution. x 1 cycle
T0
T1 Oscillation time of CPU clock source used immediately before stop mode
T2
T3
T4
Stop mode
Internal power stabilization time
Flash memory activation sequence
CPU clock restart sequence
Interrupt sequence
100 ms (max.) Interrupt request generation
Figure 9.8
Time from Stop Mode to Interrupt Routine Execution
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R8C/32A Group Figure 9.9 shows the State Transitions in Power Control Mode.
9. Clock Generation Circuit
State Transitions in Power Control Mode
Reset
Standard operating mode
Low-speed on-chip oscillator mode
CM07 = 0 CM14 = 0 OCD2 = 1 FRA01 = 0
CM14 = 0 OCD2 = 1 FRA01 = 0 CM05 = 0 CM13 = 1 OCD2 = 0 CM03 = 0 CM04 = 1 CM07 = 1
CM03 = 0 CM04 = 1 CM07 = 1 CM07 = 0 CM14 = 0 OCD2 = 1 FRA01 = 0
FRA00 = 1 FRA01 = 1
High-speed clock mode
CM05 = 0 CM07 = 0 CM13 = 1 OCD2 = 0
Low-speed clock mode
CM04 = 1 CM07 = 1 CM03 = 0
OCD2 = 1 FRA00 = 1 FRA01 = 1 CM05 = 0 CM13 = 1 OCD2 = 0
CM14 = 0 FRA01 = 0
CM05 = 0 CM07 = 0 CM13 = 1 OCD2 = 0 CM03 = 0 CM04 = 1 CM07 = 1
High-speed on-chip oscillator mode
CM07 = 0 OCD2 = 1 FRA00 = 1 FRA01 = 1
CM07 = 0 OCD2 = 1 FRA00 = 1 FRA01 = 1
Interrupt
WAIT instruction
Interrupt
CM10 = 1
Wait mode CPU operation stops CM03, CM04, CM05, CM07: Bits in CM0 register CM13, CM14: Bits in CM1 register OCD2: Bit in OCD register FRA00, FRA01: Bits in FRA0 register
Stop mode All oscillators stop (except fOCO-WDT)
Figure 9.9
State Transitions in Power Control Mode
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9. Clock Generation Circuit
9.8
Oscillation Stop Detection Function
The oscillation stop detection function detects the stop of the XIN clock oscillating circuit. The oscillation stop detection function can be enabled and disabled by the OCD0 bit in the OCD register. Table 9.5 lists the Specifications of Oscillation Stop Detection Function. When the XIN clock is the CPU clock source and bits OCD1 to OCD0 are set to 11b, the MCU is placed in the following state if the XIN clock stops. * OCD2 bit in OCD register = 1 (on-chip oscillator clock selected) * OCD3 bit in OCD register = 1 (XIN clock stops) * CM14 bit in CM1 register = 0 (low-speed on-chip oscillator oscillates) * Oscillation stop detection interrupt request is generated Table 9.5 Specifications of Oscillation Stop Detection Function Specification f(XIN) 2 MHz Bits OCD1 to OCD0 set to 11b Oscillation stop detection interrupt generated
Item Oscillation stop detection clock and frequency bandwidth Enabled condition for oscillation stop detection function Operation at oscillation stop detection
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9. Clock Generation Circuit
9.8.1
How to Use Oscillation Stop Detection Function
monitor 2 interrupt, and the watchdog timer interrupt. To use the oscillation stop detection interrupt and watchdog timer interrupt, the interrupt source needs to be determined. Table 9.6 lists the Determination of Interrupt Sources for Oscillation Stop Detection, Watchdog Timer, Voltage Monitor 1, or Voltage Monitor 2 Interrupt. Figure 9.11 shows an Example of Determining Interrupt Sources for Oscillation Stop Detection, Watchdog Timer, Voltage Monitor 1, or Voltage Monitor 2 Interrupt. When the XIN clock restarts after oscillation stop, switch the XIN clock to the clock source for the CPU clock and the peripheral functions by a program. Figure 9.10 shows the Procedure for Switching Clock Source from Low-Speed On-Chip Oscillator to XIN Clock. To enter wait mode while the oscillation stop detection function is used, set the CM02 bit to 0 (peripheral function clock does not stop in wait mode). Since the oscillation stop detection function is a function for cases where the XIN clock is stopped by an external cause, set bits OCD1 to OCD0 to 00b to stop or start the XIN clock by a program (select stop mode or change the CM05 bit). This function cannot be used when the XIN clock frequency is below 2 MHz. In this case, set bits OCD1 to OCD0 to 00b. To use the low-speed on-chip oscillator clock as the clock source for the CPU clock and the peripheral functions after detecting the oscillation stop, set the FRA01 bit in the FRA0 register to 0 (low-speed on-chip oscillator selected) and bits OCD1 to OCD0 to 11b. To use the high-speed on-chip oscillator clock as the clock source for the CPU clock and the peripheral functions after detecting the oscillation stop, first set the FRA00 bit to 1 (high-speed on-chip oscillator oscillates) and the FRA01 bit to 1 (high-speed on-chip oscillator selected). Then set bits OCD1 to OCD0 to 11b.
* The oscillation stop detection interrupt shares a vector with the voltage monitor 1 interrupt, the voltage
*
* *
* *
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9. Clock Generation Circuit
Table 9.6
Determination of Interrupt Sources for Oscillation Stop Detection, Watchdog Timer, Voltage Monitor 1, or Voltage Monitor 2 Interrupt
Generated Interrupt Source Bit Indicating Interrupt Source Oscillation stop detection (a) OCD3 bit in OCD register = 1 ((a) or (b)) (b) OCD1 to OCD0 bits in OCD register = 11b and OCD2 bit = 1 Watchdog timer VW2C3 bit in VW2C register = 1 Voltage monitor 1 VW1C2 bit in VW1C register = 1 Voltage monitor 2 VW2C2 bit in VW2C register = 1
Switch to XIN clock
NO
Check several times whether OCD3 bit is set to 0 (XIN clock oscillates) YES Set bits OCD1 to OCD0 to 00b
Set OCD2 bit to 0 (XIN clock selected)
End
OCD3 to OCD0: Bits in OCD register
Figure 9.10
Procedure for Switching Clock Source from Low-Speed On-Chip Oscillator to XIN Clock
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R8C/32A Group
9. Clock Generation Circuit
Determination of Interrupt sources
OCD3 = 1? (XIN clock stops)
NO
YES
OCD1 = 1 (oscillation stop detection interrupt enabled) and OCD2 = 1 (on-chip oscillator clock selected as system clock)?
NO
YES VW2C3 = 1? (watchdog timer underflow) NO
YES VW2C2 = 1? (Vdet2 passed) NO
YES Set OCD1 bit to 0 (oscillation stop detection interrupt disabled) (1)
To oscillation stop detection interrupt routine
To watchdog timer interrupt routine
To voltage monitor 2 interrupt routine
To voltage monitor 1 interrupt routine
Note: 1. This disables multiple oscillation stop detection interrupts. OCD1 to OCD3: Bits in OCD register VW2C2, VW2C3: Bits in VW2C register
Figure 9.11
Example of Determining Interrupt Sources for Oscillation Stop Detection, Watchdog Timer, Voltage Monitor 1, or Voltage Monitor 2 Interrupt
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9. Clock Generation Circuit
9.9 9.9.1
Notes on Clock Generation Circuit Stop Mode
To enter stop mode, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled) and then the CM10 bit in the CM1 register to 1 (stop mode). An instruction queue pre-reads 4 bytes from the instruction which sets the CM10 bit to 1 (stop mode) and the program stops. Insert at least four NOP instructions following the JMP.B instruction after the instruction which sets the CM10 bit to 1. * Program example to enter stop mode BCLR BSET FSET BSET JMP.B LABEL_001: NOP NOP NOP NOP
1,FMR0 0,PRCR I 0,CM1 LABEL_001
; CPU rewrite mode disabled ; Protect disabled ; Enable interrupt ; Stop mode
9.9.2
Wait Mode
To enter wait mode with the WAIT instruction, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled) and then execute the WAIT instruction. An instruction queue pre-reads 4 bytes from the WAIT instruction and the program stops. Insert at least four NOP instructions after the WAIT instruction. * Program example to execute the WAIT instruction BCLR 1,FMR0 FSET I WAIT NOP NOP NOP NOP
; CPU rewrite mode disabled ; Enable interrupt ; Wait mode
9.9.3
Oscillation Stop Detection Function
Since the oscillation stop detection function cannot be used if the XIN clock frequency is below 2 MHz, set bits OCD1 to OCD0 to 00b.
9.9.4
Oscillation Circuit Constants
Consult the oscillator manufacturer to determine the optimal oscillation circuit constants for the user system. To use the MCU with supply voltage below VCC = 2.7 V, it is recommended to set the CM11 bit in the CM1 register to 1 (on-chip feedback resistor disabled) and connect the feedback resistor to the chip externally.
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10. Protection
10. Protection
The protection function protects important registers from being easily overwritten if a program runs out of control. The registers protected by the PRCR register are as follows: * Registers protected by PRC0 bit: Registers CM0, CM1, CM3, OCD, FRA0, FRA1, FRA2, and FRA3 * Registers protected by PRC1 bit: Registers PM0 and PM1 * Registers protected by PRC3 bit: Registers OCVREFCR, VCA2, VD1LS, VW0C, VW1C, and VW2C
10.1 10.1.1
Register Protect Register (PRCR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 PRC3 0 b2 -- 0 b1 PRC1 0 b0 PRC0 0 R/W R/W
Address 000Ah Bit b7 Symbol -- After Reset 0 Bit b0
Symbol Bit Name PRC0 Protect bit 0
b1
PRC1
Protect bit 1
b2 b3
-- PRC3
Reserved bit Protect bit 3
b4 b5 b6 b7
-- -- -- --
Reserved bits Reserved bits
Function Enables writing to registers CM0, CM1, CM3, OCD, FRA0, FRA1, FRA2, and FRA3. 0: Write disabled 1: Write enabled Enables writing to registers PM0 and PM1. 0: Write disabled 1: Write enabled Set to 0. Enables writing to registers OCVREFCR, VCA2, VD1LS, VW0C, VW1C, and VW2C. 0: Write disabled 1: Write enabled Set to 0. When read, the content is 0.
R/W
R/W R/W
R/W R
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R8C/32A Group
11. Interrupts
11. Interrupts
11.1 11.1.1 Overview Types of Interrupts
Figure 11.1 shows the Types of Interrupts.
Software (non-maskable interrupts)
Undefined instruction (UND instruction) Overflow (INTO instruction) BRK instruction INT instruction Watchdog timer Oscillation stop detection Voltage monitor 1/comparator A1 (3) Voltage monitor 2/comparator A2 (3) Single step (2) Address break (2) Address match
Interrupts Special (non-maskable interrupts) Hardware Peripheral function (1) (maskable interrupts)
Notes: 1. Peripheral function interrupts are generated by the peripheral functions in the MCU. 2. Do not use these interrupts. This is provided exclusively for use by development tools. 3. A non-maskable or maskable interrupt can be selected by bits IRQ1SEL and IRQ2SEL in the CMPA register.
Figure 11.1
Types of Interrupts
* Maskable interrupts: * Non-maskable interrupts:
These interrupts are enabled or disabled by the interrupt enable flag (I flag). The interrupt priority can be changed based on the interrupt priority level. These interrupts are not enabled or disabled by the interrupt enable flag (I flag). The interrupt priority cannot be changed based on the interrupt priority level.
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11. Interrupts
11.1.2
Software Interrupts
A software interrupt is generated when an instruction is executed. Software interrupts are non-maskable.
11.1.2.1
Undefined Instruction Interrupt
An undefined instruction interrupt is generated when the UND instruction is executed.
11.1.2.2
Overflow Interrupt
An overflow interrupt is generated when the O flag is set to 1 (arithmetic operation overflow) and the INTO instruction is executed. Instructions that set the O flag are as follows: ABS, ADC, ADCF, ADD, CMP, DIV, DIVU, DIVX, NEG, RMPA, SBB, SHA, and SUB.
11.1.2.3
BRK Interrupt
A BRK interrupt is generated when the BRK instruction is executed.
11.1.2.4
INT Instruction Interrupt
An INT instruction interrupt is generated when the INT instruction is executed. Software interrupt numbers 0 to 63 can be specified with the INT instruction. Because some software interrupt numbers are assigned to peripheral function interrupts, the same interrupt routine as for peripheral function interrupts can be executed by executing the INT instruction. For software interrupt numbers 0 to 31, the U flag is saved on the stack during instruction execution and the U flag is set to 0 (ISP selected) before the interrupt sequence is executed. The U flag is restored from the stack when returning from the interrupt routine. For software interrupt numbers 32 to 63, the U flag does not change state during instruction execution, and the selected SP is used.
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11. Interrupts
11.1.3
Special Interrupts
Special interrupts are non-maskable.
11.1.3.1
Watchdog Timer Interrupt
A watchdog timer interrupt is generated by the watchdog timer. For details, refer to 14. Watchdog Timer.
11.1.3.2
Oscillation Stop Detection Interrupt
An oscillation stop detection interrupt is generated by the oscillation stop detection function. For details of the oscillation stop detection function, refer to 9. Clock Generation Circuit.
11.1.3.3
Voltage Monitor 1/Comparator A1 Interrupt
A voltage monitor 1/comparator A1 interrupt is generated by the voltage detection circuit or the comparator A. A non-maskable or maskable interrupt can be selected by IRQ1SEL bit in the CMPA register. For details of the voltage detection circuit, refer to 6. Voltage Detection Circuit and for details of the comparator A, refer to 28. Comparator A.
11.1.3.4
Voltage Monitor 2/Comparator A2 Interrupt
A voltage monitor 2/comparator A2 interrupt is generated by the voltage detection circuit or the comparator A. A non-maskable or maskable interrupt can be selected by IRQ2SEL bit in the CMPA register. For details of the voltage detection circuit, refer to 6. Voltage Detection Circuit and for details of the comparator A, refer to 28. Comparator A.
11.1.3.5
Single-Step Interrupt, and Address Break Interrupt
Do not use these interrupts. They are provided exclusively for use by development tools.
11.1.3.6
Address Match Interrupt
An address match interrupt is generated immediately before executing an instruction that is stored at an address indicated by registers RMAD0 to RMAD1 if the AIER0 bit in the AIER0 register or the AIER1 bit in the AIER1 register is set to 1 (address match interrupt enabled). For details of the address match interrupt, refer to 11.6 Address Match Interrupt.
11.1.4
Peripheral Function Interrupts
A peripheral function interrupt is generated by a peripheral function in the MCU. Peripheral function interrupts are maskable. Refer to Table 11.2 Relocatable Vector Tables for sources of the corresponding peripheral function interrupt. For details of peripheral functions, refer to the descriptions of individual peripheral functions.
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11. Interrupts
11.1.5
Interrupts and Interrupt Vectors
There are 4 bytes in each vector. Set the starting address of an interrupt routine in each interrupt vector. When an interrupt request is acknowledged, the CPU branches to the address set in the corresponding interrupt vector. Figure 11.2 shows an Interrupt Vector.
MSB
LSB
Vector address (L)
Low-order address Middle-order address 0000 High-order address 0000
Vector address (H)
Figure 11.2 Interrupt Vector
0000
11.1.5.1
Fixed Vector Tables
The fixed vector tables are allocated addresses 0FFDCh to 0FFFFh. Table 11.1 lists the Fixed Vector Tables. The vector addresses (H) of fixed vectors are used by the ID code check function. For details, refer to 30.3 Functions to Prevent Flash Memory from being Rewritten. Table 11.1 Fixed Vector Tables Vector Addresses Remarks Reference Address (L) to (H) 0FFDCh to 0FFDFh Interrupt with R8C/Tiny Series UND instruction Software Manual 0FFE0h to 0FFE3h Interrupt with INTO instruction 0FFE4h to 0FFE7h If the content of address 0FFE7h is FFh, program execution starts from the address shown by the vector in the relocatable vector table. 0FFE8h to 0FFEBh 11.6 Address Match Interrupt 0FFECh to 0FFEFh 14. Watchdog Timer 9. Clock Generation Circuit 6. Voltage Detection Circuit 28. Comparator A
Interrupt Source Undefined instruction Overflow BRK instruction
Address match
Single step (1) 0FFF0h to 0FFF3h Watchdog timer, Oscillation stop detection, Voltage monitor 1/comparator A1, Voltage monitor 2/comparator A2 0FFF4h to 0FFF7h Address break (1) (Reserved) Reset
0FFF8h to 0FFFBh 0FFFCh to 0FFFFh
5. Resets
Note: 1. Do not use these interrupts. They are provided exclusively for use by development tools.
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11. Interrupts
11.1.5.2
Relocatable Vector Tables
The relocatable vector tables occupy 256 bytes beginning from the starting address set in the INTB register. Table 11.2 lists the Relocatable Vector Tables. Table 11.2 Relocatable Vector Tables
Vector Addresses (1) Address (L) to Address (H) +0 to +3 (0000h to 0003h) +4 to +7 (0004h to 0007h) +24 to +27 (0018h to 001Bh) +28 to +31 (001Ch to 001Fh) +32 to +35 (0020h to 0023h) +36 to +39 (0024h to 0027h) +40 to +43 (0028h to 002Bh) +44 to +47 (002Ch to 002Fh) +48 to +51 (0030h to 0033h) +52 to +55 (0034h to 0037h) +56 to +59 (0038h to 003Bh) +60 to +63 (003Ch to 003Fh) Software Interrupt Control Reference Interrupt Register Number 0 - R8C/Tiny Series Software Manual 1 FMRDYIC 30. Flash Memory 2 to 5 - - 6 - - 7 TRCIC 19. Timer RC 8 - - 9 - - 10 TREIC 20. Timer RE 11 S2TIC 22. Serial Interface (UART2) 12 S2RIC 13 14 15 KUPIC ADIC SSUIC/IICIC 11.5 Key Input Interrupt 27. A/D Converter 24. Synchronous Serial Communication Unit (SSU), 25. I2C bus Interface - 21. Serial Interface (UART0) - - - 17. Timer RA - 18. Timer RB 11.4 INT Interrupt - - 11.4 INT Interrupt 22. Serial Interface (UART2) - R8C/Tiny Series Software Manual - 6. Voltage Detection Circuit 28. Comparator A - R8C/Tiny Series Software Manual
Interrupt Source BRK instruction (3) Flash memory ready (Reserved) (Reserved) Timer RC (Reserved) (Reserved) Timer RE UART2 transmit/NACK2 UART2 receive/ACK2 Key input A/D conversion Synchronous serial communication unit / I2C bus interface (2) (Reserved) UART0 transmit UART0 receive (Reserved) (Reserved) (Reserved) Timer RA (Reserved) Timer RB INT1 INT3 (Reserved) (Reserved)
+68 to +71 (0044h to 0047h) +72 to +75 (0048h to 004Bh)
+84 to +87 (0054h to 0057h) +88 to +91 (0058h to 005Bh) +96 to +99 (0060h to 0063h) +100 to +103 (0064h to 0067h) +104 to +107 (0068h to 006Bh)
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
- S0TIC S0RIC - - - TRAIC - TRBIC INT1IC INT3IC - - INT0IC U2BCNIC - - - VCMP1IC VCMP2IC - -
+116 to +119 (0074h to 0077h) INT0 UART2 bus collision detection +120 to +123 (0078h to 007Bh) (Reserved) Software
(3)
(Reserved) Voltage monitor 1/ comparator A1 Voltage monitor 2/ comparator A2 (Reserved) Software (3)
31 +128 to +131 (0080h to 0083h) to 32 to 41 +164 to +167 (00A4h to 00A7h) 42 to 49 +200 to +203 (00C8h to 00CBh) 50 +204 to +207 (00CCh to 00CFh) 51
52 to 55 +224 to +227 (00E0h to 00E3h) to 56 to 63 +252 to +255 (00FCh to 00FFh)
Notes: 1. These addresses are relative to those in the INTB register. 2. Selectable by the IICSEL bit in the SSUIICSR register. 3. These interrupts are not disabled by the I flag.
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11. Interrupts
11.2 11.2.1
Registers Interrupt Control Register (TREIC, S2TIC, S2RIC, KUPIC, ADIC, S0TIC, S0RIC, TRAIC, TRBIC, U2BCNIC, VCMP1IC, VCMP2IC)
Address 004Ah (TREIC), 004Bh (S2TIC), 004Ch (S2RIC), 004Dh (KUPIC), 004Eh (ADIC), 0051h (S0TIC), 0052h (S0RIC), 0056h (TRAIC), 0058h (TRBIC), 005Eh (U2BCNIC), 0072h (VCMP1IC), 0073h (VCMP2IC), Bit b7 b6 b5 b4 b3 b2 b1 b0 Symbol -- -- -- -- IR ILVL2 ILVL1 ILVL0 After Reset X X X X X 0 0 0 Bit b0 b1 b2 Symbol Bit Name ILVL0 Interrupt priority level select bit ILVL1 ILVL2 Function
b2 b1 b0
b3 b4 b5 b6 b7
IR -- -- -- --
0 0 0: Level 0 (interrupt disabled) 0 0 1: Level 1 0 1 0: Level 2 0 1 1: Level 3 1 0 0: Level 4 1 0 1: Level 5 1 1 0: Level 6 1 1 1: Level 7 Interrupt request bit 0: No interrupt requested 1: Interrupt requested Nothing is assigned. If necessary, set to 0. When read, the content is undefined.
R/W R/W R/W R/W
R/W
(1)
--
Note: 1. Only 0 can be written to the IR bit. Do not write 1 to this bit.
Rewrite the interrupt control register when an interrupt request corresponding to the register is not generated. Refer to 11.8.5 Rewriting Interrupt Control Register.
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11. Interrupts
11.2.2
Interrupt Control Register (FMRDYIC TRCIC, SSUIC/IICIC)
b7 -- X b6 -- X b5 -- X b4 -- X b3 IR X b2 ILVL2 0 b1 ILVL1 0 Function
b2 b1 b0
Address 0041h (FMRDYIC), 0047h (TRCIC), 004Fh (SSUIC/IICIC (1)) Bit Symbol After Reset Bit b0 b1 b2 b0 ILVL0 0 R/W R/W R/W R/W
Symbol Bit Name ILVL0 Interrupt priority level select bit ILVL1 ILVL2
b3 b4 b5 b6 b7
IR -- -- -- --
0 0 0: Level 0 (interrupt disabled) 0 0 1: Level 1 0 1 0: Level 2 0 1 1: Level 3 1 0 0: Level 4 1 0 1: Level 5 1 1 0: Level 6 1 1 1: Level 7 Interrupt request bit 0: No interrupt requested 1: Interrupt requested Nothing is assigned. If necessary, set to 0. When read, the content is undefined.
R --
Note: 1. Selectable by the IICSEL bit in the SSUIICSR register.
Rewrite the interrupt control register when an interrupt request corresponding to the register is not generated. Refer to 11.8.5 Rewriting Interrupt Control Register.
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11. Interrupts
11.2.3
INTi Interrupt Control Register (INTiIC) (i = 0, 1, 3)
b2 ILVL2 0 b1 ILVL1 0 Function
b2 b1 b0
Address 0059h (INT1IC), 005Ah (INT3IC), 005Dh (INT0IC) Bit b7 b6 b5 b4 b3 Symbol -- -- -- POL IR After Reset X X 0 0 X Bit b0 b1 b2 Symbol Bit Name ILVL0 Interrupt priority level select bit ILVL1 ILVL2
b0 ILVL0 0 R/W R/W R/W R/W
b3 b4 b5 b6 b7
IR POL -- -- --
0 0 0: Level 0 (interrupt disabled) 0 0 1: Level 1 0 1 0: Level 2 0 1 1: Level 3 1 0 0: Level 4 1 0 1: Level 5 1 1 0: Level 6 1 1 1: Level 7 Interrupt request bit 0: No interrupt requested 1: Interrupt requested 0: Falling edge selected Polarity switch bit (3) 1: Rising edge selected (2) Reserved bit Set to 0. Nothing is assigned. If necessary, set to 0. When read, the content is undefined.
R/W
(1)
R/W R/W --
Notes: 1. Only 0 can be written to the IR bit. Do not write 1 to this bit. 2. If the INTiPL bit in the INTEN register is set to 1 (both edges), set the POL bit to 0 (falling edge selected). 3. The IR bit may be set to 1 (interrupt requested) when the POL bit is rewritten. Refer to 11.8.4 Changing Interrupt Sources.
Rewrite the interrupt control register when an interrupt request corresponding to the register is not generated. Refer to 11.8.5 Rewriting Interrupt Control Register.
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11. Interrupts
11.3
Interrupt Control
The following describes enabling and disabling maskable interrupts and setting the acknowledgement priority. This description does not apply to non-maskable interrupts. Use the I flag in the FLG register, IPL, and bits ILVL2 to ILVL0 in the corresponding interrupt control register to enable or disable a maskable interrupt. Whether an interrupt is requested or not is indicated by the IR bit in the corresponding interrupt control register.
11.3.1
I Flag
The I flag enables or disables maskable interrupts. Setting the I flag to 1 (enabled) enables maskable interrupts. Setting the I flag to 0 (disabled) disables all maskable interrupts.
11.3.2
IR Bit
The IR bit is set to 1 (interrupt requested) when an interrupt request is generated. After the interrupt request is acknowledged and the CPU branches to the corresponding interrupt vector, the IR bit is set to 0 (no interrupt requested). The IR bit can be set to 0 by a program. Do not write 1 to this bit. However, the IR bit operations of the timer RC interrupt, the synchronous serial communication unit interrupt, the I2C bus interface interrupt, and the flash memory interrupt are different. Refer to 11.7 Timer RC Interrupt, Synchronous Serial Communication Unit Interrupt, I2C bus Interface Interrupt, and Flash Memory Interrupt (Interrupts with Multiple Interrupt Request Sources).
11.3.3
Bits ILVL2 to ILVL0, IPL
Interrupt priority levels can be set using bits ILVL2 to ILVL0. Table 11.3 lists the Settings of Interrupt Priority Levels and Table 11.4 lists the Interrupt Priority Levels Enabled by IPL. The following are the conditions when an interrupt is acknowledged: * I flag = 1 * IR bit = 1 * Interrupt priority level > IPL The I flag, IR bit, bits ILVL2 to ILVL0, and IPL are independent of each other. They do not affect one another.
Table 11.3
Bits ILVL2 to ILVL0 000b 001b 010b 011b 100b 101b 110b 111b
Settings of Interrupt Priority Levels
Interrupt Priority Level Level 0 (interrupt disabled) Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7 Priority - Low
Table 11.4
IPL 000b 001b 010b 011b 100b 101b 110b 111b
Interrupt Priority Levels Enabled by IPL
Enabled Interrupt Priority Level Interrupt level 1 and above Interrupt level 2 and above Interrupt level 3 and above Interrupt level 4 and above Interrupt level 5 and above Interrupt level 6 and above Interrupt level 7 and above All maskable interrupts are disabled
High
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11. Interrupts
11.3.4
Interrupt Sequence
The following describes an interrupt sequence which is performed from when an interrupt request is acknowledged until the interrupt routine is executed. When an interrupt request is generated while an instruction is being executed, the CPU determines its interrupt priority level after the instruction is completed. The CPU starts the interrupt sequence from the following cycle. However, for the SMOVB, SMOVF, SSTR, or RMPA instruction, if an interrupt request is generated while the instruction is being executed, the MCU suspends the instruction to start the interrupt sequence. The interrupt sequence is performed as indicated below. Figure 11.3 shows the Time Required for Executing Interrupt Sequence. (1) The CPU obtains interrupt information (interrupt number and interrupt request level) by reading address 00000h. The IR bit for the corresponding interrupt is set to 0 (no interrupt requested). (2) (2) The FLG register is saved to a temporary register (1) in the CPU immediately before entering the interrupt sequence. (3) The I, D and U flags in the FLG register are set as follows: The I flag is set to 0 (interrupts disabled). The D flag is set to 0 (single-step interrupt disabled). The U flag is set to 0 (ISP selected). However, the U flag does not change state if an INT instruction for software interrupt number 32 to 63 is executed. (4) The CPU internal temporary register (1) is saved on the stack. (5) The PC is saved on the stack. (6) The interrupt priority level of the acknowledged interrupt is set in the IPL. (7) The starting address of the interrupt routine set in the interrupt vector is stored in the PC. After the interrupt sequence is completed, instructions are executed from the starting address of the interrupt routine.
1 CPU Clock Address Bus Data Bus RD WR
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Address 0000h Interrupt information
Undefined Undefined Undefined
SP-2
SP-1
SP-4
SP-3
SP-3 contents
VEC
VEC contents
VEC+1
VEC+1 contents
VEC+2
VEC+2 contents
PC
SP-2 SP-1 SP-4 contents contents contents
Note: The indeterminate state depends on the instruction queue buffer. A read cycle occurs when the instruction queue buffer is ready to acknowledge instructions.
Figure 11.3
Time Required for Executing Interrupt Sequence
Notes: 1. These registers cannot be accessed by the user. 2. Refer to 11.7 Timer RC Interrupt, Synchronous Serial Communication Unit Interrupt, I2C bus Interface Interrupt, and Flash Memory Interrupt (Interrupts with Multiple Interrupt Request Sources) for the IR bit operations of the timer RC Interrupt, the Synchronous Serial Communication unit Interrupt, and the I2C bus Interface Interrupt.
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11. Interrupts
11.3.5
Interrupt Response Time
Figure 11.4 shows the Interrupt Response Time. The interrupt response time is the period from when an interrupt request is generated until the first instruction in the interrupt routine is executed. The interrupt response time includes the period from when an interrupt request is generated until the currently executing instruction is completed (refer to (a) in Figure 11.4) and the period required for executing the interrupt sequence (20 cycles, refer to (b) in Figure 11.4).
Interrupt request generation
Interrupt request acknowledgement
Time
Instruction
(a)
Interrupt sequence
20 cycles (b)
Instruction in interrupt routine
Interrupt response time
(a) The period from when an interrupt request is generated until the currently executing instruction is completed. The length of time varies depending on the instruction being executed. The DIVX instruction requires the longest time, 30 cycles (no wait states if the divisor is a register). (b) 21 cycles for address match and single-step interrupts.
Figure 11.4
Interrupt Response Time
11.3.6
IPL Change when Interrupt Request is Acknowledged
When a maskable interrupt request is acknowledged, the interrupt priority level of the acknowledged interrupt is set in the IPL. When a software interrupt or special interrupt request is acknowledged, the level listed in Table 11.5 is set in the IPL. Table 11.5 lists the IPL Value When Software or Special Interrupt is Acknowledged. Table 11.5 IPL Value When Software or Special Interrupt is Acknowledged Value Set in IPL 7 Not changed
Interrupt Source without Interrupt Priority Level Watchdog timer, oscillation stop detection, voltage monitor 1/comparator A1, voltage monitor 2/comparator A2, address break Software, address match, single-step
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11. Interrupts
11.3.7
Saving Registers
In the interrupt sequence, the FLG register and PC are saved on the stack. After an extended 16 bits, 4 high-order bits in the PC and 4 high-order (IPL) and 8 low-order bits in the FLG register, are saved on the stack, the 16 low-order bits in the PC are saved. Figure 11.5 shows the Stack State Before and After Acknowledgement of Interrupt Request. The other necessary registers should be saved by a program at the beginning of the interrupt routine. The PUSHM instruction can save several registers in the register bank being currently used (1) with a single instruction. Note: 1. Selectable from registers R0, R1, R2, R3, A0, A1, SB, and FB.
Address
MSB
Stack
LSB
Address
MSB
Stack
LSB
m-4 m-3
m-4 m-3
PCL PCM FLGL FLGH PCH
[SP] New SP value (1)
m-2 m-1 m
m-2 m-1
Previous stack contents Previous stack contents
[SP] SP value before interrupt request acknowledgement (1)
m
Previous stack contents Previous stack contents
m+1
m+1
PCL PCM PCH FLGL FLGH
: 8 low-order bits of PC : 8 middle-order bits of PC : 4 high-order bits of PC : 8 low-order bits of FLG : 4 high-order bits of FLG
Stack state before interrupt request acknowledgement
Stack state after interrupt request acknowledgement
Note: 1.When an INT instruction for software numbers 32 to 63 has been executed, this SP is indicated by the U flag. Otherwise it is ISP.
Figure 11.5
Stack State Before and After Acknowledgement of Interrupt Request
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11. Interrupts
The register saving operation, which is performed as part of the interrupt sequence, saved in 8 bits at a time in four steps. Figure 11.6 shows the Register Saving Operation.
Address
Stack
Sequence in which registers are saved
[SP]-5 [SP]-4 [SP]-3
PCL PCM FLGL FLGH PCH
(3) (4)
Saved, 8 bits at a time
[SP]-2 [SP]-1 (1) (2)
[SP]
Completed saving registers in four operations
PCL PCM PCH FLGL FLGH
: 8 low-order bits of PC : 8 middle-order bits of PC : 4 high-order bits of PC : 8 low-order bits of FLG : 4 high-order bits of FLG
Note: 1.[SP] indicates the SP initial value when an interrupt request is acknowledged. After registers are saved, the SP content is [SP] minus 4. When an INT instruction for software numbers 32 to 63 has been executed, this SP is indicated by the U flag. Otherwise it is ISP.
Figure 11.6
Register Saving Operation
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11. Interrupts
11.3.8
Returning from Interrupt Routine
When the REIT instruction is executed at the end of an interrupt routine, the FLG register and PC, which have been saved on the stack, are automatically restored. The program, that was running before the interrupt request was acknowledged, starts running again. Registers saved by a program in an interrupt routine should be saved using the POPM instruction or a similar instruction before executing the REIT instruction.
11.3.9
Interrupt Priority
If two or more interrupt requests are generated while a single instruction is being executed, the interrupt with the higher priority is acknowledged. Set bits ILVL2 to ILVL0 to select any priority level for maskable interrupts (peripheral function). However, if two or more maskable interrupts have the same priority level, their interrupt priority is resolved by hardware, with the higher priority interrupts acknowledged. The priority of watchdog timer and other special interrupts is set by hardware. Figure 11.7 shows the Hardware Interrupt Priority. Software interrupts are not affected by the interrupt priority. If an instruction is executed, the MCU executes the interrupt routine.
Reset Address break Watchdog timer Oscillation stop detection Voltage monitor 1/comparator A1 Voltage monitor 2/comparator A2 Peripheral function Single step Address match
High
Low
Figure 11.7
Hardware Interrupt Priority
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11. Interrupts
11.3.10 Interrupt Priority Level Selection Circuit
The interrupt priority level selection circuit is used to select the highest priority interrupt. Figure 11.8 shows the Interrupt Priority Level Selection Circuit.
Priority level of interrupts
Level 0 (initial value)
Highest
Voltage monitor 1/comparator A1 UART2 bus collision detection Voltage monitor 2/comparator A2 INT3 Timer RB Timer RA INT0 INT1 Timer RC UART0 receive A/D conversion UART2 receive/ACK2 Timer RE UART0 transmit SSU / I2C bus (1) Key input UART2 transmit/NACK2 Flash memory ready IPL Lowest Interrupt request level selection output signal I flag Address match Watchdog timer Oscillation stop detection Voltage monitor 1/comparator A1 Voltage monitor 2/comparator A2 Interrupt request acknowledgement Peripheral function interrupt priority (if the priority levels are same)
Note: 1. Selectable by the IICSEL bit in the SSUIICSR register.
Figure 11.8
Interrupt Priority Level Selection Circuit
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11. Interrupts
11.4 11.4.1
INT Interrupt INTi Interrupt (i = 0, 1, 3)
The INTi interrupt is generated by an INTi input. To use the INTi interrupt, set the INTiEN bit in the INTEN register is to 1 (enabled). The edge polarity is selected using the INTiPL bit in the INTEN register and the POL bit in the INTiIC register. The input pins used as the INT1 input can be selected. Also, inputs can be passed through a digital filter with three different sampling clocks. The INT0 pin is shared with the pulse output forced cutoff input of timer RC, and the external trigger input of timer RB. Table 11.6 lists the Pin Configuration of INT Interrupt. Table 11.6 Pin Name INT0 P4_5 Pin Configuration of INT Interrupt Assigned Pin I/O Input Function INT0 interrupt input, timer RB external trigger input, timer RC pulse output forced cutoff input INT1 interrupt input INT3 interrupt input
INT1 INT3
P1_5 or P1_7 P3_3
Input Input
11.4.2
INT Interrupt Input Pin Select Register (INTSR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 INT1SEL0 0 b0 -- 0 R/W -- R/W R/W
Address 018Eh Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. INT1SEL0 INT1 pin select bit 0: P1_7 assigned 1: P1_5 assigned -- Reserved bits Set to 0. -- -- -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- Reserved bits Set to 0. --
-- R/W
The INTSR register selects which pin is assigned to the INT1 input. To use INT1, set this register. Set the INTSR register before setting the INT1 associated registers. Also, do not change the setting values in this register during INT1 operation.
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11. Interrupts
11.4.3
External Input Enable Register 0 (INTEN)
b6 INT3EN 0 b5 -- 0 b4 -- 0 b3 INT1PL 0 b2 INT1EN 0 b1 INT0PL 0 Function 0: Disabled 1: Enabled 0: One edge 1: Both edges 0: Disabled 1: Enabled 0: One edge 1: Both edges Set to 0. 0: Disabled 1: Enabled 0: One edge 1: Both edges b0 INT0EN 0 R/W R/W R/W R/W R/W R/W R/W R/W
Address 01FAh Bit b7 Symbol INT3PL After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name INT0EN INT0 input enable bit INT0PL INT0 input polarity select bit (1, 2) INT1EN INT1 input enable bit INT1PL INT1 input polarity select bit (1, 2) -- Reserved bits -- INT3EN INT3 input enable bit INT3PL INT3 input polarity select bit (1, 2)
Notes: 1. To set the INTiPL bit (i = 0, 1, 3) to 1 (both edges), set the POL bit in the INTiIC register to 0 (falling edge selected). 2. The IR bit in the INTiIC register may be set to 1 (interrupt requested) if the INTiPL bit is rewritten. Refer to 11.8.4 Changing Interrupt Sources.
11.4.4
INT Input Filter Select Register 0 (INTF)
b6 INT3F0 0 b5 -- 0 b4 -- 0 b3 INT1F1 0 b2 INT1F0 0 b1 INT0F1 0 Function
b1 b0
Address 01FCh Bit b7 Symbol INT3F1 After Reset 0 Bit b0 b1
b0 INT0F0 0 R/W R/W R/W
Symbol Bit Name INT0F0 INT0 input filter select bit INT0F1
0 0: No filter 0 1: Filter with f1 sampling 1 0: Filter with f8 sampling 1 1: Filter with f32 sampling
b3 b2
b2 b3
INT1F0 INT1 input filter select bit INT1F1
b4 b5 b6 b7
-- Reserved bits -- INT3F0 INT3 input filter select bit INT3F1
0 0: No filter 0 1: Filter with f1 sampling 1 0: Filter with f8 sampling 1 1: Filter with f32 sampling Set to 0.
b7 b6
R/W R/W
R/W R/W R/W
0 0: No filter 0 1: Filter with f1 sampling 1 0: Filter with f8 sampling 1 1: Filter with f32 sampling
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11. Interrupts
11.4.5
INTi Input Filter (i = 0, 1, 3)
The INTi input contains a digital filter. The sampling clock is selected using bits INTiF1 and INTiF0 in the INTF register. The INTi level is sampled every sampling clock cycle and if the sampled input level matches three times, the IR bit in the INTiIC register is set to 1 (interrupt requested). Figure 11.9 shows the INTi Input Filter Configuration. Figure 11.10 shows an Operating Example of INTi Input Filter.
INTiF1 to INTiF0
f1 f8 f32
= 01b
= 10b = 11b
Sampling clock
INTiEN
Other than INTiF1 to INTiF0 = 00b
INTi Port direction register (1)
Digital filter (input level matches 3 times)
INTi interrupt
INTiPL = 0
= 00b
Both edges detection INTiPL = 1 circuit
INTiF0, INTiF1: Bits in INTF register INTiEN, INTiPL: Bits in INTEN register i = 0, 1, 3
Note: 1. INT0: Port P4_5 direction register INT1: Port P1_5 direction register when P1_5 pin used Port P1_7 direction register when P1_7 pin used INT3: Port P3_3 direction register when P3_3 pin used
Figure 11.9
INTi Input Filter Configuration
INTi input
Sampling timing
IR bit in INTiIC register
Set to 0 by a program.
Note: This is an operating example when bits INTiF1 to INTiF0 in the INTiF register are set to 01b, 10b, or 11b (digital filter enabled). i = 0, 1, 3
Figure 11.10
Operating Example of INTi Input Filter
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11. Interrupts
11.5
Key Input Interrupt
A key input interrupt request is generated by one of the input edges of pins K10 to K13. The key input interrupt can be used as a key-on wake-up function to exit wait or stop mode. The KIiEN (i = 0 to 3) bit in the KIEN register is be used to select whether or not the pins are used as the KIi input. The KIiPL bit in the KIEN register is also be used to select the input polarity. When inputting "L" to the KIi pin, which sets the KIiPL bit to 0 (falling edge), the input to the other pins K10 to K13 is not detected as interrupts. When inputting "H" to the KIi pin, which sets the KIiPL bit to 1 (rising edge), the input to the other pins K10 to K13 is not also detected as interrupts. Figure 11.11 shows a Block Diagram of Key Input Interrupt. Table 11.7 lists the Pin Configuration of Key Input Interrupt.
PU02 bit in PUR0 register Pull-up transistor KUPIC register PD1_3 bit in PD1 register KI3EN bit PD1_3 bit KI3PL = 0 KI3 KI3PL = 1 Pull-up transistor KI2 KI2PL = 1 Pull-up transistor KI1 KI1PL = 1 Pull-up transistor KI0 KI0PL = 1 KI0EN bit PD1_0 bit KI0PL = 0 KI0EN, KI1EN, KI2EN, KI3EN, KI0PL, KI1PL, KI2PL, KI3PL: Bits in KIEN register PD1_0, PD1_1, PD1_2, PD1_3: Bits in PD1 register KI1EN bit PD1_1 bit KI1PL = 0 KI2EN bit PD1_2 bit KI2PL = 0 Interrupt control circuit Key input interrupt request
Figure 11.11
Block Diagram of Key Input Interrupt
Table 11.7 Pin Name KI0 KI1 KI2 KI3
Pin Configuration of Key Input Interrupt I/O Input Input Input Input Function KI0 interrupt input KI1 interrupt input KI2 interrupt input KI3 interrupt input
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11. Interrupts
11.5.1
Key Input Enable Register 0 (KIEN)
b6 KI3EN 0 b5 KI2PL 0 b4 KI2EN 0 b3 KI1PL 0 b2 KI1EN 0 b1 KI0PL 0 Function 0: Disabled 1: Enabled 0: Falling edge 1: Rising edge 0: Disabled 1: Enabled 0: Falling edge 1: Rising edge 0: Disabled 1: Enabled 0: Falling edge 1: Rising edge 0: Disabled 1: Enabled 0: Falling edge 1: Rising edge b0 KI0EN 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 01FEh Bit b7 Symbol KI3PL After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name KI0EN KI0 input enable bit KI0PL KI1EN KI1PL KI2EN KI2PL KI3EN KI3PL KI0 input polarity select bit KI1 input enable bit KI1 input polarity select bit KI2 input enable bit KI2 input polarity select bit KI3 input enable bit KI3 input polarity select bit
The IR bit in the KUPIC register may be set to 1 (interrupt requested) when the KIEN register is rewritten. Refer to 11.8.4 Changing Interrupt Sources.
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11. Interrupts
11.6
Address Match Interrupt
An address match interrupt request is generated immediately before execution of the instruction at the address indicated by the RMADi register (i = 0 or 1). This interrupt is used as a break function by the debugger. When the on-chip debugger is used, do not set an address match interrupt (registers AIER0, AIER1, RMAD0, and RMAD1, and fixed vector tables) in the user system. Set the starting address of any instruction in the RMADi register (i = 0 or 1). The AIERi bit in the AIERi register can be used to select enable or disable the interrupt. The address match interrupt is not affected by the I flag and IPL. The PC value (Refer to 11.3.7 Saving Registers) which is saved on the stack when an address match interrupt request is acknowledged varies depending on the instruction at the address indicated by the RMADi register. (The appropriate return address is not saved on the stack.) When returning from the address match interrupt, follow one of the following means: * Rewrite the contents of the stack and use the REIT instruction to return. * Use an instruction such as POP to restore the stack to its previous state before the interrupt request was acknowledged. Then use a jump instruction to return. Table 11.8 lists the PC Value Saved on Stack When Address Match Interrupt Request is Acknowledged and Table 11.9 lists the Correspondence Between Address Match Interrupt Sources and Associated Registers. Table 11.8 PC Value Saved on Stack When Address Match Interrupt Request is Acknowledged PC Value Saved (1) Address indicated by RMADi register + 2
Address Indicated by RMADi Register (i = 0 or 1) * Instruction with 2-byte operation code (2) * Instruction with 1-byte operation code (2) ADD.B:S #IMM8,dest SUB.B:S #IMM8,dest AND.B:S #IMM8,dest OR.B:S #IMM8,dest MOV.B:S #IMM8,dest STZ #IMM8,dest STNZ #IMM8,dest STZX #IMM81,#IMM82,dest CMP.B:S #IMM8,dest PUSHM src POPM dest JMPS #IMM8 JSRS #IMM8 MOV.B:S #IMM,dest (however, dest = A0 or A1) * Instructions other than above
Address indicated by RMADi register + 1
Notes: 1. Refer to the 11.3.7 Saving Registers. 2. Operation code: Refer to the R8C/Tiny Series Software Manual (REJ09B0001). Chapter 4. Instruction Code/Number of Cycles contains diagrams showing operation code below each syntax. Operation code is shown in the bold frame in the diagrams. Table 11.9 Correspondence Between Address Match Interrupt Sources and Associated Registers
Address Match Interrupt Source Address Match Interrupt Enable Bit Address Match Interrupt Register Address match interrupt 0 AIER0 RMAD0 Address match interrupt 1 AIER1 RMAD1
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11. Interrupts
11.6.1
Address Match Interrupt Enable Register i (AIERi) (i = 0 or 1)
b4 -- 0 -- 0 b3 -- 0 -- 0 b2 -- 0 -- 0 b1 -- 0 -- 0 b0 AIER0 0 AIER1 0
Address 01C3h (AIER0), 01C7h (AIER1) Bit b7 b6 b5 Symbol -- -- -- After Reset 0 0 0 Symbol After Reset Bit b0 b1 b2 b3 b4 b5 b6 b7 -- 0 -- 0 -- 0
AIER0 register
AIER1 register
Symbol Bit Name AIERi Address match interrupt i enable bit -- -- -- -- -- -- --
Function 0: Disabled 1: Enabled Nothing is assigned. If necessary, set to 0. When read, the content is 0.
R/W R/W --
11.6.2
Address Match Interrupt Register i (RMADi) (i = 0 or 1)
b2 -- X b10 -- X b18 -- X b1 -- X b9 -- X b17 -- X b0 -- X b8 -- X b16 -- X R/W R/W --
Address 01C2h to 01C0h (RMAD0), 01C6h to 01C4h (RMAD1) Bit b7 b6 b5 b4 b3 Symbol After Reset Bit Symbol After Reset Bit Symbol After Reset -- X b15 -- X b23 -- 0 -- X b14 -- X b22 -- 0 -- X b13 -- X b21 -- 0 -- X b12 -- X b20 -- 0 -- X b11 -- X b19 -- X
Bit Symbol Function Setting Range b19 to b0 -- Address setting register for address match interrupt 00000h to FFFFFh b20 -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. b21 -- b22 -- b23 --
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11. Interrupts
11.7
Timer RC Interrupt, Synchronous Serial Communication Unit Interrupt, I2C bus Interface Interrupt, and Flash Memory Interrupt (Interrupts with Multiple Interrupt Request Sources)
The timer RC interrupt, synchronous serial communication unit interrupt, I2C bus interface interrupt, and flash memory interrupt each have multiple interrupt request sources. An interrupt request is generated by the logical OR of several interrupt request sources and is reflected in the IR bit in the corresponding interrupt control register. Therefore, each of these peripheral functions has its own interrupt request source status register (status register) and interrupt request source enable register (enable register) to control the generation of interrupt requests (change of the IR bit in the interrupt control register). Table 11.10 lists the Registers Associated with Timer RC Interrupt, Synchronous Serial Communication Unit Interrupt, I2C bus Interface Interrupt, and Flash Memory Interrupt. Table 11.10 Registers Associated with Timer RC Interrupt, Synchronous Serial Communication Unit Interrupt, I2C bus Interface Interrupt, and Flash Memory Interrupt Status Register of Enable Register of Interrupt Control Interrupt Request Source Interrupt Request Source Register TRCSR TRCIER TRCIC SSSR SSER SSUIC ICSR RDYSTI BSYAEI ICIER RDYSTIE BSYAEIE CMDERIE IICIC FMRDYIC
Peripheral Function Name Timer RC Synchronous serial communication unit I2C bus interface Flash memory
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R8C/32A Group
11. Interrupts
As with other maskable interrupts, the timer RC interrupt, synchronous serial communication unit interrupt, I2C bus interface interrupt, and flash memory interrupt are controlled by the combination of the I flag, IR bit, bits ILVL0 to ILVL2, and IPL. However, since each interrupt source is generated by a combination of multiple interrupt request sources, the following differences from other maskable interrupts apply: * When bits in the enable register are set to 1 and the corresponding bits in the status register are set to 1 (interrupt enabled), the IR bit in the interrupt control register is set to 1 (interrupt requested). * When either bits in the status register or the corresponding bits in the enable register, or both are set to 0, the IR bit is set to 0 (no interrupt requested). That is, even if the interrupt is not acknowledged after the IR bit is set to 1, the interrupt request will not be retained. Also, the IR bit is not set to 0 even if 0 is written to this bit. * Individual bits in the status register are not automatically set to 0 even if the interrupt is acknowledged. The IR bit is also not automatically set to 0 when the interrupt is acknowledged. Set individual bits in the status register to 0 in the interrupt routine. Refer to the status register figure for how to set individual bits in the status register to 0. * When multiple bits in the enable register are set to 1 and other request sources are generated after the IR bit is set to 1, the IR bit remains 1. * When multiple bits in the enable register are set to 1, use the status register to determine which request source causes an interrupt. Refer to chapters of the individual peripheral functions (19. Timer RC, 24. Synchronous Serial Communication Unit (SSU), 25. I2C bus Interface, and 30. Flash Memory) for the status register and enable register. For the interrupt control register, refer to 11.3 Interrupt Control.
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R8C/32A Group
11. Interrupts
11.8 11.8.1
Notes on Interrupts Reading Address 00000h
Do not read address 00000h by a program. When a maskable interrupt request is acknowledged, the CPU reads interrupt information (interrupt number and interrupt request level) from 00000h in the interrupt sequence. At this time, the IR bit for the acknowledged interrupt is set to 0. If address 00000h is read by a program, the IR bit for the interrupt which has the highest priority among the enabled interrupts is set to 0. This may cause the interrupt to be canceled, or an unexpected interrupt to be generated.
11.8.2
SP Setting
Set a value in the SP before an interrupt is acknowledged. The SP is set to 0000h after a reset. If an interrupt is acknowledged before setting a value in the SP, the program may run out of control.
11.8.3
External Interrupt and Key Input Interrupt
Either the "L" level width or "H" level width shown in the Electrical Characteristics is required for the signal input to pins INT0, INT1, INT3 and pins KI0 to KI3, regardless of the CPU clock. For details, refer to Table 32.22 (VCC = 5V), Table 32.28 (VCC = 3V), Table 32.34 (VCC = 2.2V) External Interrupt INTi (i = 0, 1, 3) Input, Key Input Interrupt KIi (i = 0 to 3).
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11. Interrupts
11.8.4
Changing Interrupt Sources
The IR bit in the interrupt control register may be set to 1 (interrupt requested) when the interrupt source changes. To use an interrupt, set the IR bit to 0 (no interrupt requested) after changing interrupt sources. Changing interrupt sources as referred to here includes all factors that change the source, polarity, or timing of the interrupt assigned to a software interrupt number. Therefore, if a mode change of a peripheral function involves the source, polarity, or timing of an interrupt, set the IR bit to 0 (no interrupt requested) after making these changes. Refer to the descriptions of the individual peripheral functions for related interrupts. Figure 11.12 shows a Procedure Example for Changing Interrupt Sources.
Interrupt source change
Disable interrupts
(2, 3)
Change interrupt sources (including mode of peripheral function)
Set the IR bit to 0 (no interrupt request) using the MOV instruction (3)
Enable interrupts
(2, 3)
Change completed
IR bit: The interrupt control register bit for the interrupt whose source is to be changed Notes: 1. The above settings must be executed individually. Do not execute two or more settings simultaneously (using one instruction). 2. To prevent interrupt requests from being generated disable the peripheral function before changing the interrupt source. In this case, use the I flag if all maskable interrupts can be disabled. If all maskable interrupts cannot be disabled, use bits ILVL0 to ILVL2 for the interrupt whose source is to be changed. 3. Refer to 11.8.5 Rewriting Interrupt Control Register for the instructions to use and related notes.
Figure 11.12 Procedure Example for Changing Interrupt Sources
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11. Interrupts
11.8.5
Rewriting Interrupt Control Register
(a) The contents of the interrupt control register can be rewritten only while no interrupt requests corresponding to that register are generated. If an interrupt request may be generated, disable the interrupt before rewriting the contents of the interrupt control register. (b) When rewriting the contents of the interrupt control register after disabling the interrupt, be careful to choose appropriate instructions. Changing any bit other than the IR bit If an interrupt request corresponding to the register is generated while executing the instruction, the IR bit may not be set to 1 (interrupt requested), and the interrupt may be ignored. If this causes a problem, use one of the following instructions to rewrite the contents of the register: AND, OR, BCLR, and BSET. Changing the IR bit Depending on the instruction used, the IR bit may not be set to 0 (no interrupt requested). Use the MOV instruction to set the IR bit to 0. (c) When using the I flag to disable an interrupt, set the I flag as shown in the sample programs below. Refer to (b) regarding rewriting the contents of interrupt control registers using the sample programs. Examples 1 to 3 shows how to prevent the I flag from being set to 1 (interrupts enabled) before the contents of the interrupt control register are rewritten for the effects of the internal bus and the instruction queue buffer. Example 1: Use the NOP instructions to pause program until the interrupt control register is rewritten INT_SWITCH1: FCLR I ; Disable interrupts AND.B #00H,0056H ; Set the TRAIC register to 00h NOP ; NOP FSET I ; Enable interrupts Example 2: Use a dummy read to delay the FSET instruction INT_SWITCH2: FCLR I ; Disable interrupts AND.B #00H,0056H ; Set the TRAIC register to 00h MOV.W MEM,R0 ; Dummy read FSET I ; Enable interrupts Example 3: Use the POPC instruction to change the I flag INT_SWITCH3: PUSHC FLG FCLR I ; Disable interrupts AND.B #00H,0056H ; Set the TRAIC register to 00h POPC FLG ; Enable interrupts
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12. ID Code Areas
12. ID Code Areas
The ID code areas are used to implement a function that prevents the flash memory from being rewritten in standard serial I/O mode. This function prevents the flash memory from being read, rewritten, or erased.
12.1
Overview
The ID code areas are assigned to 0FFDFh, 0FFE3h, 0FFEBh, 0FFEFh, 0FFF3h, 0FFF7h, and 0FFFBh of the respective vector highest-order addresses of the fixed vector table. Figure 12.1 shows the ID Code Areas.
ID code areas
Address 0FFDFh to 0FFDCh 0FFE3h to 0FFE0h 0FFE7h to 0FFE4h 0FFEBh to 0FFE8h 0FFEFh to 0FFECh 0FFF3h to 0FFF0h 0FFF7h to 0FFF4h 0FFFBh to 0FFF8h 0FFFFh to 0FFFCh ID3 ID4 ID5 ID6 ID7 OFS ID1 ID2
Undefined instruction vector Overflow vector BRK instruction vector Address match vector Single step vector
Watchdog timer, oscillation stop detection, voltage monitor 1, voltage monitor 2
Address break vector (Reserved) Reset vector 4 bytes
Figure 12.1
ID Code Areas
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12. ID Code Areas
12.2
Functions
The ID code areas are used in standard serial I/O mode. Unless 3 bytes (addresses 0FFFCh to 0FFFEh) of the reset vector are set to FFFFFFh, the ID codes stored in the ID code areas and the ID codes sent from the serial programmer or the on-chip debugging emulator are checked to see if they match. If the ID codes match, the commands sent from the serial programmer or the on-chip debugging emulator are acknowledged. If the ID codes do not match, the commands are not acknowledged. To use the serial programmer or the on-chip debugging emulator, first write predetermined ID codes to the ID code areas. If 3 bytes (addresses 0FFFCh to 0FFFEh) of the reset vector are set to FFFFFFh, the ID codes are not checked and all commands are accepted. As the ID code areas are allocated in the flash memory (not in the SFRs), they cannot be rewritten by executing an instruction. Write appropriate values when creating a program. The character sequence of the ASCII codes "ALeRASE" is the reserved word used for the forced erase function. The character sequence of the ASCII codes "Protect" is the reserved word used for the standard serial I/O mode disabled function. Table 12.1 shows the ID Code Reserved Word. The reserved word is a set of reserved characters when all the addresses and data in the ID code storage addresses sequentially match Table 12.1. When the forced erase function or standard serial I/O mode disabled function is not used, use another character sequence of the ASCII codes. Table 12.1 ID Code Reserved Word lD Code Reserved Word (ASCII) (1) ALeRASE Protect 41h (upper-case "A") 50h (upper-case "P") 4Ch (upper-case "L") 72h (lower-case "r") 65h (lower-case "e") 6Fh (lower-case "o") 52h (upper-case "R") 74h (lower-case "t") 41h (upper-case "A") 65h (lower-case "e") 53h (upper-case "S") 63h (lower-case "c") 45h (upper-case "E") 74h (lower-case "t")
ID Code Storage Address 0FFDFh 0FFE3h 0FFEBh 0FFEFh 0FFF3h 0FFF7h 0FFFBh ID1 ID2 ID3 ID4 ID5 ID6 ID7
Note: 1. Reserve word:A set of characters when all the addresses and data in the ID code storage addresses sequentially match Table 12.1.
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12. ID Code Areas
12.3
Forced Erase Function
This function is used in standard serial I/O mode. When the ID codes sent from the serial programmer or the onchip debugging emulator are "ALeRASE" in ASCII code, the content of the user ROM area will be erased at once. However, if the contents of the ID code addresses are set to other than "ALeRASE" (other than Table 12.1 ID Code Reserved Word) when the ROMCR bit in the OFS register is set to 1 and the ROMCP1 bit is set to 0 (ROM code protect enabled), forced erasure is not executed and the ID codes are checked with the ID code check function. Table 12.2 lists the Conditions and Operations of Forced Erase Function. Also, when the contents of the ID code addresses are set to "ALeRASE" in ASCII code, if the ID codes sent from the serial programmer or the on-chip debugging emulator are "ALeRASE", the content of the user ROM area will be erased. If the ID codes sent from the serial programmer are other than "ALeRASE", the ID codes do not match and no command is acknowledged, thus the user ROM area remains protected. Table 12.2 Conditions and Operations of Forced Erase Function Condition ID code from serial programmer or the on-chip debugging emulator ALeRASE ID code in ID code storage address ALeRASE Other than ALeRASE (1) Bits ROMCP1 and ROMCR in OFS register - Other than 01b (ROM code protect disabled) 01b (ROM code protect enabled) - Operation
All erasure of user ROM area (forced erase function) ID code check (ID code check function) ID code check (ID code check function. No ID code match.) ID code check (ID code check function)
Other than ALeRASE ALeRASE
Other than ALeRASE (1) -
Note: 1. For "Protect", refer to 12.4 Standard Serial II/O Mode Disabled Function.
12.4
Standard Serial II/O Mode Disabled Function
This function is used in standard serial I/O mode. When the I/D codes in the ID code storage addresses are set to the reserved character sequence of the ASCII codes "Protect" (refer to Table 12.1 ID Code Reserved Word), communication with the serial programmer or the on-chip debugging emulator is not performed. This does not allow the flash memory to be read, rewritten, or erased using the serial programmer or the on-chip debugging emulator. Also, if the ID codes are also set to the reserved character sequence of the ASCII codes "Protect" when the ROMCR bit in the OFS register is set to 1 and the ROMCP1 bit is set to 0 (ROM code protect enabled), ROM code protection cannot be disabled using the serial programmer or the on-chip debugging emulator. This prevents the flash memory from being read, rewritten, or erased using the serial programmer, the on-chip debugging emulator, or parallel programmer.
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12. ID Code Areas
12.5 12.5.1
Notes on ID Code Areas Setting Example of ID Code Areas
As the ID code areas are allocated in the flash memory (not in the SFRs), they cannot be rewritten by executing an instruction. Write appropriate values when creating a program. The following shows a setting example.
* To set 55h in all of the ID code areas
.org 00FFDCH .lword dummy | (55000000h) ; UND .lword dummy | (55000000h) ; INTO .lword dummy ; BREAK .lword dummy | (55000000h) ; ADDRESS MATCH .lword dummy | (55000000h) ; SET SINGLE STEP .lword dummy | (55000000h) ; WDT .lword dummy | (55000000h) ; ADDRESS BREAK .lword dummy | (55000000h) ; RESERVE (Programming formats vary depending on the compiler. Check the compiler manual.)
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13. Option Function Select Area
13. Option Function Select Area
13.1 Overview
The option function select area is used to select the MCU state after a reset, the function to prevent rewriting in parallel I/O mode, or the watchdog timer operation. The reset vector highest-order-address, 0FFFFh and 0FFDBh, are assigned as the option function select area. Figure 13.1 shows the Option Function Select Area.
Option function select area
Address
0FFDBh to 0FFD8h
OFS2
Reserved area
0FFFFh to 0FFFCh
OFS
Reset vector 4 bytes
Figure 13.1
Option Function Select Area
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13. Option Function Select Area
13.2
Registers
Registers OFS and OFS2 are used to select the MCU state after a reset, the function to prevent rewriting in parallel I/O mode, or the watchdog timer operation.
13.2.1
Option Function Select Register (OFS)
b6 LVDAS 1 b5 b4 b3 b2 VDSEL1 VDSEL0 ROMCP1 ROMCR 1 1 1 1 b1 -- 1 b0 WDTON 1 (Note 1) R/W R/W R/W R/W R/W R/W R/W
Address 0FFFFh Bit b7 Symbol CSPROINI When shipping 1 Bit b0 b1 b2 b3 b4 b5
Symbol Bit Name WDTON Watchdog timer start select bit -- Reserved bit ROMCR ROM code protect disable bit ROMCP1 ROM code protect bit VDSEL0 Voltage detection 0 level select bit (2) VDSEL1
Function 0: Watchdog timer automatically starts after reset. 1: Watchdog timer is stopped after reset. Set to 1. 0: ROM code protect disabled 1: ROMCP1 bit enabled 0: ROM code protect enabled 1: ROM code protect disabled
b5 b4
b6 b7
LVDAS
Voltage detection 0 circuit start bit (3)
CSPROINI Count source protection mode after reset select bit
0 0: 3.80 V selected (Vdet0_3) 0 1: 2.85 V selected (Vdet0_2) 1 0: 2.35 V selected (Vdet0_1) 1 1: 1.90 V selected (Vdet0_0) 0: Voltage monitor 0 reset enabled after reset 1: Voltage monitor 0 reset disabled after reset 0: Count source protect mode enabled after reset 1: Count source protect mode disabled after reset
R/W R/W
Notes: 1. If the block including the OFS register is erased, the OFS register value is set to FFh. 2. The same level of the voltage detection 0 level selected by bits VDSEL0 and VDESL1 is set in both functions of voltage monitor 0 reset and power-on reset. 3. To use power-on reset, set the LVDAS bit to 0 (voltage monitor 0 reset enabled after reset).
The OFS register is allocated in the flash memory. Write to this register with a program. After writing, do not write additions to this register.
LVDAS Bit (Voltage Detection 0 Circuit Start Bit)
The Vdet0 voltage to be monitored by the voltage detection 0 circuit is selected by bits VDSEL0 and VDSEL1.
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13. Option Function Select Area
13.2.2
Option Function Select Register 2 (OFS2)
b6 -- 1 b5 -- 1 b4 -- 1 b3 b2 b1 b0 WDTRCS1 WDTRCS0 WDTUFS1 WDTUFS0 1 1 1 1 (Note 1) Function
b1 b0
Address 0FFDBh Bit b7 Symbol -- When shipping 1 Bit b0 b1
Symbol Bit Name WDTUFS0 Watchdog timer underflow period set bit WDTUFS1
0 0: 03FFh 0 1: 0FFFh 1 0: 1FFFh 1 1: 3FFFh
b3 b2
R/W R/W R/W
b2 b3
WDTRCS0 Watchdog timer refresh acknowledgement period WDTRCS1 set bit
b4 b5 b6 b7
-- -- -- --
Reserved bits
0 0: 25% 0 1: 50% 1 0: 75% 1 1: 100% Set to 1.
R/W R/W
R/W
Note: 1. If the block including the OFS2 register is erased, the OFS2 register value is set to FFh.
The OFS2 register is located on the flash memory. Write to this register with a program. After writing, do not write additions to this register.
Bits WDTRCS0 and WDTRCS1 (Watchdog Timer Refresh Acknowledgement Period Set Bit)
Assuming that the period from when the watchdog timer starts counting until it underflows is 100%, the refresh acknowledgement period for the watchdog timer can be selected. For details, refer to 14.3.1.1 Refresh Acknowledgment Period.
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13. Option Function Select Area
13.3 13.3.1
Notes on Option Function Select Area Setting Example of Option Function Select Area
As the option function select area is allocated in the flash memory (not in the SFRs), they cannot be rewritten by executing an instruction. Write appropriate values when creating a program. The following shows a setting example.
* To set FFh in the OFS register
.org 00FFFCH .lword reset | (0FF000000h) ; RESET (Programming formats vary depending on the compiler. Check the compiler manual.)
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14. Watchdog Timer
14. Watchdog Timer
The watchdog timer is a function that detects when a program is out of control. Use of the watchdog timer is recommended to improve the reliability of the system.
14.1
Overview
The watchdog timer contains a 15-bit counter and allows selection of count source protection mode enable or disable. Table 14.1 lists the Watchdog Timer Specifications. Refer to 5.5 Watchdog Timer Reset for details of the watchdog timer reset. Figure 14.1 shows a Watchdog Timer Block Diagram. Table 14.1 Watchdog Timer Specifications Item Count source Count operation Count start condition Count Source Protection Mode Disabled CPU clock Count Source Protection Mode Enabled Low-speed on-chip oscillator clock for the watchdog timer
Count stop condition Watchdog timer initialization conditions
Operations at underflow Selectable functions
Decrement Either of the following can be selected: * After a reset, count starts automatically. * Count starts by writing to the WDTS register. Stop mode, wait mode None * Reset * Write 00h and then FFh to the WDTR register (with acknowledgement period setting). * Underflow Watchdog timer reset Watchdog timer interrupt or watchdog timer reset * Division ratio of the prescaler Selected by the WDTC7 bit in the WDTC register or the CM07 bit in the CM0 register. * Count source protection mode Whether count source protection mode is enabled or disabled after a reset can be selected by the CSPROINI bit in the OFS register (flash memory). If count source protection mode is disabled after a reset, it can be enabled or disabled by the CSPRO bit in the CSPR register (program). * Start or stop of the watchdog timer after a reset Selected by the WDTON bit in the OFS register (flash memory). * Initial value of the watchdog timer Selectable by bits WDTUFS0 and WDTUFS1 in the OFS2 register. * Refresh acknowledgement period for the watchdog timer Selectable by bits WDTRCS0 and WDTRCS1 in the OFS2 register.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
14. Watchdog Timer
Prescaler
1/16 CPU clock 1/128 1/2
CM07 = 0, WDTC7 = 0 CSPRO = 0 CM07 = 0, WDTC7 = 1 CM07 = 1 CSPRO = 1 PM12 = 0 Watchdog timer interrupt request
Watchdog timer
(Note 1) PM12 = 1 Watchdog timer reset
Low-speed on-chip oscillator for watchdog timer Oscillation starts when CSPRO = 1 Internal reset signal (Low active)
Bits WDTRCS0 and WDTRCS1 Write to WDTR register
Refresh period control circuit
CSPRO: Bit in CSPR register WDTC7: Bit in WDTC register PM12: Bit in PM1 register CM07: Bit in CM0 register WDTUFS0, WDTUFS1, WDTRCS0, WDTRCS1: Bits in OFS2 register
Note: 1. A value set by bits WDTUFS0 and WDTUFS1 is set in the watchdog timer (value when shipping: 3FFFh).
Figure 14.1
Watchdog Timer Block Diagram
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
14. Watchdog Timer
14.2 14.2.1
Registers Processor Mode Register 1 (PM1)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 PM12 0 b1 -- 0 Function Set to 0. b0 -- 0 R/W R/W R/W --
Address 0005h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name -- Reserved bits -- PM12 WDT interrupt/reset switch bit -- -- -- -- --
0: Watchdog timer interrupt 1: Watchdog timer reset (1) Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Reserved bit
Set to 0.
R/W
Note: 1. The PM12 bit is set to 1 when 1 is written by a program (and remains unchanged even if 0 is written to it). This bit is automatically set to 1 when the CSPRO bit in the CSPR register is set to 1 (count source protection mode enabled).
Set the PRC1 bit in the PRCR register to 1 (write enabled) before rewriting the PM1 register.
14.2.2
Watchdog Timer Reset Register (WDTR)
b6 -- X b5 -- X b4 -- X b3 -- X b2 -- X b1 -- X b0 -- X R/W W
Address 000Dh Bit b7 Symbol -- After Reset X
Bit Function b7 to b0 Writing 00h and then FFh to this register initializes the watchdog timer. The initial value of the watchdog timer is specified by bits WDTUFS0 and WDTUF1 in the OFS2 register.
14.2.3
Watchdog Timer Start Register (WDTS)
b6 -- X b5 -- X b4 -- X b3 -- X b2 -- X b1 -- X b0 -- X R/W W
Address 000Eh Bit b7 Symbol -- After Reset X
Bit Function b7 to b0 A write instruction to this register starts the watchdog timer.
REJ09B0458-0010 Rev.0.10 Page 158 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
14. Watchdog Timer
14.2.4
Watchdog Timer Control Register (WDTC)
b6 -- 0 b5 -- 1 b4 -- 1 b3 -- 1 b2 -- 1 b1 -- 1 b0 -- 1 R/W R
Address 000Fh Bit b7 Symbol WDTC7 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol -- -- -- -- -- -- -- WDTC7
Bit Name Function When read, b6 to b10 of the watchdog timer can be read.
When read, b11 of the watchdog timer can be read. Reserved bit When read, the content is 0. Prescaler select bit 0: Divided-by-16 1: Divided-by-128
R R R/W
14.2.5
Count Source Protection Mode Register (CSPR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 -- 0
Address 001Ch Bit b7 Symbol CSPRO After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
(Note 1) R/W R/W
Symbol Bit Name Function -- Reserved bits Set to 0. -- -- -- -- -- -- CSPRO Count source protection mode select bit (2) 0: Count source protection mode disabled 1: Count source protection mode enabled
R/W
Notes: 1. When 0 is written to the CSPROINI bit in the OFS register, the value after reset is 10000000b. 2. To set the CSPRO bit to 1, write 0 and then 1 to it. This bit cannot be set to 0 by a program.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
14. Watchdog Timer
14.2.6
Option Function Select Register (OFS)
b6 LVDAS 1 b5 b4 b3 b2 VDSEL1 VDSEL0 ROMCP1 ROMCR 1 1 1 1 b1 -- 1 b0 WDTON 1 (Note 1) R/W R/W R/W R/W R/W R/W R/W
Address 0FFFFh Bit b7 Symbol CSPROINI When shipping 1 Bit b0 b1 b2 b3 b4 b5
Symbol Bit Name WDTON Watchdog timer start select bit -- Reserved bit ROMCR ROM code protect disable bit ROMCP1 ROM code protect bit VDSEL0 Voltage detection 0 level select bit (2) VDSEL1
Function 0: Watchdog timer automatically starts after reset. 1: Watchdog timer is stopped after reset. Set to 1. 0: ROM code protect disabled 1: ROMCP1 bit enabled 0: ROM code protect enabled 1: ROM code protect disabled
b5 b4
b6 b7
LVDAS
Voltage detection 0 circuit start bit (3)
CSPROINI Count source protection mode after reset select bit
0 0: 3.80 V selected (Vdet0_3) 0 1: 2.85 V selected (Vdet0_2) 1 0: 2.35 V selected (Vdet0_1) 1 1: 1.90 V selected (Vdet0_0) 0: Voltage monitor 0 reset enabled after reset 1: Voltage monitor 0 reset disabled after reset 0: Count source protect mode enabled after reset 1: Count source protect mode disabled after reset
R/W R/W
Notes: 1. If the block including the OFS register is erased, the OFS register value is set to FFh. 2. The same level of the voltage detection 0 level selected by bits VDSEL0 and VDESL1 is set in both functions of voltage monitor 0 reset and power-on reset. 3. To use power-on reset, set the LVDAS bit to 0 (voltage monitor 0 reset enabled after reset).
The OFS register is allocated in the flash memory. Write to this register with a program. After writing, do not write additions to this register.
LVDAS Bit (Voltage Detection 0 Circuit Start Bit)
The Vdet0 voltage to be monitored by the voltage detection 0 circuit is selected by bits VDSEL0 and VDSEL1.
REJ09B0458-0010 Rev.0.10 Page 160 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
14. Watchdog Timer
14.2.7
Option Function Select Register 2 (OFS2)
b6 -- 1 b5 -- 1 b4 -- 1 b3 b2 b1 b0 WDTRCS1 WDTRCS0 WDTUFS1 WDTUFS0 1 1 1 1 (Note 1) Function
b1 b0
Address 0FFDBh Bit b7 Symbol -- When shipping 1 Bit b0 b1
Symbol Bit Name WDTUFS0 Watchdog timer underflow period set bit WDTUFS1
0 0: 03FFh 0 1: 0FFFh 1 0: 1FFFh 1 1: 3FFFh
b3 b2
R/W R/W R/W
b2 b3
WDTRCS0 Watchdog timer refresh acknowledgement period WDTRCS1 set bit
b4 b5 b6 b7
-- -- -- --
Reserved bits
0 0: 25% 0 1: 50% 1 0: 75% 1 1: 100% Set to 1.
R/W R/W
R/W
Note: 1. If the block including the OFS2 register is erased, the OFS2 register value is set to FFh.
The OFS2 register is located on the flash memory. Write to this register with a program. After writing, do not write additions to this register.
Bits WDTRCS0 and WDTRCS1 (Watchdog Timer Refresh Acknowledgement Period Set Bit)
Assuming that the period from when the watchdog timer starts counting until it underflows is 100%, the refresh acknowledgement period for the watchdog timer can be selected. For details, refer to 14.3.1.1 Refresh Acknowledgment Period.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
14. Watchdog Timer
14.3 14.3.1
Functional Description Common Items for Multiple Modes Refresh Acknowledgment Period
14.3.1.1
The period for acknowledging refreshment operation to the watchdog timer (write to the WDTR register) can be selected by bits WDTRCS0 and WDTRCS1 in the OFS2 register. Figure 14.2 shows the Refresh Acknowledgement Period for Watchdog Timer. Assuming that the period from when the watchdog timer starts counting until it underflows is 100%, a refresh operation executed during the refresh acknowledgement period is acknowledged. Any refresh operation executed during the period other than the above is processed as an incorrect write, and a watchdog timer interrupt or watchdog timer reset (selectable by the PM12 bit in the PM1 register) is generated.
Watchdog timer period Count starts Refresh can be acknowledged Processed as incorrect write (1) Underflow Refresh acknowledge period 100% (WDTRCS1 to WDTRCS0 = 11b)
Refresh can be acknowledged
75% (WDTRCS1 to WDTRCS0 = 10b)
Processed as incorrect write (1) Refresh can be acknowledged Refresh can be acknowledged
50% (WDTRCS1 to WDTRCS0 = 01b)
Processed as incorrect write (1)
25% (WDTRCS1 to WDTRCS0 = 00b)
0%
25%
50%
75%
100%
WDTRCS0, WDTRCS1: Bits in OFS2 register
Note: 1. A watchdog timer interrupt or watchdog timer reset is generated.
Figure 14.2
Refresh Acknowledgement Period for Watchdog Timer
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
14. Watchdog Timer
14.3.2
Count Source Protection Mode Disabled
The count source for the watchdog timer is the CPU clock when count source protection mode is disabled. Table 14.2 lists the Watchdog Timer Specifications (Count Source Protection Mode Disabled). Table 14.2 Watchdog Timer Specifications (Count Source Protection Mode Disabled) Specification CPU clock Decrement Division ratio of prescaler (n) x count value of watchdog timer (m) (1) CPU clock n: 16 or 128 (selected by the WDTC7 bit in the WDTC register), or 2 when selecting the low-speed clock (CM07 bit in CM0 register = 1) m: Value set by bits WDTUFS0 and WDTUFS1 in the OFS2 register Example: The period is approximately 13.1 ms when: - The CPU clock frequency is set to 20 MHz. - The prescaler is divided by 16. - Bits WDTUFS1 to WDTUFS0 are set to 11b (3FFFh). * Reset * Write 00h and then FFh to the WDTR register. * Underflow The operation of the watchdog timer after a reset is selected by the WDTON bit (2) in the OFS register (address 0FFFFh). * When the WDTON bit is set to 1 (watchdog timer is stopped after reset). The watchdog timer and prescaler are stopped after a reset and start counting when the WDTS register is written to. * When the WDTON bit is set to 0 (watchdog timer starts automatically after reset). The watchdog timer and prescaler start counting automatically after a reset. Stop mode, wait mode (Count resumes from the retained value after exiting.) * When the PM12 bit in the PM1 register is set to 0. Watchdog timer interrupt * When the PM12 bit in the PM1 register is set to 1. Watchdog timer reset (refer to 5.5 Watchdog Timer Reset)
Item Count source Count operation Period
Watchdog timer initialization conditions Count start conditions
Count stop condition Operations at underflow
Notes: 1. The watchdog timer is initialized when 00h and then FFh is written to the WDTR register. The prescaler is initialized after a reset. This may cause some errors due to the prescaler during the watchdog timer period. 2. The WDTON bit cannot be changed by a program. To set this bit, write 0 to bit 0 of address 0FFFFh with a flash programmer.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
14. Watchdog Timer
14.3.3
Count Source Protection Mode Enabled
The count source for the watchdog timer is the low-speed on-chip oscillator clock for the watchdog timer when count source protection mode is enabled. If the CPU clock stops when a program is out of control, the clock can still be supplied to the watchdog timer. Table 14.3 lists the Watchdog Timer Specifications (Count Source Protection Mode Enabled). Table 14.3 Watchdog Timer Specifications (Count Source Protection Mode Enabled) Specification Low-speed on-chip oscillator clock Decrement Count value of watchdog timer (m) Low-speed on-chip oscillator clock for the watchdog timer m: Value set by bits WDTUFS0 and WDTUFS1 in the OFS2 register Example: The period is approximately 8.2 ms when: - The on-chip oscillator clock for the watchdog timer is set to 125 kHz. - Bits WDTUFS1 to WDTUFS0 are set to 00b (03FFh). * Reset * Write 00h and then FFh to the WDTR register. * Underflow The operation of the watchdog timer after a reset is selected by the WDTON bit (1) in the OFS register (address 0FFFFh). * When the WDTON bit is set to 1 (watchdog timer is stopped after reset). The watchdog timer and prescaler are stopped after a reset and start counting when the WDTS register is written to. * When the WDTON bit is set to 0 (watchdog timer starts automatically after reset). The watchdog timer and prescaler start counting automatically after a reset. None (Count does not stop even in wait mode once it starts. The MCU does not enter stop mode.) Watchdog timer reset (Refer to 5.5 Watchdog Timer Reset.) * When the CSPPRO bit in the CSPR register is set to 1 (count source protection mode enabled) (2), the following are set automatically: - The low-speed on-chip oscillator for the watchdog timer is on. - The PM12 bit in the PM1 register is set to 1 (watchdog timer reset when the watchdog timer underflows).
Item Count source Count operation Period
Watchdog timer initialization conditions Count start conditions
Count stop condition Operation at underflow Registers, bits
Notes: 1. The WDTON bit cannot be changed by a program. To set this bit, write 0 to bit 0 of address 0FFFFh with a flash programmer. 2. Even if 0 is written to the CSPROINI bit in the OFS register, the CSPRO bit is set to 1. The CSPROINI bit cannot be changed by a program. To set this bit, write 0 to bit 7 of address 0FFFFh with a flash programmer.
REJ09B0458-0010 Rev.0.10 Page 164 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
15. DTC
15. DTC
The DTC (data transfer controller) is a function that transfers data between the SFR and on-chip memory without using the CPU. This chip incorporates one DTC channel. The DTC is activated by a peripheral function interrupt to perform data transfers. The DTC and CPU use the same bus, and the DTC takes priority over the CPU in using the bus. To control DTC data transfers, control data comprised of a transfer source address, a transfer destination address, and operating modes are allocated in the DTC control data area. Each time the DTC is activated, the DTC reads control data to perform data transfers.
15.1
Overview
Table 15.1 shows the DTC Specifications. Table 15.1 DTC Specifications
Specification 21 sources 24 sets 64 Kbytes (00000h to 0FFFFh) 256 times 255 times 256 bytes 255 bytes Byte Transfers end on completion of the transfer causing the DTCCT register value to change from 1 to 0. On completion of the transfer causing the DTCCT register value to change from 1 to 0, the repeat area address is initialized and the DTRLD register value is reloaded to the DTCCT register to continue transfers. Fixed or incremented Addresses of the area not selected as the repeat area are fixed or incremented. See Table 15.6 DTC Activation Sources and DTC Vector Addresses. On completion of the data transfer causing the DTCCT register value to change from 1 to 0, the activation source interrupt request is generated for the CPU. When the RPTINT bit in the DTCCR register is 1 (interrupt generation enabled), the activation source interrupt request is generated for the CPU on completion of the data transfer causing the DTCCT register value to change from 1 to 0. When bits DTCENi0 to DTCENi1 and bits DTCENi3 to DTCENi7 in the DTCENi registers are 1 (activation enabled), data transfer is started each time the corresponding DTC activation sources are generated. * When bits DTCENi0 to DTCENi1 and bits DTCENi3 to DTCENi7 are set to 0 (activation disabled). * When the data transfer causing the DTCCT register value to change from 1 to 0 is completed. * When bits DTCENi0 to DTCENi1 and bits DTCENi3 to DTCENi7 are set to 0 (activation disabled). * When the data transfer causing the DTCCT register value to change from 1 to 0 is completed while the RPTINT bit is 1 (interrupt generation enabled).
Item Activation sources Allocatable control data Address space which can be transferred Maximum number of transfer Normal mode times Repeat mode Maximum size of block to be Normal mode transferred Repeat mode Unit of transfers Transfer mode Normal mode Repeat mode
Address control
Normal mode Repeat mode
Priority of activation sources Interrupt request Normal mode
Repeat mode
Transfer start
Transfer stop
Normal mode
Repeat mode
i = 0 to 3, 5, 6
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
15. DTC
CPU
Peripheral interrupt request
DTBLS
DTCCT
DTRLD
DTSAR
DTCTL
Interrupt controller
Bus interface
Peripheral bus
Figure 15.1
DTC Block Diagram
15.2
Registers
Table 15.2 shows the Register Configuration and Table 15.3 shows the Correspondences between Bits DTCENi0 to DTCENi1, Bits DTCENi3 to DTCENi7 (i = 0 to 3, 5, 6) and Interrupt Sources. Table 15.2 Register Configuration
Symbol DTCCR DTBLS DTCCT DTRLD DTSAR DTDAR DTCTL DTCEN0 DTCEN1 DTCEN2 DTCEN3 DTCEN5 DTCEN6 R/W -- -- --
(1)
Register Name DTC control register DTC block size register DTC transfer count register DTC transfer count reload register DTC source address register DTC destination address register DTC activation control register DTC activation enable register 0 DTC activation enable register 1 DTC activation enable register 2 DTC activation enable register 3 DTC activation enable register 5 DTC activation enable register 6
After Reset 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h
Peripheral functions
Peripheral interrupt request
DTDAR
ROM
RAM
Internal bus
DTCENi (i = 0 to 3, 5, 6)
DTC activation request
Control circuit
DTCCR
DTCCR: DTC control register DTBLS: DTC block size register DTCCT: DTC transfer count register DTRLD: DTC transfer count reload register DTSAR: DTC source address register DTDAR: DTC destination address register DTCTL: DTC activation control register DTCEN0 to DTCEN6: DTC activation enable registers 0 to 6
Address -- (2) -- (2) -- (2) -- (2) -- (2) -- (2) 0080h 0088h 0089h 008Ah 008Bh 008Dh 008Eh
-- (1)
(1)
-- (1)
(1)
-- (1) R/W R/W R/W R/W R/W R/W R/W
Notes: 1. The registers in the DTC cannot be directly read or written to. 2. Allocated as control data at addresses from 2C40h to 2CFFh in the DTC control data area.
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R8C/32A Group
15. DTC
15.2.1
DTC Control Register (DTCCR)
b0 MODE 0 R/W -- -- -- -- -- -- R/W
Address See Table 15.5 Control Data Allocation Addresses. Bit b7 b6 b5 b4 b3 b2 b1 Symbol -- -- RPTINT CHNE DAMOD SAMOD RPTSEL After Reset 0 0 0 0 0 0 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol MODE Bit Name Transfer mode select bit
RPTSEL Repeat area select bit (1) SAMOD Source address control bit (2) DAMOD Destination address control bit (2) CHNE Chain transfer enable bit
RPTINT Repeat mode interrupt enable bit (1) -- -- Reserved bits
Function 0: Normal mode 1: Repeat mode 0: Transfer destination is the repeat area. 1: Transfer source is the repeat area. 0: Fixed 1: Incremented 0: Fixed 1: Incremented 0: Chain transfers disabled 1: Chain transfers enabled 0: Interrupt generation disabled 1: Interrupt generation enabled Set to 0.
Notes: 1. This bit is valid when the MODE bit is 1 (repeat mode). 2. Settings of bits SAMOD and DAMOD are invalid for the repeat area.
15.2.2
DTC Block Size Register (DTBLS)
b2 -- 0 b1 -- 0 b0 -- 0 Setting Range 00h to FFh (1) R/W --
Address See Table 15.5 Control Data Allocation Addresses. Bit b7 b6 b5 b4 b3 Symbol After Reset Bit b7 to b0 -- 0 -- 0 -- 0 -- 0 -- 0
Function These bits specify the size of the data block to be transferred by one activation.
Note: 1. When the DTBLS register is set to 00h, the block size is 256 bytes.
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R8C/32A Group
15. DTC
15.2.3
DTC Transfer Count Register (DTCCT)
b2 -- 0 b1 -- 0 b0 -- 0 Setting Range 00h to FFh (1) R/W --
Address See Table 15.5 Control Data Allocation Addresses. Bit b7 b6 b5 b4 b3 Symbol -- -- -- -- -- After Reset 0 0 0 0 0
Bit Function b7 to b0 These bits specify the number of times of DTC data transfers.
Note: 1. When the DTCCT register is set to 00h, the number of transfer times is 256. Each time the DTC is activated, the DTCCT register is decremented by 1.
15.2.4
DTC Transfer Count Reload Register (DTRLD)
b2 -- 0 b1 -- 0 b0 -- 0 Setting Range 00h to FFh (1) R/W --
Address See Table 15.5 Control Data Allocation Addresses. Bit b7 b6 b5 b4 b3 Symbol -- -- -- -- -- After Reset 0 0 0 0 0
Bit Function b7 to b0 This register value is reloaded to the DTCCT register in repeat mode. Note: 1. Set the initial value for the DTCCT register.
15.2.5
DTC Source Address Register (DTSAR)
b2 -- 0 b10 -- 0 b1 -- 0 b9 -- 0 b0 -- 0 b8 -- 0 Setting Range 0000h to FFFFh R/W --
Address See Table 15.5 Control Data Allocation Addresses. Bit b7 b6 b5 b4 b3 Symbol -- -- -- -- -- After Reset 0 0 0 0 0 Bit Symbol After Reset Bit b15 to b0 b15 -- 0 b14 -- 0 b13 -- 0 b12 -- 0 b11 -- 0
Function These bits specify a transfer source address for data transfer.
15.2.6
DTC Destination Register (DTDAR)
b2 -- 0 b10 -- 0 b1 -- 0 b9 -- 0 b0 -- 0 b8 -- 0 Setting Range 0000h to FFFFh R/W --
Address See Table 15.5 Control Data Allocation Addresses. Bit b7 b6 b5 b4 b3 Symbol -- -- -- -- -- After Reset 0 0 0 0 0 Bit Symbol After Reset Bit b15 to b0 b15 -- 0 b14 -- 0 b13 -- 0 b12 -- 0 b11 -- 0
Function These bits specify a transfer destination address for data transfer.
REJ09B0458-0010 Rev.0.10 Page 168 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
15. DTC
15.2.7
DTC Activation Enable Registers (DTCENi) (i = 0 to 3, 5, 6)
Address 0088h (DTCEN0), 0089h (DTCEN1), 008Ah (DTCEN2), 008Bh (DTCEN3), 008Dh (DTCEN5), 008Eh (DTCEN6) Bit b7 b6 b5 b4 b3 b2 b1 b0 Symbol DTCENi7 DTCENi6 DTCENi5 DTCENi4 DTCENi3 -- DTCENi1 DTCENi0 After Reset 0 0 0 0 0 0 0 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol Bit Name DTCENi0 DTC activation enable bit DTCENi1 -- Reserved bit DTCENi3 DTC activation enable bit DTCENi4 DTCENi5 DTCENi6 DTCENi7 Function 0: Activation disabled 1: Activation enabled Set to 0. 0: Activation disabled 1: Activation enabled R/W R/W R/W R/W R/W R/W R/W R/W R/W
i = 0 to 3, 5, 6 The DTCENi registers enable/disable DTC activation by interrupt sources. Table 15.3 shows Correspondences between Bits DTCENi0 to DTCENi1, Bits DTCENi3 to DTCENi7 (i = 0 to 3, 5, 6) and Interrupt Sources. Table 15.3 Correspondences between Bits DTCENi0 to DTCENi1, Bits DTCENi3 to DTCENi7 (i = 0 to 3, 5, 6) and Interrupt Sources
DTCENi7 Bit INT0 Key input I2C bus/SSU receive data full Timer RC input-capture/ comparematch C DTCENi6 Bit INT1 A/D conversion I2C bus/SSU transmit data empty Timer RC input-capture/ comparematch D DTCENi5 Bit -- UART0 reception Voltage monitor 2/ comparator A2 DTCENi4 Bit INT3 UART0 transmission Voltage monitor 1/ comparator A1 DTCENi3 Bit DTCENi1 Bit DTCENi0 Bit
Register DTCEN0 DTCEN1
-- --
--
UART2 reception Timer RC input-capture/ comparematch A
--
UART2 transmission Timer RC input-capture/ comparematch B
DTCEN2
--
DTCEN3 DTCEN5 DTCEN6
-- Timer RE --
-- -- Timer RB
-- --
Flash memory ready status
-- -- --
-- -- --
-- --
--
Timer RA
REJ09B0458-0010 Rev.0.10 Page 169 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
15. DTC
15.2.8
DTC Activation Control Register (DTCTL)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 NMIF 0 b0 -- 0 R/W R/W R/W --
Address 0080h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol -- NMIF -- -- -- -- -- --
Bit Name Function Reserved bit Set to 0. Non-maskable interrupt generation 0: Non-maskable interrupts not generated 1: Non-maskable interrupts generated bit (1) Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Note: 1. This bit is set to 0 when the read result is 1 and 0 is written to the same bit. This bit remains
unchanged even if the read result is 0 and 0 is written to the same bit. This bit remains unchanged if 1 is written to it. The DTCTL register controls DTC activation when a non-maskable interrupt (an interrupt by the watchdog timer, oscillation stop detection, voltage monitor 1, or voltage monitor 2) is generated.
NMIF Bit (Non-Maskable Interrupt Generation Bit)
The NMIF bit is set to 1 when a watchdog timer interrupt, an oscillation stop detection interrupt, a voltage monitor 1 interrupt, or a voltage monitor 2 interrupt is generated. When the NMIF bit is 1, the DTC is not activated even if the interrupt which enables DTC activation is generated. If the NMIF bit is changed to 1 during DTC transfer, the transfer is continued until it is completed.
REJ09B0458-0010 Rev.0.10 Page 170 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
15. DTC
15.3 15.3.1
Function Description Overview
When the DTC is activated, control data is read from the DTC control data area to perform data transfers and control data after data transfer is written back to the DTC control data area. Twenty-four sets of control data can be stored in the DTC control data area, which allows 24 types of data transfers to be performed. There are two transfer modes: normal mode and repeat mode. In addition, multiple transfers can be performed by one activation source (chain transfers) when the CHNE bit in the DTCCR register is set to 1 (chain transfers enabled). A transfer source address is specified by the 16-bit register DTSAR, and a transfer destination address is specified by the 16-bit register DTDAR. The values in the registers DTSAR and DTDAR are separately fixed or incremented according to the control data on completion of the data transfer.
15.3.2
Activation Sources
The DTC is activated by an interrupt source. Figure 15.2 is a Block Diagram Showing Control of DTC Activation Sources. The interrupt sources to activate the DTC are selected with the DTCENi registers (i = 0 to 3, 5, 6). After one data transfer is completed (after the first transfer is completed in chain transfers), set 0 (activation disabled) to either of the following: the interrupt source flag in the status register for the peripheral function which generates the activation source or the corresponding bit among bits DTCENi0 to DTCENi1, and bits DTCENi3 to DTCENi7 in the DTCENi register. Table 15.4 shows the DTC Activation Sources and Interrupt Source Flags for Setting to 0 at Data Transfer Completion. If multiple activation sources are simultaneously generated, the DTC activation will be performed according to the DTC activation source priority. DTC activation is not affected by the I flag or interrupt control register, unlike with interrupt request operation. Therefore, even if interrupt requests cannot be acknowledged because interrupts are disabled, DTC activation requests can be acknowledged. The IR bit in the interrupt control register does not change when a DTC activation request is acknowledged.
Interrupt controller
Interrupt request Peripheral interrupt request
Peripheral function 1
(I2C
Peripheral function 2 bus/SSU, timer RC, flash memory)
Peripheral interrupt request
Select interrupt source or DTC activation source
DTC activation request
DTC
Select DTC activation or interrupt generation.
DTCENi
Set the interrupt source flag in the status register to 0.
Set the bit among bits DTCENi0 to DTCENi1, DTCENi3 to DTCENi7 (i = 0 to 3, 5, 6) to 0. Clear control
Figure 15.2
Block Diagram Showing Control of DTC Activation Sources
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15. DTC
Table 15.4
DTC Activation Sources and Interrupt Source Flags for Setting to 0 at Data Transfer Completion
DTC activation source generation Interrupt Source Flag for Setting to 0 ICSR register/RDRF bit in SSSR register ICSR register/TDRE bit in SSSR register IMFA bit in TRCSR register IMFB bit in TRCSR register IMFC bit in TRCSR register IMFD bit in TRCSR register RDYSTI bit in FST register
I2C
bus/SSU receive data full
I2C bus/SSU transmit data empty Timer RC input-capture/compare-match A Timer RC input-capture/compare-match B Timer RC input-capture/compare-match C Timer RC input-capture/compare-match D Flash memory ready status
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15. DTC
15.3.3
Control Data Allocation and DTC Vector Table
Control data is allocated in the order: Registers DTCCR, DTBLS, DTCCT, DTRLD, DTSAR, and DTDAR. Table 15.5 shows the Control Data Allocation Addresses. Table 15.5 Control Data Allocation Addresses
Address 2C40h to 2C47h 2C48h to 2C4Fh 2C50h to 2C57h 2C58h to 2C5Fh 2C60h to 2C67h 2C68h to 2C6Fh 2C70h to 2C77h 2C78h to 2C7Fh 2C80h to 2C87h 2C88h to 2C8Fh 2C90h to 2C97h 2C98h to 2C9Fh 2CA0h to 2CA7h 2CA8h to 2CAFh 2CB0h to 2CB7h 2CB8h to 2CBFh 2CC0h to 2CC7h 2CC8h to 2CCFh 2CD0h to 2CD7h 2CD8h to 2CDFh 2CE0h to 2CE7h 2CE8h to 2CEFh 2CF0h to 2CF7h 2CF8h to 2CFFh DTCCR Register 2C40h 2C48h 2C50h 2C58h 2C60h 2C68h 2C70h 2C78h 2C80h 2C88h 2C90h 2C98h 2CA0h 2CA8h 2CB0h 2CB8h 2CC0h 2CC8h 2CD0h 2CD8h 2CE0h 2CE8h 2CF0h 2CF8h DTBLS Register 2C41h 2C49h 2C51h 2C59h 2C61h 2C69h 2C71h 2C79h 2C81h 2C89h 2C91h 2C99h 2CA1h 2CA9h 2CB1h 2CB9h 2CC1h 2CC9h 2CD1h 2CD9h 2CE1h 2CE9h 2CF1h 2CF9h DTCCT Register 2C42h 2C4Ah 2C52h 2C5Ah 2C62h 2C6Ah 2C72h 2C7Ah 2C82h 2C8Ah 2C92h 2C9Ah 2CA2h 2CAAh 2CB2h 2CBAh 2CC2h 2CCAh 2CD2h 2CDAh 2CE2h 2CEAh 2CF2h 2CFAh DTRLD Register 2C43h 2C4Bh 2C53h 2C5Bh 2C63h 2C6Bh 2C73h 2C7Bh 2C83h 2C8Bh 2C93h 2C9Bh 2CA3h 2CABh 2CB3h 2CBBh 2CC3h 2CCBh 2CD3h 2CDBh 2CE3h 2CEBh 2CF3h 2CFBh DTSAR Register (Lower 8 Bits) 2C44h 2C4Ch 2C54h 2C5Ch 2C64h 2C6Ch 2C74h 2C7Ch 2C84h 2C8Ch 2C94h 2C9Ch 2CA4h 2CACh 2CB4h 2CBCh 2CC4h 2CCCh 2CD4h 2CDCh 2CE4h 2CECh 2CF4h 2CFCh DTSAR Register (Higher 8 Bits) 2C45h 2C4Dh 2C55h 2C5Dh 2C65h 2C6Dh 2C75h 2C7Dh 2C85h 2C8Dh 2C95h 2C9Dh 2CA5h 2CADh 2CB5h 2CBDh 2CC5h 2CCDh 2CD5h 2CDDh 2CE5h 2CEDh 2CF5h 2CFDh DTDAR Register (Lower 8 Bits) 2C46h 2C4Eh 2C56h 2C5Eh 2C66h 2C6Eh 2C76h 2C7Eh 2C86h 2C8Eh 2C96h 2C9Eh 2CA6h 2CAEh 2CB6h 2CBEh 2CC6h 2CCEh 2CD6h 2CDEh 2CE6h 2CEEh 2CF6h 2CFEh DTDAR Register (Higher 8 Bits) 2C47h 2C4Fh 2C57h 2C5Fh 2C67h 2C6Fh 2C77h 2C7Fh 2C87h 2C8Fh 2C97h 2C9Fh 2CA7h 2CAFh 2CB7h 2CBFh 2CC7h 2CCFh 2CD7h 2CDFh 2CE7h 2CEFh 2CF7h 2CFFh
Register Control Symbol Data No. DTCD0 DTCD1 DTCD2 DTCD3 DTCD4 DTCD5 DTCD6 DTCD7 DTCD8 DTCD9 DTCD10 DTCD11 DTCD12 DTCD13 DTCD14 DTCD15 DTCD16 DTCD17 DTCD18 DTCD19 DTCD20 DTCD21 DTCD22 DTCD23 Control Data 0 Control Data 1 Control Data 2 Control Data 3 Control Data 4 Control Data 5 Control Data 6 Control Data 7 Control Data 8 Control Data 9 Control Data 10 Control Data 11 Control Data 12 Control Data 13 Control Data 14 Control Data 15 Control Data 16 Control Data 17 Control Data 18 Control Data 19 Control Data 20 Control Data 21 Control Data 22 Control Data 23
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15. DTC
When the DTC is activated, one control data is selected according to the data read from the vector table which has been assigned to each activation source, and the selected control data is read from the DTC control data area. Table 15.6 shows the DTC Activation Sources and DTC Vector Addresses. A one-byte vector table area is assigned to each activation source and one value from 00000000b to 00010111b is stored in each area to select one of the 24 control data sets. Figure 15.3 shows a DTC Internal Operation Flowchart. Table 15.6 DTC Activation Sources and DTC Vector Addresses
Interrupt Name INT0 INT1 (Reserved) INT3 (Reserved) Key input A/D conversion UART0 reception UART0 transmission -- -- UART2 reception UART2 transmission Receive data full Transmit data empty Voltage monitor 2/comparator A2 Voltage monitor 1/comparator A1 Input-capture/compare-match A Input-capture/compare-match B Input-capture/compare-match C Input-capture/compare-match D -- -- -- -- -- -- -- -- Timer RE Timer RA Timer RB Flash memory ready status Source No. 0 1 2 3 4 8 9 10 11 12 13 14 15 16 17 18 19 22 23 24 25 26 27 28 29 30 31 32 33 42 49 51 52 DTC Vector Address 2C00h 2C01h 2C02h 2C03h 2C04h 2C08h 2C09h 2C0Ah 2C0Bh 2C0Ch 2C0Dh 2C0Eh 2C0Fh 2C10h 2C11h 2C12h 2C13h 2C16h 2C17h 2C18h 2C19h 2C1Ah 2C1Bh 2C1Ch 2C1Dh 2C1Eh 2C1Fh 2C20h 2C21h 2C2Ah 2C31h 2C33h 2C34h Priority High
Interrupt Request Source External input
Key input A/D UART0 (Reserved) UART2 I2C bus/SSU Voltage detection circuit Timer RC
(Reserved)
Timer RE Timer RA Timer RB Flash memory
Low
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15. DTC
DTC activation source generation
Yes
NMIF = 1?
No
Read DTC vector
Read control data
Transfer data
Branch 1 On completion of DTC transfer (on completion of the first DTC transfer in chain transfers), 0 is written to the bit among bits DTCENi0 to DTCENi1, DTCENi3 to DTCENi7 and an interrupt request is generated in either of the following: - When the DTCCT register value changes to 0 in normal mode - When the RPTINT bit is 1 and the DTCCT register value changes to 0 in repeat mode Branch 2 0 is written to the interrupt source flag in the peripheral status register when the DTC activation source is either of the following: - I2C bus/SSU receive data full - I2C bus/SSU transmit data empty - timer RC input-capture/compare-match A to D - Flash memory ready status DTCENi0 to DTCENi1, DTCENi3 to DTCENi7: Bits in DTCENi registers (i = 0 to 3, 5, 6) RPTINT: Bit in DTCCR register
Write back control data
CHNE = 1?
Yes
No
Branch 1
Yes
No
Branch 2
No
Write 0 to the bit among DTCENi0 to DTCENi1, DTCENi3 to DTCENi7
Yes
Write 0 to the interrupt source flag in the status register
Generate an interrupt request for the CPU
End
Interrupt handling
Figure 15.3
DTC Internal Operation Flowchart
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15. DTC
15.3.4
Normal Mode
One to 256 bytes of data are transferred by one activation. The number of transfer times can be 1 to 256. When the specified number of transfer times is completed, an interrupt request is generated for the CPU. Table 15.7 shows Register Functions in Normal Mode. Figure 15.4 shows Data Transfers in Normal Mode. Table 15.7 Register Functions in Normal Mode
Symbol DTBLS DTCCT DTRLD DTSAR DTDAR Function Size of the data block to be transferred by one activation Number of times of data transfers Not used Data transfer source address Data transfer destination address
Register DTC block size register DTC transfer count register DTC transfer count reload register DTC source address register DTC destination address register
Transfer source SRC Transfer
Transfer destination DST Size of the data block to be transferred by one activation (N bytes)
DTBLS = N DTSAR = SRC DTDAR = DST
Bits b3 to b0 in DTCCR register 00X0b 01X0b 10X0b 11X0b X: 0 or 1
Source address Destination address control control Fixed Incremented Fixed Incremented Fixed Fixed Incremented Incremented
Source address after transfer SRC SRC+N SRC SRC+N
Destination address after transfer DST DST DST+N DST+N
Figure 15.4
Data Transfers in Normal Mode
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15. DTC
15.3.5
Repeat Mode
One to 255 bytes of data are transferred by one activation. Either of the transfer source or destination should be specified as the repeat area. The number of transfer times can be 1 to 255. On completion of the specified number of transfer times, the DTCCT register and the address specified for the repeat area are initialized to continue transfers. When the RPTINT bit in the DTCCR register is 1 to enable the interrupt generation, an interrupt request is generated for the CPU after the specified number of transfer times. The lower 8 bits of the initial value for the repeat area address must be 00h. The size of data to be transferred must be set to 255 bytes or less before the specified number of transfer times is completed. Table 15.8 shows Register Functions in Repeat Mode. Figure 15.5 shows Data Transfers in Repeat Mode. Table 15.8 Register Functions in Repeat Mode
Symbol DTBLS DTCCT DTRLD DTSAR DTDAR Function Size of the data block to be transferred by one activation Number of times of data transfers This register value is reloaded to the DTCCT register. (Data transfer count is initialized.) Data transfer source address Data transfer destination address
Register DTC block size register DTC transfer count register DTC transfer count reload register DTC source address register DTC destination address register
DTCCT register 1
Transfer source SRC Transfer
Transfer destination DST Size of the data block to be transferred by one activation (N bytes) DTBLS = N DTCCT 1 DTSAR = SRC DTDAR = DST
Bits b3 to b0 in DTCCR register 0X11b 1X11b X001b X101b X: 0 or 1 DTCCT register = 1
Source address Destination address control control Repeat area Repeat area Fixed Incremented Fixed Incremented Repeat area Repeat area
Source address after transfer SRC+N SRC+N SRC SRC+N
Destination address after transfer DST DST+N DST+N DST+N
Repeat area SRC0/DST0
...
Address of the repeat area is initialized after a transfer.
SRC/DST
DTBLS = N DTCCT = 1 DTSAR = SRC DTDAR = DST
Bits b3 to b0 in DTCCR register 0X11b 1X11b X001b X101b
Source address Destination address control control Repeat area Repeat area Fixed Incremented Fixed Incremented Repeat area Repeat area
Source address after transfer SRC0 SRC0 SRC SRC+N
Destination address after transfer DST DST+N DST0 DST0
SRC0: Initial source address value DST0: Initial destination address value X: 0 or 1
Figure 15.5
Data Transfers in Repeat Mode Apr 01, 2008
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15. DTC
15.3.6
Chain Transfers
When the CHNE bit in the DTCCR register is 1 (chain transfers enabled), multiple data transfers can be continuously performed by one activation source. Figure 15.6 shows a Flow of Chain Transfers. When the DTC is activated, one control data is selected according to the data read from the DTC vector address corresponding to the activation source, and the selected control data is read from the DTC control data area. When the CHNE bit for the control data is 1 (chain transfers enabled), the next control data immediately following the current control data is read and transferred after the current transfer is completed. This operation is repeated until the data transfer with the control data for which the CHNE bit is 0 (chain transfers disabled) is completed.
DTC activation source generation
Read DTC vector
Read control data 1
DTC control data area
Control data 1 CHNE = 1
Transfer data
Control data 2 CHNE = 0
Write back control data 1
Read control data 2
Data transfer
Write back control data 2
CHNE: Bit in DTCCR register
End of DTC transfers
Figure 15.6
Flow of Chain Transfers
15.3.7
Interrupt Sources
When the specified number of times of data transfers is completed in normal mode or when completed while the PRTINT bit in the DTCCR register is 1 (interrupt generation enabled) in repeat mode, the interrupt request corresponding to the activation source is generated for the CPU. Interrupt requests for the CPU are affected by the I flag or interrupt control register. In chain transfers, whether the interrupt request is generated or not is determined either by the number of transfer times specified for the first type of the transfer or the RPTINT bit. When an interrupt request is generated for the CPU, the bit among bits DTCENi0 to DTCENi1, and bits DTCENi3 to DTCENi7 in the DTCENi registers (i = 0 to 3, 5, 6) corresponding to the activation source are set to 0 (activation disabled).
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15. DTC
15.3.8
Operation Timings
The DTC requires four clock cycles to read control data allocated in the DTC control data area. The number of clock cycles required to write back control data differs depending on the control data settings. Figure 15.7 shows an Example of DTC Operation Timings and Figure 15.8 shows an Example of DTC Operation Timings in Chain Transfers. Table 15.9 shows the Specifications of Control Data Write-Back Operation.
CPU clock Read vector Address
Used by CPU Read Write Used by CPU
Read control data
Transfer data
Write back control data
Figure 15.7
Example of DTC Operation Timings
CPU clock Read vector Address Used by CPU Read Write Read Write Used by CPU
Read control data
Transfer data
Write back control data
Read control data
Transfer data Write back control data
Figure 15.8
Example of DTC Operation Timings in Chain Transfers
Table 15.9
Bits b3 to b0 in DTCCR Register 00X0b 01X0b 10X0b 11X0b 0X11b 1X11b X001b X101b
Specifications of Control Data Write-Back Operation
Operating Mode Address Control Source Fixed Normal mode Incremented Fixed Destination Fixed Fixed Incremented Control Data to be Written Back DTRLD DTSAR DTDAR Register Register Register Not written Not written Written back Written back back back Not written Written back Written back Written back back Not written Written back Written back Written back back Written back Written back Written back Written back Not written Written back Written back Written back back Written back Written back Written back Written back Not written Written back Written back Written back back Written back Written back Written back Written back DTCCT Register Number of Clock Cycles 1 2 2 3 2 3 2 3
Incremented Incremented Repeat area Repeat mode Fixed Incremented Fixed Incremented Repeat area
X: 0 or 1
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R8C/32A Group
15. DTC
15.3.9
Number of DTC Execution Cycles
Table 15.10 shows the Operations Following DTC Activation and Required Number of Cycles for each operation. Table 15.11 shows the Number of Clock Cycles Required for Data Transfers. Table 15.10 Operations Following DTC Activation and Required Number of Cycles
Control Data Read Write (J) 5 to 7 5 to 7 Data Read Data Write Internal Operation 2 2
Vector Read 1 1
(Note 1) (Note 1)
(Note 1) (Note 1)
Note: 1. For the number of clock cycles required for data read/write, see Table 15.11 Number of Clock Cycles Required for Data Transfers. Data is transferred as described below, when the DTBLS register = N, (1) When N = 2n (even), two-byte transfers are performed n times. (2) When N = 2n + 1 (odd), two-byte transfers are performed n times followed by one time of one-byte transfer. Table 15.11
Operation
Number of Clock Cycles Required for Data Transfers
Unit of Transfers 1-byte SK1 2-byte SK2 1-byte SL1 2-byte SL2 On-Chip RAM (During DTC Transfers) Even Odd Address Address 1 1 2 1 1 2 On-Chip ROM (User Area) 1 2 On-Chip ROM (Data Area) 2 4 SFR (Word Access) Even Odd Address Address 2 2 4 2 2 4 SFR (Byte Access) 2 4 2 4
Data read Data write
-- --
-- --
From Tables 15.10 and 15.11, the total number of required execution cycles can be obtained by the following formula: Number of required execution cycles = 1 + [formula A] + 2 : Sum of the cycles for the number of transfer times performed by one activation source ([the number of transfer times for which CHNE is set to 1] + 1) (1) For N = 2n (even) Formula A = J + n * SK2 + n * SL2 (2) For N = 2n+1 (odd) Formula A = J + n * SK2 + 1 * SK1 + n * SL2 + 1 * SL1 J: Number of cycles required to read or write back control data
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15. DTC
15.4 15.4.1
Notes on DTC DTC activation source
* Do not generate any DTC activation sources before entering wait mode or during wait mode. * Do not generate any DTC activation sources before entering stop mode or during stop mode.
15.4.2
DTCENi Registers (i = 0 to 3, 5, 6)
* Modify bits DTCENi0 to DTCENi1, and bits DTCENi3 to DTCENi7 only while an interrupt request corresponding to the bit is not generated. * When the interrupt source flag in the status register for the peripheral function is 1, do not modify the corresponding activation source bit among bits DTCENi0 to DTCENi1, and bits DTCENi3 to DTCENi7. * Do not access the DTCENi registers using DTC transfers.
15.4.3
Peripheral Modules
* Do not set the status register bit for the peripheral function to 0 using a DTC transfer. * When the DTC activation source is I2C bus/SSU receive data full, read the SSRDR register/the ICDRR register using a DTC transfer. * When the DTC activation source is I2C bus/SSU transmit data empty, write to the SSTDR register/the ICDRT register using a DTC transfer.
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16. General Overview of Timers
16. General Overview of Timers
The MCU has two 8-bit timers with 8-bit prescalers, a 16-bit timer, and a timer with a 4-bit counter and an 8-bit counter. The two 8-bit timers with 8-bit prescalers are timer RA and timer RB. These timers contain a reload register to store the default value of the counter. The 16-bit timers are timer RC, and have input capture and output compare functions. The 4-bit and 8-bit counters are timer RE, and has an output compare function. All the timers operate independently. Table 16.1 lists Functional Comparison of Timers.
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16. General Overview of Timers
Table 16.1
Configuration Count Count sources
Functional Comparison of Timers
Item Timer RA 8-bit timer with 8-bit prescaler (with reload register) Decrement * f1 * f2 * f8 * fOCO * fC32 * fC Timer mode Event counter mode Pulse width measurement mode, pulse period measurement mode Pulse output mode (1), Event counter mode (1) -- Timer RB 8-bit timer with 8-bit prescaler (with reload register) Decrement * f1 * f2 * f8 * Timer RA underflow Timer RC 16-bit timer (with input capture and output compare) Increment * f1 * f2 * f4 * f8 * f32 * fOCO40M * fOCO-F * TRCCLK Timer mode (output compare function) Timer mode (output compare function) Timer mode (input capture function; 4 pins) Timer mode (output compare function; 4 pins) (1), PWM mode (3 pins), PWM2 mode (1 pin) PWM mode (3 pins) Timer RE 4-bit counter 8-bit counter Increment * f4 * f8 * f32 * fC4
Function
Count of the internal count source Count of the external count source External pulse width/ period measurement PWM output
Timer mode -- --
-- -- --
Programmable waveform generation mode Programmable oneshot generation mode, Programmable wait one-shot generation mode -- -- INT0
Output compare mode (1)
One-shot waveform output
--
Three-phase waveforms output Timer Input pin
-- Timer mode (only fC32 count) TRAIO
-- -- INT0, TRCCLK, TRCTRG, TRCIOA, TRCIOB, TRCIOC, TRCIOD TRCIOA, TRCIOB, TRCIOC, TRCIOD Compare match/input capture A to D interrupt, Overflow interrupt, INT0 interrupt Provided
-- Real-time clock mode --
Output pin Related interrupt
TRAO TRAIO Timer RA interrupt
TRBO Timer RB interrupt, INT0 interrupt
-- Timer RE interrupt
Timer stop
Provided
Provided
Provided
Note: 1. Rectangular waves are output in these modes. Since the waves are inverted at each overflow, the "H" and "L" level widths of the pulses are the same.
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17. Timer RA
17. Timer RA
Timer RA is an 8-bit timer with an 8-bit prescaler.
17.1
Overview
The prescaler and timer each consist of a reload register and counter. The reload register and counter are allocated at the same address, and can be accessed when accessing registers TRAPRE and TRA (refer to Tables 17.2 to 17.6 the Specification of Each Modes). The count source for timer RA is the operating clock that regulates the timing of timer operations such as counting and reloading. Figure 17.1 shows a Timer RA Block Diagram. Table 17.1 lists Pin Configuration of Timer RA. Timer RA contains the following five operating modes: * Timer mode: The timer counts the internal count source. * Pulse output mode: The timer counts the internal count source and outputs pulses which invert the polarity by underflow of the timer. * Event counter mode: The timer counts external pulses. * Pulse width measurement mode: The timer measures the pulse width of an external pulse. * Pulse period measurement mode: The timer measures the pulse period of an external pulse.
TCK2 to TCK0 bit
f1 f8 fOCO f2 fC32 fC
= 000b = 001b = 010b = 011b = 100b
= 110b
= 00b = 10b
TMOD2 to TMOD0 = other than 010b
Data bus
TIOGT1 to TIOGT0 bits
Event input always enabled = 01b Do not set
TCKCUT bit
TCSTF bit
Reload register
Reload register
Event enabled for "H" period of TRCIOD (timer RC compare match signal)
Underflow signal
TMOD2 to TMOD0 = 010b
Counter TRAPRE register (prescaler)
Counter TRA register (timer)
Timer RA interrupt
TIPF1 to TIPF0 bits
f1 = 10b f8 = 11b f32
= 01b
Digital filter
TIPF1 to TIPF0 bits = other than 000b
TMOD2 to TMOD0 = 011b or 100b
Polarity switching
= 00b
Count control circle
Measurement completion signal
Toggle flip-flop
CLR
TRAIO pin
(1)
TMOD2 to TMOD0 = 001b TEDGSEL = 1 TOPCR bit Q
TOENA bit
Q
CK
TEDGSEL = 0
TRAO pin
Write to TRAMR register Write 1 to TSTOP bit TCSTF, TSTOP: TRACR register TEDGSEL, TOPCR, TOENA, TIPF1, TIPF0, TIOGT1, TIOGT0: TRAIOC register TMOD2 to TMOD0, TCK2 to TCK0, TCKCUT: TRAMR register
Note: 1. Bits TRAIOSEL0 and TRAIOSEL1 in the TRASR register are used to select which pin is assigned.
Figure 17.1
Timer RA Block Diagram
Table 17.1 Pin Name TRAIO TRAO
Pin Configuration of Timer RA Assigned Pin P1_5 or P1_7 P3_7 I/O I/O Output Function Function differs according to the mode. Refer to descriptions of individual modes for details
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17. Timer RA
17.2 17.2.1
Registers Timer RA Control Register (TRACR)
b6 -- 0 b5 TUNDF 0 b4 TEDGF 0 b3 -- 0 b2 TSTOP 0 b1 TCSTF 0 b0 TSTART 0 R/W R/W R R/W -- R/W R/W --
Address 0100h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name TSTART Timer RA count start bit (1) TCSTF TSTOP -- TEDGF TUNDF -- --
Function 0: Count stops 1: Count starts 0: Count stops Timer RA count status flag (1) 1: During count (2) When this bit is set to 1, the count is forcibly stopped. Timer RA count forcible stop bit When read, its content is 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0. 0: Active edge not received Active edge judgment flag (3, 4) 1: Active edge received (end of measurement period) 0: No underflow Timer RA underflow flag (3, 4) 1: Underflow Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Notes: 1. Refer to 17.8 Notes on Timer RA for precautions regarding bits TSTART and TCSTF. 2. When the TSTOP bit is set to 1, bits TSTART and TCSTF and registers TPRAPRE and TRA are set to the values after a reset. 3. Bits TEDGF and TUNDF can be set to 0 by writing 0 to these bits by a program. However, their value remains unchanged when 1 is written. 4. Set to 0 in timer mode, pulse output mode, and event counter mode.
In pulse width measurement mode and pulse period measurement mode, use the MOV instruction to set the TRACR register. If it is necessary to avoid changing the values of bits TEDGF and TUNDF, write 1 to them.
17.2.2
Timer RA I/O Control Register (TRAIOC)
b6 TIOGT0 0 b5 TIPF1 0 b4 TIPF0 0 b3 TIOSEL 0 b2 TOENA 0 b1 b0 TOPCR TEDGSEL 0 0
Address 0101h Bit b7 Symbol TIOGT1 After Reset Bit b0 b1 b2 b3 b4 b5 b6 b7 0
Symbol TEDGSEL TOPCR TOENA TIOSEL TIPF0 TIPF1 TIOGT0 TIOGT1
Bit Name TRAIO polarity switch bit TRAIO output control bit TRAO output enable bit Hardware LIN function select bit TRAIO input filter select bit TRAIO event input control bit
Function R/W Function varies according to the operating mode. R/W R/W R/W R/W R/W R/W R/W R/W
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.2.3
Timer RA Mode Register (TRAMR)
b6 TCK2 0 b5 TCK1 0 b4 TCK0 0 b3 -- 0 b2 TMOD2 0 b1 TMOD1 0 Function
b2 b1 b0
Address 0102h Bit b7 Symbol TCKCUT After Reset 0 Bit b0 b1 b2
b0 TMOD0 0 R/W R/W R/W R/W
b3 b4 b5 b6
b7
0 0 0: Timer mode 0 0 1: Pulse output mode 0 1 0: Event counter mode 0 1 1: Pulse width measurement mode 1 0 0: Pulse period measurement mode 1 0 1: Do not set. 1 1 0: Do not set. 1 1 1: Do not set. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. b6 b5 b4 TCK0 Timer RA count source select bit 0 0 0: f1 TCK1 0 0 1: f8 TCK2 0 1 0: fOCO 0 1 1: f2 1 0 0: fC32 1 0 1: Do not set. 1 1 0: fC 1 1 1: Do not set. TCKCUT Timer RA count source cutoff bit 0: Provides count source 1: Cuts off count source
Symbol Bit Name TMOD0 Timer RA operating mode select bit TMOD1 TMOD2
-- R/W R/W R/W
R/W
When both the TSTART and TCSTF bits in the TRACR register are set to 0 (count stops), rewrite this register.
17.2.4
Timer RA Prescaler Register (TRAPRE)
b6 -- 1 b5 -- 1 b4 -- 1 b3 -- 1 b2 -- 1 b1 -- 1 b0 -- 1
Address 0103h Bit b7 Symbol -- After Reset 1
(Note 1) R/W R/W R/W R/W R/W R/W
Bit Mode b7 to b0 Timer mode Pulse output mode Event counter mode Pulse width measurement mode
Function Counts an internal count source
Counts an external count source Measure pulse width of input pulses from external (counts internal count source) Pulse period measurement mode Measure pulse period of input pulses from external (counts internal count source)
Setting Range 00h to FFh 00h to FFh 00h to FFh 00h to FFh 00h to FFh
Note: 1. When the TSTOP bit in the TRACR register is set to 1, the TRAPRE register is set to FFh.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.2.5
Timer RA Register (TRA)
b6 -- 1 b5 -- 1 b4 -- 1 b3 -- 1 b2 -- 1 b1 -- 1 b0 -- 1
Address 0104h Bit b7 Symbol -- After Reset 1 Bit Mode b7 to b0 All modes
(Note 1) R/W R/W
Function Counts on underflow of TRAPRE register
Setting Range 00h to FFh
Note: 1. When the TSTOP bit in the TRACR register is set to 1, the TRAPRE register is set to FFh.
17.2.6
Timer RA Pin Select Register (TRASR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 b0 TRAIOSEL1 TRAIOSEL0 0 0 Function
b1 b0
Address 0180h Bit b7 Symbol -- After Reset 0 Bit b0 b1
Symbol Bit Name TRAIOSEL0 TRAIO pin select bit TRAIOSEL1
b2 b3 b4 b5 b6 b7
-- -- -- -- -- --
Reserved bits
0 0: TRAIO pin not used 0 1: P1_7 assigned 1 0: P1_5 assigned 1 1: Do not set. Set to 0.
R/W R/W R/W
R/W
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
--
The TRASR register selects which pin is assigned to the timer RA I/O. To use the I/O pin for timer RA, set this register. Set the TRASR register before setting the timer RA associated registers. Also, do not change the setting value in this register during timer RA operation.
REJ09B0458-0010 Rev.0.10 Page 187 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.3
Timer Mode
In this mode, the timer counts an internally generated count source (refer to Table 17.2 Timer Mode Specifications).
Table 17.2
Timer Mode Specifications Specification f1, f2, f8, fOCO, fC32 * Decrement * When the timer underflows, the contents of the reload register are reloaded and the count is continued. 1/(n+1)(m+1) n: Value set in TRAPRE register, m: Value set in TRA register 1 (count starts) is written to the TSTART bit in the TRACR register. * 0 (count stops) is written to the TSTART bit in the TRACR register. * 1 (count forcibly stops) is written to the TSTOP bit in the TRACR register. When timer RA underflows [timer RA interrupt]. Programmable I/O port Programmable I/O port The count value can be read by reading registers TRA and TRAPRE. * When registers TRAPRE and TRA are written while the count is stopped, values are written to both the reload register and counter. * When registers TRAPRE and TRA are written during the count, values are written to the reload register and counter (refer to 17.3.2 Timer Write Control during Count Operation).
Item Count sources Count operations
Divide ratio Count start condition Count stop conditions Interrupt request generation timing TRAIO pin function TRAO pin function Read from timer Write to timer
17.3.1
Timer RA I/O Control Register (TRAIOC) in Timer Mode
b6 TIOGT0 0 b5 TIPF1 0 b4 TIPF0 0 b3 TIOSEL 0 b2 TOENA 0 b1 b0 TOPCR TEDGSEL 0 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 0101h Bit b7 Symbol TIOGT1 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol TEDGSEL TOPCR TOENA TIOSEL TIPF0 TIPF1 TIOGT0 TIOGT1
Bit Name TRAIO polarity switch bit TRAIO output control bit TRAO output enable bit Hardware LIN function select bit TRAIO input filter select bit TRAIO event input control bit
Function Set to 0 in timer mode.
Set to 0. However, set to 1 when the hardware LIN function is used. Set to 0 in timer mode.
REJ09B0458-0010 Rev.0.10 Page 188 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.3.2
Timer Write Control during Count Operation
Timer RA has a prescaler and a timer (which counts the prescaler underflows). The prescaler and timer each consist of a reload register and a counter. When writing to the prescaler or timer, values are written to both the reload register and counter. However, values are transferred from the reload register to the counter of the prescaler in synchronization with the count source. In addition, values are transferred from the reload register to the counter of the timer in synchronization with prescaler underflows. Therefore, if the prescaler or timer is written to when count operation is in progress, the counter value is not updated immediately after the WRITE instruction is executed. Figure 17.2 shows an Operating Example of Timer RA when Counter Value is Rewritten during Count Operation.
Set 01h to the TRAPRE register and 25h to the TRA register by a program.
Count source
After writing, the reload register is written to at the first count source. Reload register of timer RA prescaler Previous value Reload at second count source Counter of timer RA prescaler 06h 05h 04h 01h 00h New value (01h) Reload at underflow 01h 00h 01h 00h 01h 00h
After writing, the reload register is written to at the first underflow. Reload register of timer RA Previous value New value (25h) Reload at the second underflow Counter of timer RA 03h 02h 25h 24h
IR bit in TRAIC register
0 The IR bit remains unchanged until underflow is generated by a new value.
The above applies under the following conditions. Both bits TSTART and TCSTF in the TRACR register are set to 1 (during count).
Figure 17.2
Operating Example of Timer RA when Counter Value is Rewritten during Count Operation
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.4
Pulse Output Mode
In pulse output mode, the internally generated count source is counted, and a pulse with inverted polarity is output from the TRAIO pin each time the timer underflows (refer to Table 17.3 Pulse Output Mode Specifications).
Table 17.3
Pulse Output Mode Specifications Specification
f1, f2, f8, fOCO, fC32 * Decrement * When the timer underflows, the contents in the reload register is reloaded and the count is continued. Divide ratio 1/(n+1)(m+1) n: Value set in TRAPRE register, m: Value set in TRA register Count start condition 1 (count starts) is written to the TSTART bit in the TRACR register. Count stop conditions * 0 (count stops) is written to the TSTART bit in the TRACR register. * 1 (count forcibly stops) is written to the TSTOP bit in the TRACR register. When timer RA underflows [timer RA interrupt]. Interrupt request generation timing TRAIO pin function Pulse output, programmable output port TRAO pin function Programmable I/O port or inverted output of TRAIO Read from timer The count value can be read by reading registers TRA and TRAPRE. Write to timer * When registers TRAPRE and TRA are written while the count is stopped, values are written to both the reload register and counter. * When registers TRAPRE and TRA are written during the count, values are written to the reload register and counter (refer to 17.3.2 Timer Write Control during Count Operation). Selectable functions * TRAIO signal polarity switch function The level when the pulse output starts is selected by the TEDGSEL bit in the TRAIOC register. (1) * TRAO output function Pulses inverted from the TRAIO output polarity can be output from the TRAO pin (selectable by the TOENA bit in the TRAIOC register). * Pulse output stop function Output from the TRAIO pin is stopped by the TOPCR bit in the TRAIOC register. * TRAIO pin select function P1_5 or P1_7 is selected by bits TRAIOSEL0 to TRAIOSEL1 in the TRASR register. Note: 1. The level of the output pulse becomes the level when the pulse output starts when the TRAMR register is written to.
Item Count sources Count operations
REJ09B0458-0010 Rev.0.10 Page 190 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.4.1
Timer RA I/O Control Register (TRAIOC) in Pulse Output Mode
b6 TIOGT0 0 b5 TIPF1 0 b4 TIPF0 0 b3 TIOSEL 0 b2 TOENA 0 b1 b0 TOPCR TEDGSEL 0 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 0101h Bit b7 Symbol TIOGT1 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name TEDGSEL TRAIO polarity switch bit TOPCR TOENA TIOSEL TIPF0 TIPF1 TIOGT0 TIOGT1 TRAIO output control bit TRAO output enable bit Hardware LIN function select bit TRAIO input filter select bit TRAIO event input control bit
Function 0: TRAIO output starts at "H" 1: TRAIO output starts at "L" 0: TRAIO output 1: Port P1_7 or P1_5 0: Port P3_7 1: TRAO output (inverted TRAIO output from P3_7) Set to 0. Set to 0 in pulse output mode.
REJ09B0458-0010 Rev.0.10 Page 191 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.5
Event Counter Mode
In event counter mode, external signal inputs to the TRAIO pin are counted (refer to Table 17.4 Event Counter Mode Specifications).
Table 17.4
Event Counter Mode Specifications
Specification External signal which is input to TRAIO pin (active edge selectable by a program) * Decrement * When the timer underflows, the contents of the reload register are reloaded and the count is continued. Divide ratio 1/(n+1)(m+1) n: setting value of TRAPRE register, m: setting value of TRA register Count start condition 1 (count starts) is written to the TSTART bit in the TRACR register. Count stop conditions * 0 (count stops) is written to the TSTART bit in the TRACR register. * 1 (count forcibly stops) is written to the TSTOP bit in the TRACR register. When timer RA underflows [timer RA interrupt]. Interrupt request generation timing TRAIO pin function Count source input TRAO pin function Programmable I/O port or pulse output (1) Read from timer Write to timer The count value can be read by reading registers TRA and TRAPRE. * When registers TRAPRE and TRA are written while the count is stopped, values are written to both the reload register and counter. * When registers TRAPRE and TRA are written during the count, values are written to the reload register and counter (refer to 17.3.2 Timer Write Control during Count Operation). * INT1 input polarity switch function The active edge of the count source is selected by the TEDGSEL bit in the TRAIOC register. * Count source input pin select function P1_5 or P1_7 is selected by bits TRAIOSEL0 to TRAIOSEL1 in the TRASR register. * Pulse output function Pulses of inverted polarity can be output from the TRAO pin each time the timer underflows (selectable by the TOENA bit in the TRAIOC register). (1) * Digital filter function Whether enabling or disabling the digital filter and the sampling frequency is selected by bits TIPF0 and TIPF1 in the TRAIOC register. * Event input control function The enabled period for the event input to the TRAIO pin is selected by bits TIOGT0 and TIOGT1 in the TRAIOC register.
Item Count source Count operations
Selectable functions
Note: 1. The level of the output pulse becomes the level when the pulse output starts when the TRAMR register is written to.
REJ09B0458-0010 Rev.0.10 Page 192 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.5.1
Timer RA I/O Control Register (TRAIOC) in Event Counter Mode
b6 TIOGT0 0 b5 TIPF1 0 b4 TIPF0 0 b3 TIOSEL 0 b2 TOENA 0 b1 b0 TOPCR TEDGSEL 0 0 R/W R/W
Address 0101h Bit b7 Symbol TIOGT1 After Reset 0 Bit b0
Symbol Bit Name TEDGSEL TRAIO polarity switch bit
b1 b2 b3 b4 b5
TOPCR TOENA TIOSEL TIPF0 TIPF1
b6 b7
TIOGT0 TIOGT1
Function 0: Starts counting at rising edge of the TRAIO input and TRAO starts output at "L" 1: Starts counting at falling edge of the TRAIO input and TRAO starts output at "H" TRAIO output control bit Set to 0 in event counter mode. TRAO output enable bit 0: Port P3_7 1: TRAO output Hardware LIN function select bit Set to 0. b5 b4 TRAIO input filter select bit (1) 0 0: No filter 0 1: Filter with f1 sampling 1 0: Filter with f8 sampling 1 1: Filter with f32 sampling b7 b6 TRAIO event input control bit 0 0: Event input always enabled 0 1: Do not set. 1 0: Event enabled for "H" period of timer RC compare match signal 1 1: Do not set.
R/W R/W R/W R/W R/W
R/W R/W
Note: 1. When the same value from the TRAIO pin is sampled three times continuously, the input is determined.
REJ09B0458-0010 Rev.0.10 Page 193 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.6
Pulse Width Measurement Mode
In pulse width measurement mode, the pulse width of an external signal input to the TRAIO pin is measured (refer to Table 17.5 Pulse Width Measurement Mode Specifications). Figure 17.3 shows an Operating Example of Pulse Width Measurement Mode.
Table 17.5
Pulse Width Measurement Mode Specifications Specification f1, f2, f8, fOCO, fC32 * Decrement * Continuously counts the selected signal only when measurement pulse is "H" level, or conversely only "L" level. * When the timer underflows, the contents of the reload register are reloaded and the count is continued. 1 (count starts) is written to the TSTART bit in the TRACR register. * 0 (count stops) is written to the TSTART bit in the TRACR register. * 1 (count forcibly stops) is written to the TSTOP bit in the TRACR register. * When timer RA underflows [timer RA interrupt]. * Rising or falling of the TRAIO input (end of measurement period) [timer RA interrupt] Measured pulse input Programmable I/O port The count value can be read by reading registers TRA and TRAPRE. * When registers TRAPRE and TRA are written while the count is stopped, values are written to both the reload register and counter. * When registers TRAPRE and TRA are written during the count, values are written to the reload register and counter (refer to 17.3.2 Timer Write Control during Count Operation). * Measurement level setting The "H" level or "L" level period is selected by the TEDGSEL bit in the TRAIOC register. * Measured pulse input pin select function P1_5 or P1_7 is selected by bits TRAIOSEL0 to TRAIOSEL1 in the TRASR register. * Digital filter function Whether enabling or disabling the digital filter and the sampling frequency is selected by bits TIPF0 and TIPF1 in the TRAIOC register.
Item Count sources Count operations
Count start condition Count stop conditions Interrupt request generation timing TRAIO pin function TRAO pin function Read from timer Write to timer
Selectable functions
REJ09B0458-0010 Rev.0.10 Page 194 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.6.1
Timer RA I/O Control Register (TRAIOC) in Pulse Width Measurement Mode
b6 TIOGT0 0 b5 TIPF1 0 b4 TIPF0 0 b3 TIOSEL 0 b2 TOENA 0 b1 b0 TOPCR TEDGSEL 0 0 R/W R/W R/W R/W R/W R/W R/W
Address 0101h Bit b7 Symbol TIOGT1 After Reset 0 Bit b0 b1 b2 b3 b4 b5
Symbol Bit Name TEDGSEL TRAIO polarity switch bit TOPCR TOENA TIOSEL TIPF0 TIPF1 TRAIO output control bit TRAO output enable bit Hardware LIN function select bit TRAIO input filter select bit (1)
Function 0: TRAIO input starts at "L" 1: TRAIO input starts at "H" Set to 0 in pulse width measurement mode. Set to 0. However, set to 1 when the hardware LIN function is used.
b5 b4
b6 b7
TIOGT0 TIOGT1
TRAIO event input control bit
0 0: No filter 0 1: Filter with f1 sampling 1 0: Filter with f8 sampling 1 1: Filter with f32 sampling Set to 0 in pulse width measurement mode.
R/W R/W
Note: 1. When the same value from the TRAIO pin is sampled three times continuously, the input is determined.
REJ09B0458-0010 Rev.0.10 Page 195 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.6.2
Operating Example
n = high level: the contents of TRA register, low level: the contents of TRAPRE register FFFFh n
Content of counter (hex)
Count start
Underflow
Count stop
Count stop
0000h Set to 1 by program TSTART bit in TRACR register 1 0
Count start
Count start Period
Measured pulse (TRAIO pin input)
1 0 Set to 0 when interrupt request is acknowledged, or set by program
IR bit in TRAIC register
1 0 Set to 0 by program
TEDGF bit in TRACR register
1 0 Set to 0 by program
TUNDF bit in TRACR register
1 0
The above applies under the following conditions. * "H" level width of measured pulse is measured. (TEDGSEL = 1) * TRAPRE = FFh
Figure 17.3
Operating Example of Pulse Width Measurement Mode
REJ09B0458-0010 Rev.0.10 Page 196 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.7
Pulse Period Measurement Mode
In pulse period measurement mode, the pulse period of an external signal input to the TRAIO pin is measured (refer to Table 17.6 Pulse Period Measurement Mode Specifications). Figure 17.4 shows an Operating Example of Pulse Period Measurement Mode.
Table 17.6
Pulse Period Measurement Mode Specifications Specification f1, f2, f8, fOCO, fC32 * Decrement * After the active edge of the measured pulse is input, the contents of the readout buffer are retained at the first underflow of timer RA prescaler. Then timer RA reloads the contents in the reload register at the second underflow of timer RA prescaler and continues counting. 1 (count starts) is written to the TSTART bit in the TRACR register. * 0 (count stops) is written to TSTART bit in the TRACR register. * 1 (count forcibly stops) is written to the TSTOP bit in the TRACR register. * When timer RA underflows or reloads [timer RA interrupt]. * Rising or falling of the TRAIO input (end of measurement period) [timer RA interrupt] Measured pulse input (1) Programmable I/O port The count value can be read by reading registers TRA and TRAPRE. * When registers TRAPRE and TRA are written while the count is stopped, values are written to both the reload register and counter. * When registers TRAPRE and TRA are written during the count, values are written to the reload register and counter (refer to 17.3.2 Timer Write Control during Count Operation). * Measurement period selection The measurement period of the input pulse is selected by the TEDGSEL in the TRAIOC register. * Measured pulse input pin select function P1_5 or P1_7 is selected by bits TRAIOSEL0 to TRAIOSEL1 in the TRASR register. * Digital filter function Whether enabling or disabling the digital filter and the sampling frequency is selected by bits TIPF0 and TIPF1 in the TRAIOC register.
Item Count sources Count operations
Count start condition Count stop conditions Interrupt request generation timing TRAIO pin function TRAO pin function Read from timer Write to timer
Selectable functions
Note: 1. Input a pulse with a period longer than twice the timer RA prescaler period. Input a pulse with a longer "H" and "L" width than the timer RA prescaler period. If a pulse with a shorter period is input to the TRAIO pin, the input may be ignored.
REJ09B0458-0010 Rev.0.10 Page 197 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.7.1
Timer RA I/O Control Register (TRAIOC) in Pulse Period Measurement Mode
b6 TIOGT0 0 b5 TIPF1 0 b4 TIPF0 0 b3 TIOSEL 0 b2 TOENA 0 b1 b0 TOPCR TEDGSEL 0 0 R/W R/W
Address 0101h Bit b7 Symbol TIOGT1 After Reset 0 Bit b0
Symbol Bit Name TEDGSEL TRAIO polarity switch bit
b1 b2 b3 b4 b5
TOPCR TOENA TIOSEL TIPF0 TIPF1
TRAIO output control bit TRAO output enable bit Hardware LIN function select bit TRAIO input filter select bit (1)
Function 0: Measures measurement pulse from one rising edge to next rising edge 1: Measures measurement pulse from one falling edge to next falling edge Set to 0 in pulse period measurement mode. Set to 0.
b5 b4
b6 b7
TIOGT0 TIOGT1
TRAIO event input control bit
0 0: No filter 0 1: Filter with f1 sampling 1 0: Filter with f8 sampling 1 1: Filter with f32 sampling Set to 0 in pulse period measurement mode.
R/W R/W R/W R/W R/W
R/W R/W
Note: 1. When the same value from the TRAIO pin is sampled three times continuously, the input is determined.
REJ09B0458-0010 Rev.0.10 Page 198 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.7.2
Operating Example
Underflow signal of timer RA prescaler
Set to 1 by program
TSTART bit in TRACR register
1 0
Count start
Measurement pulse (TRAIO pin input)
1 0
TRA reloaded TRA reloaded
Contents of TRA
0Fh 0Eh 0Dh 0Fh 0Eh 0Dh 0Ch 0Bh 0Ah 09h 0Fh 0Eh 0Dh
01h 00h 0Fh 0Eh
Underflow
Retained
Retained
Contents of read-out buffer (1)
0Fh
0Eh
0Dh
0Bh 0Ah
09h
0Dh
01h 00h 0Fh 0Eh
TRA read (3) (Note 2) (Note 2)
TEDGF bit in TRACR register
1 0
Set to 0 by program (Note 4) (Note 6)
TUNDF bit in TRACR register
1 0
Set to 0 by program (Note 5)
IR bit in TRAIC register
1 0
Set to 0 when interrupt request is acknowledged, or set by program
Conditions: The period from one rising edge to the next rising edge of the measured pulse is measured (TEDGSEL = 0) with the default value of the TRA register as 0Fh.
Notes: 1. The contents of the read-out buffer can be read by reading the TRA register in pulse period measurement mode. 2. After an active edge of the measured pulse is input, the TEDGF bit in the TRACR register is set to 1 (active edge received) when the timer RA prescaler underflows for the second time. 3. The TRA register should be read before the next active edge is input after the TEDGF bit is set to 1 (active edge received). The contents in the read-out buffer are retained until the TRA register is read. If the TRA register is not read before the next active edge is input, the measured result of the previous period is retained. 4. To set to 0 by a program, use a MOV instruction to write 0 to the TEDGF bit in the TRACR register. At the same time, write 1 to the TUNDF bit in the TRACR register. 5. To set to 0 by a program, use a MOV instruction to write 0 to the TUNDF bit. At the same time, write 1 to the TEDGF bit. 6. Bits TUNDF and TEDGF are both set to 1 if timer RA underflows and reloads on an active edge simultaneously.
Figure 17.4
Operating Example of Pulse Period Measurement Mode
REJ09B0458-0010 Rev.0.10 Page 199 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
17. Timer RA
17.8
Notes on Timer RA
* Timer RA stops counting after a reset. Set the values in the timer RA and timer RA prescalers before the count starts. * Even if the prescaler and timer RA are read out in 16-bit units, these registers are read 1 byte at a time by the MCU. Consequently, the timer value may be updated during the period when these two registers are being read. * In pulse period measurement mode, bits TEDGF and TUNDF in the TRACR register can be set to 0 by writing 0 to these bits by a program. However, these bits remain unchanged if 1 is written. When using the READMODIFY-WRITE instruction for the TRACR register, the TEDGF or TUNDF bit may be set to 0 although these bits are set to 1 while the instruction is being executed. In this case, write 1 to the TEDGF or TUNDF bit which is not supposed to be set to 0 with the MOV instruction. * When changing to pulse period measurement mode from another mode, the contents of bits TEDGF and TUNDF are undefined. Write 0 to bits TEDGF and TUNDF before the count starts. * The TEDGF bit may be set to 1 by the first timer RA prescaler underflow generated after the count starts. * When using the pulse period measurement mode, leave two or more periods of the timer RA prescaler immediately after the count starts, then set the TEDGF bit to 0. * The TCSTF bit retains 0 (count stops) for 0 to 1 cycle of the count source after setting the TSTART bit to 1 (count starts) while the count is stopped. During this time, do not access registers associated with timer RA (1) other than the TCSTF bit. Timer RA starts counting at the first valid edge of the count source after The TCSTF bit is set to 1 (during count). The TCSTF bit remains 1 for 0 to 1 cycle of the count source after setting the TSTART bit to 0 (count stops) while the count is in progress. Timer RA counting is stopped when the TCSTF bit is set to 0. During this time, do not access registers associated with timer RA (1) other than the TCSTF bit. Note: 1. Registers associated with timer RA: TRACR, TRAIOC, TRAMR, TRAPRE, and TRA. * When the TRAPRE register is continuously written during count operation (TCSTF bit is set to 1), allow three or more cycles of the count source clock for each write interval. * When the TRA register is continuously written during count operation (TCSTF bit is set to 1), allow three or more cycles of the prescaler underflow for each write interval.
REJ09B0458-0010 Rev.0.10 Page 200 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18. Timer RB
Timer RB is an 8-bit timer with an 8-bit prescaler.
18.1
Overview
The prescaler and timer each consist of a reload register and counter (refer to Tables 18.2 to 18.5 the Specifications of Each Mode). Timer RB has timer RB primary and timer RB secondary as reload registers. The count source for timer RB is the operating clock that regulates the timing of timer operations such as counting and reloading. Figure 18.1 shows a Timer RB Block Diagram. Table 18.1 lists Pin Configuration of Timer RB. Timer RB has four operation modes listed as follows: * Timer mode: * Programmable waveform generation mode: * Programmable one-shot generation mode: * Programmable wait one-shot generation mode:
The timer counts an internal count source (peripheral function clock or timer RA underflows). The timer outputs pulses of a given width successively. The timer outputs a one-shot pulse. The timer outputs a delayed one-shot pulse.
Reload register
Data bus TRBSC register Reload register
TRBPR register Reload register
Bits TCK1 to TCK0
f1 f8
Timer RA underflow
= 00b = 01b
= 10b = 11b
TCKCUT bit
f2
Counter TRBPRE register (prescaler)
Timer RB interrupt
Counter (timer RB)
(Timer) TMOD1 to TMOD0 bits = 10b or 11b
TSTART bit
TOSSTF bit
INT0 interrupt
INT0 pin
Digital filter
Input polarity selected to be one edge or both edges
Polarity select INOSEG bit
INOSTG bit
INT0PL bit
Bits TMOD1 to TMOD0 = 01b, 10b, 11b
TOCNT = 0
INT0EN bit
TOPL = 1
Q
Q
TRBO pin
Toggle flip-flop
CLR
CK
P1_3 bit in P1 register
TOCNT = 1
TOPL = 0
TCSTF bit Bits TMOD1 to TMOD0 = 01b, 10b, 11b
TSTART, TCSTF: Bits in TRBCR register TOSSTF: Bit in TRBOCR register TOPL, TOCNT, INOSTG, INOSEG: Bits in TRBIOC register TMOD1 to TMOD0, TCK1 to TCK0, TCKCUT: Bits in TRBMR register
Figure 18.1
Timer RB Block Diagram
Table 18.1 Pin Name
Pin Configuration of Timer RB Assigned Pin I/O Function Pulse output (Programmable waveform generation mode, Programmable one-shot generation mode, Programmable wait oneshot generation mode)
TRBO
P1_3
Output
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.2 18.2.1
Registers Timer RB Control Register (TRBCR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 TSTOP 0 b1 TCSTF 0 b0 TSTART 0 R/W R/W R R/W --
Address 0108h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name TSTART Timer RB count start bit (1) TCSTF TSTOP -- -- -- -- --
Function 0: Count stops 1: Count starts 0: Count stops Timer RB count status flag (1) 1: During count (3) (1, 2) When this bit is set to 1, the count is forcibly Timer RB count forcible stop bit stopped. When read, the content is 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Notes: 1. Refer to 18.7 Notes on Timer RB for precautions regarding bits TSTART, TCSTF and TSTOP. 2. When the TSTOP bit is set to 1, registers TRBPRE, TRBSC, TRBPR, and bits TSTART and TCSTF, and the TOSSTF bit in the TRBOCR register are set to values after a reset. 3. Indicates that count operation is in progress in timer mode or programmable waveform mode. In programmable one-shot generation mode or programmable wait one-shot generation mode, indicates that a one-shot pulse trigger has been acknowledged.
18.2.2
Timer RB One-Shot Control Register (TRBOCR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 TOSSTF 0 b1 TOSSP 0 b0 TOSST 0 R/W R/W R/W
Address 0109h Bit b7 Symbol -- After Reset 0 Bit b0 b1 Symbol TOSST
b2 b3 b4 b5 b6 b7
Function When this bit is set to 1, one-shot trigger generated. When read, its content is 0. TOSSP Timer RB one-shot stop bit When this bit is set to 1, counting of one-shot pulses (including programmable wait one-shot pulses) stops. When read, the content is 0. TOSSTF Timer RB one-shot status flag (1) 0: One-shot stopped 1: One-shot operating (Including wait period) -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- -- --
Bit Name Timer RB one-shot start bit
R --
Note: 1. When 1 is set to the TSTOP bit in the TRBCR register, the TOSSTF bit is set to 0.
This register is enabled when bits TMOD1 to TMOD0 in the TRBMR register is set to 10b (programmable oneshot generation mode) or 11b (programmable wait one-shot generation mode).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.2.3
Timer RB I/O Control Register (TRBIOC)
b6 -- 0 b5 -- 0 b4 -- 0 b3 b2 INOSEG INOSTG 0 0 b1 TOCNT 0 b0 TOPL 0 R/W R/W R/W R/W R/W --
Address 010Ah Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol TOPL TOCNT INOSTG INOSEG -- -- -- --
Bit Name Function Timer RB output level select bit Function varies according to the operating mode. Timer RB output switch bit One-shot trigger control bit One-shot trigger polarity select bit Nothing is assigned. If necessary, set to 0. When read, the content is 0.
18.2.4
Timer RB Mode Register (TRBMR)
b6 -- 0 b5 TCK1 0 b4 TCK0 0 b3 TWRC 0 b2 -- 0 b1 TMOD1 0 b0 TMOD0 0 R/W R/W R/W
Address 010Bh Bit b7 Symbol TCKCUT After Reset 0 Bit b0 b1
b2 b3 b4 b5
b6 b7
Symbol Bit Name Function TMOD0 Timer RB operating mode select bit (1) b1 b0 0 0: Timer mode TMOD1 0 1: Programmable waveform generation mode 1 0: Programmable one-shot generation mode 1 1: Programmable wait one-shot generation mode -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. TWRC Timer RB write control bit (2) 0: Write to reload register and counter 1: Write to reload register only b5 b4 TCK0 Timer RB count source select bit (1) 0 0: f1 TCK1 0 1: f8 1 0: Timer RA underflow 1 1: f2 -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. TCKCUT Timer RB count source cutoff bit (1) 0: Provides count source 1: Cuts off count source
-- R/W R/W R/W
-- R/W
Notes: 1. Change bits TMOD1 and TMOD0; TCK1 and TCK0; and TCKCUT when both the TSTART and TCSTF bits in the TRBCR register set to 0 (count stops). 2. The TWRC bit can be set to either 0 or 1 in timer mode. In programmable waveform generation mode, programmable one-shot generation mode, or programmable wait one-shot generation mode, the TWRC bit must be set to 1 (write to reload register only).
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.2.5
Timer RB Prescaler Register (TRBPRE)
b6 -- 1 b5 -- 1 b4 -- 1 b3 -- 1 b2 -- 1 b1 -- 1 b0 -- 1 Setting Range 00h to FFh 00h to FFh 00h to FFh 00h to FFh R/W R/W R/W R/W R/W
Address 010Ch Bit b7 Symbol -- After Reset 1
Bit Mode b7 to b0 Timer mode Programmable waveform generation mode Programmable one-shot generation mode Programmable wait one-shot generation mode
Function Counts an internal count source or timer RA underflows
When the TSTOP bit in the TRBCR register is set to 1, the TRBPRE register is set to FFh.
18.2.6
Timer RB Secondary Register (TRBSC)
b6 -- 1 b5 -- 1 b4 -- 1 b3 -- 1 b2 -- 1 b1 -- 1 b0 -- 1 R/W -- W (2) -- W (2)
Address 010Dh Bit b7 Symbol -- After Reset 1
Bit Mode b7 to b0 Timer mode Programmable waveform generation mode Programmable one-shot generation mode Programmable wait one-shot generation mode
Function Setting Range Disabled 00h to FFh Counts timer RB prescaler underflows (1) 00h to FFh Disabled Counts timer RB prescaler underflows (one-shot width is counted) 00h to FFh 00h to FFh
Notes: 1. The values of registers TRBPR and TRBSC are reloaded to the counter alternately and counted. 2. The count value can be read out by reading the TRBPR register even when the secondary period is being counted.
When the TSTOP bit in the TRBCR register is set to 1, the TRBSC register is set to FFh. To write to the TRBSC register, perform the following steps. (1) Write the value to the TRBSC register. (2) Write the value to the TRBPR register. (If the value does not change, write the same value second time.)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.2.7
Timer RB Primary Register (TRBPR)
b6 -- 1 b5 -- 1 b4 -- 1 b3 -- 1 b2 -- 1 b1 -- 1 b0 -- 1 R/W R/W R/W R/W R/W
Address 010Eh Bit b7 Symbol -- After Reset 1
Bit Mode b7 to b0 Timer mode Programmable waveform generation mode Programmable one-shot generation mode Programmable wait one-shot generation mode
Function Setting Range Counts timer RB prescaler underflows 00h to FFh Counts timer RB prescaler underflows (1) 00h to FFh Counts timer RB prescaler underflows (one-shot width is counted) Counts timer RB prescaler underflows (wait period width is counted) 00h to FFh 00h to FFh
Note: 1. The values of registers TRBPR and TRBSC are reloaded to the counter alternately and counted.
When the TSTOP bit in the TRBCR register is set to 1, the TRBPR register is set to FFh.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.3
Timer Mode
In timer mode, a count source which is internally generated or timer RA underflows are counted (refer to Table 18.2 Timer Mode Specifications). Registers TRBOCR and TRBSC are not used in timer mode. Table 18.2 Timer Mode Specifications Specification f1, f2, f8, timer RA underflow * Decrement * When the timer underflows, it reloads the reload register contents before the count continues (when timer RB underflows, the contents of timer RB primary reload register is reloaded). 1/(n+1)(m+1) n: setting value in TRBPRE register, m: setting value in TRBPR register 1 (count starts) is written to the TSTART bit in the TRBCR register. * 0 (count stops) is written to the TSTART bit in the TRBCR register. * 1 (count forcibly stop) is written to the TSTOP bit in the TRBCR register. When timer RB underflows [timer RB interrupt]. Programmable I/O port Programmable I/O port or INT0 interrupt input The count value can be read out by reading registers TRBPR and TRBPRE. * When registers TRBPRE and TRBPR are written while the count is stopped, values are written to both the reload register and counter. * When registers TRBPRE and TRBPR are written to while count operation is in progress: If the TWRC bit in the TRBMR register is set to 0, the value is written to both the reload register and the counter. If the TWRC bit is set to 1, the value is written to the reload register only. (Refer to 18.3.2 Timer Write Control during Count Operation.)
Item Count sources Count operations
Divide ratio Count start condition Count stop conditions Interrupt request generation timing TRBO pin function INT0 pin function Read from timer Write to timer
18.3.1
Timer RB I/O Control Register (TRBIOC) in Timer Mode
b6 -- 0 b5 -- 0 b4 -- 0 b3 b2 INOSEG INOSTG 0 0 b1 TOCNT 0 b0 TOPL 0 R/W R/W R/W R/W R/W --
Address 010Ah Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol TOPL TOCNT INOSTG INOSEG -- -- -- --
Bit Name Function Timer RB output level select bit Set to 0 in timer mode. Timer RB output switch bit One-shot trigger control bit One-shot trigger polarity select bit Nothing is assigned. If necessary, set to 0. When read, the content is 0.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.3.2
Timer Write Control during Count Operation
Timer RB has a prescaler and a timer (which counts the prescaler underflows). The prescaler and timer each consist of a reload register and a counter. In timer mode, the TWRC bit in the TRBMR register can be used to select whether writing to the prescaler or timer during count operation is performed to both the reload register and counter or only to the reload register. However, values are transferred from the reload register to the counter of the prescaler in synchronization with the count source. In addition, values are transferred from the reload register to the counter of the timer in synchronization with prescaler underflows. Therefore, even if the TWRC bit is set for writing to both the reload register and counter, the counter value is not updated immediately after the WRITE instruction is executed. In addition, if the TWRC bit is set for writing to the reload register only, the synchronization of the writing will be shifted if the prescaler value changes. Figure 18.2 shows an Operating Example of Timer RB when Counter Value is Rewritten during Count Operation.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
When the TWRC bit is set to 0 (write to reload register and counter)
Set 01h to the TRBPRE register and 25h to the TRBPR register by a program.
Count source
After writing, the reload register is written with the first count source.
Reloads register of timer RB prescaler
Previous value
Reload with the second count source Reload on underflow
New value (01h)
Counter of timer RB prescaler
06h
05h
04h
01h
00h
01h
00h
01h
00h
01h
00h
After writing, the reload register is written on the first underflow.
Reloads register of timer RB
Previous value
New value (25h)
Reload on the second underflow
Counter of timer RB
03h
02h
25h
24h
IR bit in TRBIC register
0
The IR bit remains unchanged until underflow is generated by a new value.
When the TWRC bit is set to 1 (write to reload register only)
Set 01h to the TRBPRE register and 25h to the TRBPR register by a program.
Count source
After writing, the reload register is written with the first count source.
Reloads register of timer RB prescaler
Previous value
New value (01h)
Reload on underflow
Counter of timer RB prescaler
06h
05h
04h
03h
02h
01h
00h
01h
00h
01h
00h
01h
00h
01h
After writing, the reload register is written on the first underflow.
Reloads register of timer RB
Previous value
New value (25h)
Reload on underflow
Counter of timer RB
03h
02h
01h
00h
25h
IR bit in TRBIC register
0
Only the prescaler values are updated, extending the duration until timer RB underflow.
The above applies under the following conditions. Both bits TSTART and TCSTF in the TRBCR register are set to 1 (During count).
Figure 18.2
Operating Example of Timer RB when Counter Value is Rewritten during Count Operation Apr 01, 2008
REJ09B0458-0010 Rev.0.10 Page 208 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.4
Programmable Waveform Generation Mode
In programmable waveform generation mode, the signal output from the TRBO pin is inverted each time the counter underflows, while the values in registers TRBPR and TRBSC are counted alternately (refer to Table 18.3 Programmable Waveform Generation Mode Specifications). Counting starts by counting the setting value in the TRBPR register. The TRBOCR register is unused in this mode. Figure 18.3 shows an Operating Example of Timer RB in Programmable Waveform Generation Mode. Table 18.3 Programmable Waveform Generation Mode Specifications
Specification f1, f2, f8, timer RA underflow * Decrement * When the timer underflows, it reloads the contents of the primary reload and secondary reload registers alternately before the count continues. Primary period: (n+1)(m+1)/fi Secondary period: (n+1)(p+1)/fi Period: (n+1){(m+1)+(p+1)}/fi fi: Count source frequency n: Value set in TRBPRE register m: Value set in TRBPR register p: Value set in TRBSC register 1 (count start) is written to the TSTART bit in the TRBCR register. * 0 (count stop) is written to the TSTART bit in the TRBCR register. * 1 (count forcibly stop) is written to the TSTOP bit in the TRBCR register. In half a cycle of the count source, after timer RB underflows during the secondary period (at the same time as the TRBO output change) [timer RB interrupt] Programmable output port or pulse output Programmable I/O port or INT0 interrupt input The count value can be read out by reading registers TRBPR and TRBPRE (1). * When registers TRBPRE, TRBSC, and TRBPR are written while the count is stopped, values are written to both the reload register and counter. * When registers TRBPRE, TRBSC, and TRBPR are written to during count operation, values are written to the reload registers only. (2) * Output level select function The output level during primary and secondary periods is selected by the TOPL bit in the TRBIOC register. * TRBO pin output switch function Timer RB pulse output or P1_3 latch output is selected by the TOCNT bit in the TRBIOC register. (3)
Item Count sources Count operations
Width and period of output waveform
Count start condition Count stop conditions Interrupt request generation timing TRBO pin function INT0 pin function Read from timer Write to timer
Selectable functions
Notes: 1. Even when counting the secondary period, the TRBPR register may be read. 2. The set values are reflected in the waveform output beginning with the following primary period after writing to the TRBPR register. 3. The value written to the TOCNT bit is enabled by the following. * When counting starts. * When a timer RB interrupt request is generated. The contents after the TOCNT bit is changed are reflected from the output of the following primary period.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.4.1
Timer RB I/O Control Register (TRBIOC) in Programmable Waveform Generation Mode
b6 -- 0 b5 -- 0 b4 -- 0 b3 b2 INOSEG INOSTG 0 0 b1 TOCNT 0 b0 TOPL 0 R/W R/W
Address 010Ah Bit b7 Symbol -- After Reset 0 Bit b0 Symbol TOPL
b1 b2 b3 b4 b5 b6 b7
Function 0: Outputs "H" for primary period Outputs "L" for secondary period Outputs "L" when the timer is stopped 1: Outputs "L" for primary period Outputs "H" for secondary period Outputs "H" when the timer is stopped TOCNT Timer RB output switch bit 0: Outputs timer RB waveform 1: Outputs value in P1_3 port register INOSTG One-shot trigger control bit Set to 0 in programmable waveform generation mode. INOSEG One-shot trigger polarity select bit -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- --
Bit Name Timer RB output level select bit
R/W R/W R/W --
REJ09B0458-0010 Rev.0.10 Page 210 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.4.2
Operating Example
Set to 1 by program
TSTART bit in TRBCR register
1 0
Count source
Timer RB prescaler underflow signal
Timer RB secondary reloads
Timer RB primary reloads
Counter of timer RB
01h
00h
02h
01h
00h
01h
00h
02h
Set to 0 when interrupt request is acknowledged, or set by program.
IR bit in TRBIC register
1 0
Set to 0 by program
TOPL bit in TRBIO register
1 0
Waveform output starts Waveform output inverted Waveform output starts
1 TRBO pin output 0
Primary period Secondary period Primary period
Initial output is the same level as during secondary period.
The above applies under the following conditions. TRBPRE = 01h, TRBPR = 01h, TRBSC = 02h TRBIOC register TOCNT = 0 (timer RB waveform is output from the TRBO pin)
Figure 18.3
Operating Example of Timer RB in Programmable Waveform Generation Mode
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.5
Programmable One-shot Generation Mode
In programmable one-shot generation mode, a one-shot pulse is output from the TRBO pin by a program or an external trigger input (input to the INT0 pin) (refer to Table 18.4 Programmable One-Shot Generation Mode Specifications). When a trigger is generated, the timer starts operating from the point only once for a given period equal to the set value in the TRBPR register. The TRBSC register is not used in this mode. Figure 18.4 shows an Operating Example of Programmable One-Shot Generation Mode. Table 18.4 Programmable One-Shot Generation Mode Specifications Specification
f1, f2, f8, timer RA underflow * Decrement the setting value in the TRBPR register * When the timer underflows, it reloads the contents of the reload register before the count completes and the TOSSTF bit is set to 0 (one-shot stops). * When the count stops, the timer reloads the contents of the reload register before it stops. One-shot pulse (n+1)(m+1)/fi output time fi: Count source frequency, n: Setting value in TRBPRE register, m: Setting value in TRBPR register Count start conditions * The TSTART bit in the TRBCR register is set to 1 (count starts) and the next trigger is generated * Set the TOSST bit in the TRBOCR register to 1 (one-shot starts) * Input trigger to the INT0 pin Count stop conditions * When reloading completes after timer RB underflows during primary period * When the TOSSP bit in the TRBOCR register is set to 1 (one-shot stops) * When the TSTART bit in the TRBCR register is set to 0 (stops counting) * When the TSTOP bit in the TRBCR register is set to 1 (forcibly stops counting) Interrupt request In half a cycle of the count source, after the timer underflows (at the same time as generation timing the TRBO output ends) [timer RB interrupt] TRBO pin function Pulse output * When the INOSTG bit in the TRBIOC register is set to 0 (INT0 one-shot trigger INT0 pin functions disabled): programmable I/O port or INT0 interrupt input * When the INOSTG bit in the TRBIOC register is set to 1 (INT0 one-shot trigger enabled): external trigger (INT0 interrupt input) Read from timer The count value can be read out by reading registers TRBPR and TRBPRE. Write to timer * When registers TRBPRE and TRBPR are written while the count is stopped, values are written to both the reload register and counter. * When registers TRBPRE and TRBPR are written during the count, values are written to the reload register only (the data is transferred to the counter at the following reload) (1). Selectable functions * Output level select function The output level of the one-shot pulse waveform is selected by the TOPL bit in the TRBIOC register. * One-shot trigger select function Refer to 18.5.3 One-Shot Trigger Selection.
Note:
Item Count sources Count operations
1. The set value is reflected at the following one-shot pulse after writing to the TRBPR register.
REJ09B0458-0010 Rev.0.10 Page 212 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.5.1
Timer RB I/O Control Register (TRBIOC) in Programmable One-Shot Generation Mode
b6 -- 0 b5 -- 0 b4 -- 0 b3 b2 INOSEG INOSTG 0 0 b1 TOCNT 0 b0 TOPL 0 R/W R/W
Address 010Ah Bit b7 Symbol -- After Reset 0 Bit b0 Symbol TOPL
Bit Name Timer RB output level select bit
b1 b2 b3 b4 b5 b6 b7
TOCNT Timer RB output switch bit INOSTG One-shot trigger control bit (1)
Function 0: Outputs one-shot pulse "H" Outputs "L" when the timer is stopped 1: Outputs one-shot pulse "L" Outputs "H" when the timer is stopped Set to 0 in programmable one-shot generation mode.
R/W R/W R/W --
0: INT0 pin one-shot trigger disabled 1: INT0 pin one-shot trigger enabled INOSEG One-shot trigger polarity select bit (1) 0: Falling edge trigger 1: Rising edge trigger -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- --
Note: 1. Refer to 18.5.3 One-Shot Trigger Selection.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.5.2
Operating Example
Set to 1 by program
TSTART bit in TRBCR register
1 0
Set to 1 by program Set to 0 when counting ends Set to 1 by INT0 pin input trigger
TOSSTF bit in TRBOCR register
1 0
INT0 pin input
Count source
Timer RB prescaler underflow signal
Count starts Timer RB primary reloads Count starts Timer RB primary reloads
Counter of timer RB
01h
00h
01h
00h
01h
Set to 0 when interrupt request is acknowledged, or set by program
IR bit in TRBIC register
1 0
Set to 0 by program
TOPL bit in TRBIOC register
1 0
Waveform output starts Waveform output ends Waveform output starts Waveform output ends
1 TRBIO pin output 0
The above applies under the following conditions. TRBPRE = 01h, TRBPR = 01h TRBIOC register TOPL = 0, TOCNT = 0 INOSTG = 1 (INT0 one-shot trigger enabled) INOSEG = 1 (edge trigger at rising edge)
Figure 18.4
Operating Example of Programmable One-Shot Generation Mode
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R8C/32A Group
18. Timer RB
18.5.3
One-Shot Trigger Selection
In programmable one-shot generation mode and programmable wait one-shot generation mode, operation starts when a one-shot trigger is generated while the TCSTF bit in the TRBCR register is set to 1 (count starts). A one-shot trigger can be generated by either of the following causes: * 1 is written to the TOSST bit in the TRBOCR register by a program. * Trigger input from the INT0 pin. When a one-shot trigger occurs, the TOSSTF bit in the TRBOCR register is set to 1 (one-shot operation in progress) after one or two cycles of the count source have elapsed. Then, in programmable one-shot generation mode, count operation begins and one-shot waveform output starts. (In programmable wait one-shot generation mode, count operation starts for the wait period.) If a one-shot trigger occurs while the TOSSTF bit is set to 1, no retriggering occurs. To use trigger input from the INT0 pin, input the trigger after making the following settings: * Set the PD4_5 bit in the PD4 register to 0 (input port). * Select the INT0 digital filter with bits INT0F1 and INT0F0 in the INTF register. * Select both edges or one edge with the INT0PL bit in INTEN register. If one edge is selected, further select falling or rising edge with the INOSEG bit in TRBIOC register. * Set the INT0EN bit in the INTEN register to 0 (enabled). * After completing the above, set the INOSTG bit in the TRBIOC register to 1 (INT pin one-shot trigger enabled). Note the following points with regard to generating interrupt requests by trigger input from the INT0 pin. * Processing to handle the interrupts is required. Refer to 11. Interrupts, for details. * If one edge is selected, use the POL bit in the INT0IC register to select falling or rising edge. (The INOSEG bit in the TRBIOC register does not affect INT0 interrupts). * If a one-shot trigger occurs while the TOSSTF bit is set to 1, timer RB operation is not affected, but the value of the IR bit in the INT0IC register changes.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.6
Programmable Wait One-Shot Generation Mode
In programmable wait one-shot generation mode, a one-shot pulse is output from the TRBO pin by a program or an external trigger input (input to the INT0 pin) (refer to Table 18.5 Programmable Wait One-Shot Generation Mode Specifications). When a trigger is generated from that point, the timer outputs a pulse only once for a given length of time equal to the setting value in the TRBSC register after waiting for a given length of time equal to the setting value in the TRBPR register. Figure 18.5 shows an Operating Example of Programmable Wait One-Shot Generation Mode. Table 18.5 Programmable Wait One-Shot Generation Mode Specifications
Specification f1, f2, f8, timer RA underflow * Decrement the timer RB primary setting value. * When a count of the timer RB primary underflows, the timer reloads the contents of timer RB secondary before the count continues. * When a count of the timer RB secondary underflows, the timer reloads the contents of timer RB primary before the count completes and the TOSSTF bit is set to 0 (one-shot stops). * When the count stops, the timer reloads the contents of the reload register before it stops. (n+1)(m+1)/fi fi: Count source frequency n: Value set in the TRBPRE register, m Value set in the TRBPR register (n+1)(p+1)/fi fi: Count source frequency n: Value set in the TRBPRE register, p: Value set in the TRBSC register * The TSTART bit in the TRBCR register is set to 1 (count starts) and the next trigger is generated. * Set the TOSST bit in the TRBOCR register to 1 (one-shot starts). * Input trigger to the INT0 pin * When reloading completes after timer RB underflows during secondary period. * When the TOSSP bit in the TRBOCR register is set to 1 (one-shot stops). * When the TSTART bit in the TRBCR register is set to 0 (starts counting). * When the TSTOP bit in the TRBCR register is set to 1 (forcibly stops counting). In half a cycle of the count source after timer RB underflows during secondary period (complete at the same time as waveform output from the TRBO pin) [timer RB interrupt]. Pulse output * When the INOSTG bit in the TRBIOC register is set to 0 (INT0 one-shot trigger disabled): programmable I/O port or INT0 interrupt input * When the INOSTG bit in the TRBIOC register is set to 1 (INT0 one-shot trigger enabled): external trigger (INT0 interrupt input) The count value can be read out by reading registers TRBPR and TRBPRE. * When registers TRBPRE, TRBSC, and TRBPR are written while the count stops, values are written to both the reload register and counter. * When registers TRBPRE, TRBSC, and TRBPR are written to during count operation, values are written to the reload registers only. (1) * Output level select function The output level of the one-shot pulse waveform is selected by the TOPL bit in the TRBIOC register. * One-shot trigger select function Refer to 18.5.3 One-Shot Trigger Selection.
Item Count sources Count operations
Wait time
One-shot pulse output time
Count start conditions
Count stop conditions
Interrupt request generation timing TRBO pin function INT0 pin functions
Read from timer Write to timer
Selectable functions
Note: 1. The set value is reflected at the following one-shot pulse after writing to registers TRBSC and TRBPR.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.6.1
Timer RB I/O Control Register (TRBIOC) in Programmable Wait One-Shot Generation Mode
b6 -- 0 b5 -- 0 b4 -- 0 b3 b2 INOSEG INOSTG 0 0 b1 TOCNT 0 b0 TOPL 0 R/W R/W
Address 010Ah Bit b7 Symbol -- After Reset 0 Bit b0 Symbol TOPL
Bit Name Timer RB output level select bit
b1 b2 b3 b4 b5 b6 b7
TOCNT Timer RB output switch bit INOSTG One-shot trigger control bit (1)
Function 0: Outputs one-shot pulse "H" Outputs "L" when the timer stops or during wait 1: Outputs one-shot pulse "L" Outputs "H" when the timer stops or during wait Set to 0 in programmable wait one-shot generation mode.
R/W R/W R/W --
0: INT0 pin one-shot trigger disabled 1: INT0 pin one-shot trigger enabled INOSEG One-shot trigger polarity select bit (1) 0: Falling edge trigger 1: Rising edge trigger -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- --
Note: 1. Refer to 18.5.3 One-Shot Trigger Selection.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.6.2
Operating Example
Set to 1 by program
TSTART bit in TRBCR register
1 0
Set to 1 by setting 1 to TOSST bit in TRBOCR register, or INT0 pin input trigger. Set to 0 when counting ends
TOSSTF bit in TRBOCR register
1 0
INT0 pin input
Count source
Timer RB prescaler underflow signal
Count starts Timer RB secondary reloads Timer RB primary reloads
Counter of timer RB
01h
00h
04h
03h
02h
01h
00h
01h
Set to 0 when interrupt request is acknowledged, or set by program.
IR bit in TRBIC register
1 0
Set to 0 by program
TOPL bit in TRBIOC register
1 0
Wait starts Waveform output starts Waveform output ends
1 TRBIO pin output 0
Wait (primary period) One-shot pulse (secondary period)
The above applies under the following conditions. TRBPRE = 01h, TRBPR = 01h, TRBSC = 04h INOSTG = 1 (INT0 one-shot trigger enabled) INOSEG = 1 (edge trigger at rising edge)
Figure 18.5
Operating Example of Programmable Wait One-Shot Generation Mode
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.7
Notes on Timer RB
* Timer RB stops counting after a reset. Set the values in the timer RB and timer RB prescalers before the count
starts. * Even if the prescaler and timer RB is read out in 16-bit units, these registers are read 1 byte at a time by the MCU. Consequently, the timer value may be updated during the period when these two registers are being read. * In programmable one-shot generation mode and programmable wait one-shot generation mode, when setting the TSTART bit in the TRBCR register to 0, 0 (stops counting) or setting the TOSSP bit in the TRBOCR register to 1 (stops one-shot), the timer reloads the value of reload register and stops. Therefore, in programmable one-shot generation mode and programmable wait one-shot generation mode, read the timer count value before the timer stops. * The TCSTF bit remains 0 (count stops) for 1 to 2 cycles of the count source after setting the TSTART bit to 1 (count starts) while the count is stopped. During this time, do not access registers associated with timer RB (1) other than the TCSTF bit. Timer RB starts counting at the first valid edge of the count source after the TCSTF bit is set to 1 (during count). The TCSTF bit remains 1 for 1 to 2 cycles of the count source after setting the TSTART bit to 0 (count stops) while the count is in progress. Timer RB counting is stopped when the TCSTF bit is set to 0. During this time, do not access registers associated with timer RB (1) other than the TCSTF bit. Note: 1. Registers associated with timer RB: TRBCR, TRBOCR, TRBIOC, TRBMR, TRBPRE, TRBSC, and TRBPR.
* If the TSTOP bit in the TRBCR register is set to 1 during timer operation, timer RB stops immediately. * If 1 is written to the TOSST or TOSSP bit in the TRBOCR register, the value of the TOSSTF bit changes after
one or two cycles of the count source have elapsed. If the TOSSP bit is written to 1 during the period between when the TOSST bit is written to 1 and when the TOSSTF bit is set to 1, the TOSSTF bit may be set to either 0 or 1 depending on the content state. Likewise, if the TOSST bit is written to 1 during the period between when the TOSSP bit is written to 1 and when the TOSSTF bit is set to 0, the TOSSTF bit may be set to either 0 or 1.
18.7.1
Timer Mode
To write to registers TRBPRE and TRBPR during count operation (TCSTF bit in the TRBCR register is set to 1), note the following points: * When the TRBPRE register is written continuously, allow three or more cycles of the count source for each write interval. * When the TRBPR register is written continuously, allow three or more cycles of the prescaler underflow for each write interval.
18.7.2
Programmable Waveform Generation Mode
To write to registers TRBPRE and TRBPR during count operation (TCSTF bit in the TRBCR register is set to 1), note the following points: * When the TRBPRE register is written continuously, allow three or more cycles of the count source for each write interval. * When the TRBPR register is written continuously, allow three or more cycles of the prescaler underflow for each write interval.
REJ09B0458-0010 Rev.0.10 Page 219 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
18. Timer RB
18.7.3
Programmable One-shot Generation Mode
To write to registers TRBPRE and TRBPR during count operation (TCSTF bit in the TRBCR register is set to 1), note the following points: * When the TRBPRE register is written continuously during count operation (TCSTF bit is set to 1), allow three or more cycles of the count source for each write interval. * When the TRBPR register is written continuously during count operation (TCSTF bit is set to 1), allow three or more cycles of the prescaler underflow for each write interval.
18.7.4
Programmable Wait One-shot Generation Mode
To write to registers TRBPRE and TRBPR during count operation (TCSTF bit in the TRBCR register is set to 1), note the following points: * When the TRBPRE register is written continuously, allow three or more cycles of the count source for each write interval. * When the TRBPR register is written continuously, allow three or more cycles of the prescaler underflow for each write interval.
REJ09B0458-0010 Rev.0.10 Page 220 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19. Timer RC
Timer RC is a 16-bit timer with four I/O pins.
19.1
Overview
Timer RC uses either f1, fOCO40M or fOCO-F as its operation clock. Table 19.1 lists the Timer RC Operation Clock. Table 19.1 Timer RC Operation Clock
Condition Timer RC Operation Clock Count source is f1, f2, f4, f8, f32, or TRCCLK input (bits TCK2 to TCK0 in f1 TRCCR1 register are set to a value from 000b to 101b) Count source is fOCO40M (bits TCK2 to TCK0 in TRCCR1 register are set fOCO40M to 110b) Count source is fOCO-F (bits TCK2 to TCK0 in TRCCR1 register are set to fOCO-F 111b) Table 19.2 lists the Pin Configuration of Timer RC, and Figure 19.1 shows a Timer RC Block Diagram. Timer RC has three modes. * Timer mode - Input capture function The counter value is captured to a register, using an external signal as the trigger. - Output compare function Matches between the counter and register values are detected. (Pin output state changes when a match is detected.) The following two modes use the output compare function. * PWM mode Pulses of a given width are output continuously. * PWM2 mode A one-shot waveform or PWM waveform is output following the trigger after the wait time has elapsed. Input capture function, output compare function, and PWM mode settings may be specified independently for each pin. In PWM2 mode waveforms are output based on a combination of the counter or the register.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
f1, f2, f4, f8, f32, fOCO40M, fOCO-F
TRCMR register TRCCR1 register TRCIER register TRCSR register TRCIOR0 register TRCIOR1 register TRC register
Data bus
INT0 Count source select circuit TRCCLK TRCIOA/TRCTRG TRCIOB
Timer RC control circuit
TRCIOC TRCIOD
TRCGRA register TRCGRB register TRCGRC register TRCGRD register TRCCR2 register
TRCDF register TRCOER register TRCADCR register
Timer RC interrupt request
Figure 19.1
Timer RC Block Diagram
Table 19.2 Pin Name TRCIOA TRCIOB TRCIOC TRCIOD TRCCLK TRCTRG
Pin Configuration of Timer RC Assigned Pin P1_1 P1_2 P1_3 or P3_4 P1_0 or P3_5 P1_4 or P3_3 P1_1 Input Input External clock input PWM2 mode external trigger input I/O I/O Function Function differs according to the mode. Refer to descriptions of individual modes for details
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2
Registers
Table 19.3 lists the Registers Associated with Timer RC.
Table 19.3
Registers Associated with Timer RC
Mode Timer Address Symbol Input Output PWM Capture Compare Function Function 0008h MSTCR Valid Valid Valid 0120h TRCMR Valid Valid Valid 0121h TRCCR1 Valid Valid Valid
PWM2 Valid Valid Valid
Related Information
0122h 0123h 0124h
TRCIER Valid TRCSR Valid TRCIOR0 Valid
Valid Valid Valid
Valid Valid -
Valid Valid -
0125h
TRCIOR1
0126h 0127h 0128h 0129h 012Ah 012Bh 012Ch 012Dh 012Eh 012Fh 0130h 0131h 0132h 0133h 0181h 0182h 0183h -: Invalid
TRC
Valid
Valid Valid
Valid Valid
Valid Valid
19.2.1 Module Standby Control Register (MSTCR) 19.2.2 Timer RC Mode Register (TRCMR) Timer RC control register 1 19.2.3 Timer RC Control Register 1 (TRCCR1) 19.5.1 Timer RC Control Register 1 (TRCCR1) for Output Compare Function 19.6.1 Timer RC Control Register 1 (TRCCR1) in PWM Mode 19.7.1 Timer RC Control Register 1 (TRCCR1) in PWM2 Mode 19.2.4 Timer RC Interrupt Enable Register (TRCIER) 19.2.5 Timer RC Status Register (TRCSR) Timer RC I/O control register 0, timer RC I/O control register 1 19.2.6 Timer RC I/O Control Register 0 (TRCIOR0) 19.2.7 Timer RC I/O Control Register 1 (TRCIOR1) 19.4.1 Timer RC I/O Control Register 0 (TRCIOR0) for Input Capture Function 19.4.2 Timer RC I/O Control Register 1 (TRCIOR1) for Input Capture Function 19.5.2 Timer RC I/O Control Register 0 (TRCIOR0) for Output Compare Function 19.5.3 Timer RC I/O Control Register 1 (TRCIOR1) for Output Compare Function 19.2.8 Timer RC Counter (TRC) 19.2.9 Timer RC General Registers A, B, C, and D (TRCGRA, TRCGRB, TRCGRC, TRCGRD)
TRCGRA Valid TRCGRB TRCGRC TRCGRD TRCCR2 - TRCDF Valid TRCOER - TRCADCR - TRBRCSR Valid TRCPSR0 Valid TRCPSR1 Valid
- - Valid Valid Valid Valid Valid
- - Valid Valid Valid Valid Valid
Valid Valid Valid Valid Valid Valid Valid
19.2.10 Timer RC Control Register 2 (TRCCR2) 19.2.11 Timer RC Digital Filter Function Select Register (TRCDF) 19.2.12 Timer RC Output Master Enable Register (TRCOER) 19.2.13 Timer RC Trigger Control Register (TRCADCR) 19.2.14 Timer RC Pin Select Register (TRBRCSR) 19.2.15 Timer RC Pin Select Register 0 (TRCPSR0) 19.2.16 Timer RC Pin Select Register 1 (TRCPSR1)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2.1
Module Standby Control Register (MSTCR)
b6 -- 0 b5 b4 b3 MSTTRC MSTTRD MSTIIC 0 0 0 b2 -- 0 b1 -- 0 b0 -- 0 R/W --
Address 0008h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4
b5 b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- MSTIIC SSU, I2C bus standby bit 0: Active 1: Standby (1) MSTTRD Peripheral function power consumption Set to 1. reduce bit The power consumption of the peripheral functions can be reduced. MSTTRC Timer RC standby bit 0: Active 1: Standby (2) -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. --
R/W R/W
R/W --
Notes: 1. When the MSTIIC bit is set to 1 (standby), any access to the SSU or the I2C bus associated registers (addresses 0193h to 019Dh) is disabled. 2. When the MSTTRC bit is set to 1 (standby), any access to the timer RC associated registers (addresses 0120h to 0133h) is disabled.
19.2.2
Timer RC Mode Register (TRCMR)
b6 -- 1 b5 BFD 0 b4 BFC 0 b3 PWM2 1 b2 PWMD 0 b1 PWMC 0 b0 PWMB 0 R/W R/W R/W R/W R/W R/W R/W -- R/W
Address 0120h Bit b7 Symbol TSTART After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol PWMB
Function 0: Timer mode 1: PWM mode PWMC PWM mode of TRCIOC select bit (1) 0: Timer mode 1: PWM mode 0: Timer mode PWMD PWM mode of TRCIOD select bit (1) 1: PWM mode PWM2 PWM2 mode select bit 0: PWM 2 mode 1: Timer mode or PWM mode BFC TRCGRC register function select bit (2) 0: General register 1: Buffer register of TRCGRA register BFD TRCGRD register function select bit 0: General register 1: Buffer register of TRCGRB register -- Nothing is assigned. If necessary, set to 0. When read, the content is 1. TSTART TRC count start bit 0: Count stops 1: Count starts
Bit Name PWM mode of TRCIOB select bit (1)
Notes: 1. These bits are enabled when the PWM2 bit is set to 1 (timer mode or PWM mode). 2. Set the BFC bit to 0 (general register) in PWM2 mode.
For notes on PWM2 mode, refer to 19.9.6 TRCMR Register in PWM2 Mode.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2.3
Timer RC Control Register 1 (TRCCR1)
b6 TCK2 0 b5 TCK1 0 b4 TCK0 0 b3 TOD 0 b2 TOC 0 b1 TOB 0 b0 TOA 0 R/W R/W R/W R/W R/W R/W R/W R/W
Address 0121h Bit b7 Symbol CCLR After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 Symbol TOA TOB TOC TOD TCK0 TCK1 TCK2
Bit Name TRCIOA output level select bit (1) TRCIOB output level select bit (1) TRCIOC output level select bit (1) TRCIOD output level select bit (1) Count source select bit (1)
Function Function varies according to the operating mode (function).
b6 b5 b4
b7
CCLR
TRC counter clear select bit
0 0 0: f1 0 0 1: f2 0 1 0: f4 0 1 1: f8 1 0 0: f32 1 0 1: TRCCLK input rising edge 1 1 0: fOCO40M 1 1 1: fOCO-F (2) 0: Disable clear (free-running operation) 1: Clear TRC counter by input capture or by compare match in TRCGRA
R/W
Note: 1. Set to these bits when the TSTART bit in the TRCMR register is set to 0 (count stops). 2. To select fOCO-F, set it to the clock frequency higher than the CPU clock frequency.
19.2.4
Timer RC Interrupt Enable Register (TRCIER)
b6 -- 1 b5 -- 1 b4 -- 1 b3 IMIED 0 b2 IMIEC 0 b1 IMIEB 0 b0 IMIEA 0 R/W R/W R/W R/W R/W --
Address 0122h Bit b7 Symbol OVIE After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol IMIEA IMIEB IMIEC IMIED -- -- -- OVIE
Bit Name Function Input capture / compare match interrupt 0: Disable interrupt (IMIA) by the IMFA bit enable bit A 1: Enable interrupt (IMIA) by the IMFA bit Input capture / compare match interrupt 0: Disable interrupt (IMIB) by the IMFB bit enable bit B 1: Enable interrupt (IMIB) by the IMFB bit Input capture / compare match interrupt 0: Disable interrupt (IMIC) by the IMFC bit enable bit C 1: Enable interrupt (IMIC) by the IMFC bit Input capture / compare match interrupt 0: Disable interrupt (IMID) by the IMFD bit enable bit D 1: Enable interrupt (IMID) by the IMFD bit Nothing is assigned. If necessary, set to 0. When read, the content is 1.
Overflow interrupt enable bit
0: Disable interrupt (OVI) by the OVF bit 1: Enable interrupt (OVI) by the OVF bit
R/W
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2.5
Timer RC Status Register (TRCSR)
b6 -- 1 b5 -- 1 b4 -- 1 b3 IMFD 0 b2 IMFC 0 b1 IMFB 0 b0 IMFA 0 R/W R/W R/W R/W R/W --
Address 0123h Bit b7 Symbol OVF After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol IMFA IMFB IMFC IMFD -- -- -- OVF
Bit Name Input capture / compare match flag A Input capture / compare match flag B Input capture / compare match flag C Input capture / compare match flag D
Function [Source for setting this bit to 0] Write 0 after read (1). [Source for setting this bit to 1] Refer to Table 19.4 Source for Setting Bit of Each Flag to 1. Nothing is assigned. If necessary, set to 0. When read, the content is 1.
Overflow flag
[Source for setting this bit to 0] Write 0 after read (1). [Source for setting this bit to 1] Refer to Table 19.4 Source for Setting Bit of Each Flag to 1.
R/W
Note: 1. The writing results are as follows: *This bit is set to 0 when the read result is 1 and 0 is written to the same bit. *This bit remains unchanged even if the read result is 0 and 0 is written to the same bit. (This bit remains 1 even if it is set to 1 from 0 after reading, and writing 0.) *This bit remains unchanged if 1 is written to it.
Table 19.4
Bit Symbol IMFA IMFB IMFC IMFD OVF
Source for Setting Bit of Each Flag to 1
Timer Mode PWM Mode PWM2 Mode Input capture Function Output Compare Function When the values of the registers TRC and TRCGRA match. TRCIOA pin input edge (1) TRCIOB pin input edge (1) TRCIOC pin input edge
(1)
When the values of the registers TRC and TRCGRB match. When the values of the registers TRC and TRCGRC match. (2)
When the values of the registers TRC and TRCGRD match. (2) TRCIOD pin input edge (1) When the TRC register overflows.
Notes: 1. Edge selected by bits IOj1 to IOj0 (j = A, B, C, or D). 2. Includes the condition that bits BFC and BFD are set to 1 (buffer registers of registers TRCGRA and TRCGRB).
REJ09B0458-0010 Rev.0.10 Page 226 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2.6
Timer RC I/O Control Register 0 (TRCIOR0)
b6 IOB2 0 b5 IOB1 0 b4 IOB0 0 b3 IOA3 1 b2 IOA2 0 b1 IOA1 0 b0 IOA0 0 R/W R/W R/W R/W R/W R/W R/W R/W --
Address 0124h Bit b7 Symbol -- After Reset 1 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name IOA0 TRCGRA control bit IOA1 IOA2 TRCGRA mode select bit (1) IOA3 IOB0 IOB1 IOB2 --
Function Function varies according to the operating mode (function). 0: Output compare function 1: Input capture function TRCGRA input capture input switch 0: fOCO128 signal 1: TRCIOA pin input bit (3) TRCGRB control bit Function varies according to the operating mode (function). (2) 0: Output compare function TRCGRB mode select bit 1: Input capture function Nothing is assigned. If necessary, set to 0. When read, the content is 1.
Notes: 1. When the BFC bit in the TRCMR register is set to 1 (buffer register of TRCGRA register), set the IOC2 bit in the TRCIOR1 register to the same value as the IOA2 bit in the TRCIOR0 register. 2. When the BFD bit in the TRCMR register is set to 1 (buffer register of TRCGRB register), set the IOD2 bit in the TRCIOR1 register to the same value as the IOB2 bit in the TRCIOR0 register. 3. The IOA3 bit is enabled when the IOA2 bit is set to 1 (input capture function).
The TRCIOR0 register is enabled in timer mode. It is disabled in modes PWM and PWM2.
19.2.7
Timer RC I/O Control Register 1 (TRCIOR1)
b6 IOD2 0 b5 IOD1 0 b4 IOD0 0 b3 IOC3 1 b2 IOC2 0 b1 IOC1 0 b0 IOC0 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 0125h Bit b7 Symbol IOD3 After Reset 1 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name IOC0 TRCGRC control bit IOC1 IOC2 TRCGRC mode select bit (1) IOC3 IOD0 IOD1 IOD2 IOD3 TRCGRC register function select bit TRCGRD control bit TRCGRD mode select bit (2) TRCGRD register function select bit
Function Function varies according to the operating mode (function). 0: Output compare function 1: Input capture function 0: TRCIOA output register 1: General register or buffer register Function varies according to the operating mode (function). 0: Output compare function 1: Input capture function 0: TRCIOB output register 1: General register or buffer register
Notes: 1. When the BFC bit in the TRCMR register is set to 1 (buffer register of TRCGRA register), set the IOC2 bit in the TRCIOR1 register to the same value as the IOA2 bit in the TRCIOR0 register. 2. When the BFD bit in the TRCMR register is set to 1 (buffer register of TRCGRB register), set the IOD2 bit in the TRCIOR1 register to the same value as the IOB2 bit in the TRCIOR0 register.
The TRCIOR1 register is enabled in timer mode. It is disabled in modes PWM and PWM2.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2.8
Timer RC Counter (TRC)
b5 -- 0 b13 -- 0 b4 -- 0 b12 -- 0 b3 -- 0 b11 -- 0 b2 -- 0 b10 -- 0 b1 -- 0 b9 -- 0 b0 -- 0 b8 -- 0 Setting Range 0000h to FFFFh R/W R/W
Address 0127h to 0126h Bit b7 b6 Symbol -- -- After Reset 0 0 Bit Symbol After Reset b15 -- 0 b14 -- 0
Bit Function b15 to b0 Count a count source. Count operation is incremented. When an overflow occurs, the OVF bit in the TRCSR register is set to 1.
Access the TRC register in 16-bit units. Do not access it in 8-bit units.
19.2.9
Timer RC General Registers A, B, C, and D (TRCGRA, TRCGRB, TRCGRC, TRCGRD)
Address 0129h to 0128h (TRCGRA), 012Bh to 012Ah (TRCGRB), 012Dh to 012Ch (TRCGRC), 012Fh to 012Eh (TRCGRD) Bit b7 b6 b5 b4 b3 b2 b1 b0 Symbol -- -- -- -- -- -- -- -- After Reset 1 1 1 1 1 1 1 1 Bit Symbol After Reset b15 -- 1 b14 -- 1 b13 -- 1 b12 -- 1 b11 -- 1 b10 -- 1 b9 -- 1 b8 -- 1 R/W R/W
Bit Function b15 to b0 Function varies according to the operating mode.
Access registers TRCGRA to TRCGRD in 16-bit units. Do not access them in 8-bit units.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2.10 Timer RC Control Register 2 (TRCCR2)
Address 0130h Bit b7 Symbol TCEG1 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 TCEG0 0 b5 CSTP 0 b4 -- 1 b3 -- 1 b2 POLD 0 b1 POLC 0 b0 POLB 0 R/W R/W R/W R/W -- R/W
b6 b7
Symbol Bit Name Function POLB PWM mode output level control 0: TRCIOB output level selected as "L" active 1: TRCIOB output level selected as "H" active bit B (1) POLC PWM mode output level control 0: TRCIOC output level selected as "L" active 1: TRCIOC output level selected as "H" active bit C (1) POLD PWM mode output level control 0: TRCIOD output level selected as "L" active 1: TRCIOD output level selected as "H" active bit D (1) -- Nothing is assigned. If necessary, set to 0. When read, the content is 1. -- CSTP TRC count operation select bit (2) 0: Count continues at compare match with the TRCGRA register 1: Count stops at compare match with the TRCGRA register b7 b6 TCEG0 TRCTRG input edge select bit (3) 0 0: Disable the trigger input from the TRCTRG pin TCEG1 0 1: Rising edge selected 1 0: Falling edge selected 1 1: Both edges selected
R/W R/W
Notes: 1. Enabled when in PWM mode. 2. For notes on PWM2 mode, refer to 19.9.6 TRCMR Register in PWM2 Mode. 3. In timer mode and PWM mode these bits are disabled.
19.2.11 Timer RC Digital Filter Function Select Register (TRCDF)
Address 0131h Bit b7 Symbol DFCK1 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol DFA DFB DFC DFD DFTRG -- DFCK0 DFCK1 b6 DFCK0 0 b5 -- 0 b4 DFTRG 0 b3 DFD 0 b2 DFC 0 b1 DFB 0 b0 DFA 0 R/W R/W R/W R/W R/W R/W -- R/W R/W
Bit Name Function TRCIOA pin digital filter function select bit (1) 0: Function is not used TRCIOB pin digital filter function select bit (1) 1: Function is used TRCIOC pin digital filter function select bit (1) TRCIOD pin digital filter function select bit (1) TRCTRG pin digital filter function select bit (2) Nothing is assigned. If necessary, set to 0. When read, the content is 0. Clock select bits for digital filter function (1, 2) b7 b6 0 0: f32 0 1: f8 1 0: f1 1 1: Count source (clock selected by bits TCK2 to TCK0 in the TRCCR1 register)
Notes: 1. These bits are enabled for the input capture function. 2. These bits are enabled when in PWM2 mode and bits TCEG1 to TCEG0 in the TRCCR2 register are set to 01b, 10b, or 11b (TRCTRG trigger input enabled).
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2.12 Timer RC Output Master Enable Register (TRCOER)
Address 0132h Bit b7 Symbol PTO After Reset 0 Bit b0 b6 -- 1 b5 -- 1 b4 -- 1 b3 ED 1 b2 EC 1 b1 EB 1 b0 EA 1 R/W R/W
Symbol Bit Name EA TRCIOA output disable bit (1)
b1
EB
b2
EC
b3
ED
b4 b5 b6 b7
-- -- -- PTO
Function 0: Enable output 1: Disable output (The TRCIOA pin is used as a programmable I/O port.) (1) 0: Enable output TRCIOB output disable bit 1: Disable output (The TRCIOB pin is used as a programmable I/O port.) 0: Enable output TRCIOC output disable bit (1) 1: Disable output (The TRCIOC pin is used as a programmable I/O port.) (1) 0: Enable output TRCIOD output disable bit 1: Disable output (The TRCIOD pin is used as a programmable I/O port.) Nothing is assigned. If necessary, set to 0. When read, the content is 1.
R/W
R/W
R/W
--
INT0 of pulse output forced cutoff signal input enabled bit
0: Pulse output forced cutoff input disabled 1: Pulse output forced cutoff input enabled (Bits EA, EB, EC, and ED are set to 1 (disable output) when "L" is applied to the INT0 pin)
R/W
Note: 1. These bits are disabled for input pins set to the input capture function.
19.2.13 Timer RC Trigger Control Register (TRCADCR)
Address 0133h Bit b7 Symbol -- After Reset 0 Bit b0 b6 -- 0 b5 -- 0 b4 -- 0 b3 b2 b1 b0 ADTRGDE ADTRGCE ADTRGBE ADTRGAE 0 0 0 0 R/W R/W
b1
b2
b3
b4 b5 b6 b7
Function 0: A/D trigger disabled 1: A/D trigger generated at compare match with registers TRC and TRCGRA ADTRGBE A/D trigger B enable bit 0: A/D trigger disabled 1: A/D trigger generated at compare match with registers TRC and TRCGRB ADTRGCE A/D trigger C enable bit 0: A/D trigger disabled 1: A/D trigger generated at compare match with registers TRC and TRCGRC ADTRGDE A/D trigger D enable bit 0: A/D trigger disabled 1: A/D trigger generated at compare match with registers TRC and TRCGRD -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- --
Symbol Bit Name ADTRGAE A/D trigger A enable bit
R/W
R/W
R/W
--
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2.14 Timer RC Pin Select Register (TRBRCSR)
Address 0181h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 -- 0 b5 b4 TRCCLKSEL1 TRCCLKSEL0 0 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 -- 0 R/W R/W -- R/W R/W
b6 b7
Symbol Bit Name Function -- Reserved bits Set to 0. -- -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- b5 b4 TRCCLKSEL0 TRCCLK pin select bit 0 0: TRCCLK pin not used TRCCLKSEL1 0 1: P1_4 assigned 1 0: P3_3 assigned 1 1: Do not set. -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0.
R/W --
The TRBRCSR register selects which pin is assigned to the timer RC I/O. To use the I/O pin for timer RC, set this register. Set bits TRCCLKSEL0 and TRCCLKSEL1 before setting the timer RC associated registers. Also, do not change the setting values of bits TRCCLKSEL0 and TRCCLKSEL1 during timer RC operation.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.2.15 Timer RC Pin Select Register 0 (TRCPSR0)
Address 0182h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 b6 -- 0 b5 -- 0 b4 TRCIOBSEL0 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 TRCIOASEL0 0 R/W R/W R/W -- R/W R/W --
Symbol Bit Name TRCIOASEL0 TRCIOA/TRCTRG pin select bit
-- Reserved bits -- -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. TRCIOBSEL0 TRCIOB pin select bit 0: TRCIOB pin not used 1: P1_2 assigned -- Reserved bits Set to 0. -- -- Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Function 0: TRCIOA/TRCTRG pin not used 1: P1_1 assigned Set to 0.
The TRCPSR0 register selects which pin is assigned to the timer RC I/O. To use the I/O pin for timer RC, set this register. Set the TRCPSR0 register before setting the timer RC associated registers. Also, do not change the setting value in this register during timer RC operation.
19.2.16 Timer RC Pin Select Register 1 (TRCPSR1)
Address 0183h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b6 -- 0 b5 b4 b3 -- 0 b2 -- 0 b1 b0
TRCIODSEL1 TRCIODSEL0 0 0
TRCIOCSEL1 TRCIOCSEL0 0 0 Function R/W R/W R/W
b2 b3 b4 b5
b6 b7
0 0: TRCIOC pin not used 0 1: P1_3 assigned 1 0: P3_4 assigned 1 1: Do not set. -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. b5 b4 TRCIODSEL0 TRCIOD pin select bit 0 0: TRCIOD pin not used TRCIODSEL1 0 1: P1_0 assigned 1 0: P3_5 assigned 1 1: Do not set. -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Symbol Bit Name TRCIOCSEL0 TRCIOC pin select bit TRCIOCSEL1
b1 b0
R/W -- R/W R/W
R/W --
The TRCPSR1 register selects which pin is assigned to the timer RC I/O. To use the I/O pin for timer RC, set this register. Set the TRCPSR1 register before setting the timer RC associated registers. Also, do not change the setting value in this register during timer RC operation.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.3 19.3.1
Common Items for Multiple Modes Count Source
The method of selecting the count source is common to all modes. Table 19.5 lists the Count Source Selection, and Figure 19.2 shows a Count Source Block Diagram. Table 19.5 Count Source Selection
Count Source f1, f2, f4, f8, f32 fOCO40M fOCO-F
Selection Method Count source selected using bits TCK2 to TCK0 in TRCCR1 register FRA00 bit in FRA0 register set to 1 (high-speed on-chip oscillator on) Bits TCK2 to TCK0 in TRCCR1 register are set to 110b (fOCO40M) Bits TCK2 to TCK0 in TRCCR1 register are set to 111b (fOCO-F) External signal input Bits TCK2 to TCK0 in TRCCR1 register are set to 101b (count source is rising edge to TRCCLK pin of external clock) and the corresponding direction bit in the corresponding direction register is set is set to 0 (input mode)
f1 f2 f4 f8 f32 TRCCLK fOCO40M fOCO-F
TCK2 to TCK0 = 000b = 001b = 010b = 011b = 100b = 101b = 110b = 111b Count source TRC register
TCK2 to TCK0: Bits in TRCCR1 register
Figure 19.2
Count Source Block Diagram
The pulse width of the external clock input to the TRCCLK pin should be three cycles or more of the timer RC operation clock (see Table 19.1 Timer RC Operation Clock). To select fOCO40M or fOCO-F as the count source, set the FRA00 bit in the FRA0 register set to 1 (high-speed on-chip oscillator on), and then set bits TCK2 to TCK0 in the TRCCR1 register to 110b (fOCO40M) or 111b (fOCO-F).
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.3.2
Buffer Operation
Bits BFC and BFD in the TRCMR register are used to select the TRCGRC or TRCGRD register as the buffer register for the TRCGRA or TRCGRB register. * Buffer register for TRCGRA register: TRCGRC register * Buffer register for TRCGRB register: TRCGRD register Buffer operation differs depending on the mode. Table 19.6 lists the Buffer Operation in Each Mode, Figure 19.3 shows the Buffer Operation for Input Capture Function, and Figure 19.4 shows the Buffer Operation for Output Compare Function. Table 19.6 Buffer Operation in Each Mode Transfer Timing Input capture signal input Transfer Destination Register Contents of TRCGRA (TRCGRB) register are transferred to buffer register Contents of buffer register are transferred to TRCGRA (TRCGRB) register Contents of buffer register (TRCGRD) are transferred to TRCGRB register
Function, Mode Input capture function
Output compare function Compare match between TRC register and TRCGRA (TRCGRB) PWM mode register PWM2 mode * Compare match between TRC register and TRCGRA register * TRCTRG pin trigger input
TRCIOA input (input capture signal) TRCGRC register TRCGRA register TRC
TRCIOA input
TRC register
n-1
n Transfer
n+1
TRCGRA register
m Transfer
n
TRCGRC register (buffer)
m
The above applies under the following conditions: * The BFC bit in the TRCMR register is set to 1 (the TRCGRC register functions as the buffer register for the TRCGRA register). * Bits IOA2 to IOA0 in the TRCIOR0 register are set to 100b (input capture at the rising edge).
Figure 19.3
Buffer Operation for Input Capture Function
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Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
Compare match signal
TRCGRC register
TRCGRA register
Comparator
TRC
TRC register
m-1
m
m+1
TRCGRA register
m Transfer
n
TRCGRC register (buffer)
n
TRCIOA output
The above applies under the following conditions: * The BFC bit in the TRCMR register is set to 1 (the TRCGRC register functions as the buffer register for the TRCGRA register). * Bits IOA2 to IOA0 in the TRCIOR0 register are set to 001b ("L" output at compare match).
Figure 19.4
Buffer Operation for Output Compare Function
Make the following settings in timer mode. * To use the TRCGRC register as the buffer register for the TRCGRA register: Set the IOC2 bit in the TRCIOR1 register to the same value as the IOA2 bit in the TRCIOR0 register. * To use the TRCGRD register as the buffer register for the TRCGRB register: Set the IOD2 bit in the TRCIOR1 register to the same value as the IOB2 bit in the TRCIOR0 register. The output compare function, PWM mode, or PWM2 mode, and the TRCGRC or TRCGRD register is functioning as a buffer register, the IMFC bit or IMFD bit in the TRCSR register is set to 1 when a compare match with the TRC register occurs. The input capture function and the TRCGRC register or TRCGRD register is functioning as a buffer register, the IMFC bit or IMFD bit in the TRCSR register is set to 1 at the input edge of a signal input to the TRCIOC pin or TRCIOD pin.
REJ09B0458-0010 Rev.0.10 Page 235 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.3.3
Digital Filter
The input to TRCTRG or TRCIOj (j = A, B, C, or D) is sampled, and the level is considered to be determined when three matches occur. The digital filter function and sampling clock are selected using the TRCDF register. Figure 19.5 shows a Digital Filter Block Diagram.
TCK2 to TCK0 f1 f2 f4 f8 f32 TRCCLK fOCO40M fOCO-F = 001b = 010b = 011b Count source = 100b = 101b = 110b = 111b = 000b f32 f8 f1
DFCK1 to DFCK0 = 00b = 01b = 10b = 11b
IOA2 to IOA0 IOB2 to IOB0 IOC2 to IOC0 IOD2 to IOD0 (or TCEG1 to TCEG0) Sampling clock DFj (or DFTRG)
C TRCIOj input signal (or TRCTRG input signal) D Latch Timer RC operation clock f1 or fOCO40M C D Latch Q Q D
C Q Latch D
C Q Latch D
C Q Latch Match detect circuit
1
Edge detect circuit
0
Clock cycle selected by TCK2 to TCK0 (or DFCK1 to DFCK0)
Sampling clock
TRCIOj input signal (or TRCTRG input signal)
Three matches occur and a signal change is confirmed.
Input signal after passing through digital filter
Maximum signal transmission delay is five sampling clock pulses. If fewer than three matches occur, the matches are treated as noise and no transmission is performed. j = A, B, C, or D TCK0 to TCK2: Bits in TRCCR1 register DFTRG, DFCK0 to DFCK1, DFj: Bits in TRCDF register IOA0 to IOA2, IOB0 to IOB2: Bits in TRCIOR0 register IOC0 to IOC2, IOD0 to IOD2: Bits in TRCIOR1 register TCEG1 to TCEG0: Bits in TRCCR2 register
Figure 19.5
Digital Filter Block Diagram
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Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.3.4
Forced Cutoff of Pulse Output
When using the timer mode's output compare function, the PWM mode, or the PWM2 mode, pulse output from the TRCIOj (j = A, B, C, or D) output pin can be forcibly cut off and the TRCIOj pin set to function as a programmable I/O port by means of input to the INT0 pin. A pin used for output by the timer mode's output compare function, the PWM mode, or the PWM2 mode can be set to function as the timer RC output pin by setting the Ej bit in the TRCOER register to 0 (timer RC output enabled). If "L" is input to the INT0 pin while the PTO bit in the TRCOER register is set to 1 (pulse output forced cutoff signal input INT0 enabled), bits EA, EB, EC, and ED in the TRCOER register are all set to 1 (timer RC output disabled, TRCIOj output pin functions as the programmable I/O port). When one or two cycles of the timer RC operation clock after "L" input to the INT0 pin (refer to Table 19.1 Timer RC Operation Clock) has elapsed, the TRCIOj output pin becomes a programmable I/O port. Make the following settings to use this function. * Set the pin state following forced cutoff of pulse output (high impedance (input), "L" output, or "H" output). (Refer to 7. I/O Ports.) * Set the INT0EN bit to 1 (INT0 input enabled) and the INT0PL bit to 0 (one edge) in the INTEN register. * Set the PD4_5 bit in the PD4 register to 0 (input mode). * Select the INT0 digital filter by means of bits INT0F1 to INT0F0 in the INTF register. * Set the PTO bit in the TRCOER register to 1 (pulse output forced cutoff signal input INT0 enabled). The IR bit in the INT0IC register is set to 1 (interrupt request) in accordance with the setting of the POL bit and a change in the INT0 pin input (refer to 11.8 Notes on Interrupts). For details on interrupts, refer to 11. Interrupts.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
EA bit write value
EA bit DQ S Timer RC output data Port P1_1 output data Port P1_1 input data
INT0 input
PTO bit
TRCIOA
EB bit write value
EB bit DQ S Timer RC output data Port P1_2 output data Port P1_2 input data
TRCIOB
EC bit write value
EC bit DQ S Timer RC output data Port P3_4 output data Port P3_4 input data
TRCIOC
ED bit write value
ED bit DQ S Timer RC output data Port P3_5 output data Port P3_5 input data
TRCIOD
EA, EB, EC, ED, PTO: Bits in TRCOER register
Figure 19.6
Forced Cutoff of Pulse Output
REJ09B0458-0010 Rev.0.10 Page 238 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.4
Timer Mode (Input Capture Function)
This function measures the width or period of an external signal. An external signal input to the TRCIOj (j = A, B, C, or D) pin acts as a trigger for transferring the contents of the TRC register (counter) to the TRCGRj register (input capture). The input capture function, or any other mode or function, can be selected for each individual pin. The TRCGRA register can also select fOCO128 signal as input-capture trigger input. Table 19.7 lists the Specifications of Input Capture Function, Figure 19.7 shows a Block Diagram of Input Capture Function, Table 19.8 lists the Functions of TRCGRj Register when Using Input Capture Function, and Figure 19.8 shows an Operating Example of Input Capture Function. Table 19.7 Specifications of Input Capture Function Specification f1, f2, f4, f8, f32, fOCO40M, fOCO-F, or external signal (rising edge) input to TRCCLK pin Increment 1/fk x 65,536 fk: Count source frequency 1 (count starts) is written to the TSTART bit in the TRCMR register. 0 (count stops) is written to the TSTART bit in the TRCMR register. The TRC register retains a value before count stops. * Input capture (valid edge of TRCIOj input or fOCO128 signal edge) * The TRC register overflows. Programmable I/O port or input capture input (selectable individually for each pin) Programmable I/O port or INT0 interrupt input The count value can be read by reading TRC register. The TRC register can be written to. * Input capture input pin selection One or more of pins TRCIOA, TRCIOB, TRCIOC, and TRCIOD * Input capture input valid edge selection Rising edge, falling edge, or both rising and falling edges * Buffer operation (Refer to 19.3.2 Buffer Operation.) * Digital filter (Refer to 19.3.3 Digital Filter.) * Timing for setting the TRC register to 0000h Overflow or input capture * Input-capture trigger selected fOCO128 can be selected for input-capture trigger input of the TRCGRA register.
Item Count source Count operation Count period Count start condition Count stop condition Interrupt request generation timing TRCIOA, TRCIOB, TRCIOC, and TRCIOD pin functions INT0 pin function Read from timer Write to timer Select functions
j = A, B, C, or D
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
fOCO-S or fOCO-F
Divided by 128
fOCO128
IOA3 = 0
Input capture signal (3) TRCIOA Edge selection
IOA3 = 1 (Note 1)
TRCGRA register
TRC register
TRCGRC register Edge selection
TRCIOC
Input capture signal
TRCIOB
Edge selection
Input capture signal
(Note 2)
TRCGRB register
TRCGRD register TRCIOD Edge selection
Input capture signal
IOA3: Bit in TRCIOR0 register Notes: 1. The BFC bit in the TRCMR register is set to 1 (TRCGRC register functions as the buffer register for the TRCGRA register) 2. The BFD bit in the TRCMR register is set to 1 (TRCGRD register functions as the buffer register for the TRCGRB register) 3. The trigger input of the TRCGRA register can select the TRCIOA pin input or fOCO128 signal.
Figure 19.7
Block Diagram of Input Capture Function
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.4.1
Timer RC I/O Control Register 0 (TRCIOR0) for Input Capture Function
b6 IOB2 0 b5 IOB1 0 b4 IOB0 0 b3 IOA3 1 b2 IOA2 0 b1 IOA1 0 Function
b1 b0
Address 0124h Bit b7 Symbol -- After Reset 1 Bit b0 b1
b0 IOA0 0 R/W R/W R/W
Symbol Bit Name IOA0 TRCGRA control bit IOA1
b2 b3 b4 b5
IOA2 IOA3 IOB0 IOB1
b6 b7
IOB2 --
0 0: Input capture to the TRCGRA register at the rising edge 0 1: Input capture to the TRCGRA register at the falling edge 1 0: Input capture to the TRCGRA register at both edges 1 1: Do not set. Set to 1 (input capture) in the input capture function. TRCGRA mode select bit (1) TRCGRA input capture input switch 0: fOCO128 signal 1: TRCIOA pin input bit (3) b5 b4 TRCGRB control bit 0 0: Input capture to the TRCGRB register at the rising edge 0 1: Input capture to the TRCGRB register at the falling edge 1 0: Input capture to the TRCGRB register at both edges 1 1: Do not set. Set to 1 (input capture) in the input capture function. TRCGRB mode select bit (2) Nothing is assigned. If necessary, set to 0. When read, the content is 1.
R/W R/W R/W R/W
R/W --
Notes: 1. When the BFC bit in the TRCMR register is set to 1 (buffer register of TRCGRA register), set the IOC2 bit in the TRCIOR1 register to the same value as the IOA2 bit in the TRCIOR0 register. 2. When the BFD bit in the TRCMR register is set to 1 (buffer register of TRCGRB register), set the IOD2 bit in the TRCIOR1 register to the same value as the IOB2 bit in the TRCIOR0 register. 3. The IOA3 bit is enabled when the IOA2 bit is set to 1 (input capture function).
REJ09B0458-0010 Rev.0.10 Page 241 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.4.2
Timer RC I/O Control Register 1 (TRCIOR1) for Input Capture Function
b6 IOD2 0 b5 IOD1 0 b4 IOD0 0 b3 IOC3 1 b2 IOC2 0 b1 IOC1 0 Function
b1 b0
Address 0125h Bit b7 Symbol IOD3 After Reset 1 Bit b0 b1
b0 IOC0 0 R/W R/W R/W
Symbol Bit Name IOC0 TRCGRC control bit IOC1
b2 b3 b4 b5
IOC2 IOC3 IOD0 IOD1
TRCGRC mode select bit (1) TRCGRC register function select bit TRCGRD control bit
0 0: Input capture to the TRCGRC register at the rising edge 0 1: Input capture to the TRCGRC register at the falling edge 1 0: Input capture to the TRCGRC register at both edges 1 1: Do not set. Set to 1 (input capture) in the input capture function. Set to 1.
b5 b4
R/W R/W R/W R/W
b6 b7
IOD2 IOD3
TRCGRD mode select bit (2) TRCGRD register function select bit
0 0: Input capture to the TRCGRD register at the rising edge 0 1: Input capture to the TRCGRD register at the falling edge 1 0: Input capture to the TRCGRD register at both edges 1 1: Do not set. Set to 1 (input capture) in the input capture function. Set to 1.
R/W R/W
Notes: 1. When the BFC bit in the TRCMR register is set to 1 (buffer register of TRCGRA register), set the IOC2 bit in the TRCIOR1 register to the same value as the IOA2 bit in the TRCIOR0 register. 2. When the BFD bit in the TRCMR register is set to 1 (buffer register of TRCGRB register), set the IOD2 bit in the TRCIOR1 register to the same value as the IOB2 bit in the TRCIOR0 register.
Table 19.8 Register TRCGRA TRCGRB TRCGRC TRCGRD TRCGRC TRCGRD
Functions of TRCGRj Register when Using Input Capture Function Setting - BFC = 0 BFD = 0 BFC = 1 BFD = 1 Input Capture Input Pin General register. Can be used to read the TRC register value TRCIOA at input capture. TRCIOB General register. Can be used to read the TRC register value TRCIOC at input capture. TRCIOD Buffer registers. Can be used to hold transferred value from TRCIOA the general register. (Refer to 19.3.2 Buffer Operation.) TRCIOB Register Function
j = A, B, C, or D BFC, BFD: Bits in TRCMR register
REJ09B0458-0010 Rev.0.10 Page 242 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.4.3
Operating Example
TRCCLK input count source TRC register count value FFFFh 0009h
0006h
0000h TSTART bit in TRCMR register 1 0 65536 TRCIOA input
TRCGRA register Transfer TRCGRC register
0006h
0009h Transfer 0006h
IMFA bit in TRCSR register OVF bit in TRCSR register
1 0 1 0 Set to 0 by a program
The above applies under the following conditions: * The CCLR bit in the TRCCR1 register is set to 1 (Clear TRC counter by input capture). * Bits TCK2 to TCK0 in the TRCCR1 register are set to 101b (the count source is TRCCLK input). * Bits IOA2 to IOA0 in the TRCIORA register are set to 101b (input capture at the falling edge of the TRCIOA input). * The BFC bit in the TRCMR register is set to 1 (the TRCGRC register functions as the buffer register for the TRCGRA register).
Figure 19.8
Operating Example of Input Capture Function
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.5
Timer Mode (Output Compare Function)
This function detects when the contents of the TRC register (counter) and the TRCGRj register (j = A, B, C, or D) match (compare match). When a match occurs a signal is output from the TRCIOj pin at a given level. The output compare function, or other mode or function, can be selected for each individual pin. Table 19.9 lists the Specifications of Output Compare Function, Figure 19.9 shows a Block Diagram of Output Compare Function, Table 19.10 lists the Functions of TRCGRj Register when Using Output Compare Function, and Figure 19.10 shows an Operating Example of Output Compare Function. Table 19.9
Count source Count operation Count period
Specifications of Output Compare Function
Item Specification f1, f2, f4, f8, f32, fOCO40M, fOCO-F, or external signal (rising edge) input to TRCCLK pin Increment * The CCLR bit in the TRCCR1 register is set to 0 (free running operation): 1/fk x 65,536 fk: Count source frequency * The CCLR bit in the TRCCR1 register is set to 1 (TRC register set to 0000h at TRCGRA compare match): 1/fk x (n + 1) n: TRCGRA register setting value Compare match 1 (count starts) is written to the TSTART bit in the TRCMR register. * When the CSEL bit in the TRCCR2 register is set to 0 (count continues after compare match with TRCGRA). 0 (count stops) is written to the TSTART bit in the TRCMR register. The output compare output pin retains output level before count stops, the TRC register retains a value before count stops. * When the CSEL bit in the TRCCR2 register is set to 1 (count stops at compare match with TRCGRA register). The count stops at the compare match with the TRCGRA register. The outputcompare output pin retains the level after the output is changed by the compare match. * Compare match (contents of registers TRC and TRCGRj match) * The TRC register overflows. Programmable I/O port or output compare output (Selectable individually for each pin) Programmable I/O port, pulse output forced cutoff signal input, or INT0 interrupt input The count value can be read by reading the TRC register. The TRC register can be written to. * Output compare output pin selection One or more of pins TRCIOA, TRCIOB, TRCIOC, and TRCIOD * Compare match output level selection "L" output, "H" output, or toggle output * Initial output level selection Sets output level for period from count start to compare match * Timing for setting the TRC register to 0000h Overflow or compare match with the TRCGRA register * Buffer operation (Refer to 19.3.2 Buffer Operation.) * Pulse output forced cutoff signal input (Refer to 19.3.4 Forced Cutoff of Pulse Output.) * Can be used as an internal timer by disabling timer RC output * Changing output pins for registers TRCGRC and TRCGRD TRCGRC can be used for output control of the TRCIOA pin and TRCGRD can be used for output control of the TRCIOB pin. * A/D trigger generation
Waveform output timing Count start condition Count stop condition
Interrupt request generation timing TRCIOA, TRCIOB, TRCIOC, and TRCIOD pin functions INT0 pin function Read from timer Write to timer Select functions
j = A, B, C, or D
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
TRC Output control Compare match signal Comparator TRCGRA
TRCIOA
TRCIOC
Output control
Compare match signal Comparator TRCGRC
TRCIOB
Output control
Compare match signal Comparator TRCGRB
TRCIOD
Output control
Compare match signal Comparator TRCGRD
Figure 19.9
Block Diagram of Output Compare Function
REJ09B0458-0010 Rev.0.10 Page 245 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.5.1
Timer RC Control Register 1 (TRCCR1) for Output Compare Function
b6 TCK2 0 b5 TCK1 0 b4 TCK0 0 b3 TOD 0 b2 TOC 0 b1 TOB 0 b0 TOA 0 R/W R/W R/W R/W R/W R/W R/W R/W
Address 0121h Bit b7 Symbol CCLR After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 Symbol TOA TOB TOC TOD TCK0 TCK1 TCK2
b7
CCLR
Bit Name Function TRCIOA output level select bit (1, 2) 0: Initial output "L" TRCIOB output level select bit (1, 2) 1: Initial output "H" TRCIOC output level select bit (1, 2) TRCIOD output level select bit (1, 2) b6 b5 b4 Count source select bit (1) 0 0 0: f1 0 0 1: f2 0 1 0: f4 0 1 1: f8 1 0 0: f32 1 0 1: TRCCLK input rising edge 1 1 0: fOCO40M 1 1 1: fOCO-F (3) TRC counter clear select bit 0: Disable clear (free-running operation) 1: Clear by compare match in the TRCGRA register
R/W
Notes: 1. Set to these bits when the TSTART bit in the TRCMR register is set to 0 (count stops). 2. If the pin function is set for waveform output (refer to 7.5 Port Settings), the initial output level is output when the TRCCR1 register is set. 3. To select fOCO-F, set it to the clock frequency higher than the CPU clock frequency.
Table 19.10 Register TRCGRA TRCGRB TRCGRC TRCGRD TRCGRC TRCGRD
Functions of TRCGRj Register when Using Output Compare Function Setting - BFC = 0 BFD = 0 BFC = 1 BFD = 1 Register Function General register. Write a compare value to one of these registers. General register. Write a compare value to one of these registers. Buffer register. Write the next compare value to one of these registers. (Refer to 19.3.2 Buffer Operation.) Output Compare Output Pin TRCIOA TRCIOB TRCIOC TRCIOD TRCIOA TRCIOB
j = A, B, C, or D BFC, BFD: Bits in TRCMR register
REJ09B0458-0010 Rev.0.10 Page 246 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.5.2
Timer RC I/O Control Register 0 (TRCIOR0) for Output Compare Function
b6 IOB2 0 b5 IOB1 0 b4 IOB0 0 b3 IOA3 1 b2 IOA2 0 b1 IOA1 0 Function
b1 b0
Address 0124h Bit b7 Symbol -- After Reset 1 Bit b0 b1
b0 IOA0 0 R/W R/W R/W
Symbol Bit Name IOA0 TRCGRA control bit IOA1
b2 b3 b4 b5
IOA2 IOA3 IOB0 IOB1
TRCGRA mode select bit (1) TRCGRA input capture input switch bit TRCGRB control bit
0 0: Disable pin output by compare match (TRCIOA pin functions as the programmable I/O port) 0 1: "L" output by compare match in the TRCGRA register 1 0: "H" output by compare match in the TRCGRA register 1 1: Toggle output by compare match in the TRCGRA register Set to 0 (output compare) in the output compare function. Set to 1.
b5 b4
R/W R/W R/W R/W
b6 b7
IOB2 --
0 0: Disable pin output by compare match (TRCIOB pin functions as the programmable I/O port) 0 1: "L" output by compare match in the TRCGRB register 1 0: "H" output by compare match in the TRCGRB register 1 1: Toggle output by compare match in the TRCGRB register (2) Set to 0 (output compare) in the output compare TRCGRB mode select bit function. Nothing is assigned. If necessary, set to 0. When read, the content is 1.
R/W --
Notes: 1. When the BFC bit in the TRCMR register is set to 1 (buffer register of TRCGRA register), set the IOC2 bit in theTRCIOR1 register to the same value as the IOA2 bit in the TRCIOR0 register. 2. When the BFD bit in the TRCMR register is set to 1 (buffer register of TRCGRB register), set the IOD2 bit in the TRCIOR1 register to the same value as the IOB2 bit in the TRCIOR0 register.
REJ09B0458-0010 Rev.0.10 Page 247 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.5.3
Timer RC I/O Control Register 1 (TRCIOR1) for Output Compare Function
b6 IOD2 0 b5 IOD1 0 b4 IOD0 0 b3 IOC3 1 b2 IOC2 0 b1 IOC1 0 Function
b1 b0
Address 0125h Bit b7 Symbol IOD3 After Reset 1 Bit b0 b1
b0 IOC0 0 R/W R/W R/W
Symbol Bit Name IOC0 TRCGRC control bit IOC1
b2 b3 b4 b5
IOC2 IOC3 IOD0 IOD1
TRCGRC mode select bit (1) TRCGRC register function select bit TRCGRD control bit
0 0: Disable pin output by compare match 0 1: "L" output by compare match in the TRCGRC register 1 0: "H" output by compare match in the TRCGRC register 1 1: Toggle output by compare match in the TRCGRC register Set to 0 (output compare) in the output compare function. 0: TRCIOA output register 1: General register or buffer register
b5 b4
R/W R/W R/W R/W
b6 b7
IOD2 IOD3
TRCGRD mode select bit (2) TRCGRD register function select bit
0 0: Disable pin output by compare match 0 1: "L" output by compare match in the TRCGRD register 1 0: "H" output by compare match in the TRCGRD register 1 1: Toggle output by compare match in the TRCGRD register Set to 0 (output compare) in the output compare function. 0: TRCIOB output register 1: General register or buffer register
R/W R/W
Notes: 1. When the BFC bit in the TRCMR register is set to 1 (buffer register of TRCGRA register), set the IOC2 bit in theTRCIOR1 register to the same value as the IOA2 bit in the TRCIOR0 register. 2. When the BFD bit in the TRCMR register is set to 1 (buffer register of TRCGRB register), set the IOD2 bit in theTRCIOR1 register to the same value as the IOB2 bit in the TRCIOR0 register.
REJ09B0458-0010 Rev.0.10 Page 248 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.5.4
Operating Example
Count source
TRC register value m
n
p Count restarts Count stops TSTART bit in TRCMR register 1 0 m+1 m+1 Output level held TRCIOA output Output inverted at compare match Initial output "L" IMFA bit in TRCSR register 1 0 Set to 0 by a program n+1 TRCIOB output Output level held
"H" output at compare match Initial output "L" 1 0 Set to 0 by a program P+1 "L" output at compare match Output level held
IMFB bit in TRCSR register
TRCIOC output Initial output "H"
IMFC bit in TRCSR register
1 0 Set to 0 by a program
m: TRCGRA register setting value n: TRCGRB register setting value p: TRCGRC register setting value The above applies under the following conditions: * Bits BFC and BFD in the TRCMR register are set to 0 (TRCGRC and TRCGRD do not operate as buffers). * Bits EA, EB, and EC in the TRCOER register are set to 0 (output from TRCIOA, TRCIOB, and TRCIOC enabled). * The CCLR bit in the TRCCR1 register is set to 1 (set the TRC register to 0000h by TRCGRA compare match). * In the TRCCR1 register, bits TOA and TOB are set to 0 ("L" initial output until compare match) and the TOC bit is set to 1 ("H" initial output until compare match). * Bits IOA2 to IOA0 in the TRCIOR0 register are set to 011b (TRCIOA output inverted at TRCGRA compare match). * Bits IOB2 to IOB0 in the TRCIOR0 register are set to 010b ("H" TRCIOB output at TRCGRB compare match). * Bits IOC2 to IOC2 in the TRCIOR1 register are set to 001b ("L" TRCIOC output at TRCGRC compare match). * The CSEL bit in the TRCCR2 register is set to 0 (TRC count continues after TRCGRA compare match).
Figure 19.10
Operating Example of Output Compare Function
REJ09B0458-0010 Rev.0.10 Page 249 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.5.5
Changing Output Pins in Registers TRCGRC and TRCGRD
The TRCGRC register can be used for output control of the TRCIOA pin, and the TRCGRD register can be used for output control of the TRCIOB pin. Therefore, each pin output can be controlled as follows: * TRCIOA output is controlled by the values in registers TRCGRA and TRCGRC. * TRCIOB output is controlled by the values in registers TRCGRB and TRCGRD. Change output pins in registers TRCGRC and TRCGRD as follows: * Set the IOC3 bit in the TRCIOR1 register to 0 (TRCIOA output register) and set the IOD3 bit to 0 (TRCIOB output register). * Set bits BFC and BFD in the TRCMR register to 0 (general register). * Set different values in registers TRCGRC and TRCGRA. Also, set different values in registers TRCGRD and TRCGRB. Figure 19.12 shows an Operating Example When TRCGRC Register is Used for Output Control of TRCIOA Pin and TRCGRD Register is Used for Output Control of TRCIOB Pin.
TRC Compare match signal Output control
TRCIOA
IOC3 = 0 in TRCIOR1 register
Comparator
TRCGRA
Compare match signal
TRCIOC
Output control
IOC3 = 1
Comparator Compare match signal
TRCGRC
TRCIOB
Output control
IOD3 = 0 in TRCIOR1 register
Comparator
TRCGRB
Compare match signal
TRCIOD
Output control
IOD3 = 1
Comparator
TRCGRD
Figure 19.11
Changing Output Pins in Registers TRCGRC and TRCGRD
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
Count source Value in TRC register FFFFh m
n
p
q
0000h m+1 n+1 p+1 q+1 Initial output "L" TRCIOA output Output inverted by compare match IMFA bit in TRCSR register 1 0 Set to 0 by a program IMFC bit in TRCSR register 1 0 Set to 0 by a program p-q m-n
Initial output "L" TRCIOB output Output inverted by compare match IMFB bit in TRCSR register 1 0
Set to 0 by a program IMFD bit in TRCSR register 1 0
Set to 0 by a program
i = 0 or 1
m: Value set in TRCGRA register n: Value set in TRCGRC register p: Value set in TRCGRB register q: Value set in TRCGRD register
The above applies under the following conditions: Bits BFC and BFD in the TRCMR register are set to 0 (registers TRCGRC and TRCGRD are not used as buffer register). Bits EA and EB in the TRCOER register are set to 0 (enable TRCIOA and TRCIOB pin outputs). The CCLR bit in the TRCCR1 register are set to 1 (set the TRC register to 0000h by compare match in the TRCGRA register). Bits TOA and TOB in the TRCCR1 register are set to 0 (initial output "L" to compare match). Bits IOA2 to IOA0 in the TRCIOR0 register are set to 011b (TRCIOA output inverted at TRCGRA register compare match). Bits IOB2 to IOB0 in the TRCIOR0 register are set to 011b (TRCIOB output inverted at TRCGRB register compare match). Bits IOC2 to IOC0 in the TRCIOR1 register are set to 011b (TRCIOA output inverted at TRCGRC register compare match). The IOC3 bit in the TRCIOR1 register are set to 0 (TRCIOA output register). Bits IOD2 to IOD0 in the TRCIOR1 register are set to 011b (TRCIOB output inverted at TRCGRD register compare match). The IOD3 bit in the TRCIOR1 register are set to 0 (TRCIOB output register). The CSEL bit in the TRCCR2 register are set to 0 (TRC continues counting after compare match).
Figure 19.12
Operating Example When TRCGRC Register is Used for Output Control of TRCIOA Pin and TRCGRD Register is Used for Output Control of TRCIOB Pin
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.6
PWM Mode
This mode outputs PWM waveforms. A maximum of three PWM waveforms with the same period are output. The PWM mode, or the timer mode, can be selected for each individual pin. (However, since the TRCGRA register is used when using any pin for the PWM mode, the TRCGRA register cannot be used for the timer mode.) Table 19.11 lists the Specifications of PWM Mode, Figure 19.13 shows a PWM Mode Block Diagram, Table 19.12 lists the Functions of TRCGRj Register in PWM Mode, and Figures 19.14 and 19.15 show Operating Examples of PWM Mode. Table 19.11 Count source Count operation PWM waveform Specifications of PWM Mode Item Specification f1, f2, f4, f8, f32, fOCO40M, fOCO-F, or external signal (rising edge) input to TRCCLK pin Increment PWM period: 1/fk x (m + 1) Active level width: 1/fk x (m - n) Inactive width: 1/fk x (n + 1) fk: Count source frequency m: TRCGRA register setting value n: TRCGRj register setting value
m+1
n+1
m-n
("L" is active level)
Count start condition Count stop condition
Interrupt request generation timing TRCIOA pin function TRCIOB, TRCIOC, and TRCIOD pin functions INT0 pin function Read from timer Write to timer Select functions
1 (count starts) is written to the TSTART bit in the TRCMR register. * When the CSEL bit in the TRCCR2 register is set to 0 (count continues after compare match with TRCGRA). 0 (count stops) is written to the TSTART bit in the TRCMR register. PWM output pin retains output level before count stops, TRC register retains value before count stops. * When the CSEL bit in the TRCCR2 register is set to 1 (count stops at compare match with TRCGRA register). The count stops at the compare match with the TRCGRA register. The PWM output pin retains the level after the output is changed by the compare match. * Compare match (contents of registers TRC and TRCGRh match) * The TRC register overflows. Programmable I/O port Programmable I/O port or PWM output (selectable individually for each pin) Programmable I/O port, pulse output forced cutoff signal input, or INT0 interrupt input The count value can be read by reading the TRC register. The TRC register can be written to. * One to three pins selectable as PWM output pins One or more of pins TRCIOB, TRCIOC, and TRCIOD * Active level selectable for each pin * Initial level selectable for each pin * Buffer operation (Refer to 19.3.2 Buffer Operation.) * Pulse output forced cutoff signal input (Refer to 19.3.4 Forced Cutoff of Pulse Output.) * A/D trigger generation
j = B, C, or D h = A, B, C, or D
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
TRC Compare match signal
TRCIOB
Compare match signal
Comparator
TRCGRA
(Note 1)
TRCIOC
Output control
Comparator Compare match signal
TRCGRB
TRCIOD
Compare match signal
Comparator
TRCGRC
(Note 2)
Comparator
TRCGRD
Notes: 1. The BFC bit in the TRCMR register is set to 1 (TRCGRC register functions as the buffer register for the TRCGRA register) 2. The BFD bit in the TRCMR register is set to 1 (TRCGRD register functions as the buffer register for the TRCGRB register)
Figure 19.13
PWM Mode Block Diagram
REJ09B0458-0010 Rev.0.10 Page 253 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.6.1
Timer RC Control Register 1 (TRCCR1) in PWM Mode
b6 TCK2 0 b5 TCK1 0 b4 TCK0 0 b3 TOD 0 b2 TOC 0 b1 TOB 0 b0 TOA 0 R/W R/W R/W R/W R/W R/W R/W R/W
Address 0121h Bit b7 Symbol CCLR After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 Symbol TOA TOB TOC TOD TCK0 TCK1 TCK2
Bit Name TRCIOA output level select bit (1) TRCIOB output level select bit (1, 2) TRCIOC output level select bit (1, 2) TRCIOD output level select bit (1, 2) Count source select bit (1)
Function Disabled in PWM mode 0: Initial output selected as non-active level 1: Initial output selected as active level
b6 b5 b4
b7
CCLR
TRC counter clear select bit
0 0 0: f1 0 0 1: f2 0 1 0: f4 0 1 1: f8 1 0 0: f32 1 0 1: TRCCLK input rising edge 1 1 0: fOCO40M 1 1 1: fOCO-F (3) 0: Disable clear (free-running operation) 1: Clear by compare match in the TRCGRA register
R/W
j = B, C or D Notes: 1. Set to these bits when the TSTART bit in the TRCMR register is set to 0 (count stops). 2. If the pin function is set for waveform output (refer to 7.5 Port Settings), the initial output level is output when the TRCCR1 register is set. 3. To select fOCO-F, set it to the clock frequency higher than the CPU clock frequency.
19.6.2
Timer RC Control Register 2 (TRCCR2)
b6 TCEG0 0 b5 CSTP 0 b4 -- 1 b3 -- 1 b2 POLD 0 b1 POLC 0 b0 POLB 0 R/W R/W R/W R/W -- R/W
Address 0130h Bit b7 Symbol TCEG1 After Reset 0 Bit b0 b1 b2 b3 b4 b5
b6 b7
Symbol Bit Name Function POLB PWM mode output level control 0: TRCIOB output level selected as "L" active 1: TRCIOB output level selected as "H" active bit B (1) POLC PWM mode output level control 0: TRCIOC output level selected as "L" active 1: TRCIOC output level selected as "H" active bit C (1) 0: TRCIOD output level selected as "L" active POLD PWM mode output level control 1: TRCIOD output level selected as "H" active bit D (1) -- Nothing is assigned. If necessary, set to 0. When read, the content is 1. -- CSTP TRC count operation select bit (2) 0: Count continues at compare match with the TRCGRA register 1: Count stops at compare match with the TRCGRA register TCEG0 TRCTRG input edge select bit (3) b7 b6 0 0: Disable the trigger input from the TRCTRG pin TCEG1 0 1: Rising edge selected 1 0: Falling edge selected 1 1: Both edges selected
R/W R/W
Notes: 1. Enabled when in PWM mode. 2. For notes on PWM2 mode, refer to 19.9.6 TRCMR Register in PWM2 Mode. 3. In timer mode and PWM mode these bits are disabled.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
Table 19.12
Register TRCGRA TRCGRB TRCGRC TRCGRD TRCGRC TRCGRD
Functions of TRCGRj Register in PWM Mode
Setting - - BFC = 0 BFD = 0 BFC = 1 BFD = 1 PWM Output Pin - TRCIOB TRCIOC TRCIOD Buffer register. Set the next PWM period. (Refer to 19.3.2 Buffer - Operation.) Buffer register. Set the next PWM output change point. (Refer to TRCIOB 19.3.2 Buffer Operation.) Register Function General register. Set the PWM period. General register. Set the PWM output change point. General register. Set the PWM output change point.
j = A, B, C, or D BFC, BFD: Bits in TRCMR register Note: 1. The output level does not change even when a compare match occurs if the TRCGRA register value (PWM period) is the same as the TRCGRB, TRCGRC, or TRCGRD register value.
REJ09B0458-0010 Rev.0.10 Page 255 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.6.3
Operating Example
Count source Value in TRC register m
n
p
q
m+1 n+1 Active level "H" TRCIOB output Initial output "L" to compare match Inactive level "L" p+1 m-p m-n
TRCIOC output
Initial output "H" to compare match
Inactive level "H" q+1 m-q
TRCIOD output
Active level "L" Initial output "L" to compare match
IMFA bit in TRCSR register
1 0 Set to 0 by a program Set to 0 by a program
IMFB bit in TRCSR register
1 0
IMFC bit in TRCSR register
1 0 Set to 0 by a program Set to 0 by a program
IMFD bit in TRCSR register
1 0
m: TRCGRA register setting value n: TRCGRB register setting value p: TRCGRC register setting value q: TRCGRD register setting value The above applies under the following conditions: * Bits BFC and BFD in the TRCMR register are set to 0 (registers TRCGRC and TRCGRD do not operate as buffers). * Bits EB, EC, and ED in the TRCOER register are set to 0 (output from TRCIOB, TRCIOC, and TRCIOD enabled). * Bits TOB and TOC in the TRCCR1 register are set to 0 (inactive level), the TOD bit is set to 1 (active level). * The POLB bit in the TRCCR2 register is set to 1 ("H" active), bits POLC and POLD are set to 0 ("L" active).
Figure 19.14
Operating Example of PWM Mode
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
TRC register value p m
q n 0000h
TSTART bit in TRCMR register
1 0 Duty 0%
TRCIOB output does not switch to "L" because no compare match with the TRCGRB register has occurred
TRCIOB output
TRCGRB register
n
p (p>m) Rewritten by a program
q
IMFA bit in TRCSR register
1 0 Set to 0 by a program Set to 0 by a program
IMFB bit in TRCSR register
1 0
TRC register value m
p n 0000h
TSTART bit in TRCMR register
1 0
If compare matches occur simultaneously with registers TRCGRA and TRCGRB, the compare match with the TRCGRB register has priority. TRCIOB output switches to "L". (In other words, no change). Duty 100% TRCIOB output switches to "L" at compare match with the TRCGRB register. (In other words, no change).
TRCIOB output
TRCGRB register
n
m Rewritten by a program
p
IMFA bit in TRCSR register
1 0
Set to 0 by a program IMFB bit in TRCSR register 1 0
Set to 0 by a program
m: TRCGRA register setting value The above applies under the following conditions: * The EB bit in the TRCOER register is set to 0 (output from TRCIOB enabled). * The POLB bit in the TRCCR2 register is set to 0 ("L" active).
Figure 19.15
Operating Example of PWM Mode (Duty 0% and Duty 100%)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.7
PWM2 Mode
This mode outputs a single PWM waveform. After a given wait duration has elapsed following the trigger, the pin output switches to active level. Then, after a given duration, the output switches back to inactive level. Furthermore, the counter stops at the same time the output returns to inactive level, making it possible to use PWM2 mode to output a programmable wait one-shot waveform. Since timer RC uses multiple general registers in PWM2 mode, other modes cannot be used in conjunction with it. Figure 19.16 shows a PWM2 Mode Block Diagram, Table 19.13 lists the Specifications of PWM2 Mode, Table 19.14 lists the Functions of TRCGRj Register in PWM2 Mode, and Figures 19.17 to 19.19 show Operating Examples of PWM2 Mode.
Trigger signal
Compare match signal
TRCTRG
Input control
Count clear signal
(Note 1)
TRC
Comparator
TRCGRA
Comparator
TRCGRB
TRCGRD register
TRCIOB
Output control Comparator TRCGRC
Note: 1. The BFD bit in the TRCMR register is set to 1 (the TRCGRD register functions as the buffer register for the TRCGRB register).
Figure 19.16
PWM2 Mode Block Diagram
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
Table 19.13
Specifications of PWM2 Mode
Specification f1, f2, f4, f8, f32, fOCO40M, fOCO-F, or external signal (rising edge) input to TRCCLK pin Increment TRC register PWM period: 1/fk x (m + 1) (no TRCTRG input) Active level width: 1/fk x (n - p) Wait time from count start or trigger: 1/fk x (p + 1) fk: Count source frequency m: TRCGRA register setting value n: TRCGRB register setting value p: TRCGRC register setting value
TRCTRG input m+1 n+1 p+1 TRCIOB output n-p n-p (TRCTRG: Rising edge, active level is "H") n+1 p+1
Item Count source Count operation PWM waveform
Count start conditions
Count stop conditions
Interrupt request generation timing TRCIOA/TRCTRG pin function TRCIOB pin function PWM output TRCIOC and TRCIOD pin Programmable I/O port functions INT0 pin function Read from timer Write to timer Select functions
* Bits TCEG1 to TCEG0 in the TRCCR2 register are set to 00b (TRCTRG trigger disabled) or the CSEL bit in the TRCCR2 register is set to 0 (count continues). 1 (count starts) is written to the TSTART bit in the TRCMR register. * Bits TCEG1 to TCEG0 in the TRCCR2 register are set to 01b, 10b, or 11b (TRCTRG trigger enabled) and the TSTART bit in the TRCMR register is set to 1 (count starts). A trigger is input to the TRCTRG pin * 0 (count stops) is written to the TSTART bit in the TRCMR register while the CSEL bit in the TRCCR2 register is set to 0 or 1. The TRCIOB pin outputs the initial level in accordance with the value of the TOB bit in the TRCCR1 register. The TRC register retains the value before count stops. * The count stops due to a compare match with TRCGRA while the CSEL bit in the TRCCR2 register is set to 1 The TRCIOB pin outputs the initial level. The TRC register retains the value before count stops if the CCLR bit in the TRCCR1 register is set to 0. The TRC register is set to 0000h if the CCLR bit in the TRCCR1 register is set to 1. * Compare match (contents of TRC and TRCGRj registers match) * The TRC register overflows Programmable I/O port or TRCTRG input
Programmable I/O port, pulse output forced cutoff signal input, or INT0 interrupt input The count value can be read by reading the TRC register. The TRC register can be written to. * External trigger and valid edge selection The edge or edges of the signal input to the TRCTRG pin can be used as the PWM output trigger: rising edge, falling edge, or both rising and falling edges * Buffer operation (Refer to 19.3.2 Buffer Operation.) * Pulse output forced cutoff signal input (Refer to 19.3.4 Forced Cutoff of Pulse Output.) * Digital filter (Refer to 19.3.3 Digital Filter.) * A/D trigger generation
j = A, B, or C
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.7.1
Timer RC Control Register 1 (TRCCR1) in PWM2 Mode
b6 TCK2 0 b5 TCK1 0 b4 TCK0 0 b3 TOD 0 b2 TOC 0 b1 TOB 0 b0 TOA 0 R/W R/W R/W
Address 0121h Bit b7 Symbol CCLR After Reset 0 Bit b0 b1
Symbol Bit Name TOA TRCIOA output level select bit (1) TOB TRCIOB output level select bit (1, 2)
b2 b3 b4 b5 b6
TOC TOD TCK0 TCK1 TCK2
TRCIOC output level select bit (1) TRCIOD output level select bit (1) Count source select bit (1)
Function Disabled in PWM2 mode 0: Active level "H" (Initial output "L" "H" output by compare match in the TRCGRC register "L" output by compare match in the TRCGRB register 1: Active level "L" (Initial output "H" "L" output by compare match in the TRCGRC register "H" output by compare match in the TRCGRB register Disabled in PWM2 mode
b6 b5 b4
b7
CCLR
TRC counter clear select bit
0 0 0: f1 0 0 1: f2 0 1 0: f4 0 1 1: f8 1 0 0: f32 1 0 1: TRCCLK input rising edge 1 1 0: fOCO40M 1 1 1: fOCO-F (3) 0: Disable clear (free-running operation) 1: Clear by compare match in the TRCGRA register
R/W R/W R/W R/W R/W
R/W
Notes: 1. Set to these bits when the TSTART bit in the TRCMR register is set to 0 (count stops). 2. If the pin function is set for waveform output (refer to 7.5 Port Settings), the initial output level is output when the TRCCR1 register is set. 3. To select fOCO-F, set it to the clock frequency higher than the CPU clock frequency.
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R8C/32A Group
19. Timer RC
19.7.2
Timer RC Control Register 2 (TRCCR2) in PWM2 Mode
b6 TCEG0 0 b5 CSTP 0 b4 -- 1 b3 -- 1 b2 POLD 0 b1 POLC 0 b0 POLB 0 R/W R/W R/W R/W -- R/W
Address 0130h Bit b7 Symbol TCEG1 After Reset 0 Bit b0 b1 b2 b3 b4 b5
b6 b7
Symbol Bit Name Function POLB PWM mode output level control 0: TRCIOB output level selected as "L" active 1: TRCIOB output level selected as "H" active bit B (1) POLC PWM mode output level control 0: TRCIOC output level selected as "L" active 1: TRCIOC output level selected as "H" active bit C (1) POLD PWM mode output level control 0: TRCIOD output level selected as "L" active 1: TRCIOD output level selected as "H" active bit D (1) -- Nothing is assigned. If necessary, set to 0. When read, the content is 1. -- CSTP TRC count operation select bit (2) 0: Count continues at compare match with the TRCGRA register 1: Count stops at compare match with the TRCGRA register b7 b6 TCEG0 TRCTRG input edge select bit (3) 0 0: Disable the trigger input from the TRCTRG pin TCEG1 0 1: Rising edge selected 1 0: Falling edge selected 1 1: Both edges selected
R/W R/W
Notes: 1. Enabled when in PWM mode. 2. For notes on PWM2 mode, refer to 19.9.6 TRCMR Register in PWM2 Mode. 3. In timer mode and PWM mode these bits are disabled.
19.7.3
Timer RC Digital Filter Function Select Register (TRCDF) in PWM2 Mode
b6 DFCK0 0 b5 -- 0 b4 DFTRG 0 b3 DFD 0 b2 DFC 0 b1 DFB 0 b0 DFA 0 R/W R/W R/W R/W R/W R/W -- R/W R/W
Address 0131h Bit b7 Symbol DFCK1 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol DFA DFB DFC DFD DFTRG -- DFCK0 DFCK1
Bit Name Function TRCIOA pin digital filter function select bit (1) 0: Function is not used TRCIOB pin digital filter function select bit (1) 1: Function is used TRCIOC pin digital filter function select bit (1) TRCIOD pin digital filter function select bit (1) TRCTRG pin digital filter function select bit (2) Nothing is assigned. If necessary, set to 0. When read, the content is 0. Clock select bits for digital filter function (1, 2) b7 b6 0 0: f32 0 1: f8 1 0: f1 1 1: Count source (clock selected by bits TCK2 to TCK0 in the TRCCR1 register)
Notes: 1. These bits are enabled for the input capture function. 2. These bits are enabled when in PWM2 mode and bits TCEG1 to TCEG0 in the TRCCR2 register are set to 01b, 10b, or 11b (TRCTRG trigger input enabled).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
Table 19.14
Register TRCGRA TRCGRB TRCGRC TRCGRD TRCGRD
Functions of TRCGRj Register in PWM2 Mode
Setting - - BFC = 0 BFD = 0 BFD = 1 Register Function PWM2 Output Pin General register. Set the PWM period. TRCIOB pin General register. Set the PWM output change point. General register. Set the PWM output change point (wait time after trigger). (Not used in PWM2 mode) - Buffer register. Set the next PWM output change point. (Refer to TRCIOB pin 19.3.2 Buffer Operation.)
j = A, B, C, or D BFC, BFD: Bits in TRCMR register Note: 1. Do not set the TRCGRB and TRCGRC registers to the same value.
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R8C/32A Group
19. Timer RC
19.7.4
Operating Example
Count source TRC register value FFFFh m TRC register cleared at TRCGRA register compare match
n Previous value held if the TSTART bit is set to 0 Set to 0000h by a program
p
0000h
TSTART bit in TRCMR register
1 0 Set to 1 by a program
Count stops because the CSEL bit is set to 1 TSTART bit is set to 0
CSEL bit in TRCCR2 register
1 0 m+1 n+1 p+1 "H" output at TRCGRC register compare match "L" initial output Return to initial output if the TSTART bit is set to 0 No change "H" output at TRCGRC register compare match p+1 "L" output at TRCGRB register compare match No change
TRCIOB output
IMFA bit in TRCSR register
1 0
IMFB bit in TRCSR register
1 0
Set to 0 by a program
IMFC bit in TRCSR register
1 0
Set to 0 by a program
Set to 0 by a program
TRCGRB register Transfer TRCGRD register n
n Transfer Next data
Transfer from buffer register to general register m: TRCGRA register setting value n: TRCGRB register setting value p: TRCGRC register setting value The above applies under the following conditions: * The TOB bit in the TRCCR1 register is set to 0 (initial level is "L", "H" output at compare match with the TRCGRC register, "L" output at compare match with the TRCGRB register). * Bits TCEG1 and TCEG0 in the TRCCR2 register are set to 00b (TRCTRG trigger input disabled).
Figure 19.17
Operating Example of PWM2 Mode (TRCTRG Trigger Input Disabled) Apr 01, 2008
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R8C/32A Group
19. Timer RC
Count source TRC register value FFFFh m TRC register (counter) cleared at TRCTRG pin trigger input TRC register cleared at TRCGRA register compare match
n
Previous value held if the TSTART bit is set to 0
Set to 0000h by a program
p
0000h Count starts at TRCTRG pin trigger input Changed by a program The TSTART bit is set to 0 Count stops because the CSEL bit is set to 1
TRCTRG input
Count starts TSTART bit is set to 1 1 0
TSTART bit in TRCMR register
CSEL bit in TRCCR2 register
1 0 Set to 1 by a program m+1 n+1 p+1 "H" output at TRCGRC register compare match "L" output at TRCGRB register compare match p+1 n+1 p+1
TRCIOB output
"L" initial output Active level so TRCTRG input is disabled
IMFA bit in TRCSR register
1 0
Inactive level so TRCTRG input is enabled
Return to initial value if the TSTART bit is set to 0
IMFB bit in TRCSR register
1 0 Set to 0 by a program Set to 0 by a program Set to 0 by a program
Set to 0 by a program
IMFC bit in TRCSR register
1 0
TRCGRB register
n Transfer
n
n Transfer n Transfer
n Transfer Next data
TRCGRD register
Transfer from buffer register to general register
Transfer from buffer register to general register
m: TRCGRA register setting value n: TRCGRB register setting value p: TRCGRC register setting value The above applies under the following conditions: * The TOB bit in the TRCCR1 register is set to 0 (initial level is "L", "H" output at compare match with the TRCGRC register, "L" output at compare match with the TRCGRB register). * Bits TCEG1 and TCEG0 in the TRCCR2 register are set to 11b (trigger at both rising and falling edges of TRCTRG input).
Figure 19.18
Operating Example of PWM2 Mode (TRCTRG Trigger Input Enabled) Apr 01, 2008
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R8C/32A Group
19. Timer RC
* TRCGRB register setting value greater than TRCGRA register setting value
TRC register value n m
* TRCGRC register setting value greater than TRCGRA register setting value
TRC register value p m
n
p 0000h TSTART bit in TRCMR register 1 0 p+1 m+1 No compare match with TRCGRB register, so "H" output continues TRCIOB output TRCIOB output "L" initial output TSTART bit in TRCMR register 0000h 1 0 n+1 m+1 No compare match with TRCGRC register, so "L" output continues "L" output at TRCGRB register compare match with no change.
"H" output at TRCGRC register compare match 1 0 "L" initial output
IMFA bit in TRCSR register
IMFA bit in TRCSR register
1 0
IMFB bit in TRCSR register
1 0 Set to 0 by a program
IMFB bit in TRCSR register
1 0
IMFC bit in TRCSR register
1 0
IMFC bit in TRCSR register
1 0
m: TRCGRA register setting value n: TRCGRB register setting value p: TRCGRC register setting value The above applies under the following conditions: * The TOB bit in the TRCCR1 register is set to 0 (initial level is "L", "H" output at compare match with the TRCGRC register, "L" output at compare match with the TRCGRB register). * Bits TCEG1 and TCEG0 in the TRCCR2 register are set to 00b (TRCTRG trigger input disabled).
Figure 19.19
Operating Example of PWM2 Mode (Duty 0% and Duty 100%)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.8
Timer RC Interrupt
Timer RC generates a timer RC interrupt request from five sources. The timer RC interrupt uses the single TRCIC register (bits IR and ILVL0 to ILVL2) and a single vector. Table 19.15 lists the Registers Associated with Timer RC Interrupt, and Figure 19.20 is a Timer RC Interrupt Block Diagram. Table 19.15 Registers Associated with Timer RC Interrupt Timer RC Interrupt Enable Register TRCIER Timer RC Interrupt Control Register TRCIC
Timer RC Status Register TRCSR
IMFA bit IMIEA bit IMFB bit IMIEB bit IMFC bit IMIEC bit IMFD bit IMIED bit OVF bit OVIE bit Timer RC interrupt request (IR bit in TRCIC register)
IMFA, IMFB, IMFC, IMFD, OVF: Bits in TRCSR register IMIEA, IMIEB, IMIEC, IMIED, OVIE: Bits in TRCIER register
Figure 19.20
Timer RC Interrupt Block Diagram
Like other maskable interrupts, the timer RC interrupt is controlled by the combination of the I flag, IR bit, bits ILVL0 to ILVL2, and IPL. However, it differs from other maskable interrupts in the following respects because a single interrupt source (timer RC interrupt) is generated from multiple interrupt request sources. * The IR bit in the TRCIC register is set to 1 (interrupt requested) when a bit in the TRCSR register is set to 1 and the corresponding bit in the TRCIER register is also set to 1 (interrupt enabled). * The IR bit is set to 0 (no interrupt requested) when the bit in the TRCSR register or the corresponding bit in the TRCIER register is set to 0, or both are set to 0. In other words, the interrupt request is not maintained if the IR bit is once set to 1 but the interrupt is not acknowledged. * If another interrupt source is triggered after the IR bit is set to 1, the IR bit remains set to 1 and does not change. * If multiple bits in the TRCIER register are set to 1, use the TRCSR register to determine the source of the interrupt request. * The bits in the TRCSR register are not automatically set to 0 when an interrupt is acknowledged. Set them to 0 within the interrupt routine. Refer to 19.2.5 Timer RC Status Register (TRCSR), for the procedure for setting these bits to 0. Refer to 19.2.4 Timer RC Interrupt Enable Register (TRCIER), for details of the TRCIER register. Refer to 11.3 Interrupt Control, for details of the TRCIC register and 11.1.5.2 Relocatable Vector Tables, for information on interrupt vectors.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
19. Timer RC
19.9 19.9.1
Notes on Timer RC TRC Register
* The following note applies when the CCLR bit in the TRCCR1 register is set to 1 (clear TRC register at
compare match with TRCGRA register). When using a program to write a value to the TRC register while the TSTART bit in the TRCMR register is set to 1 (count starts), ensure that the write does not overlap with the timing with which the TRC register is set to 0000h. If the timing of the write to the TRC register and the setting of the TRC register to 0000h coincide, the write value will not be written to the TRC register and the TRC register will be set to 0000h.
* Reading from the TRC register immediately after writing to it can result in the value previous to the write
being read out. To prevent this, execute the JMP.B instruction between the read and the write instructions. Program Example MOV.W #XXXXh, TRC ;Write JMP.B L1 ;JMP.B instruction L1: MOV.W TRC,DATA ;Read
19.9.2
TRCSR Register
Reading from the TRCSR register immediately after writing to it can result in the value previous to the write being read out. To prevent this, execute the JMP.B instruction between the read and the write instructions. Program Example MOV.B #XXh, TRCSR ;Write JMP.B L1 ;JMP.B instruction L1: MOV.B TRCSR,DATA ;Read
19.9.3
TRCCR1 Register
To set bits TCK2 to TCK0 in the TRCCR1 register to 111b (fOCO-F), set fOCO-F to the clock frequency higher than the CPU clock frequency.
19.9.4
Count Source Switching
* Stop the count before switching the count source.
Switching procedure (1) Set the TSTART bit in the TRCMR register to 0 (count stops). (2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register.
* After switching the count source from fOCO40M to another clock, allow a minimum of two cycles of f1 to
elapse after changing the clock setting before stopping fOCO40M. Switching procedure (1) Set the TSTART bit in the TRCMR register to 0 (count stops). (2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register. (3) Wait for a minimum of two cycles of f1. (4) Set the FRA00 bit in the FRA0 register to 0 (high-speed on-chip oscillator off).
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19. Timer RC
* After switching the count source from fOCO-F to fOCO40M, allow a minimum of two cycles of fOCO-F to
elapse after changing the clock setting before stopping fOCO-F. Switching procedure (1) Set the TSTART bit in the TRCMR register to 0 (count stops). (2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register. (3) Wait for a minimum of two cycles of fOCO-F. (4) Set the FRA00 bit in the FRA0 register to 0 (high-speed on-chip oscillator off).
* After switching the count source from fOCO-F to a clock other than fOCO40M, allow a minimum of one
cycle of fOCO-F + fOCO40M to elapse after changing the clock setting before stopping fOCO-F. Switching procedure (1) Set the TSTART bit in the TRCMR register to 0 (count stops). (2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register. (3) Wait for a minimum of one cycle of fOCO-F + fOCO40M. (4) Set the FRA00 bit in the FRA0 register to 0 (high-speed on-chip oscillator off).
19.9.5
Input Capture Function
* The pulse width of the input capture signal should be three cycles or more of the timer RC operation clock
(refer to Table 19.1 Timer RC Operation Clock).
* The value of the TRC register is transferred to the TRCGRj register one or two cycles of the timer RC
operation clock after the input capture signal is input to the TRCIOj (j = A, B, C, or D) pin (when the digital filter function is not used).
19.9.6
TRCMR Register in PWM2 Mode
When the CSEL bit in the TRCCR2 register is set to 1 (count stops at compare match with the TRCGRA register), do not set the TRCMR register at compare match timing of registers TRC and TRCGRA.
19.9.7
Count Source fOCO40M
The count source fOCO40M can be used with supply voltage VCC = 2.7 to 5.5 V. For supply voltage other than that, do not set bits TCK2 to TCK0 in the TRCCR1 register to 110b (select fOCO40M as the count source).
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R8C/32A Group
20. Timer RE
20. Timer RE
Timer RE has the 4-bit counter and 8-bit counter.
20.1
Overview
Timer RE has the following 2 modes: * Real-time clock mode Generate 1-second signal from fC4 and count seconds, minutes, hours, and days of the week. * Output compare mode Count a count source and detect compare matches. The count source for timer RE is the operating clock that regulates the timing of timer operations.
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R8C/32A Group
20. Timer RE
20.2
Real-Time Clock Mode
In real-time clock mode, a 1-second signal is generated from fC4 using a divide-by-2 frequency divider, 4-bit counter, and 8-bit counter and used to count seconds, minutes, hours, and days of the week. Figure 20.1 shows a Block Diagram of Real-Time Clock Mode and Table 20.1 lists the Real-Time Clock Mode Specifications. Table 20.2 lists the Interrupt Sources, Figure 20.2 shows the Definition of Time Representation and Figure 20.3 shows the Operating Example in Real-Time Clock Mode.
(1/16) fC4 (8.192kHz) 1/2 4-bit counter
(1/256) 8-bit counter (1s) Overflow
Data bus
Overflow
Overflow
Overflow
TRESEC register
TREMIN register
TREHR register
TREWK register 000 PM bit WKIE
H12_H24 bit
DYIE HRIE
Timing control
Timer RE interrupt
MNIE
INT bit
SEIE
BSY bit
H12_H24, PM, INT: Bits in TRECR1 register SEIE, MNIE, HRIE, DYIE, WKIE: Bits in TRECR2 register BSY: Bit in TRESEC, TREMIN, TREHR, TREWK register
Figure 20.1
Block Diagram of Real-Time Clock Mode
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R8C/32A Group
20. Timer RE
Table 20.1
Real-Time Clock Mode Specifications Specification fC4 Increment 1 (count starts) is written to TSTART bit in TRECR1 register 0 (count stops) is written to TSTART bit in TRECR1 register Select any one of the following: * Update second data * Update minute data * Update hour data * Update day of week data * When day of week data is set to 000b (Sunday) When reading TRESEC, TREMIN, TREHR, or TREWK register, the count value can be read. The values read from registers TRESEC, TREMIN, and TREHR are represented by the BCD code. When bits TSTART and TCSTF in the TRECR1 register are set to 0 (timer stops), the value can be written to registers TRESEC, TREMIN, TREHR, and TREWK. The values written to registers TRESEC, TREMIN, and TREHR are represented by the BCD codes. 12-hour mode/24-hour mode switch function
Item Count source Count operation Count start condition Count stop condition Interrupt request generation timing
Read from timer
Write to timer
Select function
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R8C/32A Group
20. Timer RE
20.2.1
Timer RE Second Data Register (TRESEC) in Real-Time Clock Mode
b6 SC12 0 b5 SC11 0 b4 SC10 0 b3 SC03 0 b2 SC02 0 b1 SC01 0 b0 SC00 0 R/W R/W R/W R/W R/W R/W R/W R/W R
Address 0118h Bit b7 Symbol BSY After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name SC00 1st digit of second count bit SC01 SC02 SC03 SC10 2nd digit of second count bit SC11 SC12 BSY Timer RE busy flag
Function Setting Range Count 0 to 9 every second. When the digit 0 to 9 moves up, 1 is added to the 2nd digit of (BCD code) second. When counting 0 to 5, 60 seconds are counted. 0 to 5 (BCD code)
This bit is set to 1 while registers TRESEC, TREMIN, TREHR, and TREWK are updated
20.2.2
Timer RE Minute Data Register (TREMIN) in Real-Time Clock Mode
b6 MN12 0 b5 MN11 0 b4 MN10 0 b3 MN03 0 b2 MN02 0 b1 MN01 0 b0 MN00 0 R/W R/W R/W R/W R/W R/W R/W R/W R
Address 0119h Bit b7 Symbol BSY After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name MN00 1st digit of minute count bit MN01 MN02 MN03 MN10 2nd digit of minute count bit MN11 MN12 BSY Timer RE busy flag
Function Setting Range Count 0 to 9 every minute. When the digit 0 to 9 moves up, 1 is added to the 2nd digit of (BCD code) minute. When counting 0 to 5, 60 minutes are counted. 0 to 5 (BCD code)
This bit is set to 1 while registers TRESEC, TREMIN, TREHR, and TREWK are updated.
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R8C/32A Group
20. Timer RE
20.2.3
Timer RE Hour Data Register (TREHR) in Real-Time Clock Mode
b6 -- 0 b5 HR11 0 b4 HR10 0 b3 HR03 0 b2 HR02 0 b1 HR01 0 b0 HR00 0 Setting Range 0 to 9 (BCD code) R/W R/W R/W R/W R/W R/W R/W
Address 011Ah Bit b7 Symbol BSY After Reset 0 Bit b0 b1 b2 b3 b4 b5
Symbol Bit Name HR00 1st digit of hour count bit HR01 HR02 HR03 HR10 2nd digit of hour count bit HR11
Function Count 0 to 9 every hour. When the digit moves up, 1 is added to the 2nd digit of hour.
b6 b7
-- BSY
Count 0 to 1 w hen the H12_H24 bit is set 0 to 2 to 0 (12-hour mode). (BCD code) Count 0 to 2 w hen the H12_H24 bit is set to 1 (24-hour mode). Nothing is assigned. If necessary, set to 0. When read, the content is 0. Timer RE busy flag This bit is set to 1 while registers TRESEC, TREMIN, TREHR, and TREWK are updated.
-- R
20.2.4
Timer RE Day of Week Data Register (TREWK) in Real-Time Clock Mode
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 WK2 0 b1 WK1 0 Function
b2 b1 b0
Address 011Bh Bit b7 Symbol BSY After Reset 0 Bit b0 b1 b2
b0 WK0 0 R/W R/W R/W R/W
Symbol Bit Name WK0 Day of week count bit WK1 WK2
b3 b4 b5 b6 b7
-- -- -- -- BSY
0 0 0: Sunday 0 0 1: Monday 0 1 0: Tuesday 0 1 1: Wednesday 1 0 0: Thursday 1 0 1: Friday 1 1 0: Saturday 1 1 1: Do not set. Nothing is assigned. If necessary, set to 0. When read, the content is 0.
--
Timer RE busy flag
This bit is set to 1 while registers TRESEC, TREMIN, TREHR, and TREWK are updated.
R
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
20. Timer RE
20.2.5
Timer RE Control Register 1 (TRECR1) in Real-Time Clock Mode
b5 PM 0 b4 TRERST 0 b3 INT 0 b2 -- 0 b1 TCSTF 0 b0 -- 0 R/W -- R R/W R/W R/W
Address 011Ch Bit b7 b6 Symbol TSTART H12_H24 After Reset 0 0 Bit b0 b1 b2 b3 b4
b5
b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. TCSTF Timer RE count status flag 0: Count stopped 1: Counting -- Reserved bit Set to 0. INT Interrupt request timing bit Set to 1 in real-time clock mode. TRERST Timer RE reset bit When setting this bit to 0, after setting it to 1, the followings will occur. * Registers TRESEC, TREMIN, TREHR, TREWK, and TRECR2 are set to 00h. * Bits TCSTF, INT, PM, H12_H24, and TSTART in the TRECR1 register are set to 0. * The 8-bit counter is set to 00h and the 4-bit counter is set to 0h. PM A.m./p.m. bit When the H12_H24 bit is set to 0 (12-hour mode) (1) 0: a.m. 1: p.m. When the H12_H24 bit is set to 1 (24-hour mode), its value is undefined. H12_H24 Operating mode select bit 0: 12-hour mode 1: 24-hour mode TSTART Timer RE count start bit 0: Count stops 1: Count starts
R/W
R/W R/W
Note: 1. This bit is automatically modified while timer RE counts.
Noon
H12_H24 bit = 1 (24-hour mode) H12_H24 bit = 0 (12-hour mode)
Contents of TREHR Register
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 0
13 1
14 2
15 3
16 4
17 5
Contents of PM bit
Contents in TREWK register
0 (a.m.) 000 (Sunday) Date changes
1 (p.m.)
Contents of TREHR Register
H12_H24 bit = 1 (24-hour mode) H12_H24 bit = 0 (12-hour mode)
18 6
19 7
20 8
21 9
22 10
23 11
0 0
1 1
2 2
3 3

Contents of PM bit
Contents in TREWK register
1 (p.m.) 000 (Sunday)
0 (a.m.) 001 (Monday)
PM bit and H12_H24 bits: Bits in TRECR1 register The above applies to the case when count starts from a.m. 0 on Sunday.
Figure 20.2
Definition of Time Representation
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R8C/32A Group
20. Timer RE
20.2.6
Timer RE Control Register 2 (TRECR2) in Real-Time Clock Mode
b6 -- 0 b5 COMIE 0 b4 WKIE 0 b3 DYIE 0 b2 HRIE 0 b1 MNIE 0 b0 SEIE 0 R/W R/W R/W R/W R/W R/W R/W --
Address 011Dh Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function SEIE Periodic interrupt triggered every 0: Disable periodic interrupt triggered every second 1: Enable periodic interrupt triggered every second second enable bit (1) MNIE Periodic interrupt triggered every 0: Disable periodic interrupt triggered every minute 1: Enable periodic interrupt triggered every minute minute enable bit (1) HRIE Periodic interrupt triggered every 0: Disable periodic interrupt triggered every hour 1: Enable periodic interrupt triggered every hour hour enable bit (1) 0: Disable periodic interrupt triggered every day DYIE Periodic interrupt triggered every 1: Enable periodic interrupt triggered every day day enable bit (1) WKIE Periodic interrupt triggered every 0: Disable periodic interrupt triggered every week 1: Enable periodic interrupt triggered every week week enable bit (1) COMIE Compare match interrupt enable bit Set to 0 in real-time clock mode. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. --
Note: 1. Do not set multiple enable bits to 1 (enable interrupt).
Table 20.2
Interrupt Sources Interrupt Source Value in TREWK register is set to 000b (Sunday) (1-week period) TREWK register is updated (1-day period) TREHR register is updated (1-hour period) TREMIN register is updated (1-minute period) TRESEC register is updated (1-second period) Interrupt Enable Bit WKIE DYIE HRIE MNIE SEIE
Factor Periodic interrupt triggered every week Periodic interrupt triggered every day Periodic interrupt triggered every hour Periodic interrupt triggered every minute Periodic interrupt triggered every second
REJ09B0458-0010 Rev.0.10 Page 275 of 572
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R8C/32A Group
20. Timer RE
20.2.7
Timer RE Count Source Select Register (TRECSR) in Real-Time Clock Mode
b6 -- 0 b5 -- 0 b4 -- 0 b3 RCS3 1 b2 RCS2 0 b1 RCS1 0 b0 RCS0 0 R/W R/W R/W R/W R/W R/W
Address 011Eh Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol RCS0 RCS1 RCS2 RCS3 -- -- -- --
Bit Name Count source select bit 4-bit counter select bit Real-time clock mode select bit Reserved bits
Function Set to 00b in real-time clock mode. Set to 0 in real-time clock mode. Set to 1 in real-time clock mode. Set to 0.
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
--
REJ09B0458-0010 Rev.0.10 Page 276 of 572
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R8C/32A Group
20. Timer RE
20.2.8
Operating Example
1s Approx. 62.5 ms BSY bit Approx. 62.5 ms
Bits SC12 to SC00 in TRESEC register
58
59
00
Bits MN12 to MN00 in TREMIN register
03
04
Bits HR11 to HR00 in TREHR register
(Not changed)
PM bit in TRECR1 register
1 (Not changed) 0
Bits WK2 to WK0 in TREWK register
(Not changed) Set to 0 by acknowledgement of interrupt request or a program
IR bit in TREIC register (when SEIE bit in TRECR2 register is set to 1 (enable periodic interrupt triggered every second)) IR bit in TREIC register (when MNIE bit in TRECR2 register is set to 1 (enable periodic interrupt triggered every minute))
1 0
1 0
BSY: Bit in registers TRESEC, TREMIN, TREHR, and TREWK
Figure 20.3
Operating Example in Real-Time Clock Mode
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
20. Timer RE
20.3
Output Compare Mode
In output compare mode, the internal count source divided by 2 is counted using the 4-bit or 8-bit counter and compare value match is detected with the 8-bit counter. Figure 20.4 shows a Block Diagram of Output Compare Mode and Table 20.3 lists the Output Compare Mode Specifications. Figure 20.5 shows the Operating Example in Output Compare Mode.
RCS1 to RCS0
f4 f8
f32 fC4
= 00b = 01b = 10b = 11b
RCS2 = 0
1/2
4-bit counter
RCS2 = 1
8-bit counter
Comparison circuit
TRERST: Bit in TRECR1 register COMIE: Bit in TRECR2 register RCS0 to RCS2: Bits in TRECSR register
Match signal COMIE Timer RE interrupt
TRESEC
TREMIN
Data bus
Figure 20.4
Block Diagram of Output Compare Mode
REJ09B0458-0010 Rev.0.10 Page 278 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
20. Timer RE
Table 20.3
Output Compare Mode Specifications Specification f4, f8, f32, fC4 * Increment * When the 8-bit counter content matches with the TREMIN register content, the value returns to 00h and count continues. The count value is held while count stops. * When RCS2 = 0 (4-bit counter is not used) 1/fi x 2 x (n+1) * When RCS2 = 1 (4-bit counter is used) 1/fi x 32 x (n+1) fi: Frequency of count source n: Setting value of TREMIN register 1 (count starts) is written to the TSTART bit in the TRECR1 register 0 (count stops) is written to the TSTART bit in the TRECR1 register When the 8-bit counter content matches with the TREMIN register content When reading the TRESEC register, the 8-bit counter value can be read. When reading the TREMIN register, the compare value can be read. Writing to the TRESEC register is disabled. When bits TSTART and TCSTF in the TRECR1 register are set to 0 (timer stops), writing to the TREMIN register is enabled. * Select use of 4-bit counter
Item Count sources Count operations
Count period
Count start condition Count stop condition Interrupt request generation timing Read from timer Write to timer
Selectable functions
REJ09B0458-0010 Rev.0.10 Page 279 of 572
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R8C/32A Group
20. Timer RE
20.3.1
Timer RE Counter Data Register (TRESEC) in Output Compare Mode
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 -- 0 R/W R
Address 0118h Bit b7 Symbol -- After Reset 0
Bit Function b7 to b0 8-bit counter data can be read. Although Timer RE stops counting, the count value is held. The TRESEC register is set to 00h at the compare match.
20.3.2
Timer RE Compare Data Register (TREMIN) in Output Compare Mode
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 Function b2 -- 0 b1 -- 0 b0 -- 0 R/W R/W
Address 0119h Bit b7 Symbol -- After Reset 0
Bit b7 to b0 8-bit compare data is stored.
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R8C/32A Group
20. Timer RE
20.3.3
Timer RE Control Register 1 (TRECR1) in Output Compare Mode
b5 PM 0 b4 TRERST 0 b3 INT 0 b2 -- 0 b1 TCSTF 0 b0 -- 0 R/W -- R R/W R/W R/W
Address 011Ch Bit b7 b6 Symbol TSTART H12_H24 After Reset 0 0 Bit b0 b1 b2 b3 b4 Symbol -- TCSTF
b5 b6 b7
Bit Name Function Nothing is assigned. If necessary, set to 0. When read, the content is 0. Timer RE count status flag 0: Count stopped 1: Counting -- Reserved bit Set to 0. INT Interrupt request timing bit Set to 0 in output compare mode. TRERST Timer RE reset bit When setting this bit to 0, after setting it to 1, the following will occur. * Registers TRESEC, TREMIN, TREHR, TREWK, and TRECR2 are set to 00h. * Bits TCSTF, INT, PM, H12_H24, and TSTART in the TRECR1 register are set to 0. * The 8-bit counter is set to 00h and the 4-bit counter is set to 0h. PM A.m./p.m. bit Set to 0 in output compare mode. H12_H24 Operating mode select bit TSTART Timer RE count start bit 0: Count stops 1: Count starts
R/W R/W R/W
20.3.4
Timer RE Control Register 2 (TRECR2) in Output Compare Mode
b6 -- 0 b5 COMIE 0 b4 WKIE 0 b3 DYIE 0 b2 HRIE 0 b1 MNIE 0 b0 SEIE 0 R/W R/W R/W R/W R/W R/W R/W --
Address 011Dh Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol SEIE MNIE HRIE DYIE WKIE COMIE -- --
Bit Name Function Periodic interrupt triggered every Set to 0 in output compare mode. second enable bit Periodic interrupt triggered every minute enable bit Periodic interrupt triggered every hour enable bit Periodic interrupt triggered every day enable bit Periodic interrupt triggered every week enable bit Compare match interrupt enable bit 0: Disable compare match interrupt 1: Enable compare match interrupt Nothing is assigned. If necessary, set to 0. When read, the content is 0.
REJ09B0458-0010 Rev.0.10 Page 281 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
20. Timer RE
20.3.5
Timer RE Count Source Select Register (TRECSR) in Output Compare Mode
b6 -- 0 b5 -- 0 b4 -- 0 b3 RCS3 1 b2 RCS2 0 b1 RCS1 0 Function
b1 b0
Address 011Eh Bit b7 Symbol -- After Reset 0 Bit b0 b1 Symbol RCS0 RCS1
b0 RCS0 0 R/W R/W R/W
Bit Name Count source select bit (1)
b2 b3 b4 b5 b6 b7
RCS2 RCS3 -- -- -- --
4-bit counter select bit Real-time clock mode select bit Reserved bits
0 0: f4 0 1: f8 1 0: f32 1 1: fC4 0: Not used 1: Used Set to 0 in output compare mode. Set to 0.
R/W R/W R/W
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
--
Note: 1. Write to bits RCS0 to RCS1 when the TCSTF bit in the TRECR1 register is set to 0 (count stopped).
REJ09B0458-0010 Rev.0.10 Page 282 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
20. Timer RE
20.3.6
Operating Example
Count starts
8-bit counter content (hexadecimal number)
TREMIN register setting value
Matched
Matched
Matched
00h
Set to 1 by a program
Time
TSTART bit in TRECR1 register
1 0
2 cycles of maximum count source
TCSTF bit in TRECR1 register
1 0
Set to 0 by acknowledgement of interrupt request
or a program
IR bit in TREIC register
1 0
The above applies under the following conditions. COMIE bit in TRECR2 register = 1 (enable compare match interrupt)
Figure 20.5
Operating Example in Output Compare Mode
REJ09B0458-0010 Rev.0.10 Page 283 of 572
Apr 01, 2008
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
20. Timer RE
20.4 20.4.1
Notes on Timer RE Starting and Stopping Count
Timer RE has the TSTART bit for instructing the count to start or stop, and the TCSTF bit, which indicates count start or stop. Bits TSTART and TCSTF are in the TRECR1 register. Timer RE starts counting and the TCSTF bit is set to 1 (count starts) when the TSTART bit is set to 1 (count starts). It takes up to 2 cycles of the count source until the TCSTF bit is set to 1 after setting the TSTART bit to 1. During this time, do not access registers associated with timer RE (1) other than the TCSTF bit. Also, timer RE stops counting when setting the TSTART bit to 0 (count stops) and the TCSTF bit is set to 0 (count stops). It takes the time for up to 2 cycles of the count source until the TCSTF bit is set to 0 after setting the TSTART bit to 0. During this time, do not access registers associated with timer RE other than the TCSTF bit. Note: 1. Registers associated with timer RE: TRESEC, TREMIN, TREHR, TREWK, TRECR1, TRECR2, and TRECSR.
20.4.2
Register Setting
Write to the following registers or bits when timer RE is stopped. * Registers TRESEC, TREMIN, TREHR, TREWK, and TRECR2 * Bits H12_H24, PM, and INT in TRECR1 register * Bits RCS0 to RCS3 in TRECSR register Timer RE is stopped when bits TSTART and TCSTF in the TRECR1 register are set to 0 (timer RE stopped). Also, set all above-mentioned registers and bits (immediately before timer RE count starts) before setting the TRECR2 register. Figure 20.6 shows a Setting Example in Real-Time Clock Mode.
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R8C/32A Group
20. Timer RE
TSTART in TRECR1 = 0
Stop timer RE operation TCSTF in TRECR1 = 0?
TREIC 00h (disable timer RE interrupt)
TRERST in TRECR1 = 1 Timer RE register and control circuit reset TRERST in TRECR1 = 0
Setting of registers TRECSR, TRESEC, TREMIN, TREHR, TREWK, and bits H12_H24, PM, and INT in TRECR1 register
Select clock output Select clock source Seconds, minutes, hours, days of week, operating mode Set a.m./p.m., interrupt timing
Setting of TRECR2 Setting of TREIC (IR bit 0, select interrupt priority level)
Select interrupt source
TSTART in TRECR1 = 1 Start timer RE operation TCSTF in TRECR1 = 1?
Figure 20.6
Setting Example in Real-Time Clock Mode
REJ09B0458-0010 Rev.0.10 Page 285 of 572
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R8C/32A Group
20. Timer RE
20.4.3
Time Reading Procedure of Real-Time Clock Mode
In real-time clock mode, read registers TRESEC, TREMIN, TREHR, and TREWK when time data is updated and read the PM bit in the TRECR1 register when the BSY bit is set to 0 (not while data is updated). Also, when reading several registers, an incorrect time will be read if data is updated before another register is read after reading any register. In order to prevent this, use the reading procedure shown below.
* Using an interrupt
Read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the TRECR1 register in the timer RE interrupt routine.
* Monitoring with a program 1
Monitor the IR bit in the TREIC register with a program and read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the TRECR1 register after the IR bit in the TREIC register is set to 1 (timer RE interrupt request generated).
* Monitoring with a program 2
(1) Monitor the BSY bit. (2) Monitor until the BSY bit is set to 0 after the BSY bit is set to 1 (approximately 62.5 ms while the BSY bit is set to 1). (3) Read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the TRECR1 register after the BSY bit is set to 0.
* Using read results if they are the same value twice
(1) Read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the TRECR1 register. (2) Read the same register as (1) and compare the contents. (3) Recognize as the correct value if the contents match. If the contents do not match, repeat until the read contents match with the previous contents. Also, when reading several registers, read them as continuously as possible.
REJ09B0458-0010 Rev.0.10 Page 286 of 572
Apr 01, 2008
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R8C/32A Group
21. Serial Interface (UART0)
21. Serial Interface (UART0)
The serial interface consists of two channels, UART0, UART2. This chapter describes the UART0.
21.1
Overview
UART0 has a dedicated timer to generate a transfer clock and operate independently. UART0 supports clock synchronous serial I/O mode and clock asynchronous serial I/O mode (UART mode). Figure 21.1 shows a UART0 Block Diagram. Figure 21.2 shows a Block Diagram of UART0 Transmit/Receive Unit. Table 21.1 lists the Pin Configuration of UART0.
UART0
RXD0 CLK1 and CLK0 = 00b f1 f8 f32 fC
= 01b = 10b = 11b External CKDIR = 1 Clock synchronous type
TXD0 1/16
UART reception Reception control circuit Receive clock
CKDIR = 0 Internal U0BRG register
Clock synchronous type
1/(n0+1)
1/16
UART transmission Transmission control circuit
Transmit clock
Transmit/ receive unit
1/2
Clock synchronous type (internal clock selected)
Clock synchronous type (internal clock selected) Clock synchronous type (external clock selected)
CKDIR = 0 CKDIR = 1
CLK0
CLK polarity switch circuit
CKDIR: Bit in U0MR register CLK0, CLK1: Bits in U0C0 register
Figure 21.1
UART0 Block Diagram
REJ09B0458-0010 Rev.0.10 Page 287 of 572
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R8C/32A Group
21. Serial Interface (UART0)
1SP
PRYE = 0 Clock PAR disabled synchronous type
Clock synchronous type UART (7 bits) UART (8 bits) UART (7 bits) UART0 receive register
RXD0
SP
2SP
SP
PAR
PAR enabled UART PRYE = 1 UART (9 bits) Clock synchronous type UART (8 bits) UART (9 bits)
0
0
0
0
0
0
0
D8
D7
D6
D5
D4
D3
D2
D1
D0 U0RB register
MSB/LSB conversion circuit Data bus high-order bits Data bus low-order bits MSB/LSB conversion circuit D8 D7
UART (8 bits) UART (9 bits) Clock synchronous type
D6
D5
D4
D3
D2
D1
D0 U0TB register
2SP
PRYE = 1 PAR enabled
UART (9 bits) UART
SP
SP
1SP
PAR
Clock PAR disabled synchronous PRYE = 0 type 0 UART (7 bits) UART (8 bits) Clock synchronous type UART (7 bits) UART0 transmit register SP: Stop bit PAR: Parity bit
TXD0
Figure 21.2
Block Diagram of UART0 Transmit/Receive Unit
Table 21.1 Pin Name TXD0 RXD0 CLK0
Pin Configuration of UART0 Assigned Pin P1_4 P1_5 P1_6 I/O Output Input I/O Function Serial data output Serial data input Transfer clock I/O
REJ09B0458-0010 Rev.0.10 Page 288 of 572
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R8C/32A Group
21. Serial Interface (UART0)
21.2 21.2.1
Registers UART0 Transmit/Receive Mode Register (U0MR)
b5 PRY 0 b4 STPS 0 b3 CKDIR 0 b2 SMD2 0 b1 SMD1 0 Function
b2 b1 b0
Address 00A0h (U0MR) Bit b7 b6 Symbol -- PRYE After Reset 0 0 Bit b0 b1 b2 Symbol SMD0 SMD1 SMD2
b0 SMD0 0 R/W R/W R/W R/W
Bit Name Serial I/O mode select bit
b3 b4 b5
CKDIR STPS PRY
Internal/external clock select bit Stop bit length select bit Odd/even parity select bit
b6 b7
PRYE --
Parity enable bit Reserved bit
0 0 0: Serial interface disabled 0 0 1: Clock synchronous serial I/O mode 1 0 0: UART mode, transfer data 7 bits long 1 0 1: UART mode, transfer data 8 bits long 1 1 0: UART mode, transfer data 9 bits long Other than above: Do not set. 0: Internal clock 1: External clock 0: One stop bit 1: Two stop bits Enabled when PRYE = 1 0: Odd parity 1: Even parity 0: Parity disabled 1: Parity enabled Set to 0.
R/W R/W R/W
R/W R/W
21.2.2
UART0 Bit Rate Register (U0BRG)
b5 -- X b4 -- X b3 -- X b2 -- X b1 -- X b0 -- X Setting Range 00h to FFh R/W W
Address 00A1h (U0BRG) Bit b7 b6 Symbol -- -- After Reset X X
Bit Function b7 to b0 If the setting value is n, U0BRG divides the count source by n+1.
Write to the U0BRG register while transmission and reception stop. Use the MOV instruction to write to this register. Set bits CLK0 and CLK1 in the U0C0 register before writing to the U0BRG register.
REJ09B0458-0010 Rev.0.10 Page 289 of 572
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R8C/32A Group
21. Serial Interface (UART0)
21.2.3
UART0 Transmit Buffer Register (U0TB)
b4 -- X b12 -- X b3 -- X b11 -- X b2 -- X b10 -- X b1 -- X b9 -- X b0 -- X b8 -- X R/W W
Address 00A3h to 00A2h (U0TB) Bit b7 b6 b5 Symbol -- -- -- After Reset X X X Bit Symbol After Reset Bit b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 b15 -- X b14 -- X b13 -- X
Symbol Function -- Transmit data -- -- -- -- -- -- -- -- -- Nothing is assigned. If necessary, set to 0. When read, the content is undefined. -- -- -- -- -- --
--
If the transfer data is 9 bits long, write data to the high-order byte first, then low-order byte of the U0TB register. Use the MOV instruction to write to this register.
REJ09B0458-0010 Rev.0.10 Page 290 of 572
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21. Serial Interface (UART0)
21.2.4
UART0 Transmit/Receive Control Register 0 (U0C0)
b5 NCH 0 b4 -- 0 b3 TXEPT 1 b2 -- 0 b1 CLK1 0 Function
b1 b0
Address 00A4h (U0C0) Bit b7 b6 Symbol UFORM CKPOL After Reset 0 0 Bit b0 b1 Symbol CLK0 CLK1
b0 CLK0 0 R/W R/W R/W
b2 b3
b4 b5 b6
b7
0 0: f1 selected 0 1: f8 selected 1 0: f32 selected 1 1: fC selected -- Reserved bit Set to 0. TXEPT Transmit register empty flag 0: Data present in the transmit register (transmission in progress) 1: No data in the transmit register (transmission completed) -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. NCH Data output select bit 0: TXD0 pin set to CMOS output 1: TXD0 pin set to N-channel open-drain output CKPOL CLK polarity select bit 0: Transmit data output at the falling edge and receive data input at the rising edge of the transfer clock 1: Transmit data output at the rising edge and receive data input at the falling edge of the transfer clock UFORM Transfer format select bit 0: LSB first 1: MSB first
Bit Name BRG count source select bit (1)
R/W R
-- R/W R/W
R/W
Note: 1. If the BRG count source is switched, set the U0BRG register again.
21.2.5
UART0 Transmit/Receive Control Register 1 (U0C1)
b5 U0RRM 0 b4 U0IRS 0 b3 RI 0 b2 RE 0 b1 TI 1 b0 TE 0 R/W R/W R R/W R R/W R/W --
Address 00A5h (U0C1) Bit b7 b6 Symbol -- -- After Reset 0 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol TE
Function 0: Transmission disabled 1: Transmission enabled TI Transmit buffer empty flag 0: Data present in the U0TB register 1: No data in the U0TB register RE Receive enable bit 0: Reception disabled 1: Reception enabled RI 0: No data in the U0RB register Receive complete flag (1) 1: Data present in the U0RB register U0IRS UART0 transmit interrupt source 0: Transmission buffer empty (TI = 1) select bit 1: Transmission completed (TXEPT = 1) U0RRM UART0 continuous receive mode 0: Continuous receive mode disabled 1: Continuous receive mode enabled enable bit (2) -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. --
Bit Name Transmit enable bit
Notes: 1. The RI bit is set to 0 when the higher byte of the U0RB register is read. 2. In UART mode, set the U0RRM bit to 0 (continuous receive mode disabled).
REJ09B0458-0010 Rev.0.10 Page 291 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
21. Serial Interface (UART0)
21.2.6
UART0 Receive Buffer Register (U0RB)
b4 -- X b12 OER X b3 -- X b11 -- X b2 -- X b10 -- X b1 -- X b9 -- X b0 -- X b8 -- X R/W R
Address 00A7h to 00A6h (U0RB) Bit b7 b6 b5 Symbol -- -- -- After Reset X X X Bit Symbol After Reset Bit b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 b15 SUM X b14 PER X b13 FER X Bit Name --
Symbol -- -- -- -- -- -- -- -- -- -- -- -- OER FER PER SUM
Function Receive data (D7 to D0)
-- Receive data (D8) Nothing is assigned. If necessary, set to 0. When read, the content is undefined.
R --
Overrun error flag (1) Framing error flag (1) Parity error flag (1) Error sum flag (1)
0: No overrun error 1: Overrun error 0: No framing error 1: Framing error 0: No parity error 1: Parity error 0: No error 1: Error
R R R R
Note: 1. Bits SUM, PER, FER, and OER are set to 0 (no error) when either of the following is set: - Bits SMD2 to SMD0 in the U0MR register are set to 000b (serial interface disabled), or - The RE bit in the U0C1 register is set to 0 (reception disabled) The SUM bit is set to 0 (no error) when all of bits PER, FER, and OER are set to 0 (no error). Bits PER and FER are also set to 0 when the high-order byte of the U0RB register is read.
Always read the U0RB register in 16-bit units.
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21. Serial Interface (UART0)
21.2.7
UART0 Pin Select Register (U0SR)
b6 -- 0 b5 -- 0 b4 CLK0SEL0 0 b3 -- 0 b2 RXD0SEL0 0 b1 -- 0 b0 TXD0SEL0 0 R/W R/W -- R/W -- R/W --
Address 0188h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Function 0: TXD0 pin not used 1: P1_4 assigned -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. RXD0SEL0 RXD0 pin select bit 0: RXD0 pin not used 1: P1_5 assigned -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. CLK0SEL0 CLK0 pin select bit 0: CLK0 pin not used 1: P1_6 assigned -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- --
Symbol Bit Name TXD0SEL0 TXD0 pin select bit
The U0SR register selects which pin is assigned to the UART0 I/O. To use the I/O pin for UART0, set this register. Set the U0SR register before setting the UART0 associated registers. Also, do not change the setting value in this register during UART0 operation.
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21. Serial Interface (UART0)
21.3
Clock Synchronous Serial I/O Mode
In clock synchronous serial I/O mode, data is transmitted and received using a transfer clock. Table 21.2 lists the Clock Synchronous Serial I/O Mode Specifications. Table 21.3 lists the Registers Used and Settings in Clock Synchronous Serial I/O Mode (1). Table 21.2 Clock Synchronous Serial I/O Mode Specifications Specification * Transfer data length: 8 bits * The CKDIR bit in the U0MR register is set to 0 (internal clock): fi/(2(n+1)) fi = f1, f8, f32, fC n = setting value in the U0BRG register: 00h to FFh * The CKDIR bit is set to 1 (external clock): Input from the CLK0 pin * To start transmission, the following requirements must be met: (1) - The TE bit in the U0C1 register is set to 1 (transmission enabled). - The TI bit in the U0C1 register is set to 0 (data present in the U0TB register). * To start reception, the following requirements must be met: (1) - The RE bit in the U0C1 register is set to 1 (reception enabled). - The TE bit in the U0C1 register is set to 1 (transmission enabled). - The TI bit in the U0C1 register is set to 0 (data present in the U0TB register). * For transmission: One of the following can be selected. - The U0IRS bit is set to 0 (transmit buffer empty): When data is transferred from the U0TB register to the UART0 transmit register (at start of transmission). - The U0IRS bit is set to 1 (transmission completed): When data transmission from the UART0 transmit register is completed. * For reception: When data is transferred from the UART0 receive register to the U0RB register (at completion of reception). * Overrun error (2) This error occurs if the serial interface starts receiving the next unit of data before reading the U0RB register and receives the 7th bit of the next unit of data. * CLK polarity selection Transfer data input/output can be selected to occur synchronously with the rising or the falling edge of the transfer clock. * LSB first, MSB first selection Whether transmitting or receiving data begins with bit 0 or begins with bit 7 can be selected. * Continuous receive mode selection Reception is enabled immediately by reading the U0RB register.
Item Transfer data format Transfer clocks
Transmit start conditions
Receive start conditions
Interrupt request generation timing
Error detection
Selectable functions
Notes: 1. When an external clock is selected, the requirements must be met in either of the following states: - The external clock is held high when the CKPOL bit in the U0C0 register is set to 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock) - The external clock is held low when the CKPOL bit in the U0C0 register is set to 1 (transmit data output at the rising edge and receive data input at the falling edge of the transfer clock) 2. If an overrun error occurs, the receive data (b0 to b8) in the U0RB register will be undefined. The IR bit in the S0RIC register remains unchanged.
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21. Serial Interface (UART0)
Table 21.3 Register U0TB U0RB U0BRG U0MR U0C0
Registers Used and Settings in Clock Synchronous Serial I/O Mode (1) Bit b0 to b7 b0 to b7 OER b0 to b7 SMD2 to SMD0 CKDIR CLK1, CLK0 TXEPT NCH CKPOL UFORM TE TI RE RI U0IRS U0RRM Function Set data transmission. Receive data can be read. Overrun error flag Set a bit rate. Set to 001b. Select the internal clock or external clock. Select the count source for the U0BRG register. Transmit register empty flag Select TXD0 pin output mode. Select the transfer clock polarity. Select LSB first or MSB first. Set to 1 to enable transmission/reception Transmit buffer empty flag Set to 1 to enable reception. Receive complete flag Select the UART0 transmit interrupt source. Set to 1 to use continuous receive mode.
U0C1
Note: 1. Set the bits not listed in this table to 0 when writing to the above registers in clock synchronous serial I/O mode.
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21. Serial Interface (UART0)
Table 21.4 lists the I/O Pin Functions in Clock Synchronous Serial I/O Mode. After UART0 operating mode is selected, the TXD0 pin outputs a "H" level until transfer starts. (If the NCH bit is set to 1 (N-channel open-drain output), this pin is in the high-impedance state.) Table 21.4 Pin Name TXD0 (P1_4) I/O Pin Functions in Clock Synchronous Serial I/O Mode Selection Method TXD0SEL0 bit in U0SR register = 1 For reception only: P1_4 can be used as a port by setting TXD0SEL0 bit = 0. Serial data input RXD0SEL0 bit in U0SR register = 1 PD1_5 bit in PD1 register = 0 For transmission only: P1_5 can be used as a port by setting RXD0SEL0 bit = 0. Transfer clock output CLK0SEL0 bit in U0SR register = 1 CKDIR bit in U0MR register = 0 Transfer clock input CLK0SEL0 bit in U0SR register = 1 CKDIR bit in U0MR register = 1 PD1_6 bit in PD1 register = 0 Function Serial data output
RXD0 (P1_5)
CLK0 (P1_6)
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21. Serial Interface (UART0)
* Transmit Timing Example (Internal Clock Selected)
TC
Transfer clock
TE bit in U0C1 register TI bit in U0C1 register
1 0 1 0
Data is set in U0TB register.
Data transfer from U0TB register to UART0 transmit register TCLK Pulsing stops because TE bit is set to 0.
CLK0
TXD0
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
TXEPT bit in U0C0 register
1 0
IR bit in S0TIC register
1 0
Set to 0 when an interrupt request is acknowledged or by a program.
The above applies when: * CKDIR bit in U0MR register = 0 (internal clock) * CKPOL bit in U0C0 register = 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock) * U0IRS bit in U0C1 register = 0 (interrupt request generation when the transmit buffer is empty)
TC = TCLK = 2(n+1)/fi fi: Frequency of U0BRG count source (f1, f8, f32, fC) n: Setting value in U0BRG register
* Receive Timing Example (External Clock Selected)
RE bit in U0C1 register TE bit in U0C1 register TI bit in U0C1 register 1 0 1 0 1 0
Data transfer from U0TB register to UART0 transmit register 1/fEXT
Dummy data is set in U0TB register.
CLK0
Receive data taken in
RXD0
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
RI bit in U0C1 register
1 0 1 0
Data transfer from UART0 receive register to U0RB register
Data read from U0RB register
IR bit in S0RIC register
Set to 0 by an interrupt request acknowledgement or by a program.
The above applies when: * CKDIR bit in U0MR register = 1 (external clock) * CKPOL bit in U0C0 register = 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock) The following should be met when "H" is applied to the CLK0 pin before receiving data: * TE bit in U0C1 register = 1 (transmission enabled) * RE bit in U0C1 register = 1 (reception enabled) * Dummy data is written to U0TB register fEXT: Frequency of external clock
Figure 21.3
Transmit and Receive Timing in Clock Synchronous Serial I/O Mode
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21. Serial Interface (UART0)
21.3.1
Polarity Select Function
Figure 21.4 shows the Transfer Clock Polarity. Use the CKPOL bit in the U0C0 register to select the transfer clock polarity.
* CKPOL bit in U0C0 register = 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock)
CLK0 (1)
TXD0
D0
D1
D2
D3
D4
D5
D6
D7
RXD0
D0
D1
D2
D3
D4
D5
D6
D7
* CKPOL bit in U0C0 register = 1 (transmit data output at the rising edge and receive data input at the falling edge of the transfer clock)
CLK0 (2) TXD0 D0 D1 D2 D3 D4 D5 D6 D7
RXD0
D0
D1
D2
D3
D4
D5
D6
D7
Notes: 1. The CLK0 pin level is high during no transfer. 2. The CLK0 pin level is low during no transfer.
Figure 21.4
Transfer Clock Polarity
21.3.2
LSB First/MSB First Select Function
Figure 21.5 shows the Transfer Format. Use the UFORM bit in the U0C0 register to select the transfer format.
* UFORM bit in U0C0 register = 0 (LSB first) (1)
CLK0
TXD0
D0
D1
D2
D3
D4
D5
D6
D7
RXD0
D0
D1
D2
D3
D4
D5
D6
D7
* UFORM bit in U0C0 register = 1 (MSB first) (1)
CLK0
TXD0
D7
D6
D5
D4
D3
D2
D1
D0
RXD0
D7
D6
D5
D4
D3
D2
D1
D0
Note: 1. The above applies when: CKPOL bit in U0C0 register = 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock).
Figure 21.5
Transfer Format
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21. Serial Interface (UART0)
21.3.3
Continuous Receive Mode
Continuous receive mode is selected by setting the U0RRM bit in the U0C1 register to 1 (continuous receive mode enabled). In this mode, reading the U0RB register sets the TI bit in the U0C1 register to 0 (data present in the U0TB register). If the U0RRM bit is set to 1, do not write dummy data to the U0TB register by a program.
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21. Serial Interface (UART0)
21.4
Clock Asynchronous Serial I/O (UART) Mode
The UART mode allows data transmission and reception after setting the desired bit rate and transfer data format. Table 21.5 lists the UART Mode Specifications. Table 21.6 lists the Registers Used and Settings in UART Mode. Table 21.5 UART Mode Specifications Specification * Character bits (transfer data): Selectable among 7, 8 or 9 bits * Start bit: 1 bit * Parity bit: Selectable among odd, even, or none * Stop bits: Selectable among 1 or 2 bits * The CKDIR bit in the U0MR register is set to 0 (internal clock): fj/(16(n+1)) fj = f1, f8, f32, fC n = setting value in the U0BRG register: 00h to FFh * The CKDIR bit is set to 1 (external clock): fEXT/(16(n+1)) fEXT: Input from the CLK0 pin, n = setting value in the U0BRG register: 00h to FFh * To start transmission, the following requirements must be met: - The TE bit in the U0C1 register is set to 1 (transmission enabled). - The TI bit in the U0C1 register is set to 0 (data present in the U0TB register). * To start reception, the following requirements must be met: - The RE bit in the U0C1 register is set to 1 (reception enabled). - Start bit detection * For transmission: One of the following can be selected. - The U0IRS bit is set to 0 (transmit buffer empty): When data is transferred from the U0TB register to the UART0 transmit register (at start of transmission). - The U0IRS bit is set to 1 (transfer completed): When data transmission from the UART0 transmit register is completed. * For reception: When data is transferred from the UART0 receive register to the U0RB register (at completion of reception). * Overrun error (1) This error occurs if the serial interface starts receiving the next unit of data before reading the U0RB register and receive the bit one before the last stop bit of the next unit of data. * Framing error This error occurs when the set number of stop bits is not detected. * Parity error This error occurs when parity is enabled, and the number of 1's in the parity and character bits do not match the set number of 1's. * Error sum flag This flag is set is set to 1 if an overrun, framing, or parity error occurs.
Item Transfer data formats
Transfer clocks
Transmit start conditions
Receive start conditions
Interrupt request generation timing
Error detection
Note: 1. If an overrun error occurs, the receive data (b0 to b8) in the U0RB register will be undefined. The IR bit in the S0RIC register remains unchanged.
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21. Serial Interface (UART0)
Table 21.6 Register U0TB U0RB U0BRG U0MR
Registers Used and Settings in UART Mode Bit b0 to b8 b0 to b8 OER,FER,PER,SUM b0 to b7 SMD2 to SMD0 Set transmit data. (1) Function Receive data can be read. (2) Error flag Set a bit rate. Set to 100b when transfer data is 7 bits long. Set to 101b when transfer data is 8 bits long. Set to 110b when transfer data is 9 bits long. Select the internal clock or external clock. Select the stop bit. Select whether parity is included and whether odd or even. Select the count source for the U0BRG register. Transmit register empty flag Select TXD0 pin output mode. Set to 0. Select LSB first or MSB first when transfer data is 8 bits long. Set to 0 when transfer data is 7 bits or 9 bits long. Set to 1 to enable transmission. Transmit buffer empty flag Set to 1 to enable reception. Receive complete flag Select the UART0 transmit interrupt source. Set to 0.
U0C0
CKDIR STPS PRY, PRYE CLK0, CLK1 TXEPT NCH CKPOL UFORM TE TI RE RI U0IRS U0RRM
U0C1
Notes: 1. The bits used for transmission/receive data are as follows: - Bits b0 to b6 when transfer data is 7 bits long - Bits b0 to b7 when transfer data is 8 bits long - Bits b0 to b8 when transfer data is 9 bits long 2. The contents of the following are undefined: - Bits 7 and 8 when the transfer data is 7 bits long - Bit 8 when the transfer data is 8 bits long
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21. Serial Interface (UART0)
Table 21.7 lists the I/O Pin Functions in UART Mode. After the UART0 operating mode is selected, the TXD0 pin outputs a "H" level until transfer starts. (If the NCH bit is set to 1 (N-channel open-drain output), this pin is in the high-impedance state.) Table 21.7 Pin name TXD0 (P1_4) I/O Pin Functions in UART Mode Selection Method TXD0SEL0 bit in U0SR register = 1 For reception only: P1_4 can be used as a port by setting TXD0SEL0 bit = 0. Serial data input RXD0SEL0 bit in U0SR register = 1 PD1_5 bit in PD1 register = 0 For transmission only: P1_5 can be used as a port by setting RXD0SEL0 bit = 0. Programmable I/O port CLK0SEL0 bit in U0SR register = 0 (CLK0 pin not used) Transfer clock input CLK0SEL0 bit in U0SR register = 1 CKDIR bit in U0MR register = 1 PD1_6 bit in PD1 register = 0 Function Serial data output
RXD0 (P1_5)
CLK0 (P1_6)
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21. Serial Interface (UART0)
* Transmit Timing Example When Transfer Data 8 Bits is Long (Parity Enabled, One Stop Bit)
TC
Transfer clock
TE bit in 1 U0C1 register 0 Data is set in U0TB register. TI bit in 1 U0C1 register 0 Data transfer from U0TB register to UART0 transmit register
Start bit Parity Stop bit bit
Pulsing stops because TE bit is set to 0.
TXD0
ST
D0
D1
D2
D3
D4
D5
D6
D7
P
SP
ST
D0
D1
D2
D3
D4
D5
D6
D7
P
SP
ST
D0
D1
TXEPT bit in 1 U0C0 register 0
IR bit in 1 S0TIC register 0 Set to 0 when an interrupt request is acknowledged or by a program.
The above applies when: * PRYE bit in U0MR register = 1 (parity enabled) * STPS bit in U0MR register = 0 (one stop bit) * U0IRS bit in U0C1 register = 1 (interrupt request generation when transmission is completed)
TC = 16 (n + 1) / fj or 16 (n + 1) / fEXT fj: Frequency of U0BRG count source (f1, f8, f32, fC) fEXT: Frequency of U0BRG count source (external clock) n: Setting value in U0BRG register
* Transmit Timing Example When Transfer Data is 9 Bits Long (Parity Disabled, Two Stop Bits)
TC
Transfer clock
TE bit in U0C1 register TI bit in U0C1 register
1 0 Data is set in U0TB register. 1 0 Data transfer from U0TB register to UART0 transmit register
Start bit
Stop Stop bit bit
TXD0
ST
D0
D1
D2
D3
D4
D5
D6
D7
D8
SP SP
ST
D0
D1
D2
D3
D4
D5
D6
D7
D8
SP SP
ST
D0
D1
TXEPT bit in U0C0 register
1 0
IR bit in 1 S0TIC register 0 Set to 0 when an interrupt request is acknowledged or by a program.
The above applies when: * PRYE bit in U0MR register = 0 (parity disabled) * STPS bit in U0MR register = 1 (two stop bits) * U0IRS bit in U0C1 register = 0 (interrupt request generation when the transmit buffer is empty)
TC = 16 (n + 1) / fj or 16 (n + 1) / fEXT fj: Frequency of U0BRG count source (f1, f8, f32, fC) fEXT: Frequency of U0BRG count source (external clock) n: Setting value in U0BRG register
Figure 21.6
Transmit Timing in UART Mode
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21. Serial Interface (UART0)
* Receive Timing Example When Transfer Data is 8 Bits Long (Parity Disabled, One Stop Bit)
U0BRG output
RE bit in U0C1 register RXD0
1 0
Stop bit Start bit D0 D1 D7
"L" is determined. Transfer clock
Receive data taken in
Reception starts when a transfer clock is generated at the falling edge of the start bit. RI bit in U0C1 register IR bit in S0RIC register
1 0 1 0
Data transfer from UART0 receive register to U0RB register
Set to 0 when an interrupt request is acknowledged or by a program. The above applies when : * PRYE bit in U0MR register = 0 (parity disabled) * STPS bit in U0MR register = 0 (one stop bit)
Figure 21.7
Receive Timing in UART Mode
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21. Serial Interface (UART0)
21.4.1
Bit Rate
In UART mode, the bit rate is the frequency divided by the U0BRG register and divided by 16.
UART mode * Internal clock selected Setting value in U0BRG register = fj Bit Rate x 16 -1
fj: Count source frequency of U0BRG register (f1, f8, f32, or fC)
* External clock selected
Setting value in U0BRG register =
fEXT Bit Rate x 16
-1
fEXT: Count source frequency of U0BRG register (external clock)
Figure 21.8
Formula for Calculating Setting Value in U0BRG Register
Table 21.8
Bit Rate (bps) 1200 2400 4800 9600 14400 19200 28800 38400 57600 115200
Bit Rate Setting Example in UART Mode (Internal Clock Selected)
System Clock = 20 MHz U0BRG Actual Setting Setting Time Error Value (bps) (%) 129 (81h) 1201.92 0.16 64 (40h) 2403.85 0.16 32 (20h) 4734.85 -1.36 129 (81h) 9615.38 0.16 86 (56h) 14367.82 -0.22 64 (40h) 19230.77 0.16 42 (2Ah) 29069.77 0.94 32 (20h) 37878.79 -1.36 21 (15h) 56818.18 -1.36 10 (0Ah) 113636.36 -1.36 System Clock = 18.432 MHz (1) U0BRG Actual Setting Setting Time Error Value (bps) (%) 119 (77h) 1200.00 0.00 59 (3Bh) 2400.00 0.00 29 (1Dh) 4800.00 0.00 119 (77h) 9600.00 0.00 79 (4Fh) 14400.00 0.00 59 (3Bh) 19200.00 0.00 39 (27h) 28800.00 0.00 29 (1Dh) 38400.00 0.00 19 (13h) 57600.00 0.00 9 (09h) 115200.00 0.00 System Clock = 8 MHz U0BRG Actual Setting Setting Time Error Value (bps) (%) 51 (33h) 1201.92 0.16 25 (19h) 2403.85 0.16 12 (0Ch) 4807.69 0.16 51 (33h) 9615.38 0.16 34 (22h) 14285.71 -0.79 25 (19h) 19230.77 0.16 16 (10h) 29411.76 2.12 12 (0Ch) 38461.54 0.16 8 (08h) 55555.56 -3.55 - - -
U0BRG Count Source f8 f8 f8 f1 f1 f1 f1 f1 f1 f1
Note: 1. For the high-speed on-chip oscillator, the correction value in the FRA4 register should be written into the FRA1 register and the correction value in the FRA5 register should be written into the FRA3 register. This applies when the high-speed on-chip oscillator is selected as the system clock and bits FRA22 to FRA20 in the FRA2 register are set to 000b (divide-by-2 mode). For the precision of the high-speed on-chip oscillator, refer to 32. Electrical Characteristics.
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21. Serial Interface (UART0)
21.5
Notes on Serial Interface (UART0)
* When reading data from the U0RB register either in clock synchronous serial I/O mode or in clock asynchronous
serial I/O mode, always read data in 16-bit units. When the high-order byte of the U0RB register is read, bits PER and FER in the U0RB register and the RI bit in the U0C1 register are set to 0. To check receive errors, read the U0RB register and then use the read data. Program example to read the receive buffer register: MOV.W 00A6H,R0 ; Read the U0RB register
* When writing data to the U0TB register in clock asynchronous serial I/O mode with 9-bit transfer data length,
write data to the high-order byte first and then the low-order byte, in 8-bit units. Program example to write to the transmit buffer register: MOV.B #XXH,00A3H ; Write to the high-order byte of the U0TB register MOV.B #XXH,00A2H ; Write to the low-order byte of the U0TB register
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22. Serial Interface (UART2)
22. Serial Interface (UART2)
The serial interface consists of three channels, UART0 to UART2. This chapter describes the UART2.
22.1
Overview
UART2 has a dedicated timer to generate a transfer clock and operate independently. Figure 22.1 shows a UART2 Block Diagram. Figure 22.2 shows a Block Diagram of UART2 Transmit/Receive Unit. Table 22.1 lists the Pin Configuration of UART2. UART2 has the following modes: * * * * Clock synchronous serial I/O mode Clock asynchronous serial I/O mode (UART mode) Special mode 1 (I2C mode) Multiprocessor communication function
DF2EN = 1
RXD2
DF2EN = 0
Digital filter
RXD polarity switching circuit 1/16 UART reception SMD2 to SMD0
TXD polarity switching circuit (1) Receive clock
TXD2
Clock source selection
CLK1 to CLK0 f1 = 01b f8 = 10b f32 = 11b fC
= 00b CKDIR CKDIR internal =0
= 010b, 100b, 101b, 110b = 001b
Reception control circuit
U2BRG register
Clock synchronous type 1/16 UART transmission
= 010b, 100b, 101b, 110b = 001b
Transmit/ receive unit
1/(n+1)
CKDIR =1 CKDIR external
Transmission control circuit
Transmit clock
Clock synchronous type Clock synchronous type (internal clock selected) 1/2
CKDIR = 0
CKDIR = 1
CKPOL
CLK
Clock synchronous type (internal clock selected)
Clock synchronous type (external clock selected)
CLK2
polarity switching circuit CTS/RTS disabled CTS/RTS selected
RTS2 CTS2
CTS2/RTS2
CRS = 1 CRS = 0 CRD = 0 CRD = 1
CTS/RTS disabled
VSS
SMD2 to SMD0, CKDIR: Bits in U2MR register CLK1, CLK0, CKPOL, CRD, CRS: Bits in U2C0 register DF2EN: Bit in URXDF register
n: Setting value in U2BRG register
Figure 22.1
UART2 Block Diagram
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22. Serial Interface (UART2)
RXD2
RXD data inversion circuit
Not inverted
IOPOL = 0 IOPOL = 1
Inverted
Clock synchronous type
1SP
STPS = 0
PAR Clock disabled synchronous PRYE = 0 type
I 2C
UART (7 bits) UART (8 bits) UART (7 bits)
UART2 receive register
SP
STPS = 1
SP 2SP
PAR
PRYE = 1 PAR enabled UART
I2C
UART (9 bits)
I 2C Clock synchronous type UART
(8 bits) UART (9 bits)
0
0
0
0
0
0
0
D8
D7
D6
D5
D4
D3
D2
D1
D0
U2RB register
Logic inversion circuit + MSB/LSB conversion circuit
Data bus high-order bits Data bus low-order bits
Logic inversion circuit + MSB/LSB conversion circuit
D8
D7
D6
D5
D4
D3
D2
D1
D0
U2TB register
UART (8 bits) UART (9 bits)
I 2C 2SP
STPS = 1 PAR enabled UART PRYE = 1 SMD = 1 UART (9 bits)
I 2C
Clock synchronous type
SP
SP
STPS = 0
PAR
1SP
SMD = 0 PRYE = 0 I 2C PAR Clock disabled
UART2 transmit register
UART (7 bits) UART (8 bits)
synchronous type
UART (7 bits)
Error signal output disabled Not inverted IOPOL = 0 U2ERE = 0
Clock synchronous type
TXD2
SP: Stop bit PAR: Parity bit SMD2 to SMD0, STPS, PRYE, IOPOL, CKDIR: Bits in U2MR register CLK1, CLK0, CKPOL, CRD, CRS: Bits in U2C0 register U2ERE: Bit in U2C1 register
U2ERE = 1 IOPOL = 1 Inverted Error signal output enabled
Error signal output circuit
TXD data inversion circuit
Figure 22.2
Block Diagram of UART2 Transmit/Receive Unit
Table 22.1
Pin Configuration of UART2 I/O Output Input I/O Input Output I/O I/O Function Serial data output Serial data input Transfer clock I/O Transmit control input Receive control input I2C mode clock I/O I2C mode data I/O
Pin Name Assigned Pin TXD2 P3_4 or P3_7 RXD2 P3_4, P3_7, or P4_5 CLK2 P3_5 P3_3 CTS2 RTS2 SCL2 SDA2 P3_3 P3_4, P3_7, or P4_5 P3_4 or P3_7
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Preliminary specification Specifications in this manual are tentative and subject to change.
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22. Serial Interface (UART2)
22.2 22.2.1
Registers UART2 Transmit/Receive Mode Register (U2MR)
b6 PRYE 0 b5 PRY 0 b4 STPS 0 b3 CKDIR 0 b2 SMD2 0 b1 SMD1 0 Function
b2 b1 b0
Address 00A8h Bit b7 Symbol IOPOL After Reset 0 Bit b0 b1 b2 Symbol SMD0 SMD1 SMD2
b0 SMD0 0 R/W R/W R/W R/W
Bit Name Serial I/O mode select bit
b3 b4 b5
CKDIR STPS PRY
Internal/external clock select bit Stop bit length select bit Odd/even parity select bit
b6 b7
PRYE IOPOL
Parity enable bit TXD, RXD I/O polarity switch bit
0 0 0: Serial interface disabled 0 0 1: Clock synchronous serial I/O mode 0 1 0: I2C mode 1 0 0: UART mode, transfer data 7 bits long 1 0 1: UART mode, transfer data 8 bits long 1 1 0: UART mode, transfer data 9 bits long Other than above: Do not set. 0: Internal clock 1: External clock 0: One stop bit 1: Two stop bits Enabled when PRYE = 1 0: Odd parity 1: Even parity 0: Parity disabled 1: Parity enabled 0: Not inverted 1: Inverted
R/W R/W R/W
R/W R/W
22.2.2
UART2 Bit Rate Register (U2BRG)
b6 -- X b5 -- X b4 -- X b3 -- X b2 -- X b1 -- X b0 -- X Setting Range 00h to FFh R/W W
Address 00A9h Bit b7 Symbol -- After Reset X
Bit Function b7 to b0 If the setting value is n, U2BRG divides the count source by n+1.
Write to the U2BRG register while transmission and reception stop. Use the MOV instruction to write to this register. Set bits CLK1 to CLK0 in the U2C0 register before writing to the U2BRG register.
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Preliminary specification Specifications in this manual are tentative and subject to change.
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22. Serial Interface (UART2)
22.2.3
UART2 Transmit Buffer Register (U2TB)
b5 -- X b13 -- X b4 -- X b12 -- X b3 -- X b11 -- X b2 -- X b10 -- X b1 -- X b9 -- X b0 -- X b8 MPTB X R/W W
Address 00ABh to 00AAh Bit b7 b6 Symbol -- -- After Reset X X Bit Symbol After Reset Bit b0 b1 b2 b3 b4 b5 b6 b7 b8 b15 -- X b14 -- X
Symbol -- -- -- -- -- -- -- -- MPTB
Function Transmit data (D7 to D0)
b9 b10 b11 b12 b13 b14 b15
-- -- -- -- -- -- --
Transmit data (D8) (1) [When the multiprocessor communication function is not used] Transmit data (D8) [When the multiprocessor communication function is used] * To transfer an ID, set the MPTB bit to 1. * To transfer data, set the MPTB bit to 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0.
W
--
Note: 1. Set bits b0 to b7 after setting the MPTB bit.
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Preliminary specification Specifications in this manual are tentative and subject to change.
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22. Serial Interface (UART2)
22.2.4
UART2 Transmit/Receive Control Register 0 (U2C0)
b6 CKPOL 0 b5 NCH 0 b4 CRD 0 b3 TXEPT 1 b2 CRS 0 b1 CLK1 0 Function
b1 b0
Address 00ACh Bit b7 Symbol UFORM After Reset 0 Bit b0 b1 Symbol CLK0 CLK1
b0 CLK0 0 R/W R/W R/W
Bit Name U2BRG count source select bit (1)
b2
CRS
CTS/RTS function select bit
b3
TXEPT
Transmit register empty flag
0 0: f1 selected 0 1: f8 selected 1 0: f32 selected 1 1: fC selected Enabled when CRD = 0 0: CTS function selected 1: RTS function selected 0: Data present in the transmit register (transmission in progress) 1: No data in the transmit register (transmission completed) 0: CTS/RTS function enabled 1: CTS/RTS function disabled 0: Pins TXD2/SDA2, SCL2 set to CMOS output 1: Pins TXD2/SDA2, SCL2 set to N-channel open-drain output 0: Transmit data output at the falling edge and receive data input at the rising edge of the transfer clock 1: Transmit data output at the rising edge and receive data input at the falling edge of the transfer clock 0: LSB first 1: MSB first
R/W
R
b4 b5
CRD NCH
CTS/RTS disable bit Data output select bit
R/W R/W
b6
CKPOL CLK polarity select bit
R/W
b7
UFORM Transfer format select bit (2)
R/W
Notes: 1. If bits CLK1 to CLK0 are switched, set the U2BRG register again. 2. The UFORM bit is enabled when bits SMD2 to SMD0 in the U2MR register are set to 001b (clock synchronous serial I/O mode), or set to 101b (UART mode, transfer data 8 bits long). Set the UFORM bit to 1 when bits SMD2 to SMD0 are set to 010b (I2C mode), and to 0 when bits SMD2 to SMD0 are set to 100b (UART mode, transfer data 7 bits long) or 110b (UART mode, transfer data 9 bits long).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
22. Serial Interface (UART2)
22.2.5
UART2 Transmit/Receive Control Register 1 (U2C1)
b6 U2LCH 0 b5 U2RRM 0 b4 U2IRS 0 b3 RI 0 b2 RE 0 b1 TI 1 b0 TE 0 R/W R/W R R/W R R/W R/W R/W R/W
Address 00ADh Bit b7 Symbol U2ERE After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol TE TI RE RI U2IRS
Bit Name Transmit enable bit Transmit buffer empty flag Receive enable bit Receive complete flag
UART2 transmit interrupt source select bit U2RRM UART2 continuous receive mode enable bit U2LCH Data logic select bit (1) U2ERE Error signal output enable bit
Function 0: Transmission disabled 1: Transmission enabled 0: Data present in the U2TB register 1: No data in the U2TB register 0: Reception disabled 1: Reception enabled 0: No data in the U2RB register 1: Data present in the U2RB register 0: Transmit buffer empty (TI = 1) 1: Transmission completed (TXEPT = 1) 0: Continuous receive mode disabled 1: Continuous receive mode enabled 0: Not inverted 1: Inverted 0: Output disabled 1: Output enabled
Note: 1. The U2LCH bit is enabled when bits SMD2 to SMD0 in the U2MR register are set to 001b (clock synchronous serial I/O mode), 100b (UART mode, transfer data 7 bits long), or 101b (UART mode, transfer data 8 bits long). Set the U2LCH bit to 0 when bits SMD2 to SMD0 are set to 010b (I2C mode) or 110b (UART mode, transfer data 9 bits long).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
22. Serial Interface (UART2)
22.2.6
UART2 Receive Buffer Register (U2RB)
b5 -- X b13 FER X Bit Name -- b4 -- X b12 OER X b3 -- X b11 ABT X b2 -- X b10 -- X b1 -- X b9 -- X b0 -- X b8 MPRB X R/W R
Address 00AFh to 00AEh Bit b7 b6 Symbol -- -- After Reset X X Bit Symbol After Reset Bit b0 b1 b2 b3 b4 b5 b6 b7 b8 b15 SUM X b14 PER X
Symbol -- -- -- -- -- -- -- -- MPRB
Function Receive data (D7 to D0)
--
b9 b10 b11 b12 b13 b14 b15
-- -- ABT OER FER PER SUM
Receive data (D8) (2) [When the multiprocessor communication function is not used] Receive data (D8) [When the multiprocessor communication function is used] * When the MPRB bit is set to 0, received D0 to D7 are data fields. * When the MPRB bit is set to 1, received D0 to D7 are ID fields. Nothing is assigned. If necessary, set to 0. When read, the content is 0. 0: Not detected (Won) 1: Detected (Lost) 0: No overrun error 1: Overrun error 0: No framing error 1: Framing error 0: No parity error 1: Parity error 0: No error 1: Error
R
-- R R R R R
Arbitration lost detect flag (1) Overrun error flag (2) Framing error flag (2, 3) Parity error flag (2, 3) Error sum flag (2, 3)
Notes: 1. The ABT bit is set to 0 by writing 0 by a program. (Writing 1 has no effect.) 2. When bits SMD2 to SMD0 in the U2MR register are set to 000b (serial interface disabled) or the RE bit in the U2C1 register is set to 0 (reception disabled), all of bits SUM, PER, FER, and OER are set to 0 (no error). The SUM bit is set to 0 (no error) when all of bits PER, FER, and OER are set to 0 (no error). Bits PER and FER are set to 0 by reading the lower byte of the U2RB register. 3. These error flags are disabled when bits SMD2 to SMD0 in the U2MR register are set to 001b (clock synchronous serial I/O mode) or to 010b (I2C mode). When read, the content is undefined.
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Preliminary specification Specifications in this manual are tentative and subject to change.
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22. Serial Interface (UART2)
22.2.7
UART2 Digital Filter Function Select Register (URXDF)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 DF2EN 0 b1 -- 0 b0 -- 0 R/W -- R/W --
Address 00B0h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- DF2EN RXD2 digital filter enable bit (1) 0: RXD2 digital filter disabled 1: RXD2 digital filter enabled -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- -- --
Note: 1. The RXD2 digital filter can be used only in clock asynchronous serial I/O (UART) mode. When bits SMD2 to SMD0 in the U2MR register are set to 001b (clock synchronous serial I/O mode) or 010b (I2C mode), set the DF2EN bit to 0 (RXD2 digital filter disabled).
22.2.8
UART2 Special Mode Register 5 (U2SMR5)
b6 -- 0 b5 -- 0 b4 MPIE 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 MP 0 R/W R/W --
Address 00BBh Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4
b5 b6 b7
Symbol Bit Name Function MP Multiprocessor communication 0: Multiprocessor communication disabled enable bit 1: Multiprocessor communication enabled (1) -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- MPIE Multiprocessor communication This bit is enabled when the MP bit is set to 1 control bit (multiprocessor communication enabled). When the MPIE bit is set to 1, the following will result: * Receive data in which the multiprocessor bit is 0 is ignored. Setting of the RI bit in the U2C1 register and bits OER and FER in the U2RB register to 1 is disabled. * On receiving receive data in which the multiprocessor bit is 1, the MPIE bit is set to 0 and receive operation other than multiprocessor communication is performed. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- Reserved bit Set to 0.
R/W
-- R/W
Note: 1. When the MP bit is set to 1 (multiprocessor communication enabled), the settings of bits PRY and PRYE in the U2MR register are disabled. If bits SMD2 to SMD0 in the U2MR register are set to 001b (clock synchronous serial I/O mode), set the MP bit to 0 (multiprocessor communication disabled).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
22. Serial Interface (UART2)
22.2.9
UART2 Special Mode Register 4 (U2SMR4)
b6 SCLHI 0 b5 ACKC 0 b4 ACKD 0 b3 b2 b1 b0 STSPSEL STPREQ RSTAREQ STAREQ 0 0 0 0 Function 0: Clear 1: Start 0: Clear 1: Start 0: Clear 1: Start 0: Start and stop conditions not output 1: Start and stop conditions output 0: ACK 1: NACK 0: Serial interface data output 1: ACK data output 0: Disabled 1: Enabled 0: SCL "L" hold disabled 1: SCL "L" hold enabled R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 00BCh Bit b7 Symbol SWC9 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name STAREQ Start condition generate bit (1) RSTAREQ Restart condition generate bit (1) STPREQ Stop condition generate bit (1) STSPSEL SCL, SDA output select bit ACKD ACKC SCLHI SWC9 ACK data bit ACK data output enable bit SCL output stop enable bit SCL wait bit 3
Note: 1. This bit is set to 0 when each condition is generated.
22.2.10 UART2 Special Mode Register 3 (U2SMR3)
Address 00BDh Bit b7 Symbol DL2 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 b6 DL1 0 b5 DL0 0 b4 -- X b3 NODC 0 b2 -- X b1 CKPH 0 b0 -- X R/W -- R/W -- R/W -- R/W R/W R/W
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is undefined. CKPH Clock phase set bit 0: No clock delay 1: With clock delay -- Nothing is assigned. If necessary, set to 0. When read, the content is undefined. NODC Clock output select bit 0: CLK2 set to CMOS output 1: CLK2 set to N-channel open-drain output -- Nothing is assigned. If necessary, set to 0. When read, the content is undefined. b7 b6 b5 DL0 SDA2 digital delay setup bit (1, 2) 0 0 0: No delay DL1 0 0 1: 1 to 2 cycle(s) of U2BRG count source DL2 0 1 0: 2 to 3 cycles of U2BRG count source 0 1 1: 3 to 4 cycles of U2BRG count source 1 0 0: 4 to 5 cycles of U2BRG count source 1 0 1: 5 to 6 cycles of U2BRG count source 1 1 0: 6 to 7 cycles of U2BRG count source 1 1 1: 7 to 8 cycles of U2BRG count source
Notes: 1. Bits DL2 to DL0 are used to generate a delay in SDA2 output digitally in I2C mode. In other than I2C mode, set these bits to 000b (no delay). 2. The amount of delay varies with the load on pins SCL2 and SDA2. When an external clock is used, the amount of delay increases by about 100 ns.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
22. Serial Interface (UART2)
22.2.11 UART2 Special Mode Register 2 (U2SMR2)
Address 00BEh Bit b7 Symbol -- After Reset X Bit b0 b1 b2 b3 b4 b5 b6 b7 b6 SDHI 0 b5 SWC2 0 b4 STAC 0 b3 ALS 0 b2 SWC 0 b1 CSC 0 b0 IICM2 0 R/W R/W R/W R/W R/W R/W R/W R/W --
Symbol Bit Name IICM2 I2C mode select bit 2 CSC Clock synchronization bit SWC ALS STAC SWC2 SDHI --
Function Refer to Table 22.12 I2C Mode Functions. 0: Disabled 1: Enabled SCL wait output bit 0: Disabled 1: Enabled SDA output stop bit 0: Disabled 1: Enabled UART2 initialization bit 0: Disabled 1: Enabled SCL wait output bit 2 0: Transfer clock 1: "L" output SDA output disable bit 0: Enabled 1: Disabled (high-impedance) Nothing is assigned. If necessary, set to 0. When read, the content is undefined.
22.2.12 UART2 Special Mode Register (U2SMR)
Address 00BFh Bit b7 Symbol -- After Reset X Bit b0 b1 b2 b3 b4 b5 b6 b7 b6 SSS 0 b5 ACSE 0 b4 ABSCS 0 b3 -- 0 b2 BBS 0 b1 ABC 0 b0 IICM 0 R/W R/W R/W R/W R/W R/W R/W R/W --
Function 0: Other than I2C mode 1: I2C mode ABC Arbitration lost detect flag control bit 0: Update per bit 1: Update per byte BBS 0: Stop condition detected Bus busy flag (1) 1: Start condition detected (busy) -- Reserved bit Set to 0. ABSCS Bus collision detect sampling clock 0: Rising edge of transfer clock select bit 1: Underflow signal of Timer RA (2) ACSE Auto clear function select bit of 0: No auto clear function transmit enable bit 1: Auto clear at bus collision occurrence SSS Transmit start condition select bit 0: Not synchronized to RXD2 1: Synchronized to RXD2 (2) -- Nothing is assigned. If necessary, set to 0. When read, the content is undefined.
Symbol Bit Name IICM I2C mode select bit
Notes: 1. The BBS bit is set to 0 by writing 0 by a program (Writing 1 has no effect). 2. When a transfer begins, the SSS bit is set to 0 (not synchronized to RXD2).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
22. Serial Interface (UART2)
22.2.13 UART2 Pin Select Register 0 (U2SR0)
Address 018Ah Bit b7 Symbol -- After Reset 0 Bit b0 b1 b6 -- 0 b5 b4 RXD2SEL1 RXD2SEL0 0 0 b3 -- 0 b2 -- 0 b1 b0 TXD2SEL1 TXD2SEL0 0 0 Function
b1 b0
b2 b3 b4 b5
b6 b7
0 0: TXD2/SDA2 pin not used 0 1: P3_7 assigned 1 0: P3_4 assigned 1 1: Do not set. -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. b5 b4 RXD2SEL0 RXD2/SCL2 pin select bit 0 0: RXD2/SCL2 pin not used RXD2SEL1 0 1: P3_4 assigned 1 0: P3_7 assigned 1 1: P4_5 assigned -- Reserved bit Set to 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Symbol Bit Name TXD2SEL0 TXD2/SDA2 pin select bit TXD2SEL1
R/W R/W R/W
R/W -- R/W R/W
R/W --
The U2SR0 register selects which pin is assigned to the UART2 I/O. To use the I/O pin for UART2, set this register. Set the U2SR0 register before setting the UART2 associated registers. Also, do not change the setting value in this register during UART2 operation.
22.2.14 UART2 Pin Select Register 1 (U2SR1)
Address 018Bh Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 b6 -- 0 b5 -- 0 b4 CTS2SEL0 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 CLK2SEL0 0 R/W R/W R/W -- R/W R/W -- R/W
Symbol Bit Name CLK2SEL0 CLK2 pin select bit
-- -- -- CTS2SEL0 CTS2/RTS2 pin select bit -- -- --
Function 0: CLK2 pin not used 1: P3_5 assigned Reserved bit Set to 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0. 0: CTS2/RTS2 pin not used 1: P3_3 assigned Reserved bit Set to 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0. Reserved bit Set to 0.
The U2SR1 register selects which pin is assigned to the UART2 I/O. To use the I/O pin for UART2, set this register. Set the U2SR1 register before setting the UART2 associated registers. Also, do not change the setting value in this register during UART2 operation.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
22. Serial Interface (UART2)
22.3
Clock Synchronous Serial I/O Mode
In clock synchronous serial I/O mode, data is transmitted and received using a transfer clock. Table 22.2 lists the Clock Synchronous Serial I/O Mode Specifications. Table 22.3 lists the Registers Used and Settings in Clock Synchronous Serial I/O Mode. Table 22.2 Clock Synchronous Serial I/O Mode Specifications
Specification Transfer data length: 8 bits * The CKDIR bit in the U2MR register is set to 0 (internal clock): fj/(2(n+1)) fj = f1, f8, f32, fC n = setting value in the U2BRG register: 00h to FFh * The CKDIR bit is set to 1 (external clock): Input from the CLK2 pin Selectable from the CTS function, RTS function, or CTS/RTS function disabled. To start transmission, the following requirements must be met: (1) * The TE bit in the U2C1 register is set to 1 (transmission enabled) * The TI bit in the U2C1 register is set to 0 (data present in the U2TB register) * If the CTS function is selected, input to the CTS2 pin = "L". To start reception, the following requirements must be met: (1) * The RE bit in the U2C1 register is set to 1 (reception enabled). * The TE bit in the U2C1 register is set to 1 (transmission enabled). * The TI bit in the U2C1 register is set to 0 (data present in the U2TB register). For transmission, one of the following conditions can be selected. * The U2IRS bit in the U2C1 register is set to 0 (transmit buffer empty): When data is transferred from the U2TB register to the UART2 transmit register (at start of transmission). * The U2IRS bit is set to 1 (transmission completed): When data transmission from the UART2 transmit register is completed. For reception * When data is transferred from the UART2 receive register to the U2RB register (at completion of reception). Overrun error (2) This error occurs if the serial interface starts receiving the next unit of data before reading the U2RB register and receives the 7th bit of the next unit of data. * CLK polarity selection Transfer data I/O can be selected to occur synchronously with the rising or falling edge of the transfer clock. * LSB first, MSB first selection Whether transmitting or receiving data begins with bit 0 or begins with bit 7 can be selected. * Continuous receive mode selection Reception is enabled immediately by reading the U2RB register. * Serial data logic switching This function inverts the logic value of the transmit/receive data.
Item Transfer data format Transfer clock
Transmit/receive control Transmit start conditions
Receive start conditions
Interrupt request generation timing
Error detection
Selectable functions
Notes: 1. When an external clock is selected, the requirements must be met in either of the following states: - The external clock is held high when the CKPOL bit in the U2C0 register is set to 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock) - The external clock is held low when the CKPOL bit in the U2C0 register is set to 1 (transmit data output at the rising edge and receive data input at the falling edge of the transfer clock) 2. If an overrun error occurs, the receive data in the U2RB register will be undefined. The IR bit in the S2RIC register does not change to 1 (interrupt requested).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
22. Serial Interface (UART2)
Table 22.3 Register U2TB
(1)
Registers Used and Settings in Clock Synchronous Serial I/O Mode Bit b0 to b7 b0 to b7 OER b0 to b7 SMD2 to SMD0 CKDIR IOPOL CLK1, CLK0 CRS TXEPT CRD NCH CKPOL UFORM TE TI RE RI U2IRS U2RRM U2LCH U2ERE b0 to b7 b0 to b7 b0 to b2 NODC b4 to b7 b0 to b7 DF2EN MP Set transmit data. Receive data can be read. Overrun error flag Set a bit rate. Set to 001b. Select the internal clock or external clock. Set to 0. Select the count source for the U2BRG register. Select either CTS or RTS to use functions. Transmit register empty flag Enable or disable the CTS or RTS function. Select TXD2 pin output mode. Select the transfer clock polarity. Select LSB first or MSB first. Set to 1 to enable transmission/reception. Transmit buffer empty flag Set to 1 to enable reception. Receive complete flag Select the source of UART2 transmit interrupt. Set to 1 to use continuous receive mode. Set to 1 to use inverted data logic. Set to 0. Set to 0. Set to 0. Set to 0. Select clock output mode. Set to 0. Set to 0. Set to 0. Set to 0. Function
U2RB (1) U2BRG U2MR (1)
U2C0
U2C1
U2SMR U2SMR2 U2SMR3
U2SMR4 URXDF U2SMR5
Note: 1. Set the bits not listed in this table to 0 when writing to the above registers in clock synchronous serial I/O mode.
REJ09B0458-0010 Rev.0.10 Page 319 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
22. Serial Interface (UART2)
Table 22.4 lists the Pin Functions in Clock Synchronous Serial I/O Mode (Multiple Transfer Clock Output Pin Function Not Selected). Note that for a period from when UART2 operating mode is selected to when transfer starts, the TXD2 pin outputs a "H" level. (When N-channel open-drain output is selected, this pin is in the high-impedance state.) Figure 22.3 shows the Transmit and Receive Timing in Clock Synchronous Serial I/O Mode. Table 22.4 Pin Functions in Clock Synchronous Serial I/O Mode (Multiple Transfer Clock Output Pin Function Not Selected) Selection Method
* When TXD2 (P3_4) Bits TXD2SEL1 to TXD2SEL0 in U2SR0 register = 10b (P3_4) * When TXD2 (P3_7) Bits TXD2SEL1 to TXD2SEL0 in U2SR0 register = 01b (P3_7) * For reception only: P3_4 and P3_7 can be used as ports by setting TXD2SEL1 to TXD2SEL0 to 00b. RXD2 Serial data input * When RXD2 (P3_4) (P3_4, P3_7, or Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 01b (P3_4) P4_5) PD3_4 bit in PD3 register = 0 * When RXD2 (P3_7) Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 10b (P3_7) PD3_7 bit in PD3 register = 0 * When RXD2 (P4_5) Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 11b (P4_5) PD4_5 bit in PD4 register = 0 * For transmission only: P3_4, P3_7, and P4_5 can be used as ports by setting RXD2SEL1 to RXD2SEL0 to 00b. CLK2 (P3_5) Transfer clock output CLK2SEL0 bit in U2SR1 register = 1 CKDIR bit in U2MR register = 0 Transfer clock input CLK2SEL0 bit in U2SR1 register = 1 CKDIR bit in U2MR register = 1 PD3_5 bit in PD3 register = 0 CTS2SEL0 bit in U2SR1 register = 1 CTS2/RTS2 CTS input CRD bit in U2C0 register = 0 (P3_3) CRS bit in U2C0 register = 0 PD3_3 bit in PD3 register = 0 CTS2SEL0 bit in U2SR1 register = 1 RTS output CRD bit in U2C0 register = 0 CRS bit in U2C0 register = 1 I/O port CTS2SEL0 bit in U2SR1 register = 0
Pin Name Function TXD2 Serial data output (P3_4 or P3_7)
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22. Serial Interface (UART2)
(1) Transmit Timing Example (Internal Clock Selected)
TC Transfer clock TE bit in U2C1 register TI bit in U2C1 register CTS2
1 0 1 0 "H" "L" Data transfer from U2TB register to UART2 transmit register Data is set in U2TB register.
TCLK
Pulsing stops because "H" is applied to CTS2. Pulsing stops because TE bit is set to 0.
CLK2
TXD2 TXEPT flag in U2C0 register IR bit in S2TIC register
1 0 1 0
D0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
Set to 0 when an interrupt request is acknowledged or by a program. The above applies when: * CKDIR bit in U2MR register = 0 (internal clock) * CRD bit in U2C0 register = 0 (CTS/RTS function enabled), CRS bit = 0 (CTS function selected) * CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock) * U2IRS bit in U2C1 register = 0 (interrupt request generation when the U2TB register is empty) TC = TCLK = 2(n+1)/fj fj: Frequency of U2BRG count source (f1, f8, f32, fC) n: Setting value in U2BRG register
(2) Receive Timing Example (External Clock Selected)
RE bit in U2C1 register TE bit in U2C1 register TI bit in U2C1 register RTS2 CLK2
Received data taken in 1 0 1 0 1 0 "H" "L" Data transfer from U2TB register to UART2 transmit register Dummy data is set in U2TB register.
1/fEXT
"L" is applied when U2RB register is read.
RXD2 RI bit in U2C1 register IR bit in S2RIC register
D0 D1 D2 D3 D4 D5 D6 D7 Data transfer from UART2 receive 1 register to U2RB register 0 1 0
D0 D1 D2 D3 D4 D5 D6 Data read from U2RB register
D7
D0 D1 D2 D3 D4 D5 D6
Set to 0 when an interrupt request is acknowledged or by a program.
OER flag in U2RB register
1 0 Make sure the following conditions are met when the CLK2 pin input before receiving data is high: * TE bit in U2C0 register = 1 (transmission enabled) * RE bit in U2C1 register = 1 (reception enabled) * Dummy data is written to U2TB register
The above applies when: * CKDIR bit in U2MR register = 1 (external clock) * CRD bit in U2C0 register = 0 (CTS/RTS function enabled), CRS bit = 1 (RTS function selected) * CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock) fEXT: Frequency of external clock
Figure 22.3
Transmit and Receive Timing in Clock Synchronous Serial I/O Mode Apr 01, 2008
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22. Serial Interface (UART2)
22.3.1
Measure for Dealing with Communication Errors
If a communication error occurs while transmitting or receiving in clock synchronous serial I/O mode, follow the procedures below: * Resetting the U2RB register (1) Set the RE bit in the U2C1 register to 0 (reception disabled). (2) Set bits SMD2 to SMD0 in the U2MR register to 000b (serial interface disabled). (3) Set bits SMD2 to SMD0 in the U2MR register to 001b (clock synchronous serial I/O mode). (4) Set the RE bit in the U2C1 register to 1 (reception enabled). * Resetting the U2TB register (1) Set bits SMD2 to SMD0 in the U2MR register to 000b (serial interface disabled). (2) Set bits SMD2 to SMD0 in the U2MR register to 001b (clock synchronous serial I/O mode). (3) Write 1 to the TE bit in the U2C1 register (transmission enabled), regardless of the TE bit value in the U2C2 register.
22.3.2
CLK Polarity Select Function
Use the CKPOL bit in the U2C0 register to select the transfer clock polarity. Figure 22.4 shows the Transfer Clock Polarity.
(1) CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock)
CLK2 TXD2 RXD2 D0 D0 D1 D1 D2 D2 D3 D3 D4 D4 D5 D5 D6 D6
"H" output from CLK2 pin during no transfer
D7 D7
(2) CKPOL bit in U2C0 register = 1 (transmit data output at the rising edge and receive data input at the falling edge of the transfer clock)
"H" output from CLK2 pin during no transfer
CLK2 TXD2 RXD2 D0 D0 D1 D1 D2 D2 D3 D3 D4 D4 D5 D5 D6 D6 D7 D7
The above applies when: * UFORM bit in U2C0 register = 0 (LSB first) * U2LCH bit in U2C1 register = 0 (not inverted)
Figure 22.4
Transfer Clock Polarity
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22. Serial Interface (UART2)
22.3.3
LSB First/MSB First Select Function
Use the UFORM bit in the U2C0 register to select the transfer format. Figure 22.5 shows the Transfer Format.
(1) UFORM Bit in U2C0 Register = 0 (LSB first)
CLK2 TXD2 RXD2 D0 D0 D1 D1 D2 D2 D3 D3 D4 D4 D5 D5 D6 D6 D7 D7
(2) UFORM Bit in U2C0 Register = 1 (MSB first)
CLK2 TXD2 RXD2 D7 D7 D6 D6 D5 D5 D4 D4 D3 D3 D2 D2 D1 D1 D0 D0
The above applies when: * CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock) * U2LCH bit in U2C1 register = 0 (not inverted)
Figure 22.5
Transfer Format
22.3.4
Continuous Receive Mode
In continuous receive mode, receive operation is enabled when the receive buffer register is read. It is not necessary to write dummy data to the transmit buffer register to enable receive operation in this mode. However, a dummy read of the receive buffer register is required when starting the operating mode. When the U2RRM bit in the U2C1 register is set to 1 (continuous receive mode), the TI bit in the U2C1 register is set to 0 (data present in the U2TB register) by reading the U2RB register. If the U2RRM bit is set to 1, do not write dummy data to the U2TB register by a program.
REJ09B0458-0010 Rev.0.10 Page 323 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
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22. Serial Interface (UART2)
22.3.5
Serial Data Logic Switching Function
If the U2LCH bit in the U2C1 register is set to 1 (inverted), the data written to the U2TB register has its logic inverted before being transmitted. Similarly, the received data has its logic inverted when read from the U2RB register. Figure 22.6 shows the Serial Data Logic Switching.
(1) U2LCH Bit in U2C1 Register = 0 (not inverted)
Transfer Clock TXD2 (not inverted)
"H" "L" "H" "L"
D0
D1
D2
D3
D4
D5
D6
D7
(2) U2LCH Bit in U2C1 Register = 1 (inverted)
Transfer Clock TXD2 (inverted)
"H" "L" "H" "L"
D0
D1
D2
D3
D4
D5
D6
D7
The above applies when: * CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge of the transfer clock) * UFORM bit in U2C0 register = 0 (LSB first)
Figure 22.6
Serial Data Logic Switching
22.3.6
CTS/RTS Function
The CTS function is used to start transmit and receive operation when "L" is applied to the CTS2/RTS2 pin. Transmit and receive operation begins when the CTS2/RTS2 pin is held low. If the "L" signal is switched to "H" during a transmit or receive operation, the operation stops before the next data. For the RTS function, the CTS2/RTS2 pin outputs "L" when the MCU is ready for a receive operation. The output level goes high at the first falling edge of the CLK2 pin. * The CRD bit in the U2C0 register = 1 (CTS/RTS function disabled) The CTS2/RTS2 pin operates as the programmable I/O function. * The CRD bit = 0, CRS bit = 0 (CTS function selected) The CTS2/RTS2 pin operates as the CTS function. * The CRD bit = 0, CRS bit = 1 (RTS function selected) The CTS2/RTS2 pin operates as the RTS function.
REJ09B0458-0010 Rev.0.10 Page 324 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
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22. Serial Interface (UART2)
22.4
Clock Asynchronous Serial I/O (UART) Mode
In UART mode, data is transmitted and received after setting the desired bit rate and transfer data format. Table 22.5 lists the UART Mode Specifications. Table 22.6 lists the Registers Used and Settings in UART Mode. Table 22.5 UART Mode Specifications
Specification * Character bits (transfer data): Selectable from 7, 8, or 9 bits * Start bit:1 bit * Parity bit: Selectable from odd, even, or none * Stop bits: Selectable from 1 bit or 2 bits * The CKDIR bit in the U2MR register is set to 0 (internal clock): fj/(16(n + 1)) fj = f1, f8, f32, fC n = setting value in the U2BRG register: 00h to FFh * The CKDIR bit is set to 1 (external clock): fEXT/(16(n + 1)) fEXT: Input from CLK2 pin n: Setting value in the U2BRG register: 00h to FFh Selectable from the CTS function, RTS function, or CTS/RTS function disabled. To start transmission, the following requirements must be met: * The TE bit in the U2C1 register is set to 1 (transmission enabled). * The TI bit in the U2C1 register is set to 0 (data present in the U2TB register). * If the CTS function is selected, input to the CTS2 pin = "L". To start reception, the following requirements must be met: * The RE bit in the U2C1 register is set to 1 (reception enabled). * Start bit detection For transmission, one of the following conditions can be selected. * The U2IRS bit in the U2C1 register is set to 0 (transmit buffer empty): When data is transferred from the U2TB register to the UART2 transmit register (at start of transmission). * The U2IRS bit is set to 1 (transmission completed): When data transmission from the UART2 transmit register is completed. For reception * When data is transferred from the UART2 receive register to the U2RB register (at completion of reception). * Overrun error (1) This error occurs if the serial interface starts receiving the next unit of data before reading the U2RB register and receives the bit one before the last stop bit of the next unit of data. * Framing error (2) This error occurs when the set number of stop bits is not detected. * Parity error (2) This error occurs when if parity is enabled, the number of 1's in the parity and character bits does not match the set number of 1's. * Error sum flag This flag is set to 1 if an overrun, framing, or parity error occurs. * LSB first, MSB first selection Whether transmitting or receiving data begins with bit 0 or begins with bit 7 can be selected. * Serial data logic switching This function inverts the logic of the transmit/receive data. The start and stop bits are not inverted. * TXD, RXD I/O polarity switching This function inverts the polarities of the TXD pin output and RXD pin input. The logic levels of all I/O data are inverted. * RXD2 digital filter selection The RXD2 input signal can be enabled or disabled.
Item Transfer data format
Transfer clock
Transmit/receive control Transmit start conditions
Receive start conditions
Interrupt request generation timing
Error detection
Selectable functions
Notes: 1. If an overrun error occurs, the receive data in the U2RB register will be undefined. The IR bit in the S2RIC register remains unchanged. 2. The timing at which the framing error flag and the parity error flag are set is detected when data is transferred from the UART2 receive register to the U2RB register.
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22. Serial Interface (UART2)
Table 22.6 Register U2TB U2RB U2BRG U2MR
Registers Used and Settings in UART Mode Bit b0 to b8 b0 to b8 Set transmit data.
(1)
Function
U2C0
Receive data can be read. (1, 2) OER, FER, PER, SUM Error flag b0 to b7 Set a bit rate. SMD2 to SMD0 Set to 100b when transfer data is 7 bits long. Set to 101b when transfer data is 8 bits long. Set to 110b when transfer data is 9 bits long. CKDIR Select the internal clock or external clock. STPS Select the stop bit. PRY, PRYE Select whether parity is included and whether odd or even. IOPOL Select the TXD/RXD I/O polarity. CLK0, CLK1 Select the count source for the U2BRG register. CRS Select CTS or RTS to use functions. TXEPT CRD NCH CKPOL UFORM Transmit register empty flag Enable or disable the CTS or RTS function. Select TXD2 pin output mode. Set to 0. Select LSB first or MSB first when transfer data is 8 bits long. Set to 0 when transfer data is 7 or 9 bits long. Set to 1 to enable transmission. Transmit buffer empty flag Set to 1 to enable reception. Receive complete flag Select the UART2 transmit interrupt source. Set to 0. Set to 1 to use inverted data logic. Set to 0. Set to 0. Set to 0. Set to 0. Set to 0. Select the digital filter disabled or enabled. Set to 0.
U2C1
U2SMR U2SMR2 U2SMR3 U2SMR4 URXDF U2SMR5
TE TI RE RI U2IRS U2RRM U2LCH U2ERE b0 to b7 b0 to b7 b0 to b7 b0 to b7 DF2EN MP
Notes: 1. The bits used for transmit/receive data are as follows: - Bits b0 to b6 when transfer data is 7 bits long - Bits b0 to b7 when transfer data is 8 bits long - Bits b0 to b8 when transfer data is 9 bits long 2. The contents of the following are undefined: - Bits b7 and b8 when transfer data is 7 bits long - Bit b8 when transfer data is 8 bits long
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22. Serial Interface (UART2)
Table 22.7 lists the I/O Pin Functions in UART Mode. Note that for a period from when the UART2 operating mode is selected to when transfer starts, the TXD2 pin outputs "H". (When N-channel open-drain output is selected, this pin is in the high-impedance state.) Figure 22.7 shows the Transmit Timing in UART Mode. Figure 22.8 shows the Receive Timing in UART Mode. Table 22.7 I/O Pin Functions in UART Mode Selection Method * When TXD2 (P3_4) Bits TXD2SEL1 to TXD2SEL0 in U2SR0 register = 10b (P3_4) * When TXD2 (P3_7) Bits TXD2SEL1 to TXD2SEL0 in U2SR0 register = 01b (P3_7) * For reception only: P3_4 and P3_7 can be used as ports by setting TXD2SEL1 to TXD2SEL0 to 00b. * When RXD2 (P3_4) Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 01b (P3_4) * When RXD2 (P3_7) Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 10b (P3_7) PD3_7 bit in PD3 register = 0 * When RXD2 (P4_5) Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 11b (P4_5) PD4_5 bit in PD4 register = 0 * For transmission only: P3_4, P3_7, and P4_5 can be used as ports by setting RXD2SEL1 to RXD2SEL0 to 00b. CLK2SEL0 bit in U2SR1 register = 0 CLK2SEL0 bit in U2SR1 register = 1 CKDIR bit in U2MR register = 1 PD3_5 bit in PD3 register = 0 CTS2SEL0 bit in U2SR1 register = 1 CRD bit in U2C0 register = 0 CRS bit in U2C0 register = 0 PD3_3 bit in PD3 register = 0 CTS2SEL0 bit in U2SR1 register = 1 CRD bit in U2C0 register = 0 CRS bit in U2C0 register = 1 CTS2SEL0 bit in U2SR1 register = 0
Pin Name Function TXD2 Serial data output (P3_4 or P3_7)
RXD2 Serial data input (P3_4, P3_7, or P4_5)
CLK2 (P3_5)
I/O port Transfer clock input
CTS2/RTS2 (P3_3)
CTS input
RTS input
I/O port
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22. Serial Interface (UART2)
(1) Transmit Timing Example When Transfer Data 8 Bits is Long (Parity Enabled, One Stop Bit)
TC
Transfer clock TE bit in U2C1 register TI bit in U2C1 register
1 0 1 0
The transfer clock stops once because "H" is applied to CTS pin when the stop bit is verified. The transfer clock resumes running immediately after "L" is applied to CTS pin.
Data is set in U2TB register.
Data transfer from U2TB register to UART2 transmit register
"H"
CTS2
"L" Start bit Parity bit
D1 D2 D3 D4 D5 D6 D7 P SP
Stop bit
ST D0 D1 D2 D3 D4
Pulsing stops because TE bit is set to 0.
D5 D6 D7 P SP ST D0 D1
TXD2
TXEPT bit in U2C0 register IR bit in S2TIC register
1 0 1 0
ST
D0
Set to 0 when an interrupt request is acknowledged or by a program.
The above applies when: * PRYE bit in U2MR register = 1 (parity enabled) * STPS bit in U2MR register = 0 (one stop bit) * CRD bit in U2C0 register = 0 (CTS/RTS function enabled), CRS bit = 0 (CTS function selected) * U2IRS bit in U2C1 register = 1 (interrupt request generation when transmission is completed) TC = 16(n + 1)/fj or 16(n + 1)/fEXT fj: Frequency of U2BRG count source (f1, f8, f32, fC) fEXT: Frequency of U2BRG count source (external clock) n: Setting value in U2BRG
(2) Transmit Timing Example When Transfer Data 9 Bits is Long (Parity Disabled, Two Stop Bits) TC
Transfer clock TE bit in U2C1 register TI bit in U2C1 register
1 0 1 0 Stop bit
D1 D2 D3 D4 D5 D6 D7 D8 SP SP
Data is set in U2TB register.
Data transfer from U2TB register to UART2 transmit register
Start bit Stop bit
ST D0 D1 D2 D3 D4 D5 D6 D7 D8 SP SP ST D0 D1
TXD2
TXEPT bit in U2C0 register IR bit in S2TIC register
1 0 1 0
ST
D0
Set to 0 when an interrupt request is acknowledged or by a program.
The above applies when: * PRYE bit in U2MR register = 0 (parity disabled) * STPS bit in U2MR register = 1 (two stop bits) * CRD bit in U2C0 register = 1 (CTS/RTS function disabled) * U2IRS bit in U2C1 register = 0 (interrupt request generation when the transmit buffer is empty) TC = 16(n + 1)/fj or 16(n + 1)/fEXT fj: Frequency of U2BRG count source (f1, f8, f32, fC) fEXT: Frequency of U2BRG count source (external clock) n: Setting value in U2BRG
Figure 22.7
Transmit Timing in UART Mode Apr 01, 2008
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22. Serial Interface (UART2)
Receive Timing Example When Transfer Data 8 Bits is Long (Parity Disabled, One Stop Bit)
U2BRG count source RE bit in U2C1 register RXD2
1 0
Stop bit
Start bit "L" is determined.
D0 D1 D7
Receive data taken in Transfer clock RI bit in U2C1 register
1 0 "H" "L"
Reception starts when a transfer clock is generated at the falling edge of the start bit.
Data transfer from UART2 receive register to U2RB register
RTS2
IR bit in S2RIC register
1 0
Set to 0 when an interrupt request is acknowledged or by a program.
The above applies when: * PRYE bit in U2MR register = 0 (parity disabled) * STPS bit in U2MR register = 0 (one stop bit) * CRD bit in U2C0 register = 0 (CTS2/RTS2 function enabled), CRS bit = 1 (RTS2 function selected)
Figure 22.8
Receive Timing in UART Mode
22.4.1
Bit Rate
In UART mode, the bit rate is the frequency divided by the U2BRG register divided by 16. Table 22.8 lists the Bit Rate Setting Example in UART Mode (Internal Clock Selected). Table 22.8
Bit Rate (bps) 1200 2400 4800 9600 14400 19200 28800 38400 57600 115200
Bit Rate Setting Example in UART Mode (Internal Clock Selected)
System Clock = 20 MHz U2BRG Actual Setting Setting Time Error Value (bps) (%) 129 (81h) 1201.92 0.16 64 (40h) 2403.85 0.16 32 (20h) 4734.85 -1.36 129 (81h) 9615.38 0.16 86 (56h) 14367.82 -0.22 64 (40h) 19230.77 0.16 42 (2Ah) 29069.77 0.94 32 (20h) 37878.79 -1.36 21 (15h) 56818.18 -1.36 10 (0Ah) 113636.36 -1.36 System Clock = 18.432 MHz (1) U2BRG Actual Setting Setting Time Error Value (bps) (%) 119 (77h) 1200.00 0.00 59 (3Bh) 2400.00 0.00 29 (1Dh) 4800.00 0.00 119 (77h) 9600.00 0.00 79 (4Fh) 14400.00 0.00 59 (3Bh) 19200.00 0.00 39 (27h) 28800.00 0.00 29 (1Dh) 38400.00 0.00 19 (13h) 57600.00 0.00 9 (09h) 115200.00 0.00 System Clock = 8 MHz U2BRG Actual Setting Setting Time Error Value (bps) (%) 51 (33h) 1201.92 0.16 25 (19h) 2403.85 0.16 12 (0Ch) 4807.69 0.16 51 (33h) 9615.38 0.16 34 (22h) 14285.71 -0.79 25 (19h) 19230.77 0.16 16 (10h) 29411.76 2.12 12 (0Ch) 38461.54 0.16 8 (08h) 55555.56 -3.55 - - -
U2BRG Count Source f8 f8 f8 f1 f1 f1 f1 f1 f1 f1
Note: 1. For the high-speed on-chip oscillator, the correction value in the FRA4 register should be written into the FRA1 register and the correction value in the FRA5 register should be written into the FRA3 register. This applies when the high-speed on-chip oscillator is selected as the system clock and bits FRA22 to FRA20 in the FRA2 register are set to 000b (divide-by-2 mode). For the precision of the high-speed on-chip oscillator, refer to 32. Electrical Characteristics.
REJ09B0458-0010 Rev.0.10 Page 329 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
22. Serial Interface (UART2)
22.4.2
Measure for Dealing with Communication Errors
If a communication error occurs while transmitting or receiving in UART mode, follow the procedures below: * Resetting the U2RB register (1) Set the RE bit in the U2C1 register to 0 (reception disabled). (2) Set the RE bit in the U2C1 register to 1 (reception enabled). * Resetting the U2TB register (1) Set bits SMD2 to SMD0 in the U2MR register to 000b (serial interface disabled). (2) Reset bits SMD2 to SMD0 in the U2MR register to 001b, 101b, and 110b. (3) Write 1 to the TE bit in the U2C1 register (transmission enabled), regardless of the TE bit value in the U2C1 register.
22.4.3
LSB First/MSB First Select Function
As shown in Figure 22.9, use the UFORM bit in the U2C0 register to select the transfer format. This function is enabled when transfer data is 8 bits long. Figure 22.9 shows the Transfer Format.
(1) UFORM Bit in U2C0 Register = 0 (LSB first)
CLK2 TXD2 RXD2 ST ST D0 D0 D1 D1 D2 D2 D3 D3 D4 D4 D5 D5 D6 D6 D7 D7 P P SP SP
(2) UFORM Bit in U2C0 Register = 1 (MSB first)
CLK2 TXD2 RXD2 ST ST D7 D7 D6 D6 D5 D5 D4 D4 D3 D3 D2 D2 D1 D1 D0 D0 P P SP SP
ST: Start bit P: Parity bit SP: Stop bit The above applies when: * CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock) * U2LCH bit in U2C1 register = 0 (not inverted) * STPS bit in U2MR register = 0 (one stop bit) * PRYE bit in U2MR register = 1 (parity enabled)
Figure 22.9
Transfer Format
REJ09B0458-0010 Rev.0.10 Page 330 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
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22. Serial Interface (UART2)
22.4.4
Serial Data Logic Switching Function
The data written to the U2TB register has its logic inverted before being transmitted. Similarly, the received data has its logic inverted when read from the U2RB register. Figure 22.10 shows the Serial Data Logic Switching.
(1) U2LCH bit in U2C1 Register = 0 (not inverted)
Transfer clock TXD2 (not inverted)
"H" "L" "H" "L"
ST
D0
D1
D2
D3
D4
D5
D6
D7
P
SP
(2) U2LCH Bit in U2C1 Register = 1 (inverted)
Transfer clock TXD2 (inverted)
"H" "L" "H" "L"
ST
D0
D1
D2
D3
D4
D5
D6
D7
P
SP
The above applies when: * CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge of the transfer clock) * UFORM bit in U2C0 register = 0 (LSB first) * STPS bit in U2MR register = 0 (one stop bit) * PRYE bit in U2MR register = 1 (parity enabled)
ST: Start bit P: Parity bit SP: Stop bit
Figure 22.10
Serial Data Logic Switching
22.4.5
TXD and RXD I/O Polarity Inverse Function
This function inverts the polarities of the TXD2 pin output and RXD2 pin input. The logic levels of all I/O data (including bits for start, stop, and parity) are inverted. Figure 22.11 shows the TXD and RXD I/O Inversion.
(1) IOPOL Bit in U2MR Register = 0 (not inverted)
Transfer clock TXD2 (not inverted) RXD2 (not inverted)
"H" "L" "H" "L" "H" "L"
ST ST
D0 D0
D1 D1
D2 D2
D3 D3
D4 D4
D5 D5
D6 D6
D7 D7
P P
SP SP
(2) IOPOL Bit in U2MR Register = 1 (inverted)
Transfer clock TXD2 (not inverted) RXD2 (not inverted)
"H" "L" "H" "L" "H" "L"
ST ST
D0 D0
D1 D1
D2 D2
D3 D3
D4 D4
D5 D5
D6 D6
D7 D7
P P
SP SP
The above applies when: * UFORM bit in U2C0 register = 0 (LSB first) * STPS bit in U2MR register = 0 (one stop bit) * PRYE bit in U2MR register = 1 (parity enabled)
ST: Start bit P: Parity bit SP: Stop bit
Figure 22.11
TXD and RXD I/O Inversion
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22. Serial Interface (UART2)
22.4.6
CTS/RTS Function
The CTS function is used to start transmit operation when "L" is applied to the CTS2/RTS2 pin. Transmit operation begins when the CTS2/RTS2 pin is held low. If the "L" signal is switched to "H" during transmit operation, the operation stops after the ongoing transmit/receive operation is completed. When the RTS function is used, the CTS2/RTS2 pin outputs "L" when the MCU is ready for a receive operation. The output level goes high at the first falling edge of the CLK2 pin. * The CRD bit in the U2C0 register = 1 (CTS/RTS function disabled) The CTS2/RTS2 pin operates as the programmable I/O function. * The CRD bit = 0, CRS bit = 0 (CTS function selected) The CTS2/RTS2 pin operates as the CTS function. * The CRD bit = 0, CRS bit = 1 (RTS function selected) The CTS2/RTS2 pin operates as the RTS function.
22.4.7
RXD2 Digital Filter Select Function
When the DF2EN bit in the URXDF register is set to 1 (RXD2 digital filer enabled), the RXD2 input signal is loaded internally via the digital filter circuit for noise reduction. The noise canceller consists of three cascaded latch circuits and a match detection circuit. The RXD2 input signal is sampled on the internal basic clock with a frequency 16 times the bit rate. It is recognized as a signal and the level is passed forward to the next circuit when three latch outputs match. When the outputs do not match, the previous value is retained. In other words, when the level is changed within three clocks, the change is recognized as not a signal but noise. Figure 22.12 shows a Block Diagram of RXD2 Digital Filter Circuit.
Sampling clock
C RXD2 input signal D Latch Q D
C Q Latch D
C Q Latch
Match detection circuit
URXDF register (DF2EN bit)
Internal RXD2 input signal
Internal basic clock period (1) Sampling clock
Note: 1. When the CKDIR bit in the U2MR register is 0 (internal clock), the internal basic clock is set to fj/(n+1) (fj = f1, f8, f32, fC; n = setting value in the U2BRG register). When the CKDIR bit in the U2MR register is 1 (external clock), the internal basic clock is set to fEXT/(n+1) (fEXT is input from the CLK2 pin. n = setting value in the U2BRG register).
Figure 22.12
Block Diagram of RXD2 Digital Filter Circuit
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22. Serial Interface (UART2)
22.5
Special Mode 1 (I2C Mode)
I2 C mode is provided for use as a simplified I2C interface compatible mode. Table 22.9 lists the I2C Mode Specifications. Tables 22.10 and 22.11 list the registers used in I2C mode and the settings. Table 22.12 lists the I2C Mode Functions, Figure 22.13 shows an I2C Mode Block Diagram, and Figure 22.14 shows the Transfer to U2RB Register and Interrupt Timing. As shown in Table 22.12, the MCU is placed in I2C mode by setting bits SMD2 to SMD0 to 010b and the IICM bit to 1. Because SDA2 transmit output has a delay circuit attached, SDA2 output does not change state until SCL2 goes low and remains stably low. Table 22.9 I2C Mode Specifications
Specification Transfer data length: 8 bits * Master mode The CKDIR bit in the U2MR register is set to 0 (internal clock): fj/(2(n+1)) fj = f1, f8, f32, fC n = setting value in the U2BRG register: 00h to FFh * Slave mode The CKDIR bit is set to 1 (external clock): Input from the SCL2 pin To start transmission, the following requirements must be met: (1) * The TE bit in the U2C1 register is set to 1 (transmission enabled). * The TI bit in the U2C1 register is set to 0 (data present in the U2TB register). To start reception, the following requirements must be met: (1) * The RE bit in the U2C1 register is set to 1 (reception enabled). * The TE bit in the U2C1 register is set to 1 (transmission enabled). * The TI bit in the U2C1 register is set to 0 (data present in the U2TB register). Start/stop condition detection, no acknowledgement detection, or acknowledgement detection Overrun error (2) This error occurs if the serial interface starts receiving the next unit of data before reading the U2RB register and receives the 8th bit of the next unit of data. * Arbitration lost Timing at which the ABT bit in the U2RB register is updated can be selected. * SDA2 digital delay No digital delay or a delay of 2 to 8 U2BRG count source clock cycles can be selected. * Clock phase setting With or without clock delay can be selected.
Item Transfer data format Transfer clock
Transmit start conditions
Receive start conditions
Interrupt request generation timing Error detection
Selectable functions
Notes: 1. when an external clock is selected, the requirements must be met while the external clock is held high. 2. If an overrun error occurs, the received data in the U2RB register will be undefined. The IR bit in the S2RIC register remains unchanged.
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22. Serial Interface (UART2)
SDA2 STSPSEL = 1 Delay circuit STSPSEL = 0 ACKC = 0 SDHI ACKD bit
DQ T
Start/stop condition generation block SDA (STSP) SCL (STSP)
IICM2 = 1
DTC request (source number 15) UART2 transmit/NACK interrupt request
IICM = 1 and IICM2 = 0
ACKC = 1
Transmit register UART2 ALS
Arbitration
Receive register UART2
IICM2 = 1
Start condition detection
S R Q
IICM = 1 and IICM2 = 0
UART2 receive/ACK interrupt request DTC request (source number 14)
Bus busy
NACK
Stop condition detection
DQ T DQ T
SCL2
Falling edge detection IICM = 0 I/O port
Q R
Port register (1) Internal clock SWC2 External clock
R S
ACK
9th bit Start/stop condition detection interrupt request UART2 9th bit falling edge SWC
STSPSEL = 0 UART2 STSPSEL IICM = 1 =1
CLK control
IICM: Bit in U2SMR register IICM2, SWC, ALS, SWC2, SDHI: Bits in U2SMR2 register STSPSEL, ACKD, ACKC: Bits in U2SMR4 register The above applies when: * Bits SMD2 to SMD0 in U2MR register = 010b * IICM bit in U2SMR register = 1 Note: If the IICM bit is set to 1, the pin can be read even when the port direction bit corresponding to the SCL2 pin is set to 1 (output mode).
Figure 22.13
I2C Mode Block Diagram
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22. Serial Interface (UART2)
Table 22.10
Register U2TB
(1)
Registers Used and Settings in I2C Mode (1)
Bit Function Master Set transmit data. Receive data can be read. ACK or NACK is set in this bit. Arbitration lost detect flag Overrun error flag Set a bit rate. Set to 010b. Set to 0. Set to 0. Select the count source for the U2BRG register. Disabled because CRD = 1. Transmit register empty flag Set to 1. Set to 1. Set to 0. Set to 1. Set to 1 to enable transmission. Transmit buffer empty flag Set to 1 to enable reception. Receive complete flag Disabled Set to 0. Set transmit data. Receive data can be read. ACK or NACK is set in this bit. Disabled Overrun error flag Disabled Set to 010b. Set to 1. Set to 0. Disabled Disabled because CRD = 1. Transmit register empty flag Set to 1. Set to 1. Set to 0. Set to 1. Set to 1 to enable transmission. Transmit buffer empty flag Set to 1 to enable reception. Receive complete flag Disabled Set to 0. Set to 1. Disabled Bus busy flag Set to 0. Refer to Table 22.12 I2C Mode Functions. Set to 0. Set to 1 to fix SCL2 output low at the falling edge of the 9th bit of clock. Set to 0. Set to 1 to initialize UART2 at start condition detection Set to 1 to forcibly pull SCL2 output low. Set to 1 to disable SDA2 output. Set to 0. Slave
b0 to b7 b0 to b7 b8 ABT OER b0 to b7 SMD2 to SMD0 CKDIR IOPOL CLK1, CLK0
U2RB (1)
U2BRG U2MR (1)
U2C0
CRS TXEPT CRD NCH CKPOL UFORM U2C1 TE TI RE RI U2IRS U2RRM, U2LCH, U2ERE U2SMR IICM Set to 1. ABC Select the timing at which an arbitration lost is detected. BBS Bus busy flag b3 to b7 Set to 0. U2SMR2 IICM2 Refer to Table 22.12 I2C Mode Functions. CSC Set to 1 to enable clock synchronization. SWC Set to 1 to fix SCL2 output low at the falling edge of the 9th bit of clock. ALS Set to 1 to stop SDA2 output when an arbitration lost is detected. STAC Set to 0. SWC2 SDHI b7 Set to 1 to forcibly pull SCL2 low. Set to 1 to disable SDA2 output. Set to 0.
Note: 1. Set the bits not listed in this table to 0 when writing to the above registers in I2C mode.
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22. Serial Interface (UART2)
Table 22.11
Register
Registers Used and Settings in I2C Mode (2)
Bit Set to 0. Refer to Table 22.12 I2C Mode Functions. Set the amount of SDA2 digital delay. Set to 1 to generate a start condition. Set to 1 to generate a restart condition. Set to 1 to generate a stop condition. Set to 1 to output each condition. Select ACK or NACK. Set to 1 to output ACK data. Set to 1 to stop SCL2 output when a stop condition is detected. Set to 0. Set to 0. Set to 0. Function Master Set to 0. Refer to Table 22.12 I2C Mode Functions. Set the amount of SDA2 digital delay. Set to 0. Set to 0. Set to 0. Set to 0. Select ACK or NACK. Set to 1 to output ACK data. Set to 0. Set to 1 to hold SCL2 low at the falling edge of the 9th bit of clock. Set to 0. Set to 0. Slave
U2SMR3 b0, b2, b4, and NODC CKPH DL2 to DL0 U2SMR4 STAREQ RSTAREQ STPREQ STSPSEL ACKD ACKC SCLHI SWC9 URXDF DF2EN U2SMR5 MP
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22. Serial Interface (UART2)
Table 22.12
Function
I2C Mode Functions
Clock Synchronous Serial I/O Mode (SMD2 to SMD0 = 001b, IICM = 0)
-
I2C Mode (SMD2 to SMD0 = 010b, IICM = 1) IICM2 = 0 (NACK/ACK interrupt) CKPH = 0 (No Clock Delay) CKPH = 1 (With Clock Delay) IICM2 = 1 (UART transmit/receive interrupt) CKPH = 0 (No Clock Delay) CKPH = 1 (With Clock Delay)
Source of UART2 bus collision interrupt (1, 5) Source of UART2 transmit/NACK2 (1, 6)
Start condition detection or stop condition detection (Refer to Table 22.13 STSPSEL Bit Functions) No acknowledgment detection (NACK) Rising edge of SCL2 9th bit UART2 transmission Rising edge of SCL2 9th bit UART2 transmission Falling edge of SCL2 next to 9th bit
UART2 transmission Transmission started or completed (selectable by U2IRS bit)
Source of UART2 receive/ACK2 (1, 6)
UART2 reception Acknowledgment detection (ACK) When 8th bit received Rising edge of SCL2 9th bit CKPOL = 0 (rising edge) CKPOL = 1 (falling edge)
UART2 reception Falling edge of SCL2 9th bit
Timing for transferring data CKPOL = 0 (rising edge) Rising edge of SCL2 9th bit from UART reception shift CKPOL = 1 (falling edge) register to U2RB register UART2 transmission output delay TXD2/SDA2 functions RXD2/SCL2 functions CLK2 functions Read of RXD2 and SCL2 pin levels Initial value of TXD2 and SDA2 outputs Initial and end values of SCL2 DTC source number 14 (6) No delay TXD2 output RXD2 input CLK2 input or output port selected Possible when the corresponding port direction bit = 0 CKPOL = 0 ("H") CKPOL = 1 ("L")
-
Falling edge of SCL2 9th bit
Falling and rising edges of SCL2 9th bit
With delay SDA2 I/O SCL2 I/O
- (Cannot be used in I2C mode.)
Possible regardless of the content of the corresponding port direction bit.
The value set in the port register before setting I2C mode. (2) "H" "L" "H" "L"
Acknowledgment detection (ACK) UART2 reception When 8th bit received CKPOL = 0 (rising edge) CKPOL = 1 (falling edge) UART2 transmission Transmission started or completed (selectable by U2IRS bit) 1st to 8th bits of the received data are stored in bits b0 to b7 in the U2RB register. UART2 transmission Rising edge of SCL2 9th bit UART2 transmission Falling edge of SCL2 next to 9th bit
UART2 reception Falling edge of SCL2 9th bit
DTC source number 15 (6)
UART2 transmission Rising edge of SCL2 9th bit
UART2 transmission Falling edge of SCL2 next to 9th bit
Storage of receive data
1st to 8th bits of the received data are stored in bits b7 to b0 in the U2RB register.
1st to 7th bits of the received data are stored in bits b6 to b0 in the U2RB register. 8th bit is stored in bit b8 in the U2RB register. 1st to 8th bits are stored in bits b7 to b0 in the U2RB register. (3) Bits b6 to b0 in the U2RB register are read as bits b7 to b1. Bit b8 in the U2RB register is read as bit b0. (4)
Read of receive data
The U2RB register status is read.
Notes: 1.
2. 3. 4. 5. 6.
If the source of any interrupt is changed, the IR bit in the interrupt control register for the changed interrupt may inadvertently be set to 1 (interrupt requested). (Refer to 11.8 Notes on Interrupts.) If one of the bits listed below is changed, the interrupt source, the interrupt timing, and others change. Therefore, always be sure to set the IR bit to 0 (interrupt not requested) after changing these bits. Bits SMD2 to SMD0 in the U2MR register, the IICM bit in the U2SMR register, the IICM2 bit in the U2SMR2 register, and the CKPH bit in the U2SMR3 register. Set the initial value of SDA2 output while bits SMD2 to SMD0 in the U2MR register are 000b (serial interface disabled). Second data transfer to the U2RB register (rising edge of SCL2 9th bit) First data transfer to the U2RB register (falling edge of SCL2 9th bit) Refer to Figure 22.16 STSPSEL Bit Functions. Refer to Figure 22.14 Transfer to U2RB Register and Interrupt Timing.
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22. Serial Interface (UART2)
(1) IICM2 = 0 (ACK and NACK interrupts), CKPH = 0 (no clock delay)
1st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit 9th bit
SCL2 SDA2 D7 D6 D5 D4 D3 D2 D1 D0 D8 (ACK, NACK)
ACK interrupt (DTC source number 14 request), NACK interrupt Transfer to U2RB register
b15 b9 b8 D8 b7 D7 D6 D5 D4 D3 D2 D1 b0 D0
...
U2RB register contents
(2) IICM2 = 0, CKPH = 1 (with clock delay)
1st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit 9th bit
SCL2 SDA2 D7 D6 D5 D4 D3 D2 D1 D0 D8 (ACK, NACK)
ACK interrupt (DTC source number 14 request), NACK interrupt Transfer to U2RB register
b15 b9 b8 D8 b7 D7 D6 D5 D4 D3 D2 D1 b0 D0
...
U2RB register contents
(3) IICM2 = 1 (UART transmit/receive interrupt), CKPH = 0
1st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit 9th bit
SCL2 SDA2 D7 D6 D5 D4 D3 D2 D1 D0 D8 (ACK, NACK)
Transmit interrupt
Receive interrupt (DTC source number 14 request)
Transfer to U2RB register
b15 b9 b8 D0 b7 D7 D6 D5 D4 D3 D2 b0 D1
...
U2RB register contents
(4) IICM2 = 1, CKPH = 1
1st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit 9th bit
SCL2 SDA2 D7 D6 D5 D4 D3 D2 D1 D0 D8 (ACK, NACK)
Transmit interrupt
Receive interrupt (DTC source number 14 request)
Transfer to U2RB register
b15 b9 b8 D0 b7 D7 D6 D5 D4 D3 D2 b0 D1
Transfer to U2RB register
b15 b9 b8 D8 b7 D7 D6 D5 D4 D3 D2 D1 b0 D0
...
...
U2RB register contents
U2RB register contents
The above applies when: * CKDIR bit in U2MR register = 0 (master selected)
Figure 22.14
Transfer to U2RB Register and Interrupt Timing Apr 01, 2008
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22. Serial Interface (UART2)
22.5.1
Detection of Start and Stop Conditions
Whether a start or a stop condition has been detected is determined. A start condition detect interrupt request is generated when the SDA2 pin changes state from high to low while the SCL2 pin is in the high state. A stop condition detect interrupt request is generated when the SDA2 pin changes state from low to high while the SCL2 pin is in the high state. Because the start and stop condition detect interrupts share an interrupt control register and vector, check the BBS bit in the U2SMR register to determine which interrupt source is requesting the interrupt. Figure 22.15 shows the Detection of Start and Stop Conditions.
5 cycles of f1 < Setting up duration 5 cycles of f1 < Holding duration Setting up duration
SCL2 SDA2
Holding duration
(Start condition)
SDA2
(Stop condition)
Figure 22.15
Detection of Start and Stop Conditions
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22. Serial Interface (UART2)
22.5.2
Output of Start and Stop Conditions
A start condition is generated by setting the STAREQ bit in the U2SMR4 register to 1 (start). A restart condition is generated by setting the RSTAREQ bit in the U2SMR4 register to 1 (start). A stop condition is generated by setting the STPREQ bit in the U2SMR4 register to 1 (start). The output procedure is as follows: (1) Set the STAREQ bit, RSTAREQ bit or STPREQ bit to 1 (start). (2) Set the STSPSEL bit in the U2SMR4 register to 1 (output). Table 22.13 lists the STSPSEL Bit Functions. Figure 22.16 shows the STSPSEL Bit Functions. Table 22.13 STSPSEL Bit Functions STSPSEL = 0 Output of transfer clock and data Output of start/stop conditions is accomplished by a program using ports (not automatically generated in hardware) Detection of start/stop conditions STSPSEL = 1 Output of start/stop conditions according to bits STAREQ, RSTAREQ, and STPREQ
Function Output of pins SCL2 and SDA2
Start/stop condition interrupt request generation timing
Completion of start/stop condition generation
(1) Slave Mode CKDIR = 1 (external clock)
STSPSEL bit SCL2 SDA2 0
1st 2nd 3rd 4th 5th 6th 7th 8th 9th bit
Start condition detection interrupt
Stop condition detection interrupt
(2) Master Mode CKDIR = 0 (internal clock), CKPH = 1 (with clock delay)
STSPSEL bit
Set to 1 by Set to 0 by a program. a program.
SCL2 SDA2
Set to 1 by a program.
Set to 0 by a program.
1st 2nd 3rd 4th 5th 6th 7th 8th 9th bit
Set STAREQ = 1 (start)
Start condition detection interrupt
Set STPREQ = 1 (start) Stop condition detection interrupt
Figure 22.16
STSPSEL Bit Functions
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22. Serial Interface (UART2)
22.5.3
Arbitration
Unmatching of the transmit data and SDA2 pin input data is checked in synchronization with the rising edge of SCL2. Use the ABC bit in the U2SMR register to select the timing at which the ABT bit in the U2RB register is updated. If the ABC bit is set to 0 (update per bit), the ABT bit is set to 1 at the same time unmatching is detected during check, and is set to 0 when not detected. If the ABC bit is set to 1, if unmatching is ever detected, the ABT bit is set to 1 (unmatching detected) at the falling edge of the clock pulse of the 9th bit. If the ABT bit needs to be updated per byte, set the ABT bit to 0 (not detected) after detecting acknowledge for the first byte, before transferring the next byte. Setting the ALS bit in the U2SMR2 register to 1 (SDA output stop enabled) causes an arbitration lost to occur, in which case the SDA2 pin is placed in the high-impedance state at the same time the ABT bit is set to 1 (unmatching detected).
22.5.4
Transfer Clock
The transfer clock is used to transmit and receive data as is shown in Figure 22.14 Transfer to U2RB Register and Interrupt Timing. The CSC bit in the U2SMR2 register is used to synchronize an internally generated clock (internal SCL2) and an external clock supplied to the SCL2 pin. When the CSC bit is set to 1 (clock synchronization enabled), if a falling edge on the SCL2 pin is detected while the internal SCL2 is high, the internal SCL2 goes low. The value in the U2BRG register is reloaded and counting of the low-level intervals starts. If the internal SCL2 changes state from low to high while the SCL2 pin is low, counting stops. If the SCL2 pin goes high, counting restarts. In this way, the UART2 transfer clock is equivalent to AND of the internal SCL2 and the clock signal applied to the SCL2 pin. The transfer clock works from a half cycle before the falling edge of the internal SCL2 1st bit to the rising edge of the 9th bit. To use this function, select an internal clock for the transfer clock. The SWC bit in the U2SMR2 register determines whether the SCL2 pin is fixed low or freed from low-level output at the falling edge of the 9th clock pulse. If the SCLHI bit in the U2SMR4 register is set to 1 (enabled), SCL2 output is turned off (placed in the highimpedance state) when a stop condition is detected. Setting the SWC2 bit in the U2SMR2 register to 1 ("L" output) makes it possible to forcibly output a low-level signal from the SCL2 pin even while sending or receiving data. Setting the SWC2 bit to 0 (transfer clock) allows the transfer clock to be output from or supplied to the SCL2 pin, instead of outputting a low-level signal. If the SWC9 bit in the U2SMR4 register is set to 1 (SCL "L" hold enabled) when the CKPH bit in the U2SMR3 register is 1, the SCL2 pin is fixed low at the falling edge of the clock pulse next to the 9th. Setting the SWC9 bit to 0 (SCL "L" hold disabled) frees the SCL2 pin from low-level output.
22.5.5
SDA Output
The data written to bits b7 to b0 (D7 to D0) in the U2TB register is output in descending order from D7. The 9th bit (D8) is ACK or NACK. Set the initial value of SDA2 transmit output when IICM is set to 1 (I2C mode) and bits SMD2 to SMD0 in the U2MR register are set to 000b (serial interface disabled). Bits DL2 to DL0 in the U2SMR3 register allow addition of no delays or a delay of 2 to 8 U2BRG count source clock cycles to the SDA2 output. Setting the SDHI bit in the U2SMR2 register to 1 (SDA output disabled) forcibly places the SDA2 pin in the high-impedance state. Do not write to the SDHI bit at the rising edge of the UART2 transfer clock. This is because the ABT bit may inadvertently be set to 1 (detected).
REJ09B0458-0010 Rev.0.10 Page 341 of 572
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22. Serial Interface (UART2)
22.5.6
SDA Input
When the IICM2 bit is set to 0, the 1st to 8th bits (D7 to D0) of received data are stored in bits b7 to b0 in the U2RB register. The 9th bit (D8) is ACK or NACK. When the IICM2 bit is set to 1, the 1st to 7th bits (D7 to D1) of received data are stored in bits b6 to b0 in the U2RB register and the 8th bit (D0) is stored in bit b8 in the U2RB register. Even when the IICM2 bit is set to 1, if the CKPH bit is 1, the same data as when the IICM2 bit is 0 can be read by reading the U2RB register after the rising edge of 9th bit of the clock.
22.5.7
ACK and NACK
If the STSPSEL bit in the U2SMR4 register is set to 0 (start and stop conditions not output) and the ACKC bit in the U2SMR4 register is set to 1 (ACK data output), the value of the ACKD bit in the U2SMR4 register is output from the SDA2 pin. If the IICM2 bit is set to 0, a NACK interrupt request is generated if the SDA2 pin remains high at the rising edge of the 9th bit of transmit clock pulse. An ACK interrupt request is generated if the SDA2 pin is low at the rising edge of the 9th bit of the transmit clock. If ACK2 (UART2 reception) is selected to generate a DTC request source, a DTC transfer can be activated by detection of an acknowledge.
22.5.8
Initialization of Transmission/Reception
If a start condition is detected while the STAC bit is set to 1 (UART2 initialization enabled), the serial interface operates as described below. * The transmit shift register is initialized, and the contents of the U2TB register are transferred to the transmit shift register. In this way, the serial interface starts sending data when the next clock pulse is applied. However, the UART2 output value does not change state and remains the same as when a start condition was detected until the first bit of data is output in synchronization with the input clock. * The receive shift register is initialized, and the serial interface starts receiving data when the next clock pulse is applied. * The SWC bit is set to 1 (SCL wait output enabled). Consequently, the SCL2 pin is pulled low at the falling edge of the 9th clock pulse. Note that when UART2 transmission/reception is started using this function, the TI bit does not change state. Select the external clock as the transfer clock to start UART2 transmission/reception with this setting.
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Preliminary specification Specifications in this manual are tentative and subject to change.
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22. Serial Interface (UART2)
22.6
Multiprocessor Communication Function
When the multiprocessor communication function is used, data transmission/reception can be performed between a number of processors sharing communication lines by asynchronous serial communication, in which a multiprocessor bit is added to the data. For multiprocessor communication, each receiving station is addressed by a unique ID code. The serial communication cycle consists of two component cycles; an ID transmission cycle for specifying the receiving station, and a data transmission cycle for the specified receiving station. The multiprocessor bit is used to differentiate between the ID transmission cycle and the data transmission cycle. When the multiprocessor bit is set to 1, the cycle is an ID transmission cycle; when the multiprocessor bit is set to 0, the cycle is a data transmission cycle. Figure 22.17 shows an Inter-Processor Communication Example Using Multiprocessor Format (Data AAh Transmission to Receiving Station A). The transmitting station first sends the ID code of the receiving station to perform communication as communication data with a 1 multiprocessor bit added. It then sends transmit data as communication data with a 0 multiprocessor bit added. When communication data in which the multiprocessor bit is 1 is received, the receiving station compares that data with its own ID. If they match, the data to be sent next is received. If they do not match, the receive station continues to skip communication data until data in which the multiprocessor bit is 1 is again received. UART2 uses the MPIE bit in the U2SMR5 register to implement this function. When the MPIE bit is set to 1, data transfer from the UART2 receive register to the U2RB register, receive error detection, and the settings of the status flags, the RI bit in the U2C1 register, bits FER and OER in the U2RB register, are disabled until data in which the multiprocessor bit is 1 is received. On receiving a receive character in which the multiprocessor bit is 1, the MPRB bit in the U2RB register is set to 1 and the MPIE in the U2SMR5 register bit is set to 0, thus normal reception is resumed. When the multiprocessor format is specified, the parity bit specification is invalid. All other bit settings are the same as those in normal asynchronous mode (UART mode). The clock used for multiprocessor communication is the same as that in normal asynchronous mode (UART mode). Figure 22.18 shows a Block Diagram of Multiprocessor Communication Function. Table 22.14 lists the Registers and Settings in Multiprocessor Communication Function.
Transmitting station Communication line
Receiving station A (ID = 01)
Receiving station B (ID = 02)
Receiving station C (ID = 03)
Receiving station D (ID = 04)
Serial data
01h (MPRB = 1)
ID transmission cycle = receiving station specification
AAh (MPRB = 0)
Data transmission cycle = data transmission to receiving station specified by ID
MPRB: Multiprocessor bit
Figure 22.17
Inter-Processor Communication Example Using Multiprocessor Format (Data AAh Transmission to Receiving Station A)
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22. Serial Interface (UART2)
Reception
(5) 1SP DF2EN = 0 Clock synchronous type UART (7 bits) UART (8 bits)
PRYE = 0 Clock PAR synchronous disabled type PAR enabled PRYE = 1 UART
UART (7 bits)
UART2 receive register
SP
DF2EN = 1 Digital filter 2SP
SP
PAR
UART (9 bits) (2) (1) Clock synchronous type UART (8 bits) UART (9 bits)
RXD2
0
0
0
0
0
0
0
MPRB
D7
D6
D5
D4
D3
D2
D1
D0 U2RB register
MSB/LSB conversion circuit Data bus high-order bits Data bus low-order bits MSB/LSB conversion circuit MPTB
(4) UART (9 bits) UART (3)
D7
UART (8 bits) UART (9 bits) Clock synchronous type
D6
D5
D4
D3
D2
D1
D0 register
U2TB
Transmission
2SP
PAR enabled PRYE = 1
TXD2 UART2 transmit register
SP
SP
1SP
PAR
Clock PAR synchronous disabled PRYE = 0 type 0 UART (7 bits) UART UART (8 bits) (7 bits) Clock synchronous type
(5)
[Multiprocessor mode reception when MP = 1 (multiprocessor communication enabled)] (1) Clock asynchronous (7 bits): Received D7 is transferred to b8 in the U2RB register. (2) Clock asynchronous (8 bits): Received D8 is transferred to b8 in the U2RB register. [Multiprocessor mode transmission when MP = 1 (multiprocessor communication enabled)] (3) Clock asynchronous (7 bits): b8 in the U2TB register is transferred externally as transfer data D7. (4) Clock asynchronous (8 bits): b8 in the U2TB register is transferred externally as transfer data D8. [Multiprocessor mode transmission/reception] (5) PAR is disabled.
SP: Stop bit PAR: Parity bit PRYE: Bit in U2MR register DF2EN: Bit in URXDF register MP: Bit in U2SMR5 register
Figure 22.18
Block Diagram of Multiprocessor Communication Function
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22. Serial Interface (UART2)
Table 22.14 Register U2TB
(1)
Registers and Settings in Multiprocessor Communication Function Bit b0 to b7 MPTB b0 to b7 MPRB OER, FER, SUM b0 to b7 SMD2 to SMD0 CKDIR STPS PRY, PRYE IOPOL CLK0, CLK1 CRS TXEPT CRD NCH CKPOL UFORM TE TI RE RI U2IRS U2LCH U2ERE b0 to b7 b0 to b7 b0 to b7 b0 to b7 MP MPIE DF2EN Function Set transmit data. Set to 0 or 1. Receive data can be read. Multiprocessor bit Error flag Set the transfer rate. Set to 100b when transfer data is 7 bits long. Set to 101b when transfer data is 8 bits long. Select the internal clock or external clock. Select the stop bit. Parity detection function disabled Set to 0. Select the U2BRG count source. CTS or RTS function disabled Transmit register empty flag Set to 0. Select TXD2 pin output mode. Set to 0. Set to 0. Set to 1 to enable transmission. Transmit buffer empty flag Set to 1 to enable reception. Receive complete flag Select the UART2 transmit interrupt source. Set to 0. Set to 0. Set to 0. Set to 0. Set to 0. Set to 0. Set to 1. Set to 1. Select the digital filter enabled or disabled.
U2RB (2)
U2BRG U2MR
U2C0
U2C1
U2SMR U2SMR2 U2SMR3 U2SMR4 U2SMR5 URXDF
Notes: 1. Set the MPTB bit to 1 when the ID data frame is transmitted. Set this bit to 0 when the data frame is transmitted. 2. If the MPRB bit is set to 1, received D7 to D0 are ID fields. If the MPRB bit is set to 0, received D7 to D0 are data fields.
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22. Serial Interface (UART2)
22.6.1
Multiprocessor Transmission
Figure 22.19 shows a Sample Flowchart of Multiprocessor Data Transmission. Set the MPBT bit in the U2TB register to 1 for ID transmission cycles. Set the MPBT bit in the U2TB register to 0 for data transmission cycles. Other operations are the same as in universal asynchronous receiver/transmitter mode (UART mode).
Start
(1)
Read the TI bit in the U2C1 register (1) Read the U2C1 register to confirm that the TI bit is set to 1. Then set the MPBT bit in the U2TB register to 0 or 1 and write transmit data to the U2TB register. Writing data to the U2TB register sets the TI bit to 0 automatically. (2) When transmission completes, the TXEPT bit is set to 1 automatically. (3) To continue data transmission, read that the TI bit is 1 and write data tot the U2TB register. Writing data to the U2TB register sets the TI bit to 0 automatically.
TI = 1? Yes Set the MPBT bit in the U2TB register
No
Write transmit data to the U2TB register
Read the TXEPT bit in the U2C0 register No
(2)
TXEPT = 1? Yes
(3)
Continue data transmission? No Set the TE bit in the U2C1 register to 0
Yes
End
Figure 22.19
Sample Flowchart of Multiprocessor Data Transmission
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22. Serial Interface (UART2)
22.6.2
Multiprocessor Reception
Figure 22.20 shows a Sample Flowchart of Multiprocessor Data Reception. When the MPIE bit in the U2SMR5 register is set to 1, communication data is ignored until data in which the multiprocessor bit is 1 is received. Communication data with a 1 multiprocessor bit added is transferred to the U2RB register as receive data. At this time, a reception complete interrupt request is generated. Other operations are the same as in universal asynchronous receiver/transmitter mode (UART mode). Figure 22.21 shows a Receive Operation Example during Multiprocessor Communication (with 8-Bit Data/Multiprocessor Bit/One-Stop Bit).
Start
(1)
Set the MPIE bit in the U2SMR5 register to 1
(1) Set the MPIE bit in the U2SMR5 register to 1. (2) When the MPRB bit is detected to be 1, the MPIE bit is set to 0 and a reception complete interrupt request can be generated. Read the U2C1 register to confirm that the RI bit is set to 1. If the RI bit is 1, read data in the receive shift register and compare the data with its own station ID. Reading data in the U2RB register sets the RI bit to 0 automatically. (3) When the data matches the own station ID, the next data reception starts. When the data does not match the ID, set the MPIE bit to 1 and the MCU enters the idle state. (4) Read the U2C1 register to confirm that the RI bit is set to 1. Then read data in the receive shift register. (5) To discontinue reception, set the RE bit in the U2C0 register to 0 to complete reception. To continue reception, restart the procedure from step (1). No
Read the RI bit in the U2C1 register
(2)
RI = 1? Yes Read data in the receive shift register Yes
No
(3)
Own station ID?
No
Read the RI bit in the U2C1 register
(4)
RI = 1? Yes Read receive data in the U2RB register
(5)
Continue data reception? No Set the RE bit in the U2C1 register to 0
Yes
End
Figure 22.20
Sample Flowchart of Multiprocessor Data Reception
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22. Serial Interface (UART2)
Start bit
Receive data (ID1)
MPRB
Stop bit
Receive data (DATA1)
MPRB
Marked state (Idle state)
Serial data
1
0
D0
D1
1 frame
D7
1
1
0
D0
D1
1 frame
D7
0
1
1
MP bit in U2SMR5 register MPIE bit in U2SMR5 register RI bit in U2C1 register
1 1 0 1 0
U2RB register
ID1 No reception complete interrupt request is generated. The U2RB register retains state.
MCU operation User processing
Detect the MPRB bit and A reception complete interrupt request is set the MPIE bit to 0. generated.
Set the RI bit to 0. Read data in the U2RB register. If data does not match own station ID, set the MPIE bit to 1 again.
(a) When Data Does Not Match Own Station ID
Start bit
Receive data (ID2)
MPRB
Stop bit
Receive data (DATA2)
MPRB
Marked state (Idle state)
Serial data
1
0
D0
D1
1 frame
D7
1
1
0
D0
D1
1 frame
D7
0
1
1
MP bit in U2SMR5 register MPIE bit in U2SMR5 register RI bit in U2C1 register
1 1 0 1 0
U2RB register
ID1 Detect the MPRB bit and A reception complete set the MPIE bit to 0. interrupt request is generated.
ID2
DATA2
MCU operation User processing
Set the RI bit to 0.
A reception Set the RI bit to 0. complete interrupt request Read data in the If data matches own is generated. Read data in the Set the MPIE bit U2RB register. station ID, continue to 1 again. U2RB register. reception without any setting changes.
(b) When Data Matches Own Station ID
MPRB: Bit in U2RB register MPIE: Bit in U2SMR5 register
Figure 22.21
Receive Operation Example during Multiprocessor Communication (with 8-Bit Data/Multiprocessor Bit/One-Stop Bit)
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22. Serial Interface (UART2)
22.6.3
RXD2 Digital Filter Select Function
When the DF2EN bit in the URXDF register is set to 1 (RXD2 digital filer enabled), the RXD2 input signal is loaded internally via the digital filter circuit for noise reduction. The noise canceller consists of three cascaded latch circuits and a match detection circuit. The RXD2 input signal is sampled on the internal basic clock with a frequency 16 times the bit rate. It is recognized as a signal and the level is passed forward to the next circuit when three latch outputs match. When the outputs do not match, the previous value is retained. In other words, when the level is changed within three clocks, the change is recognized as not a signal but noise. Figure 22.22 shows a Block Diagram of RXD2 Digital Filter Circuit.
Sampling clock
C RXD2 input signal D Latch Q D
C Q Latch D
C Q Latch
Match detection circuit
URXDF register (DF2EN bit)
Internal RXD2 input signal
Internal basic clock period (1) Sampling clock
Note: 1. When the CKDIR bit in the U2MR register is 0 (internal clock), the internal basic clock is set to fj/(n+1) (fj = f1, f8, f32, fC; n = setting value in the U2BRG register). When the CKDIR bit in the U2MR register is 1 (external clock), the internal basic clock is set to fEXT/(n+1) (fEXT is input from the CLK2 pin. n = setting value in the U2BRG register).
Figure 22.22
Block Diagram of RXD2 Digital Filter Circuit
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22. Serial Interface (UART2)
22.7 22.7.1
Notes on Serial Interface (UART2) Clock Synchronous Serial I/O Mode Transmission/Reception
22.7.1.1
When the RTS function is used with an external clock, the RTS2 pin outputs "L," which informs the transmitting side that the MCU is ready for a receive operation. The RTS2 pin outputs "H" when a receive operation starts. Therefore, the transmit timing and receive timing can be synchronized by connecting the RTS2 pin to the CTS2 pin of the transmitting side. The RTS function is disabled when an internal clock is selected.
22.7.1.2
Transmission
If an external clock is selected, the following conditions must be met while the external clock is held high when the CKPOL bit in the U2C0 register is set to 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock), or while the external clock is held low when the CKPOL bit is set to 1 (transmit data output at the rising edge and receive data input at the falling edge of the transfer clock). * The TE bit in the U2C1 register = 1 (transmission enabled) * The TI bit in the U2C1 register = 0 (data present in the U2TB register) * If the CTS function is selected, input on the CTS2 pin = "L"
22.7.1.3
Reception
In clock synchronous serial I/O mode, the shift clock is generated by activating the transmitter. Set the UART2associated registers for transmit operation even if the MCU is used for receive operation only. Dummy data is output from the TXD2 pin while receiving. When an internal clock is selected, the shift clock is generated by setting the TE bit in the U2C1 register to 1 (transmission enabled) and placing dummy data in the U2TB register. When an external clock is selected, set the TE bit to 1 (transmission enabled), place dummy data in the U2TB register, and input an external clock to the CLK2 pin to generate the shift clock. If data is received consecutively, an overrun error occurs when the RE bit in the U2C1 register is set to 1 (data present in the U2RB register) and the next receive data is received in the UART2 receive register. Then, the OER bit in the U2RB register is set to 1 (overrun error). At this time, the U2RB register value is undefined. If an overrun error occurs, the IR bit in the S2RIC register remains unchanged. To receive data consecutively, set dummy data in the low-order byte in the U2TB register per each receive operation. If an external clock is selected, the following conditions must be met while the external clock is held high when the CKPOL bit is set to 0, or while the external clock is held low when the CKPOL bit is set to 1. * The RE bit in the U2C1 register = 1 (reception enabled) * The TE bit in the U2C1 register = 1 (transmission enabled) * The TI bit in the U2C1 register = 0 (data present in the U2TB register)
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22. Serial Interface (UART2)
22.7.2
Clock Asynchronous Serial I/O (UART) Mode Transmission/Reception
22.7.2.1
When the RTS function is used with an external clock, the RTS2 pin outputs "L," which informs the transmitting side that the MCU is ready for a receive operation. The RTS2 pin outputs "H" when a receive operation starts. Therefore, the transmit timing and receive timing can be synchronized by connecting the RTS2 pin to the CTS2 pin of the transmitting side. The RTS function is disabled when an internal clock is selected.
22.7.2.2
Transmission
If an external clock is selected, the following conditions must be met while the external clock is held high when the CKPOL bit in the U2C0 register is set to 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock), or while the external clock is held low when the CKPOL bit is set to 1 (transmit data output at the rising edge and receive data input at the falling edge of the transfer clock). * The TE bit in the U2C1 register = 1 (transmission enabled) * The TI bit in the U2C1 register = 0 (data present in the U2TB register) * If the CTS function is selected, input on the CTS2 pin = "L"
22.7.3
Special Mode 1 (I2C Mode)
When generating start, stop, and restart conditions, set the STSPSEL bit in the U2SMR4 register to 0 and wait for more than half cycle of the transfer clock before changing each condition generation bit (STAREQ, RSTAREQ, and STPREQ) from 0 to 1.
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23. Clock Synchronous Serial Interface
23. Clock Synchronous Serial Interface
The clock synchronous serial interface is configured as follows. Clock synchronous serial interface Synchronous serial communication unit (SSU) Clock synchronous communication mode 4-wire bus communication mode I2C bus Interface I2C bus interface mode Clock synchronous serial mode The clock synchronous serial interface uses the registers at addresses 0193h to 019Dh. Registers, bits, symbols, and functions vary even for the same addresses depending on the mode. Refer to the registers of each function for details. Also, the differences between clock synchronous communication mode and clock synchronous serial mode are the options of the transfer clock, clock output format, and data output format.
23.1
Mode Selection
The clock synchronous serial interface has four modes. Table 23.1 lists the Mode Selections. Refer to 24. Synchronous Serial Communication Unit (SSU), 25. I2C bus Interface and the sections that follow for details of each mode. Table 23.1 Mode Selections
Mode Clock synchronous communication mode 4-wire bus communication mode I2C bus interface mode Clock synchronous serial mode
Bit 0 in 019Dh IICSEL Bit in Bit 7 in 0198h (SSUMS Bit in SSMR2 SSUIICSR (ICE Bit in ICCR1 Function Register, FS Bit in Register Register) SAR Register) 0 0 0 Synchronous serial communication unit 0 0 1 1 1 0 I2C bus interface 1 1 1
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24. Synchronous Serial Communication Unit (SSU)
24. Synchronous Serial Communication Unit (SSU)
Synchronous serial communication unit (SSU) supports clock synchronous serial data communication.
24.1
Overview
Table 24.1 lists a Synchronous Serial Communication Unit Specifications, Figure 24.1 shows a Block Diagram of Synchronous Serial Communication Unit and Table 24.2 lists the Pin Configuration of Synchronous Serial Communication Unit. Table 24.1 Synchronous Serial Communication Unit Specifications
Specification * Transfer data length: 8 to 16 bits Continuous transmission and reception of serial data are supported since both transmitter and receiver have buffer structures. Operating modes * Clock synchronous communication mode * 4-wire bus communication mode (including bidirectional communication) Master/slave device Selectable I/O pins SSCK (I/O): Clock I/O pin SSI (I/O): Data I/O pin SSO (I/O): Data I/O pin SCS (I/O): Chip-select I/O pin Transfer clocks * When the MSS bit in the SSCRH register is set to 0 (operates as slave device), external clock is selected (input from SSCK pin). * When the MSS bit in the SSCRH register is set to 1 (operates as master device), internal clock (selectable among f1/256, f1/128, f1/64, f1/32, f1/16, f1/8 and f1/4, output from SSCK pin) is selected. * Clock polarity and phase of SSCK can be selected. Receive error detection * Overrun error Overrun error occurs during reception and completes in error. While the RDRF bit in the SSSR register is set to 1 (data in the SSRDR register) and when next serial data receive is completed, the ORER bit is set to 1. Multimaster error * Conflict error When the SSUMS bit in the SSMR2 register is set to 1 (4-wire bus detection communication mode) and the MSS bit in the SSCRH register is set to 1 (operates as master device) and when starting a serial communication, the CE bit in the SSSR register is set to 1 if "L" applies to the SCS pin input. When the SSUMS bit in the SSMR2 register is set to 1 (4-wire bus communication mode), the MSS bit in the SSCRH register is set to 0 (operates as slave device) and the SCS pin input changes state from "L" to "H", the CE bit in the SSSR register is set to 1. Interrupt requests 5 interrupt requests (transmit-end, transmit-data-empty, receive-data-full, overrun error, and conflict error) (1). Select functions * Data transfer direction Selects MSB-first or LSB-first * SSCK clock polarity Selects "L" or "H" level when clock stops * SSCK clock phase Selects edge of data change and data download Note: 1. Synchronous serial communication unit has only one interrupt vector table.
Item Transfer data format
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24. Synchronous Serial Communication Unit (SSU)
f1
Internal clock (f1/i)
Internal clock generation circuit
Multiplexer SSCK SSMR register SSCRL register SSCRH register SCS Transmit/receive control circuit SSER register SSSR register SSMR2 register SSTDR register
Data bus
SSO Selector SSI
SSTRSR register
SSRDR register
Interrupt requests (TXI, TEI, RXI, OEI, and CEI) i = 4, 8, 16, 32, 64, 128, or 256
Figure 24.1
Block Diagram of Synchronous Serial Communication Unit
Table 24.2 Pin Name SSI SCS SSCK SSO
Pin Configuration of Synchronous Serial Communication Unit Assigned Pin P3_3, P3_4, or P1_6 P3_3 or P3_4 P3_5 P3_7 I/O I/O I/O I/O I/O Data I/O pin Chip-select signal I/O pin Clock I/O pin Data I/O pin Function
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24. Synchronous Serial Communication Unit (SSU)
24.2 24.2.1
Registers Module Standby Control Register (MSTCR)
b6 -- 0 b5 b4 b3 MSTTRC MSTTRD MSTIIC 0 0 0 b2 -- 0 b1 -- 0 b0 -- 0 R/W --
Address 0008h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4
b5 b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- 0: Active MSTIIC SSU, I2C bus standby bit 1: Standby (1) MSTTRD Peripheral function power consumption Set to 1. reduce bit The power consumption of the peripheral functions can be reduced. MSTTRC Timer RC standby bit 0: Active 1: Standby (2) -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. --
R/W R/W
R/W --
Notes: 1. When the MSTIIC bit is set to 1 (standby), any access to the SSU or the I2C bus associated registers (addresses 0193h to 019Dh) is disabled. 2. When the MSTTRC bit is set to 1 (standby), any access to the timer RC associated registers (addresses 0120h to 0133h) is disabled.
24.2.2
SSU/IIC Pin Select Register (SSUIICSR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 IICSEL 0 R/W R/W R/W -- R/W
Address 018Ch Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol IICSEL -- -- -- -- -- -- --
SSU/I2C
Function 0: SSU function selected 1: I2C bus function selected Reserved bit Set to 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0. Reserved bits Set to 0.
Bit Name bus switch bit
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24. Synchronous Serial Communication Unit (SSU)
24.2.3
SS Bit Counter Register (SSBR)
b6 -- 1 b5 -- 1 b4 -- 1 b3 BS3 1 b2 BS2 0 b1 BS1 0 Function
b3 b2 b1 b0
Address 0193h Bit b7 Symbol -- After Reset 1 Bit b0 b1 b2 b3
b0 BS0 0 R/W R/W R/W R/W R/W
Symbol Bit Name BS0 SSU data transfer length set bit (1) BS1 BS2 BS3
b4 b5 b6 b7
-- -- -- --
0 0 0 0: 16 bits 1 0 0 0: 8 bits 1 0 0 1: 9 bits 1 0 1 0: 10 bits 1 0 1 1: 11 bits 1 1 0 0: 12 bits 1 1 0 1: 13 bits 1 1 1 0: 14 bits 1 1 1 1: 15 bits Nothing is assigned. If necessary, set to 0. When read, the content is 1.
-- -- -- --
Note: 1. Do not write to bits BS0 to BS3 during SSU operation. Write to these bits when the RE bit in the SSER register is set to 0 (reception disabled) and the TE bit is set to 0 (transmission disabled).
To set the SSBR register, set the RE bit in the SSER register to 0 and the TE bit to 0.
Bits BS0 to BS3 (SSU Data Transfer Length Set Bit)
As the SSU data transfer length, 8 to 16 bits can be used.
24.2.4
SS Transmit Data Register (SSTDR)
b5 -- 1 b13 -- 1 b4 -- 1 b12 -- 1 b3 -- 1 b11 -- 1 b2 -- 1 b10 -- 1 b1 -- 1 b9 -- 1 b0 -- 1 b8 -- 1 R/W R/W
Address 0195h to 0194h Bit b7 b6 Symbol -- -- After Reset 1 1 Bit Symbol After Reset b15 -- 1 b14 -- 1
Bit Symbol Function b15 to b0 -- Store the transmit data. The stored transmit data is transferred to the SSTRSR register and transmission is started when it is detected that the SSTRSR register is empty. When the next transmit data is written to the SSTDR register during the data transmission from the SSTRSR register, the data can be transmitted continuously. When the MLS bit in the SSMR register is set to 1 (transfer data with LSB-first), the data in which MSB and LSB are reversed is read, after writing to the SSTDR register.
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24. Synchronous Serial Communication Unit (SSU)
24.2.5
SS Receive Data Register (SSRDR)
b5 -- 1 b13 -- 1 b4 -- 1 b12 -- 1 b3 -- 1 b11 -- 1 b2 -- 1 b10 -- 1 b1 -- 1 b9 -- 1 b0 -- 1 b8 -- 1 R/W R
Address 0197h to 0196h Bit b7 b6 Symbol -- -- After Reset 1 1 Bit Symbol After Reset b15 -- 1 b14 -- 1
Bit Symbol Function (1) b15 to b0 -- Store the receive data. The receive data is transferred to the SSRDR register and the receive operation is completed when 1 byte of data has been received by the SSTRSR register. At this time, the next receive operation is possible. Continuous reception is possible using registers SSTRSR and SSRDR.
Note: 1. The SSRDR register retains the data received before an overrun error occurs (ORER bit in the SSSR register set to 1 (overrun error)). When an overrun error occurs, the receive data may contain errors and therefore should be discarded.
24.2.6
SS Control Register H (SSCRH)
b6 RSSTP 0 b5 MSS 0 b4 -- 0 b3 -- 0 b2 CKS2 0 b1 CKS1 0 Function
b2 b1 b0
Address 0198h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2
b0 CKS0 0 R/W R/W R/W R/W
Symbol Bit Name CKS0 Transfer clock select bit (1) CKS1 CKS2
b3 b4 b5 b6
b7
0: Operates as slave device 1: Operates as master device 0: Maintains receive operation after receiving 1 byte of RSSTP Receive single stop bit (3) data 1: Completes receive operation after receiving 1 byte of data -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. Master/slave device select bit (2)
-- -- MSS
0 0 0: f1/256 0 0 1: f1/128 0 1 0: f1/64 0 1 1: f1/32 1 0 0: f1/16 1 0 1: f1/8 1 1 0: f1/4 1 1 1: Do not set. Nothing is assigned. If necessary, set to 0. When read, the content is 0.
-- R/W R/W
--
Notes: 1. The set clock is used when the internal clock is selected. 2. The SSCK pin functions as the transfer clock output pin when the MSS bit is set to 1 (operates as master device). The MSS bit is set to 0 (operates as slave device) when the CE bit in the SSSR register is set to 1 (conflict error occurs). 3. The RSSTP bit is disabled when the MSS bit is set to 0 (operates as slave device).
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.2.7
SS Control Register L (SSCRL)
b6 -- 1 b5 SOL 1 b4 SOLP 1 b3 -- 1 b2 -- 1 b1 SRES 0 b0 -- 1 R/W -- R/W
Address 0199h Bit b7 Symbol -- After Reset 0 Bit b0 b1
b2 b3 b4
b5
b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 1. SRES SSU control unit reset bit Writing 1 to this bit resets the SSU control unit and the SSTRSR register. The value in the SSU internal register (1) is retained. -- Nothing is assigned. If necessary, set to 0. When read, the content is 1. -- The output level can be changed by the SOL bit when SOLP SOL write protect bit (2) this bit is set to 0. The SOLP bit remains unchanged even if 1 is written to it. When read, the content is 1. SOL Serial data output value setting bit When read 0: The serial data output is set to "L". 1: The serial data output is set to "H". When written (2, 3) 0: The data output is "L" after the serial data output. 1: The data output is "H" after the serial data output. -- Nothing is assigned. If necessary, set to 0. When read, the content is 1. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0.
-- R/W
R/W
-- --
Notes: 1. Registers SSBR, SSCRH, SSCRL, SSMR, SSER, SSSR, SSMR2, SSTDR, and SSRDR. 2. The data output after serial data is output can be changed by writing to the SOL bit before or after transfer. When writing to the SOL bit, set the SOLP bit to 0 and the SOL bit to 0 or 1 simultaneously by the MOV instruction. 3. Do not write to the SOL bit during data transfer.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.2.8
SS Mode Register (SSMR)
b6 CPOS 0 b5 CPHS 0 b4 -- 1 b3 BC3 0 b2 BC2 0 b1 BC1 0 Function
b3 b2 b1 b0
Address 019Ah Bit b7 Symbol MLS After Reset 0 Bit b0 b1 b2 b3
b0 BC0 0 R/W R R R R
Symbol Bit Name BC0 Bits counter 3 to 0 BC1 BC2 BC3
b4 b5
-- CPHS
b6 b7
CPOS MLS
0 0 0 0: 16 bits left 0 0 0 1: 1 bit left 0 0 1 0: 2 bits left 0 0 1 1: 3 bits left 0 1 0 0: 4 bits left 0 1 0 1: 5 bits left 0 1 1 0: 6 bits left 0 1 1 1: 7 bits left 1 0 0 0: 8 bits left 1 0 0 1: 9 bits left 1 0 1 0: 10 bits left 1 0 1 1: 11 bits left 1 1 0 0: 12 bits left 1 1 0 1: 13 bits left 1 1 1 0: 14 bits left 1 1 1 1: 15 bits left Nothing is assigned. If necessary, set to 0. When read, the content is 1. 0: Change data at odd edge SSCK clock phase select bit (1) (Download data at even edge) 1: Change data at even edge (Download data at odd edge) 0: "H" when clock stops SSCK clock polarity select bit (1) 1: "L" when clock stops MSB first/LSB first select bit 0: Transfers data MSB first 1: Transfers data LSB first
-- R/W
R/W R/W
Note: 1. Refer to 24.3.1.1 Association between Transfer Clock Polarity, Phase, and Data for the settings of the CPHS and CPOS bits.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.2.9
SS Enable Register (SSER)
b6 TEIE 0 b5 RIE 0 b4 TE 0 b3 RE 0 b2 -- 0 b1 -- 0 b0 CEIE 0 R/W R/W -- R/W R/W R/W
Address 019Bh Bit b7 Symbol TIE After Reset 0 Bit b0 b1 b2 b3 b4 b5
Symbol Bit Name CEIE Conflict error interrupt enable bit -- -- RE TE RIE
Function 0: Disables conflict error interrupt request 1: Enables conflict error interrupt request Nothing is assigned. If necessary, set to 0. When read, the content is 0. Receive enable bit Transmit enable bit Receive interrupt enable bit 0: Disables receive 1: Enables receive 0: Disables transmit 1: Enables transmit 0: Disables receive data full and overrun error interrupt request 1: Enables receive data full and overrun error interrupt request 0: Disables transmit end interrupt request 1: Enables transmit end interrupt request 0: Disables transmit data empty interrupt request 1: Enables transmit data empty interrupt request
b6 b7
TEIE TIE
Transmit end interrupt enable bit Transmit interrupt enable bit
R/W R/W
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.2.10 SS Status Register (SSSR)
Address 019Ch Bit b7 Symbol TDRE After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b6 TEND 0 b5 RDRF 0 b4 -- 0 b3 -- 0 b2 ORER 0 b1 -- 0 b0 CE 0 R/W R/W -- R/W -- R/W R/W
Symbol Bit Name CE Conflict error flag (1) -- ORER -- -- RDRF TEND
Function 0: No conflict errors generated 1: Conflict errors generated (2) Nothing is assigned. If necessary, set to 0. When read, the content is 0. 0: No overrun errors generated Overrun error flag (1) 1: Overrun errors generated (3) Nothing is assigned. If necessary, set to 0. When read, the content is 0.
b7
TDRE
Receive data register full flag (1, 4) 0: No data in SSRDR register 1: Data in SSRDR register 0: The TDRE bit is set to 0 when transmitting the last Transmit end flag (1, 5) bit of transmit data 1: The TDRE bit is set to 1 when transmitting the last bit of transmit data 0: Data is not transferred from registers SSTDR to Transmit data empty flag (1, 5, 6) SSTRSR 1: Data is transferred from registers SSTDR to SSTRSR
R/W
Notes: 1. Writing 1 to CE, ORER, RDRF, TEND, or TDRE bits is invalid. To set any of these bits to 0, first read 1 then write 0. 2. When the serial communication is started while the SSUMS bit in the SSMR2 register is set to 1 (four-wire bus communication mode) and the MSS bit in the SSCRH register is set to 1 (operates as master device), the CE bit is set to 1 if "L" is applied to the SCS pin input. Refer to 24.5.4 SCS Pin Control and Arbitration for more information. When the SSUMS bit in the SSMR2 register is set to 1 (four-wire bus communication mode), the MSS bit in the SSCRH register is set to 0 (operates as slave device) and the SCS pin input changes the level from "L" to "H" during transfer, the CE bit is set to 1. 3. Indicates when overrun errors occur and receive completes by error reception. If the next serial data receive operation is completed while the RDRF bit is set to 1 (data in the SSRDR register), the ORER bit is set to 1. After the ORER bit is set to 1 (overrun error), receive operation is disabled while the bit remains 1. 4. The RDRF bit is set to 0 when reading out the data from the SSRDR register. 5. Bits TEND and TDRE are set to 0 when writing data to the SSTDR register. 6. The TDRE bit is set to 1 when the TE bit in the SSER register is set to 1 (transmit enabled).
If the SSSR register is accessed continuously, insert one or more NOP instructions between the instructions used for access.
REJ09B0458-0010 Rev.0.10 Page 361 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.2.11 SS Mode Register 2 (SSMR2)
Address 019Dh Bit b7 Symbol BIDE After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 SCKS 0 b5 CSS1 0 b4 CSS0 0 b3 SCKOS 0 b2 SOOS 0 b1 CSOS 0 b0 SSUMS 0 R/W R/W R/W R/W R/W R/W R/W
Symbol Bit Name SSUMS SSU mode select bit (1) SCS pin open drain output select bit SOOS Serial data pin open output drain select bit (1) SCKOS SSCK pin open drain output select bit CSS0 SCS pin select bit (2) CSS1 CSOS
Function 0: Clock synchronous communication mode 1: Four-wire bus communication mode 0: CMOS output 1: N-channel open-drain output 0: CMOS output (5) 1: N-channel open-drain output 0: CMOS output 1: N-channel open-drain output
b5 b4
b6 b7
SCKS BIDE
SSCK pin select bit Bidirectional mode enable bit (1, 4)
0 0: Functions as port 0 1: Functions as SCS input pin 1 0: Functions as SCS output pin (3) 1 1: Functions as SCS output pin (3) 0: Functions as port 1: Functions as serial clock pin 0: Standard mode (communication using 2 pins of data input and data output) 1: Bidirectional mode (communication using 1 pin of data input and data output)
R/W R/W
Notes: 1. Refer to 24.3.2.1 Association between Data I/O Pins and SS Shift Register for information on combinations of data I/O pins. 2. The SCS pin functions as a port, regardless of the values of bits CSS0 and CSS1 when the SSUMS bit is set to 0 (clock synchronous communication mode). 3. This bit functions as the SCS input pin before starting transfer. 4. The BIDE bit is disabled when the SSUMS bit is set to 0 (clock synchronous communication mode). 5. When the SOOS bit is set to 0 (CMOS output), set the port direction register bits corresponding to pins SSI and SSO to 0 (input mode).
REJ09B0458-0010 Rev.0.10 Page 362 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.3 24.3.1
Common Items for Multiple Modes Transfer Clock
The transfer clock can be selected from among seven internal clocks (f1/256, f1/128, f1/64, f1/32, f1/16, f1/8, and f1/4) and an external clock. When using synchronous serial communication unit, set the SCKS bit in the SSMR2 register to 1 and select the SSCK pin as the serial clock pin. When the MSS bit in the SSCRH register is set to 1 (operates as master device), an internal clock can be selected and the SSCK pin functions as output. When transfer is started, the SSCK pin outputs clocks of the transfer rate selected by bits CKS0 to CKS2 in the SSCRH register. When the MSS bit in the SSCRH register is set to 0 (operates as slave device), an external clock can be selected and the SSCK pin functions as input.
24.3.1.1
Association between Transfer Clock Polarity, Phase, and Data
The association between the transfer clock polarity, phase and data changes according to the combination of the SSUMS bit in the SSMR2 register and bits CPHS and CPOS in the SSMR register. Figure 24.2 shows the Association between Transfer Clock Polarity, Phase, and Transfer Data. Also, the MSB-first transfer or LSB-first transfer can be selected by setting the MLS bit in the SSMR register. When the MLS bit is set to 1, transfer is started from the LSB and proceeds to the MSB. When the MLS bit is set to 0, transfer is started from the MSB and proceeds to the LSB.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
* SSUMS = 0 (clock synchronous communication mode), CPHS bit = 0 (data change at odd edge), and CPOS bit = 0 ("H" when clock stops)
SSCK
SSO, SSI
b0
b1
b2
b3
b4
b5
b6
b7
* SSUMS = 1 (4-wire bus communication mode) and CPHS = 0 (data change at odd edge)
SSCK CPOS = 0 ("H" when clock stops) SSCK CPOS = 1 ("L" when clock stops) SSO, SSI b0 b1 b2 b3 b4 b5 b6 b7
SCS
* SSUMS = 1 (4-wire bus communication mode) and CPHS = 1 (data download at odd edge)
SSCK CPOS = 0 ("H" when clock stops) SSCK CPOS = 1 ("L" when clock stops) SSO, SSI b0 b1 b2 b3 b4 b5 b6 b7
SCS CPHS and CPOS: Bits in SSMR register, SSUMS: Bit in SSMR2 register
Figure 24.2
Association between Transfer Clock Polarity, Phase, and Transfer Data
REJ09B0458-0010 Rev.0.10 Page 364 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.3.2
SS Shift Register (SSTRSR)
The SSTRSR register is a shift register for transmitting and receiving serial data. When transmit data is transferred from the SSTDR register to the SSTRSR register and the MLS bit in the SSMR register is set to 0 (MSB-first), the bit 0 in the SSTDR register is transferred to bit 0 in the SSTRSR register. When the MLS bit is set to 1 (LSB-first), bit 7 in the SSTDR register is transferred to bit 0 in the SSTRSR register.
24.3.2.1
Association between Data I/O Pins and SS Shift Register
The connection between the data I/O pins and SSTRSR register (SS shift register) changes according to a combination of the MSS bit in the SSCRH register and the SSUMS bit in the SSMR2 register. The connection also changes according to the BIDE bit in the SSMR2 register. Figure 24.3 shows the Association between Data I/O Pins and SSTRSR Register.
* SSUMS = 0 (clock synchronous communication mode)
* SSUMS = 1 (4-wire bus communication mode), BIDE = 0 (standard mode), and MSS = 1 (operates as master device)
SSTRSR register
SSO
SSTRSR register
SSO
SSI
SSI
* SSUMS = 1 (4-wire bus communication mode), BIDE = 0 (standard mode), and MSS = 0 (operates as slave device)
* SSUMS = 1 (4-wire bus communication mode) and BIDE = 1 (bidirectional mode)
SSTRSR register
SSO
SSTRSR register
SSO
SSI
SSI
Figure 24.3
Association between Data I/O Pins and SSTRSR Register
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.3.3
Interrupt Requests
Synchronous serial communication unit has five interrupt requests: transmit data empty, transmit end, receive data full, overrun error, and conflict error. Since these interrupt requests are assigned to the synchronous serial communication unit interrupt vector table, determining interrupt sources by flags is required. Table 24.3 lists the Synchronous Serial Communication Unit Interrupt Requests. Table 24.3 Synchronous Serial Communication Unit Interrupt Requests Abbreviation TXI TEI RXI OEI CEI Generation Condition TIE = 1, TDRE = 1 TEIE = 1, TEND = 1 RIE = 1, RDRF = 1 RIE = 1, ORER = 1 CEIE = 1, CE = 1
Interrupt Request Transmit data empty Transmit end Receive data full Overrun error Conflict error
CEIE, RIE, TEIE and TIE: Bits in SSER register ORER, RDRF, TEND and TDRE: Bits in SSSR register If the generation conditions in Table 24.3 are met, a synchronous serial communication unit interrupt request is generated. Set each interrupt source to 0 by a synchronous serial communication unit interrupt routine. However, the TDRE and TEND bits are automatically set to 0 by writing transmit data to the SSTDR register and the RDRF bit is automatically set to 0 by reading the SSRDR register. In particular, the TDRE bit is set to 1 (data transmitted from registers SSTDR to SSTRSR) at the same time transmit data is written to the SSTDR register. Setting the TDRE bit to 0 (data not transmitted from registers SSTDR to SSTRSR) can cause an additional byte of data to be transmitted.
REJ09B0458-0010 Rev.0.10 Page 366 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.3.4
Communication Modes and Pin Functions
Synchronous serial communication unit switches the functions of the I/O pins in each communication mode according to the setting of the MSS bit in the SSCRH register and bits RE and TE in the SSER register. Table 24.4 lists the Association between Communication Modes and I/O Pins. Table 24.4 Association between Communication Modes and I/O Pins Bit Setting SSUMS BIDE MSS TE 0 Disabled 0 0 1 1 0 1 4-wire bus communication mode 1 0 0 0 1 1 0 1 4-wire bus 1 (bidirectional) communication mode (2) 1 0 1 0 1 0 1 RE 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 0 SSI Input - (1) Input Input - (1) Input - Output
(1)
Communication Mode Clock synchronous communication mode
Pin State SSO - (1) Output Output - Output
(1)
SSCK Input Input Input Output Output Output Input Input Input Output Output Output Input Input Output Output
Output Input - (1) Input - Output
(1)
Output Input - Input
(1)
-
(1)
Output Input Output Input Output
- (1) - (1) - (1)
Notes: 1. This pin can be used as a programmable I/O port. 2. Do not set both bits TE and RE to 1 in 4-wire bus (bidirectional) communication mode. SSUMS and BIDE: Bits in SSMR2 register MSS: Bit in SSCRH register TE and RE: Bits in SSER register
REJ09B0458-0010 Rev.0.10 Page 367 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.4 24.4.1
Clock Synchronous Communication Mode Initialization in Clock Synchronous Communication Mode
Figure 24.4 shows Initialization in Clock Synchronous Communication Mode. To initialize, set the TE bit in the SSER register to 0 (transmit disabled) and the RE bit to 0 (receive disabled) before data transmission or reception. Set the TE bit to 0 and the RE bit to 0 before changing the communication mode or format. Setting the RE bit to 0 does not change the contents of flags RDRF and ORER or the contents of the SSRDR register.
Start
SSER register
RE bit 0 TE bit 0 SSUMS bit 0
SSMR2 register
SSMR register
CPHS bit 0 CPOS bit 0 Set MLS bit
SSCRH register
Set MSS bit
SSMR2 register
SCKS bit 1 Set SOOS bit
SSCRH register
Set bits CKS0 to CKS2 Set RSSTP bit ORER bit 0 (1)
SSSR register
SSER register
RE bit 1 (receive) TE bit 1 (transmit) Set bits RIE, TEIE, and TIE
End Note: 1. Write 0 after reading 1 to set the ORER bit to 0.
Figure 24.4
Initialization in Clock Synchronous Communication Mode
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24. Synchronous Serial Communication Unit (SSU)
24.4.2
Data Transmission
Figure 24.5 shows an Example of Synchronous Serial Communication Unit Operation for Data Transmission (Clock Synchronous Communication Mode). During data transmission, the synchronous serial communication unit operates as described below. When synchronous serial communication unit is set as a master device, it outputs a synchronous clock and data. When synchronous serial communication unit is set as a slave device, it outputs data synchronized with the input clock. When the TE bit is set to 1 (transmit enabled) before writing the transmit data to the SSTDR register, the TDRE bit is automatically set to 0 (data not transferred from registers SSTDR to SSTRSR) and the data is transferred from registers SSTDR to SSTRSR. After the TDRE bit is set to 1 (data transferred from registers SSTDR to SSTRSR), transmission starts. When the TIE bit in the SSER register is set to 1, the TXI interrupt request is generated. When one frame of data is transferred while the TDRE bit is set to 0, data is transferred from registers SSTDR to SSTRSR and transmission of the next frame is started. If the 8th bit is transmitted while the TDRE bit is set to 1, the TEND bit in the SSSR register is set to 1 (the TDRE bit is set to 1 when the last bit of the transmit data is transmitted) and the state is retained. The TEI interrupt request is generated when the TEIE bit in the SSER register is set to 1 (transmit-end interrupt request enabled). The SSCK pin is fixed "H" after transmit-end. Transmission cannot be performed while the ORER bit in the SSSR register is set to 1 (overrun error). Confirm that the ORER bit is set to 0 before transmission. Figure 24.6 shows a Sample Flowchart of Data Transmission (Clock Synchronous Communication Mode). The data transfer length can be set from 8 to 16 bits using the SSBR register.
* SSUMS = 0 (clock synchronous communication mode), CPHS = 0 (data change at odd numbers), CPOS = 0 ("H" when clock stops), and BS3 to BS0 = 1000b (8 bits)
SSCK
SSO
b0
b1
b7
b0
b1
b7
1 frame TDRE bit in SSSR register 1 0 1 0 TXI interrupt request generation
1 frame TEI interrupt request generation
TEND bit in SSSR register
Processing by program
Write data to SSTDR register
BS0 to BS3: Bits in SSBR register CPHS, CPOS: Bits in SSMR register SSUMS: Bit in SSMR2 register
Figure 24.5
Example of Synchronous Serial Communication Unit Operation for Data Transmission (Clock Synchronous Communication Mode)
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R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
Start
Initialization
(1)
Read TDRE bit in SSSR register
TDRE = 1 ? Yes
No
(1) After reading the SSSR register and confirming that the TDRE bit is set to 1, write the transmit data to the SSTDR register. When the transmit data is written to the SSTDR register, the TDRE bit is automatically set to 0.
Write transmit data to SSTDR register Data transmission continues? No (3) Read TEND bit in SSSR register (3) When data transmission is completed, the TEND bit is set to 1. Set the TEND bit to 0 and the TE bit to 0 and complete transmit mode.
(2)
Yes
(2) Determine whether data transmission continues.
TEND = 1 ? Yes SSSR register
No
TEND bit 0 (1)
SSER register
TE bit 0
End
Note: 1. Write 0 after reading 1 to set the TEND bit to 0.
Figure 24.6
Sample Flowchart of Data Transmission (Clock Synchronous Communication Mode)
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Preliminary specification Specifications in this manual are tentative and subject to change.
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24. Synchronous Serial Communication Unit (SSU)
24.4.3
Data Reception
Figure 24.7 shows an Example of Synchronous Serial Communication Unit Operation for Data Reception (Clock Synchronous Communication Mode). During data reception, synchronous serial communication unit operates as described below. When the synchronous serial communication unit is set as the master device, it outputs a synchronous clock and inputs data. When synchronous serial communication unit is set as a slave device, it inputs data synchronized with the input clock. When synchronous serial communication unit is set as a master device, it outputs a receive clock and starts receiving by performing dummy read of the SSRDR register. After 8 bits of data are received, the RDRF bit in the SSSR register is set to 1 (data in the SSRDR register) and receive data is stored in the SSRDR register. When the RIE bit in the SSER register is set to 1 (RXI and OEI interrupt requests enabled), the RXI interrupt request is generated. If the SSDR register is read, the RDRF bit is automatically set to 0 (no data in the SSRDR register). Read the receive data after setting the RSSTP bit in the SSCRH register to 1 (after receiving 1 byte of data, the receive operation is completed). Synchronous serial communication unit outputs a clock for receiving 8 bits of data and stops. After that, set the RE bit in the SSER register to 0 (receive disabled) and the RSSTP bit to 0 (receive operation is continued after receiving the 1 byte of data) and read the receive data. If the SSRDR register is read while the RE bit is set to 1 (receive enabled), a receive clock is output again. When the 8th clock rises while the RDRF bit is set to 1, the ORER bit in the SSSR register is set to 1 (overrun error: OEI) and the operation is stopped. When the ORER bit is set to 1, receive cannot be performed. Confirm that the ORER bit is set to 0 before restarting receive. Figure 24.8 shows a Sample Flowchart of Data Reception (MSS = 1) (Clock Synchronous Communication Mode). The data transfer length can be set from 8 to 16 bits using the SSBR register.
* SSUMS = 0 (clock synchronous communication mode), CPHS = 0 (data download at even edges), CPOS bit = 0 ("H" when clock stops), and BS3 to BS0 = 1000b (8 bits)
SSCK
SSI
b0
b7
b0 1 frame
b7
b0
b7
1 frame RDRF bit in SSSR register
1 0 1 0
RXI interrupt request generation RXI interrupt request generation RXI interrupt request generation Dummy read in SSRDR register Read data in SSRDR register Read data in SSRDR register
RSSTP bit in SSCRH register
Processing by program
Set RSSTP bit to 1
BS0 to BS3: Bits in SSBR register CPHS, CPOS: Bits in SSMR register SSUMS: Bit in SSMR2 register
Figure 24.7
Example of Synchronous Serial Communication Unit Operation for Data Reception (Clock Synchronous Communication Mode)
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R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
Start
Initialization
(1)
Dummy read of SSRDR register
(2)
Last data received? No
Yes
(1) After setting each register in the synchronous serial communication unit register, a dummy read of the SSRDR register is performed and the receive operation is started. (2) Determine whether it is the last 1 byte of data to be received. If so, set to stop after the data is received.
Read ORER bit in SSSR register
Yes (3) ORER = 1 ? No Read RDRF bit in SSSR register (3) If a receive error occurs, perform error (6) processing after reading the ORER bit. Then set the ORER bit to 0. Transmission/reception cannot be restarted while the ORER bit is set to 1.
(4)
No
RDRF = 1 ? Yes
(4) Confirm that the RDRF bit is set to 1. If the RDRF bit is set to 1, read the receive data in the SSRDR register. When the SSRDR register is read, the RDRF bit is automatically set to 0.
Read receive data in SSRDR register
(5)
SSCRH register
RSSTP bit 1
(5) Before the last 1 byte of data is received, set the RSSTP bit to 1 and stop after the data is received.
Read ORER bit in SSSR register
(6)
ORER = 1 ? No
Yes
Read RDRF in SSSR register
No RDRF = 1 ? (7) Yes SSCRH register RSSTP bit 0
(7) Confirm that the RDRF bit is set to 1. When the receive operation is completed, set the RSSTP bit to 0 and the RE bit to 0 before reading the last 1 byte of data. If the SSRDR register is read before setting the RE bit to 0, the receive operation is restarted again. Overrun error processing
SSER register
RE bit 0
Read receive data in SSRDR register
End
Figure 24.8
Sample Flowchart of Data Reception (MSS = 1) (Clock Synchronous Communication Mode) Apr 01, 2008
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R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.4.3.1
Data Transmission/Reception
Data transmission/reception is an operation combining data transmission and reception which were described earlier. Transmission/reception is started by writing data to the SSTDR register. When the 8th clock rises or the ORER bit is set to 1 (overrun error) while the TDRE bit is set to 1 (data is transferred from registers SSTDR to SSTRSR), the transmit/receive operation is stopped. When switching from transmit mode (TE = 1) or receive mode (RE = 1) to transmit/receive mode (TE = RE = 1), set the TE bit to 0 and RE bit to 0 before switching. After confirming that the TEND bit is set to 0 (the TDRE bit is set to 0 when the last bit of the transmit data is transmitted), the RDRF bit is set to 0 (no data in the SSRDR register), and the ORER bit is set to 0 (no overrun error), set bits TE and RE to 1. Figure 24.9 shows a Sample Flowchart of Data Transmission/Reception (Clock Synchronous Communication Mode). The data transfer length can be set from 8 to 16 bits using the SSBR register.
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24. Synchronous Serial Communication Unit (SSU)
Start
Initialization
(1)
Read TDRE bit in SSSR register
TDRE = 1 ? Yes
No
(1) After reading the SSSR register and confirming that the TDRE bit is set to 1, write the transmit data to the SSTDR register. When the transmit data is written to the SSTDR register, the TDRE bit is automatically set to 0.
Write transmit data to SSTDR register
(2)
Read RDRF bit in SSSR register
No RDRF = 1 ? Yes Read receive data in SSRDR register
(2) Confirm that the RDRF bit is set to 1. If the RDRF bit is set to 1, read the receive data in the SSRDR register. When the SSRDR register is read, the RDRF bit is automatically set to 0.
(3)
Data transmission (2) continues? No
Yes
(3) Determine whether the data transmission continues
(4)
Read TEND bit in SSSR register
(4) When the data transmission is completed, the TEND bit in the SSSR register is set to 1.
TEND = 1 ? Yes (5) SSSR register
No
TEND bit 0 (1)
(5) Set the TEND bit to 0 and bits RE and TE in (6) the SSER register to 0 before ending transmit/ receive mode.
(6)
SSER register
RE bit 0 TE bit 0
End
Note: 1. Write 0 after reading 1 to set the TEND bit to 0.
Figure 24.9
Sample Flowchart of Data Transmission/Reception (Clock Synchronous Communication Mode)
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24. Synchronous Serial Communication Unit (SSU)
24.5
Operation in 4-Wire Bus Communication Mode
In 4-wire bus communication mode, a 4-wire bus consisting of a clock line, a data input line, a data output line, and a chip select line is used for communication. This mode includes bidirectional mode in which the data input line and data output line function as a single pin. The data input line and output line change according to the settings of the MSS bit in the SSCRH register and the BIDE bit in the SSMR2 register. For details, refer to 24.3.2.1 Association between Data I/O Pins and SS Shift Register. In this mode, clock polarity, phase, and data settings are performed by bits CPOS and CPHS in the SSMR register. For details, refer to 24.3.1.1 Association between Transfer Clock Polarity, Phase, and Data. When this MCU is set as the master device, the chip select line controls output. When synchronous serial communication unit is set as a slave device, the chip select line controls input. When it is set as the master device, the chip select line controls output of the SCS pin or controls output of a general port according to the setting of the CSS1 bit in the SSMR2 register. When the MCU is set as a slave device, the chip select line sets the SCS pin as an input pin by setting bits CSS1 and CSS0 in the SSMR2 register to 01b. In 4-wire bus communication mode, the MLS bit in the SSMR register is set to 0 and communication is performed MSB-first.
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24. Synchronous Serial Communication Unit (SSU)
24.5.1
Initialization in 4-Wire Bus Communication Mode
Figure 24.10 shows Initialization in 4-Wire Bus Communication Mode. Before the data transit/receive operation, set the TE bit in the SSER register to 0 (transmit disabled), the RE bit in the SSER register to 0 (receive disabled), and initialize the synchronous serial communication unit. To change the communication mode or format, set the TE bit to 0 and the RE bit to 0 before making the change. Setting the RE bit to 0 does not change the settings of flags RDRF and ORER or the contents of the SSRDR register.
Start
SSER register
RE bit 0 TE bit 0 SSUMS bit 1
SSMR2 register
(1)
SSMR register
Set bits CPHS and CPOS MLS bits 0
(1) The MLS bit is set to 0 for MSB-first transfer. The clock polarity and phase are set by bits CPHS and CPOS.
SSCRH register
Set MSS bit (2) Set the BIDE bit to 1 in bidirectional mode and set the I/O of the SCS pin by bits CSS0 and CSS1.
SSMR2 register (2)
SCKS bit 1 Set bits SOOS, CSS0 to CSS1, and BIDE
SSCRH register
Set bits CKS0 to CKS2 Set RSSTP bit ORER bit 0 (1)
SSSR register
SSER register
RE bit 1 (receive) TE bit 1 (transmit) Set bits RIE, TEIE, and TIE
End
Note: 1. Write 0 after reading 1 to set the ORER bit to 0.
Figure 24.10
Initialization in 4-Wire Bus Communication Mode
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24. Synchronous Serial Communication Unit (SSU)
24.5.2
Data Transmission
Figure 24.11 shows an Example of Synchronous Serial Communication Unit Operation during Data Transmission (4-Wire Bus Communication Mode). During the data transmit operation, synchronous serial communication unit operates as described below. When the MCU is set as the master device, it outputs a synchronous clock and data. When the MCU is set as a slave device, it outputs data in synchronization with the input clock while the SCS pin is "L". When the transmit data is written to the SSTDR register after setting the TE bit to 1 (transmit enabled), the TDRE bit is automatically set to 0 (data has not been transferred from registers SSTDR to SSTRSR) and the data is transferred from registers SSTDR to SSTRSR. After the TDRE bit is set to 1 (data is transferred from registers SSTDR to SSTRSR), transmission starts. When the TIE bit in the SSER register is set to 1, a TXI interrupt request is generated. After 1 frame of data is transferred while the TDRE bit is set to 0, the data is transferred from registers SSTDR to SSTRSR and transmission of the next frame is started. If the 8th bit is transmitted while TDRE is set to 1, TEND in the SSSR register is set to 1 (when the last bit of the transmit data is transmitted, the TDRE bit is set to 1) and the state is retained. If the TEIE bit in the SSER register is set to 1 (transmit-end interrupt requests enabled), a TEI interrupt request is generated. The SSCK pin remains "H" after transmit-end and the SCS pin is held "H". When transmitting continuously while the SCS pin is held "L", write the next transmit data to the SSTDR register before transmitting the 8th bit. Transmission cannot be performed while the ORER bit in the SSSR register is set to 1 (overrun error). Confirm that the ORER bit is set to 0 before transmission. In contrast to the clock synchronous communication mode, the SSO pin is placed in high-impedance state while the SCS pin is placed in high-impedance state when operating as a master device and the SSI pin is placed in high-impedance state while the SCS pin is placed in "H" input state when operating as a slave device. The sample flowchart is the same as that for the clock synchronous communication mode (refer to Figure 24.6 Sample Flowchart of Data Transmission (Clock Synchronous Communication Mode)). The data transfer length can be set from 8 to 16 bits using the SSBR register.
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R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
* CPHS bit = 0 (data change at odd edges), CPOS bit = 0 ("H" when clock stops), and BS3 to BS0 = 1000b (8 bits)
High-impedance SCS (output)
SSCK
SSO
b7
b6 1 frame
b0
b7
b6 1 frame
b0
TDRE bit in SSSR register
1 0 1 0
Data write to SSTDR register TXI interrupt request is generated TEI interrupt request is generated TXI interrupt request is generated
TEND bit in SSSR register
Processing by program
* CPHS bit = 1 (data change at even edges). CPOS bit = 0 ("H" when clock stops), and BS3 to BS0 = 1000b (8 bits)
High-impedance SCS (output) SSCK
SSO
b7
b6 1 frame
b0
b7 1 frame
b6
b0
TDRE bit in SSSR register
1 0 1 0
Data write to SSTDR register TXI interrupt request is generated TEI interrupt request is generated TXI interrupt request is generated
TEND bit in SSSR register
Processing by program
BS0 to BS3: Bits in SSBR register CPHS, CPOS: Bits in SSMR register
Figure 24.11
Example of Synchronous Serial Communication Unit Operation during Data Transmission (4-Wire Bus Communication Mode)
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24. Synchronous Serial Communication Unit (SSU)
24.5.3
Data Reception
Figure 24.12 shows an Example of Synchronous Serial Communication Unit Operation during Data Reception (4-Wire Bus Communication Mode). During data reception, synchronous serial communication unit operates as described below. When the MCU is set as the master device, it outputs a synchronous clock and inputs data. When the MCU is set as a slave device, it outputs data synchronized with the input clock while the SCS pin receives "L" input. When the MCU is set as the master device, it outputs a receive clock and starts receiving by performing a dummy read of the SSRDR register. After 8 bits of data are received, the RDRF bit in the SSSR register is set to 1 (data in the SSRDR register) and receive data is stored in the SSRDR register. When the RIE bit in the SSER register is set to 1 (RXI and OEI interrupt requests enabled), an RXI interrupt request is generated. When the SSRDR register is read, the RDRF bit is automatically set to 0 (no data in the SSRDR register). Read the receive data after setting the RSSTP bit in the SSCRH register to 1 (after receiving 1-byte data, the receive operation is completed). Synchronous serial communication unit outputs a clock for receiving 8 bits of data and stops. After that, set the RE bit in the SSER register to 0 (receive disabled) and the RSSTP bit to 0 (receive operation is continued after receiving 1-byte data) and read the receive data. When the SSRDR register is read while the RE bit is set to 1 (receive enabled), a receive clock is output again. When the 8th clock rises while the RDRF bit is set to 1, the ORER bit in the SSSR register is set to 1 (overrun error: OEI) and the operation is stopped. When the ORER bit is set to 1, reception cannot be performed. Confirm that the ORER bit is set to 0 before restarting reception. The timing with which bits RDRF and ORER are set to 1 varies depending on the setting of the CPHS bit in the SSMR register. Figure 24.12 shows when bits RDRF and ORER are set to 1. When the CPHS bit is set to 1 (data download at the odd edges), bits RDRF and ORER are set to 1 at some point during the frame. The sample flowchart is the same as that for the clock synchronous communication mode (refer to Figure 24.8 Sample Flowchart of Data Reception (MSS = 1) (Clock Synchronous Communication Mode)). The data transfer length can be set from 8 to 16 bits using the SSBR register.
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R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
* CPHS bit = 0 (data download at even edges), CPOS bit = 0 ("H" when clock stops), and BS3 to BS0 = 1000b (8 bits)
SCS (output) High-impedance
SSCK
SSI
b7 1 frame
b0
b7 1 frame
b0
b7
b0
RDRF bit in SSSR register
1 0 1 0
Dummy read in SSRDR register Data read in SSRDR register Set RSSTP bit to 1 RXI interrupt request is generated RXI interrupt request is generated
RSSTP bit in SSCRH register
RXI interrupt request is generated
Processing by program
Data read in SSRDR register
* CPHS bit = 1 (data download at odd edges), CPOS bit = 0 ("H" when clock stops), and BS3 to BS0 = 1000b (8 bits)
High-impedance SCS (output) SSCK
SSI
b7 1 frame
b0
b7 1 frame
b0
b7
b0
RDRF bit in SSSR register
1 0 1 0
Dummy read in SSRDR register Data read in SSRDR register Set RSSTP bit to 1 RXI interrupt request is generated RXI interrupt request is generated
RSSTP bit in SSCRH register
RXI interrupt request is generated
Processing by program
Data read in SSRDR register
BS0 to BS3: Bits in SSBR register CPHS and CPOS: Bits in SSMR register
Figure 24.12
Example of Synchronous Serial Communication Unit Operation during Data Reception (4-Wire Bus Communication Mode)
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24. Synchronous Serial Communication Unit (SSU)
24.5.4
SCS Pin Control and Arbitration
When setting the SSUMS bit in the SSMR2 register to 1 (4-wire bus communication mode) and the CSS1 bit in the SSMR2 register to 1 (functions as SCS output pin), set the MSS bit in the SSCRH register to 1 (operates as the master device) and check the arbitration of the SCS pin before starting serial transfer. If synchronous serial communication unit detects that the synchronized internal SCS signal is held "L" in this period, the CE bit in the SSSR register is set to 1 (conflict error) and the MSS bit is automatically set to 0 (operates as a slave device). Figure 24.13 shows the Arbitration Check Timing. Future transmit operations are not performed while the CE bit is set to 1. Set the CE bit to 0 (no conflict error) before starting transmission.
SCS input
Internal SCS (synchronization) MSS bit in SSCRH register 1 0
Transfer start
CE
Data write to SSTDR register
High-impedance SCS output Maximum time of SCS internal synchronization
During arbitration detection
Figure 24.13
Arbitration Check Timing
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24. Synchronous Serial Communication Unit (SSU)
24.6
Notes on Synchronous Serial Communication Unit
Set the IICSEL bit in the SSUIICSR register to 0 (select SSU function) to use the synchronous serial communication unit function.
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25. I2C bus Interface
25. I2C bus Interface
The I2C bus interface is the circuit that performs serial communication based on the data transfer format of the Philips I2C bus.
25.1
Overview
Table 25.1 lists the I2C bus Interface Specifications, Figure 25.1 shows an I2C bus interface Block Diagram, and Figure 25.2 shows the External Circuit Connection Example of Pins SCL and SDA, Table 25.2 lists the Pin Configuration of I2C bus Interface. * I2C bus is a trademark of Koninklijke Philips Electronics N. V. Table 25.1 I2C bus Interface Specifications
Item Specification Communication formats * I2C bus format - Selectable as master/slave device. - Continuous transmit/receive operation (because the shift register, transmit data register, and receive data register are independent.) - Start/stop conditions are automatically generated in master mode. - Automatic loading of the acknowledge bit during transmission - Bit synchronization/wait function (In master mode, the state of the SCL signal is monitored per bit and the timing is synchronized automatically. If the transfer is not possible yet, the SCL signal goes "L" and the interface stands by.) - Support for direct drive of pins SCL and SDA (N-channel open-drain output) * Clock synchronous serial format - Continuous transmit/receive operation (because the shift register, transmit data register, and receive data register are independent.) I/O pins SCL (I/O): Serial clock I/O pin SDA (I/O): Serial data I/O pin Transfer clocks * When the MST bit in the ICCR1 register is set to 0. External clock (input from the SCL pin) * When the MST bit in the ICCR1 register is set to 1. Internal clock selected by bits CKS0 to CKS3 in the ICCR1 register (output from the SCL pin) Receive error detection * Overrun error detection (clock synchronous serial format) Indicates an overrun error during reception. When the last bit of the next unit of data is received while the RDRF bit in the ICSR register is set to 1 (data in the ICDRR register), the AL bit is set to 1. 2C bus format .................................. 6 sources (1) Interrupt sources *I Transmit data empty (including when slave address matches), end of transmission, receive data full (including when slave address matches), arbitration lost, NACK detection, and stop condition detection * Clock synchronous serial format ...... 4 sources (1) Transmit data empty, end of transmission, receive data full, and overrun error 2C bus format Selectable functions *I - Selectable output level for the acknowledge signal during reception. * Clock synchronous serial format - MSB-first or LSB-first selectable as the data transfer direction. Note: 1. All sources use one interrupt vector for I2C bus interface.
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25. I2C bus Interface
f1
Transfer clock generation circuit Output control Transmit/receive control circuit Noise canceller ICDRT register Output control SAR register ICDRS register
Data bus
SCL
ICCR1 register ICCR2 register ICMR register
SDA
Noise canceller
Address comparison circuit
ICDRR register Bus state check circuit Arbitration check circuit ICIER register
ICSR register
Interrupt generation circuit Interrupt request (TXI, TEI, RXI, STPI, NAKI)
Figure 25.1
I2C bus interface Block Diagram
Table 25.2 Pin Name SCL SDA
Pin Configuration of I2C bus Interface Assigned Pin P3_5 P3_7 Clock I/O pin Data I/O pin Function
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R8C/32A Group
25. I2C bus Interface
VCC
VCC
SCL SCL input SCL output
SCL
SDA SDA input SDA output SCL (Master) SCL input SCL output SCL input SCL output SCL
SDA
SDA SDA input SDA output (Slave 1) SDA input SDA output (Slave 2)
SDA
Figure 25.2
External Circuit Connection Example of Pins SCL and SDA
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25. I2C bus Interface
25.2 25.2.1
Registers Module Standby Control Register (MSTCR)
b6 -- 0 b5 b4 b3 MSTTRC MSTTRD MSTIIC 0 0 0 b2 -- 0 b1 -- 0 b0 -- 0 R/W --
Address 0008h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4
b5 b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- 0: Active MSTIIC SSU, I2C bus standby bit 1: Standby (1) MSTTRD Peripheral function power consumption Set to 1. reduce bit The power consumption of the peripheral functions can be reduced. MSTTRC Timer RC standby bit 0: Active 1: Standby (2) -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. --
R/W R/W
R/W --
Notes: 1. When the MSTIIC bit is set to 1 (standby), any access to the SSU or the I2C bus associated registers (addresses 0193h to 019Dh) is disabled. 2. When the MSTTRC bit is set to 1 (standby), any access to the timer RC associated registers (addresses 0120h to 0133h) is disabled.
25.2.2
SSU/IIC Pin Select Register (SSUIICSR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 IICSEL 0 R/W R/W R/W -- R/W
Address 018Ch Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol IICSEL -- -- -- -- -- -- --
SSU/I2C
Function 0: SSU function selected 1: I2C bus function selected Reserved bit Set to 0. Nothing is assigned. If necessary, set to 0. When read, the content is 0. Reserved bits Set to 0.
Bit Name bus switch bit
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25. I2C bus Interface
25.2.3
IIC bus Transmit Data Register (ICDRT)
b6 -- 1 b5 -- 1 b4 -- 1 b3 -- 1 b2 -- 1 b1 -- 1 b0 -- 1 R/W R/W
Address 0194h Bit b7 Symbol -- After Reset 1 Bit b7 to b0
Function This register stores transmit data. When the ICDRS register is detected as empty, the stored transmit data item is transferred to the ICDRS register and data transmission starts. When the next unit of transmit data is written to the ICDRT register while data is transmitted to the ICDRS register, continuous transmission is enabled. When the MLS bit in the ICMR register is set to 1 (data transfer with LSB-first), the MSB-LSB inverted data is read after the data is written to the ICDRT register.
25.2.4
IIC bus Receive Data Register (ICDRR)
b6 -- 1 b5 -- 1 b4 -- 1 b3 -- 1 b2 -- 1 b1 -- 1 b0 -- 1 R/W R
Address 0196h Bit b7 Symbol -- After Reset 1 Bit b7 to b0
Function This register stores receive data. When the ICDRS register receives 1 byte of data, the receive data is transferred to the ICDRR register and the next receive operation is enabled.
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25. I2C bus Interface
25.2.5
IIC bus Control Register 1 (ICCR1)
b6 RCVD 0 b5 MST 0 b4 TRS 0 b3 CKS3 0 b2 CKS2 0 b1 CKS1 0 Function
b3 b2 b1 b0
Address 0198h Bit b7 Symbol ICE After Reset 0 Bit b0 b1 b2 b3
b0 CKS0 0 R/W R/W R/W R/W R/W
Symbol Bit Name CKS0 Transmit clock select bits 3 to 0 (1) CKS1 CKS2 CKS3
0 0 0 0: f1/28 0 0 0 1: f1/40 0 0 1 0: f1/48 0 0 1 1: f1/64 0 1 0 0: f1/80 0 1 0 1: f1/100 0 1 1 0: f1/112 0 1 1 1: f1/128 1 0 0 0: f1/56 1 0 0 1: f1/80 1 0 1 0: f1/96 1 0 1 1: f1/128 1 1 0 0: f1/160 1 1 0 1: f1/200 1 1 1 0: f1/224 1 1 1 1: f1/256
b5 b4
b4 b5
TRS MST
Transfer/receive select bit (2, 3, 6) Master/slave select bit (5, 6)
b6
RCVD
Receive disable bit
b7
ICE
I2C bus interface enable bit
0 0: Slave Receive Mode (4) 0 1: Slave Transmit Mode 1 0: Master Receive Mode 1 1: Master Transmit Mode After reading the ICDRR register while the TRS bit is set to 0 0: Next receive operation continues 1: Next receive operation disabled 0: This module is halted (Pins SCL and SDA are set to a port function) 1: This module is enabled for transfer operations (Pins SCL and SDA are in a bus drive state)
R/W R/W
R/W
R/W
Notes: 1. Set according to the necessary transfer rate in master mode. Refer to Table 25.3 Transfer Rate Examples for the transfer rate. This bit is used for maintaining the setup time in transmit mode of slave mode. The time is 10Tcyc when the CKS3 bit is set to 0 and 20Tcyc when the CKS3 bit is set to 1. (1Tcyc = 1/f1(s)) 2. Rewrite the TRS bit between transfer frames. 3. When the first 7 bits after the start condition in slave receive mode match the slave address set in the SAR register and the 8th bit is set to 1, the TRS bit is set to 1. 4. In master mode with the I2C bus format, if arbitration is lost, bits MST and TRS are set to 0 and the IIC enters slave receive mode. 5. When an overrun error occurs in master receive mode with the clock synchronous serial format, the MST bit is set to 0 and the I2C bus enters slave receive mode. 6. In multimaster operation, use the MOV instruction to set bits TRS and MST.
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25. I2C bus Interface
25.2.6
IIC bus Control Register 2 (ICCR2)
b6 SCP 1 b5 SDAO 1 b4 SDAOP 1 b3 SCLO 1 b2 -- 1 b1 IICRST 0 b0 -- 1 R/W -- R/W
Address 0199h Bit b7 Symbol BBSY After Reset 0 Bit b0 b1
b2 b3 b4 b5
b6
b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 1. IICRST I2C bus control block reset bit When hang-up occurs due to communication failure during I2C bus interface operation, writing 1 resets the control block of the I2C bus interface without setting ports or initializing registers. -- Nothing is assigned. If necessary, set to 0. When read, the content is 1. SCLO SCL monitor flag 0: SCL pin is set to "L" 1: SCL pin is set to "H" SDAOP SDAO write protect bit When rewriting the SDAO bit, write 0 simultaneously (1). When read, the content is 1. SDAO SDA output value control bit When read 0: SDA pin output is held "L" 1: SDA pin output is held "H" When written (1, 2) 0: SDA pin output is changed to "L" 1: SDA pin output is changed to high-impedance ("H" output via external pull-up resistor) SCP Start/stop condition generation When writing to the to BBSY bit, write 0 simultaneously (3). disable bit When read, the content is 1. Writing 1 is invalid. BBSY Bus busy bit (4) When read: 0: Bus is released (SDA signal changes from "L" to "H" while SCL signal is held "H") 1: Bus is occupied (SDA signal changes from "H" to "L" while SCL signal is held "H") When written (3): 0: Stop condition generated 1: Start condition generated
-- R R/W R/W
R/W
R/W
Notes: 1. When rewriting the SDAO bit, write 0 to the SDAOP bit simultaneously using the MOV instruction. 2. Do not write to the SDAO bit during a transfer operation. 3. Enabled in master mode. When writing to the BBSY bit, write 0 to the SCP bit simultaneously using the MOV instruction. Execute the same way when a start condition is regenerated. 4. Disabled when the clock synchronous serial format is used.
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R8C/32A Group
25. I2C bus Interface
25.2.7
IIC bus Mode Register (ICMR)
b6 WAIT 0 b5 -- 0 b4 -- 1 b3 BCWP 1 b2 BC2 0 b1 BC1 0 b0 BC0 0 R/W R/W R/W R/W
Address 019Ah Bit b7 Symbol MLS After Reset 0 Bit b0 b1 b2
Symbol Bit Name BC0 Bit counters 2 to 0 BC1 BC2
Function I2C bus format (Read: Number of remaining transfer bits; Write: Number of next transfer data bits) (1, 2).
b2 b1 b0
0 0 0: 9 bits (3) 0 0 1: 2 bits 0 1 0: 3 bits 0 1 1: 4 bits 1 0 0: 5 bits 1 0 1: 6 bits 1 1 0: 7 bits 1 1 1: 8 bits Clock synchronous serial format (Read: Number of remaining transfer bits; Write: Always 000b).
b2 b1 b0
b3 b4 b5 b6
BCWP -- -- WAIT
b7
MLS
0 0 0: 8 bits 0 0 1: 1 bit 0 1 0: 2 bits 0 1 1: 3 bits 1 0 0: 4 bits 1 0 1: 5 bits 1 1 0: 6 bits 1 1 1: 7 bits BC write protect bit When rewriting bits BC0 to BC2, write 0 simultaneously (2, 4). When read, the content is 1. Nothing is assigned. If necessary, set to 0. When read, the content is 1. Reserved bit Set to 0. 0: No wait states Wait insertion bit (5) (Data and the acknowledge bit are transferred consecutively) 1: Wait state (After the clock of the last data bit falls, a "L" period is extended for two transfer clocks) MSB-first/LSB-first 0: Data transfer with MSB-first (6) select bit 1: Data transfer with LSB-first
R/W -- R/W R/W
R/W
Notes: 1. Rewrite between transfer frames. When writing values other than 000b, write when the SCL signal is "L". 2. When writing to bits BC0 to BC2, write 0 to the BCWP bit simultaneously using the MOV instruction. 3. After data including the acknowledge bit is transferred, these bits are automatically set to 000b. When a start condition is detected, these bits are automatically set to 000b. 4. Do not rewrite when the clock synchronous serial format is used. 5. The setting value is valid in master mode with the I2C bus format. It is invalid in slave mode with the I2C bus format or when the clock synchronous serial format is used. 6. Set to 0 when the I2C bus format is used.
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Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.2.8
IIC bus Interrupt Enable Register (ICIER)
b6 TEIE 0 b5 RIE 0 b4 NAKIE 0 b3 STIE 0 b2 ACKE 0 b1 ACKBR 0 b0 ACKBT 0 R/W R/W R
Address 019Bh Bit b7 Symbol TIE After Reset 0 Bit b0 b1
Symbol Bit Name ACKBT Transmit acknowledge select bit ACKBR Receive acknowledge bit
b2
ACKE
Acknowledge bit detection select bit
b3 b4
STIE NAKIE
Stop condition detection interrupt enable bit NACK receive interrupt enable bit
b5
RIE
Receive interrupt enable bit
b6 b7
TEIE TIE
Transmit end interrupt enable bit Transmit interrupt enable bit
Function 0: In receive mode, 0 is transmitted as the acknowledge bit. 1: In receive mode, 1 is transmitted as the acknowledge bit. 0: In transmit mode, the acknowledge bit received from receive device is set to 0. 1: In transmit mode, the acknowledge bit received from receive device is set to 1. 0: Content of the receive acknowledge bit is ignored and continuous transfer is performed. 1: When the receive acknowledge bit is set to 1, continuous transfer is halted. 0: Stop condition detection interrupt request disabled 1: Stop condition detection interrupt request enabled (2) 0: NACK receive interrupt request and arbitration lost/ overrun error interrupt request disabled 1: NACK receive interrupt request and arbitration lost/ overrun error interrupt request (1) 0: Receive data full and overrun error interrupt request disabled 1: Receive data full and overrun error interrupt request enabled (1) 0: Transmit end interrupt request disabled 1: Transmit end interrupt request enabled 0: Transmit data empty interrupt request disabled 1: Transmit data empty interrupt request enabled
R/W
R/W R/W
R/W
R/W R/W
Notes: 1. An overrun error interrupt request is generated when the clock synchronous format is used. 2. Set the STIE bit to 1 (stop condition detection interrupt request enabled) when the STOP bit in the ICSR register is set to 0.
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Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.2.9
IIC bus Status Register (ICSR)
b6 TEND 0 b5 RDRF 0 b4 NACKF 0 b3 STOP X b2 AL 0 b1 AAS 0 b0 ADZ 0 R/W R/W R/W
Address 019Ch Bit b7 Symbol TDRE After Reset 0 Bit b0 b1
Symbol Bit Name ADZ General call address recognition flag (1, 2) AAS Slave address recognition flag (1)
b2
AL
Arbitration lost flag/overrun error flag (1)
b3 b4 b5 b6
STOP
Stop condition detection flag (1)
NACKF No acknowledge detection flag (1, 4) RDRF Receive data register full flag
(1, 5)
TEND
Transmit end flag (1, 6)
b7
TDRE
Transmit data empty flag (1, 6)
Function This flag is set to 1 when a general call address is detected. This flag is set to 1 when the first frame immediately after the start condition matches bits SVA0 to SVA6 in the SAR register in slave receive mode (slave address detection and general call address detection) I2C bus format: This flag indicates that arbitration has been lost in master mode. This flag is set to 1 (3) when: * The internal SDA signal and SDA pin level do not match at the rising edge of the SCL signal in master transmit mode * The SDA pin is held "H" at start condition detection in master transmit/receive mode Clock synchronous format: This flag indicates an overrun error. This flag is set to 1 when: * The last bit of the next unit of data is received while the RDRF bit is set to 1 This flag is set to 1 when a stop condition is detected after the frame is transferred. This flag is set to 1 when no ACKnowledge is detected from the receive device after transmission. This flag is set to 1 when receive data is transferred from registers ICDRS to ICDRR. I2C bus format: This flag is set to 1 at the rising edge of the 9th clock cycle of the SCL signal while the TDRE bit is set to 1. Clock synchronous format: This flag is set to 1 when the last bit of the transmit frame is transmitted. This flag is set to 1 when: * Data is transferred from registers ICDRT to ICDRS and the CDRT register is empty * The TRS bit in the ICCR1 register is set to 1 (transmit mode) * A start condition is generated (including retransmission) * Slave receive mode is changed to slave transmit mode
R/W
R/W R/W R/W R/W
R/W
Notes: 1. Each bit is set to 0 by reading 1 before writing 0. 2. This flag is enabled in slave receive mode with the I2C bus format. 3. When two or more master devices attempt to occupy the bus at nearly the same time, if the I2C bus Interface monitors the SDA pin and the data which the I2C bus Interface transmits is different, the AL flag is set to 1 and the bus is occupied by another master. 4. The NACKF bit is enabled when the ACKE bit in the ICIER register is set to 1 (when the receive acknowledge bit is set to 1, transfer is halted). 5. The RDRF bit is set to 0 when data is read from the ICDRR register. 6. Bits TEND and TDRE are set to 0 when data is written to the ICDRT register.
When accessing the ICSR register continuously, insert one or more NOP instructions between the instructions to access it. REJ09B0458-0010 Rev.0.10 Page 392 of 572 Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.2.10 Slave Address Register (SAR)
Address 019Dh Bit b7 Symbol SVA6 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 b6 SVA5 0 b5 SVA4 0 b4 SVA3 0 b3 SVA2 0 b2 SVA1 0 b1 SVA0 0 b0 FS 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Symbol Bit Name FS Format select bit SVA0 SVA1 SVA2 SVA3 SVA4 SVA5 SVA6 Slave addresses 6 to 0
Function 0: I2C bus format 1: Clock synchronous serial format Set an address different from that of the other slave devices connected to the I2C bus. When the 7 high-order bits of the first frame transmitted after the start condition match bits SVA0 to SVA6 in slave mode of the I2C bus format, the MCU operates as a slave device.
25.2.11 IIC bus Shift Register (ICDRS)
Bit Symbol b7 -- b6 -- b5 -- b4 -- b3 -- b2 -- b1 -- b0 --
Bit b7 to b0
Function This register transmits and receives data. During transmission, data is transferred from registers ICRDT to ICDRS and transmitted from the SDA pin. During reception, data is transferred from registers ICDRS to the ICDRR after 1 byte of data reception ends.
R/W --
REJ09B0458-0010 Rev.0.10 Page 393 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.3 25.3.1
Common Items for Multiple Modes Transfer Clock
When the MST bit in the ICCR1 register is set to 0, the transfer clock is the external clock input from the SCL pin. When the MST bit in the ICCR1 register is set to 1, the transfer clock is the internal clock selected by bits CKS0 to CKS3 in the ICCR1 register and the transfer clock is output from the SCL pin. Table 25.3 lists the Transfer Rate Examples. Table 25.3 Transfer Rate Examples
ICCR1 Register Transfer Transfer Rate CKS3 CKS2 CKS1 CKS0 Clock f1 = 5 MHz f1 = 8 MHz f1 = 10 MHz f1 = 16 MHz f1 = 20 MHz 0 0 0 0 f1/28 179 kHz 286 kHz 357 kHz 571 kHz 714 kHz 1 f1/40 125 kHz 200 kHz 250 kHz 400 kHz 500 kHz 1 0 f1/48 104 kHz 167 kHz 208 kHz 333 kHz 417 kHz 1 f1/64 78.1 kHz 125 kHz 156 kHz 250 kHz 313 kHz 1 0 0 f1/80 62.5 kHz 100 kHz 125 kHz 200 kHz 250 kHz 1 f1/100 50.0 kHz 80.0 kHz 100 kHz 160 kHz 200 kHz 1 0 f1/112 44.6 kHz 71.4 kHz 89.3 kHz 143 kHz 179 kHz 1 f1/128 39.1 kHz 62.5 kHz 78.1 kHz 125 kHz 156 kHz 1 0 0 0 f1/56 89.3 kHz 143 kHz 179 kHz 286 kHz 357 kHz 1 f1/80 62.5 kHz 100 kHz 125 kHz 200 kHz 250 kHz 1 0 f1/96 52.1 kHz 83.3 kHz 104 kHz 167 kHz 208 kHz 1 f1/128 39.1 kHz 62.5 kHz 78.1 kHz 125 kHz 156 kHz 1 0 0 f1/160 31.3 kHz 50.0 kHz 62.5 kHz 100 kHz 125 kHz 1 f1/200 25.0 kHz 40.0 kHz 50.0 kHz 80.0 kHz 100 kHz 1 0 f1/224 22.3 kHz 35.7 kHz 44.6 kHz 71.4 kHz 89.3 kHz 1 f1/256 19.5 kHz 31.3 kHz 39.1 kHz 62.5 kHz 78.1 kHz
REJ09B0458-0010 Rev.0.10 Page 394 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.3.2
I 2C
Interrupt Requests
The bus interface has six interrupt requests when the I2C bus format is used and four interrupt requests when the clock synchronous serial format is used. Table 25.4 lists the Interrupt Requests of I2C bus Interface. Because these interrupt requests are allocated at the I2C bus interface interrupt vector table, the source must be determined bit by bit. Table 25.4 Interrupt Requests of I2C bus Interface Format Interrupt Request Transmit data empty Transmit ends Receive data full Stop condition detection NACK detection Arbitration lost/overrun error TXI TEI RXI STPI NAKI Generation Condition TIE = 1 and TDRE = 1 TEIE = 1 and TEND = 1 RIE = 1 and RDRF = 1 STIE = 1 and STOP = 1 NAKIE = 1 and AL = 1 (or NAKIE = 1 and NACKF = 1) I2C bus Enabled Enabled Enabled Enabled Enabled Enabled Clock Synchronous Serial Enabled Enabled Enabled Disabled Disabled Enabled
STIE, NAKIE, RIE, TEIE, TIE: Bits in ICIER register AL, STOP, NACKF, RDRF, TEND, TDRE: Bits in ICSR register When generation conditions listed in Table 25.4 are met, an I2C bus interface interrupt request is generated. Set the interrupt generation conditions to 0 by the I2C bus interface interrupt routine. Note that bits TDRE and TEND are automatically set to 0 by writing transmit data to the ICDRT register and that the RDRF bit is automatically set to 0 by reading the ICDRR register. Especially, the TDRE bit is set to 0 when writing transmit data to the ICDRT register and set to 1 when transferring data from the ICDRT register to the ICDRS register. If the TDRE bit is further set to 0, additional 1 byte may be transmitted. Also, set the STIE bit to 1 (stop condition detection interrupt request enabled) when the STOP bit is set to 0.
REJ09B0458-0010 Rev.0.10 Page 395 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.4 25.4.1
I2C bus Interface Mode I2C bus Format
When the FS bit in the SAR register is set to 0, the I2C bus format is used for communication. Figure 25.3 shows the I2C bus Format and Bus Timing. The first frame following the start condition consists of 8 bits.
(1) I2C bus format (a) I2C bus format (FS = 0)
S 1 SLA 7 1 R/W 1 A 1 DATA n A 1 m A/A 1 P 1 Number of transfer bits (n = 1 to 8) Number of transfer frames (m = 1 or more)
(b) I2C bus format When Start Condition is Retransmitted (FS = 0)
S 1 SLA 7 1 R/W 1 A 1 DATA n1 m1 A/A 1 S 1 SLA 7 1 R/W 1 A 1 DATA n2 m2 A/A 1 P 1
Upper: Number of transfer bits (n1, n2 = 1 to 8) Lower: Number of transfer frames (m1, m2 = 1 or more)
(2) I2C bus timing
SDA
SCL
1 to 7
8
9
1 to 7
8
9
1 to 7
8
9
S SLA R/W A DATA A Legend: S : Start condition The master device changes the SDA signal from "H" to "L" while the SCL signal is held "H". SLA : Slave address R/W : Indicates the direction of data transmission/reception Data is transmitted when: R/W value is 1: From the slave device to the master device R/W value is 0: From the master device to the slave device A : Acknowledge The receive device sets the SDA signal to "L". DATA : Transmit/receive data P : Stop condition The master device changes the SDA signal from "L" to "H" while the SCL signal is held "H".
DATA
A
P
Figure 25.3
I2C bus Format and Bus Timing
REJ09B0458-0010 Rev.0.10 Page 396 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.4.2
Master Transmit Operation
In master transmit mode, the master device outputs the transmit clock and data, and the slave device returns an acknowledge signal. Figures 25.4 and 25.5 show the Operating Timing in Master Transmit Mode (I2C bus Interface Mode). The transmit procedure and operation in master transmit mode are as follows. (1) Set the STOP bit in the ICSR register to 0 for initialization, and set the ICE bit in the ICCR1 register to 1 (transfer operation enabled). Then, set bits WAIT and MLS in the ICMR register and bits CKS0 to CKS3 in the ICCR1 register (initial setting). (2) After confirming that the bus is released by reading the BBSY bit in the ICCR2 register, set bits TRS and MST in the ICCR1 register to master transmit mode. Then, write 1 to the BBSY bit and 0 to the SCP bit with the MOV instruction (start condition generated). This will generate a start condition. (3) After confirming that the TDRE bit in the ICSR register is set to 1 (data is transferred from registers ICDRT to ICDRS), write transmit data to the ICDRT register (data in which a slave address and R/W are indicated in the 1st byte). At this time, the TDRE bit is automatically set to 0. When data is transferred from registers ICDRT to ICDRS, the TDRE bit is set to 1 again. (4) When 1 byte of data transmission is completed while the TDRE bit is set to 1, the TEND bit in the ICSR register is set to 1 at the rising edge of the 9th clock cycle of the transmit clock. After confirming that the slave device is selected by reading the ACKBR bit in the ICIER register, write the 2nd byte of data to the ICDRT register. Since the slave device is not acknowledged when the ACKBR bit is set to 1, generate a stop condition. Stop condition generation is enabled by writing 0 to the BBSY bit and 0 to the SCP bit with the MOV instruction. The SCL signal is fixed "L" until data is ready or a stop condition is generated. (5) Write the transmit data after the 2nd byte to the ICDRT register every time the TDRE bit is set to 1. (6) When the number of bytes to be transmitted is written to the ICDRT register, wait until the TEND bit is set to 1 while the TDRE bit is set to 1. Or wait for NACK (NACKF bit in ICSR register = 1) from the receive device while the ACKE bit in the ICIER register is set to 1 (when the receive acknowledge bit is set to 1, transfer is halted). Then, generate a stop condition before setting the TEND bit or the NACKF bit to 0. (7) When the STOP bit in the ICSR register is set to 1, return to slave receive mode.
REJ09B0458-0010 Rev.0.10 Page 397 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
SCL (master output)
1
2
3
4
5
6
7
8
9
1
2
SDA (master output)
b7
b6
b5
b4
b3
b2
b1
b0
b7
b6
Slave address SDA (slave output)
R/W A
TDRE bit in ICSR register
1 0
TEND bit in ICSR register
1 0
ICDRT register
Address + R/W
Data 1
Data 2
ICDRS register
Address + R/W
Data 1
Program processing (2) Instruction for start condition generation
(3) Write data to ICDRT register (1st byte).
(4) Write data to ICDRT register (2nd byte).
(5) Write data to ICDRT register (3rd byte).
Figure 25.4
Operating Timing in Master Transmit Mode (I2C bus Interface Mode) (1)
SCL (master output)
9
1
2
3
4
5
6
7
8
9
SDA (master output)
b7
b6
b5
b4
b3
b2
b1
b0
SDA (slave output)
A
A/A
TDRE bit in ICSR register
1 0
TEND bit in ICSR register
1 0
ICDRT register
Data n
ICDRS register
Data n
Program processing
(3) Write data to ICDRT register.
(6) Generate a stop condition and set TEND bit to 0. (7) Set to slave receive mode.
Figure 25.5
Operating Timing in Master Transmit Mode (I2C bus Interface Mode) (2)
REJ09B0458-0010 Rev.0.10 Page 398 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.4.3
Master Receive Operation
In master receive mode, the master device outputs the receive clock, receives data from the slave device, and returns an acknowledge signal. Figures 25.6 and 25.7 show the Operating Timing in Master Receive Mode (I2C bus Interface Mode). The receive procedure and operation in master receive mode are shown below. (1) After setting the TEND bit in the ICSR register to 0, set the TRS bit in the ICCR1 register to 0 to switch from master transmit mode to master receive mode. Then set the TDRE bit in the ICSR register to 0. (2) Dummy reading the ICDRR register starts receive operation. The receive clock is output in synchronization with the internal clock and data is received. The master device outputs the level set by the ACKBT bit in the ICIER register to the SDA pin at the rising edge of the 9th clock cycle of the receive clock. (3) When 1-frame of data reception is completed, the RDRF bit in the ICSR register is set to 1 at the rising edge of the 9th clock cycle of the receive clock. At this time, if the ICDRR register is read, the received data can be read and the RDRF bit is set to 0 simultaneously. (4) Continuous receive operation is enabled by reading the ICDRR register every time the RDRF bit is set to 1. If reading the ICDRR register is delayed by another process and the 8th clock cycle falls while the RDRF bit is set to 1, the SCL signal is fixed "L" until the ICDRR register is read. (5) If the next frame is the last receive frame and the RCVD bit in the ICCR1 register is set to 1 (next receive operation disabled) before reading the ICDRR register, stop condition generation is enabled after the next receive operation. (6) When the RDRF bit is set to 1 at the rising edge of the 9th clock cycle of the receive clock, generate a stop condition. (7) When the STOP bit in the ICSR register is set to 1, read the ICDRR register and set the RCVD bit to 0 (next receive operation continues). (8) Return to slave receive mode.
REJ09B0458-0010 Rev.0.10 Page 399 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
Master transmit mode SCL (master output)
Master receive mode
9
1
2
3
4
5
6
7
8
9
1
SDA (master output)
A
SDA (slave output)
A
b7
b6
b5
b4
b3
b2
b1
b0
b7
TDRE bit in ICSR register
1 0
TEND bit in ICSR register
1 0 1 0 1 0
TRS bit in ICCR1 register
RDRF bit in ICSR register
ICDRS register
Data 1
ICDRR register
Data 1
Program processing
(1) After setting bits TEND and TRS to 0, set TDRE bit to 0.
(2) Read ICDRR register.
(3) Read ICDRR register.
Figure 25.6
Operating Timing in Master Receive Mode (I2C bus Interface Mode) (1)
REJ09B0458-0010 Rev.0.10 Page 400 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
SCL (master output)
9
1
2
3
4
5
6
7
8
9
SDA (master output)
A
A/A
SDA (slave output)
b7
b6
b5
b4
b3
b2
b1
b0
RDRF bit in ICSR register
1 0 1 0
RCVD bit in ICCR1 register
ICDRS register
Data n-1
Data n
ICDRR register
Data n-1
Data n
Program processing
(5) Read ICDRR register after setting RCVD bit to 1.
(6) Generate a stop condition.
(7) Set RCVD bit to 0 after reading ICDRR register. (8) Set to slave receive mode.
Figure 25.7
Operating Timing in Master Receive Mode (I2C bus Interface Mode) (2)
REJ09B0458-0010 Rev.0.10 Page 401 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.4.4
Slave Transmit Operation
In slave transmit mode, the slave device outputs the transmit data while the master device outputs the receive clock and returns an acknowledge signal. Figures 25.8 and 25.9 show the Operating Timing in Slave Transmit Mode (I2C bus Interface Mode). The transmit procedure and operation in slave transmit mode are as follows. (1) Set the ICE bit in the ICCR1 register to 1 (transfer operation enabled), and set bits WAIT and MLS in the ICMR register and bits CKS0 to CKS3 in the ICCR1 register (initial setting). Then, set bits TRS and MST in the ICCR1 register to 0 and wait until the slave address matches in slave receive mode. (2) When the slave address matches at the first frame after detecting the start condition, the slave device outputs the level set by the ACKBT bit in the ICIER register to the SDA pin at the rising edge of the 9th clock cycle. At this time, if the 8th bit of data (R/W) is 1, bits TRS and TDRE in the ICSR register are set to 1, and the mode is switched to slave transmit mode automatically. Continuous transmission is enabled by writing transmit data to the ICDRT register every time the TDRE bit is set to 1. (3) When the TDRE bit in the ICDRT register is set to 1 after the last transmit data is written to the ICDRT register, wait until the TEND bit in the ICSR register is set to 1 while the TDRE bit is set to 1. When the TEND bit is set to 1, set the TEND bit to 0. (4) Set the TRS bit to 0 and dummy read the ICDRR register to end the process. This will release the SCL signal. (5) Set the TDRE bit to 0.
REJ09B0458-0010 Rev.0.10 Page 402 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
Slave receive mode SCL (master output)
Slave transmit mode
9
1
2
3
4
5
6
7
8
9
1
SDA (master output)
A
SCL (slave output)
SDA (slave output)
A
b7
b6
b5
b4
b3
b2
b1
b0
b7
TDRE bit in ICSR register
1 0 1 0 1 0
TEND bit in ICSR register
TRS bit in ICCR1 register
ICDRT register
Data 1
Data 2
Data 3
ICDRS register
Data 1
Data 2
ICDRR register
Program Processing
(1) Write data to ICDRT register (data 1).
(2) Write data to ICDRT register (data 2).
(2) Write Data to ICDRT register (data 3).
Figure 25.8
Operating Timing in Slave Transmit Mode (I2C bus Interface Mode) (1)
REJ09B0458-0010 Rev.0.10 Page 403 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
Slave receive mode Slave transmit mode SCL (master output)
9
1
2
3
4
5
6
7
8
9
SDA (master output)
A
A
SCL (slave output)
SDA (slave output)
b7
b6
b5
b4
b3
b2
b1
b0
TDRE bit in ICSR register
1 0
TEND bit in ICSR register
1 0 1 0
TRS bit in ICCR1 register
ICDRT register
Data n
ICDRS register
Data n
ICDRR register
Program processing
(3) Set TEND bit to 0.
(4) Dummy read ICDRR register after setting TRS bit to 0.
(5) Set TDRE bit to 0.
Figure 25.9
Operating Timing in Slave Transmit Mode (I2C bus Interface Mode) (2)
REJ09B0458-0010 Rev.0.10 Page 404 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.4.5
Slave Receive Operation
In slave receive mode, the master device outputs the transmit clock and data, and the slave device returns an acknowledge signal. Figures 25.10 and 25.11 show the Operating Timing in Slave Receive Mode (I2C bus Interface Mode). The receive procedure and operation in slave receive mode are as follows. (1) Set the ICE bit in the ICCR1 register to 1 (transfer operation enabled), and set bits WAIT and MLS in the ICMR register and bits CKS0 to CKS3 in the ICCR1 register (initial setting). Then, set bits TRS and MST in the ICCR1 register to 0 and wait until the slave address matches in slave receive mode. (2) When the slave address matches at the first frame after detecting the start condition, the slave device outputs the level set in the ACKBT bit in the ICIER register to the SDA pin at the rising edge of the 9th clock cycle. Since the RDRF bit in the ICSR register is set to 1 simultaneously, dummy read the ICDRR register (the read data is unnecessary because it indicates the slave address and R/W). (3) Read the ICDRR register every time the RDRF bit is set to 1. If the 8th clock cycle falls while the RDRF bit is set to 1, the SCL signal is fixed "L" until the ICDRR register is read. The setting change of the acknowledge signal returned to the master device before reading the ICDRR register takes affect from the following transfer frame. (4) Reading the last byte is also performed by reading the ICDRR register.
REJ09B0458-0010 Rev.0.10 Page 405 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
SCL (master output)
9
1
2
3
4
5
6
7
8
9
1
SDA (master output)
b7
b6
b5
b4
b3
b2
b1
b0
b7
SCL (slave output)
SDA (slave output)
A
A
RDRF bit in ICSR register
1 0
ICDRS register
Data 1
Data 2
ICDRR register
Data 1
Program processing
(2) Dummy read ICDRR register.
(2) Read ICDRR register.
Figure 25.10
Operating Timing in Slave Receive Mode (I2C bus Interface Mode) (1)
SCL (master output)
9
1
2
3
4
5
6
7
8
9
SDA (master output)
b7
b6
b5
b4
b3
b2
b1
b0
SCL (slave output)
SDA (slave output)
A
A
RDRF bit in ICSR register
1 0
ICDRS register
Data 1
Data 2
ICDRR register
Data 1
Program processing
(3) Set ACKBT bit to 1.
(3) Read ICDRR register.
(4) Read ICDRR register.
Figure 25.11
Operating Timing in Slave Receive Mode (I2C bus Interface Mode) (2)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.5 25.5.1
Clock Synchronous Serial Mode Clock Synchronous Serial Format
When the FS bit in the SAR register is set to 1, the clock synchronous serial format is used for communication. Figure 25.12 shows the Transfer Format of Clock Synchronous Serial Format. When the MST bit in the ICCR1 register is set to 1, the transfer clock is output from the SCL pin. When the MST bit is set to 0, the external clock is input. The transfer data is output between successive falling edges of the SCL clock, and data is determined at the rising edge of the SCL clock. MSB-first or LSB-first can be selected as the order of the data transfer by setting the MLS bit in the ICMR register. The SDA output level can be changed by the SDAO bit in the ICCR2 register during transfer standby.
SCL
SDA
b0
b1
b2
b3
b4
b5
b6
b7
Figure 25.12
Transfer Format of Clock Synchronous Serial Format
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.5.2
Transmit Operation
In transmit mode, transmit data is output from the SDA pin in synchronization with the falling edge of the transfer clock. The transfer clock is output when the MST bit in the ICCR1 register is set to 1 and input when the MST bit is set to 0. Figure 25.13 shows the Operating Timing in Transmit Mode (Clock Synchronous Serial Mode). The transmit procedure and operation in transmit mode are as follows. (1) Set the ICE bit in the ICCR1 register to 1 (transfer operation enabled). Then set bits CKS0 to CKS3 in the ICCR1 register and the MST bit (initial setting). (2) Set the TRS bit in the ICCR1 register to 1 to select transmit mode. This will set the TDRE bit in the ICSR register is to 1. (3) After confirming that the TDRE bit is set to 1, write transmit data to the ICDRT register. Data is transferred from registers ICDRT to ICDRS and the TDRE bit is automatically set to 1. Continuous transmission is enabled by writing data to the ICDRT register every time the TDRE bit is set to 1. To switch from transmit to receive mode, set the TRS bit to 0 while the TDRE bit is set to 1.
SCL
1
2
7
8
1
7
8
1
SDA (output)
b0
b1
b6
b7
b0
b6
b7
b0
TRS bit in ICCR1 register
1 0 1 0
TDRE bit in ICSR register
ICDRT register
Data 1
Data 2
Data 3
ICDRS register
Data 1
Data 2
Data 3
Program processing
(3) Write data to ICDRT register.
(3) Write data to ICDRT register.
(3) Write data to ICDRT register.
(3) Write data to ICDRT register.
(2) Set TRS bit to 1.
Figure 25.13
Operating Timing in Transmit Mode (Clock Synchronous Serial Mode)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.5.3
Receive Operation
In receive mode, data is latched at the rising edge of the transfer clock. The transfer clock is output when the MST bit in the ICCR1 register is set to 1 and input when the MST bit is set to 0. Figure 25.14 shows the Operating Timing in Receive Mode (Clock Synchronous Serial Mode). The receive procedure and operation in receive mode are as follows. (1) Set the ICE bit in the ICCR1 register to 1 (transfer operation enabled). Then set bits CKS0 to CKS3 in the ICCR1 register and the MST bit (initial setting). (2) Set the MST bit to 1 while the transfer clock is being output. This will start the output of the receive clock. (3) When the receive operation is completed, data is transferred from registers ICDRS to ICDRR and the RDRF bit in the ICSR register is set to 1. When the MST bit is set to 1, the clock is output continuously since the next byte of data is enabled for reception. Continuous reception is enabled by reading the ICDRR register every time the RDRF bit is set to 1. If the 8th clock cycle falls while the RDRF bit is set to 1, an overrun is detected and the AL bit in the ICSR register is set to 1. At this time, the last receive data is retained in the ICDRR register. (4) When the MST bit is set to 1, set the RCVD bit in the ICCR1 register to 1 (next receive operation disabled) and read the ICDRR register. The SCL signal is fixed "H" after the following byte of data reception is completed.
SCL
1
2
7
8
1
7
8
1
2
SDA (input)
b0
b1
b6
b7
b0
b6
b7
b0
MST bit in ICCR1 register
1 0 1 0
TRS bit in ICCR1 register
RDRF bit in ICSR register
1 0
ICDRS register
Data 1
Data 2
Data 3
ICDRR register
Data 1
Data 2
Program processing
(2) Set MST bit to 1 (when transfer clock is output).
(3) Read ICDRR register.
(3) Read ICDRR register.
Figure 25.14
Operating Timing in Receive Mode (Clock Synchronous Serial Mode)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.6
Examples of Register Setting
Figures 25.15 to 25.18 show Examples of Register Setting When Using I2C bus interface.
Start Initial setting Read BBSY bit in ICCR2 register * Set the STOP bit in the ICSR register to 0. * Set the IICSEL bit in the PMR register to 1. * Set the MSTIIC bit in the MSTCR register to 0. (1) Determine the state of the SCL and SDA lines. (2) Set to master transmit mode. No (1) BBSY = 0? Yes ICCR1 register TRS bit 1 MST bit 1 SCP bit 0 BBSY bit 1 (2) (3) Generate a start condition. (4) Set the transmit data of the 1st byte (slave address + R/W). (5) Wait until 1 byte of data is transmitted. (6) Determine the ACKBR bit from the specified slave device. (7) Set the transmit data after 2nd byte (except the last byte). (8) Wait until the ICRDT register is empty. (9) Set the transmit data of the last byte. No (5) TEND = 1? (10) Wait for end of transmission of the last byte. (11) Set the TEND bit to 0. (12) Set the STOP bit to 0. (6) (13) Generate a stop condition. (14) Wait until a stop condition is generated. (15) Set to slave receive mode. Set the TDRE bit to 0. No Master receive mode
ICCR2 register
(3)
Write transmit data to ICDRT register Read TEND bit in ICSR register
(4)
Yes Read ACKBR bit in ICIER register
ACKBR = 0? Yes Transmit mode? Yes
No
Write transmit data to ICDRT register Read TDRE bit in ICSR register
(7)
No
(8) TDRE = 1? Yes
No
Last byte? (9) Yes
Write transmit data to ICDRT register Read TEND bit in ICSR register (10) TEND = 1? Yes ICSR register ICSR register ICCR2 register TEND bit 0 STOP bit 0 SCP bit 0 BBSY bit 0 (11) (12) (13)
No
Read STOP bit in ICSR register (14) STOP = 1? Yes ICCR1 register TRS bit 0 MST bit 0 (15) ICSR register TDRE bit 0 End
No
Figure 25.15
Register Setting Example in Master Transmit Mode (I2C bus Interface Mode) Apr 01, 2008
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
Master receive mode ICSR register ICCR1 register ICSR register ICIER register TEND bit 0 TRS bit 0 TDRE bit 0 ACKBT bit 0 (2) (3) (1) (1) Set the TEND bit to 0 and set to master receive mode. Set the TDRE bit to 0. (1,2) (2) Set the ACKBT bit to the transmit device. (3) Dummy read the ICDRR register. (1) (4) Wait until 1 byte is received. (5) Determine (last receive - 1). (6) Read the receive data. Read RDRF bit in ICSR register (4) RDRF = 1? (9) Wait until the last byte is received. Yes Yes Last receive - 1? No Read ICDRR register (6) (5) (10) Set the STOP bit to 0. (11) Generate a stop condition. (12) Wait until a stop condition is generated. (13) Read the receive data of the last byte. (14) Set the RCVD bit to 0. ICIER register ICCR1 register ACKBT bit 1 (7) RCVD bit 1 (8) (15) Set to slave receive mode. (7) Set the ACKBT bit of the last byte and set continuous receive operation to disable (RCVD = 1). (2) (8) Read the receive data of (last byte - 1).
(1)
Dummy read in ICDRR register
No
Read ICDRR register Read RDRF bit in ICSR register
No
(9) RDRF = 1? Yes
ICSR register ICCR2 register
STOP bit 0 SCP bit 0 BBSY bit 0
(10) (11)
Read STOP bit in ICSR register
No
(12) STOP = 1? Yes
Read ICDRR register ICCR1 register ICCR1 register RCVD bit 0 MST bit 0 End
(13) (14) (15)
Notes: 1. Do not generate interrupts while processing steps (1) to (3). 2. For 1 byte of data reception, skip steps (2) to (6) after step (1) and jump to process step (7). Process step (8) is a dummy read from the ICDRR register.
Figure 25.16
Register Setting Example in Master Receive Mode (I2C bus Interface Mode) Apr 01, 2008
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R8C/32A Group
25. I2C bus Interface
Slave transmit mode ICSR register AAS bit 0 (1) Set the AAS bit to 0. (1) (2) Set the transmit data (except the last byte). Write transmit data to ICDRT register Read TDRE bit in ICSR register (2) (3) Wait until the ICRDT register is empty. (4) Set the transmit data of the last byte. (5) Wait until the last byte is transmitted. No TDRE = 1? Yes No Last byte? (4) Yes Write transmit data to ICDRT register Read TEND bit in ICSR register (3) (6) Set the TEND bit to 0. (7) Set to slave receive mode. (8) Dummy read the ICDRR register to release the SCL signal. (9) Set the TDRE bit to 0.
No
TEND = 1? Yes TEND bit 0 TRS bit 0
(5)
ICSR register ICCR1 register
(6) (7) (8) (9)
Dummy read ICDRR register ICSR register TDRE bit 0 End
Figure 25.17
Register Setting Example in Slave Transmit Mode (I2C bus Interface Mode)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
Slave receive mode ICSR register AAS bit 0 (1) (2) (3) Dummy read the ICDRR register. Dummy read ICDRR register (3) (4) Wait until 1 byte is received. (5) Determine (last receive - 1). Read RDRF bit in ICSR register (6) Read the receive data. No (4) RDRF = 1? (8) Read the receive data of (last byte - 1). Yes (9) Wait until the last byte is received. Yes Last receive - 1? No Read ICDRR register (6) (5) (10) Read the receive data of the last byte. (7) Set the ACKBT bit of the last byte. (1) (1) Set the AAS bit to 0.
(1)
ICIER register ACKBT bit 0
(2) Set the ACKBT bit to the transmit device.
ICIER register
ACKBT bit 1
(7) (8)
Read ICDRR register Read RDRF bit in ICSR register
No
(9) RDRF = 1? Yes
Read ICDRR register End
(10)
Note: 1. For 1 byte of data reception, skip steps (2) to (6) after (1) and jump to process step (7). Process step (8) is a dummy read from the ICDRR register.
Figure 25.18
Register Setting Example in Slave Receive Mode (I2C bus Interface Mode)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
25. I2C bus Interface
25.7
Noise Canceller
The states of pins SCL and SDA are routed through the noise canceller before being latched internally. Figure 25.19 shows a Noise Canceller Block Diagram. The noise canceller consists of two cascaded latch and match detector circuits. When the SCL pin input signal (or SDA pin input signal) is sampled on f1 and two latch outputs match, the level is passed forward to the next circuit. When they do not match, the former value is retained.
f1 (sampling clock)
C SCL or SDA input signal D Latch Q D
C Q Latch
Match detection circuit
Internal SCL or SDA signal
f1 period
f1 (sampling clock)
Figure 25.19
Noise Canceller Block Diagram
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R8C/32A Group
25. I2C bus Interface
25.8
Bit Synchronization Circuit
When the I2C bus interface is set to master mode, the high-level period may become shorter if: * The SCL signal is driven L level by a slave device * The rise speed of the SCL signal is reduced by a load (load capacity or pull-up resistor) on the SCL line. Therefore, the SCL signal is monitored and communication is synchronized bit by bit. Figure 25.20 shows the Bit Synchronization Circuit Timing and Table 25.5 lists the Time between Changing SCL Signal from "L" Output to High-Impedance and Monitoring SCL Signal.
Reference clock of SCL monitor timing
SCL
VIH
Internal SCL
Figure 25.20
Bit Synchronization Circuit Timing
Table 25.5
Time between Changing SCL Signal from "L" Output to High-Impedance and Monitoring SCL Signal ICCR1 Register CKS3 0 1 CKS2 0 1 0 1 SCL Monitoring Time 7.5Tcyc 19.5Tcyc 17.5Tcyc 41.5Tcyc
1Tcyc = 1/f1(s)
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R8C/32A Group
25. I2C bus Interface
25.9
Notes on I2C bus Interface
To use the I2C bus interface, set the IICSEL bit in the SSUIICSR register to 1 (I2C bus interface function selected).
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R8C/32A Group
26. Hardware LIN
26. Hardware LIN
The hardware LIN performs LIN communication in cooperation with timer RA and UART0.
26.1
Overview
The hardware LIN has the features listed below. Figure 26.1 shows a Hardware LIN Block Diagram. Master mode * Synch Break generation * Bus collision detection Slave mode * Synch Break detection * Synch Field measurement * Control function for Synch Break and Synch Field signal inputs to UART0 * Bus collision detection Note: 1.The Wake up function is detected using INT1.
Hardware LIN
RXD0 pin Synch Field control circuit TIOSEL = 0 RXD data LSTART bit SBE bit LINE bit RXD0 input control circuit TIOSEL = 1 Interrupt control circuit UART0 Bits BCIE, SBIE, and SFIE UART0 transfer clock UART0 TE bit Timer RA output pulse MST bit TXD0 pin LINE, MST, SBE, LSTART, BCIE, SBIE, SFIE: Bits in LINCR register TIOSEL: Bit in TRAIOC register TE: Bit in U0C1 register UART0 TXD data Timer RA underflow signal Timer RA interrupt Timer RA
Bus collision detection circuit
Figure 26.1
Hardware LIN Block Diagram
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R8C/32A Group
26. Hardware LIN
26.2
Input/Output Pins
The pin configuration for the hardware LIN is listed in Table 26.1. Table 26.1 Hardware LIN Pin Configuration Pin Name RXD0 TXD0 Assigned Pin P1_5 (1) P1_4 (1) Input/Output Input Output Function Receive data input pin for the hardware LIN Transmit data output pin for the hardware LIN
Name Receive data input Transmit data output
Note: 1. To use the hardware LIN, set the TXD0SEL0 bit in the U0SR register to 1 and the RXD0SEL0 bit to 1.
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R8C/32A Group
26. Hardware LIN
26.3
Registers
The hardware LIN contains the following registers: * LIN Control Register 2 (LINCR2) * LIN Control Register (LINCR) * LIN Status Register (LINST)
26.3.1
LIN Control Register 2 (LINCR2)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 BCE 0 R/W R/W R/W
Address 0105h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function BCE Bus collision detection during Sync Break transmission 0: Bus collision detection disabled enable bit 1: Bus collision detection enabled -- Reserved bits Set to 0. -- -- -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- --
--
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R8C/32A Group
26. Hardware LIN
26.3.2
LIN Control Register (LINCR)
b6 MST 0 b5 SBE 0 b4 LSTART 0 b3 RXDSF 0 b2 BCIE 0 b1 SBIE 0 b0 SFIE 0 R/W R/W
Address 0106h Bit b7 Symbol LINE After Reset 0 Bit b0
b1 b2 b3 b4
b5
b6
b7
Symbol Bit Name Function SFIE Synch Field measurement-completed 0: Synch Field measurement-completed interrupt interrupt enable bit disabled 1: Synch Field measurement-completed interrupt enabled SBIE Synch Break detection interrupt 0: Synch Break detection interrupt disabled enable bit 1: Synch Break detection interrupt enabled BCIE Bus collision detection interrupt 0: Bus collision detection interrupt disabled enable bit 1: Bus collision detection interrupt enabled RXDSF RXD0 input status flag 0: RXD0 input enabled 1: RXD0 input disabled LSTART Synch Break detection start bit (1) When this bit is set to 1, timer RA input is enabled and RXD0 input is disabled. When read, the content is 0. 0: Unmasked after Synch Break detected SBE RXD0 input unmasking timing 1: Unmasked after Synch Field measurement select bit completed (effective only in slave mode) (2) MST 0: Slave mode LIN operation mode setting bit (Synch Break detection circuit operation) 1: Master mode (timer RA output OR'ed with TXD0) LINE LIN operation start bit 0: LIN operation stops 1: LIN operation starts (3)
R/W R/W R R/W
R/W
R/W
R/W
Notes: 1. After setting the LSTART bit, confirm that the RXDSF flag is set to 1 before Synch Break input starts. 2. Before switching LIN operation modes, stop the LIN operation (LINE bit = 0) once. 3. Inputs to timer RA and UART0 are disabled immediately after the LINE bit is set to 1 (LIN operation starts). (Refer to Figure 26.3 Header Field Transmission Flowchart Example (1) and Figure 26.7 Header Field Reception Flowchart Example (2).)
26.3.3
LIN Status Register (LINST)
b6 -- 0 b5 B2CLR 0 b4 B1CLR 0 b3 B0CLR 0 b2 BCDCT 0 b1 SBDCT 0 b0 SFDCT 0 R/W R R R R/W R/W R/W --
Address 0107h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function SFDCT Synch Field measurement-completed When this bit is set to 1, Synch Field measurement flag is completed. SBDCT Synch Break detection flag when this bit is set to 1, Synch Break is detected or Synch Break generation is completed. BCDCT Bus collision detection flag When this bit is set to 1, bus collision is detected. B0CLR SFDCT bit clear bit When this bit is set to 1, the SFDCT bit is set to 0. When read, the content is 0. B1CLR SBDCT bit clear bit When this bit is set to 1, the SBDCT bit is set to 0. When read, the content is 0. B2CLR BCDCT bit clear bit When this bit is set to 1, the BCDCT bit is set to 0. When read, the content is 0. -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. --
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
26. Hardware LIN
26.4 26.4.1
Function Description Master Mode
Figure 26.2 shows an Operating Example during Header Field Transmission in master mode. Figures 26.3 and 26.4 show Examples of Header Field Transmission Flowchart. During header field transmission, the hardware LIN operates as follows: (1) When 1 is written to the TSTART bit in the TRACR register for timer RA, a "L" level is output from the TXD0 pin for the period set in registers TRAPRE and TRA for timer RA. (2) When timer RA underflows, the TXD0 pin output is inverted and the SBDCT flag in the LINST register is set to 1. If the SBIE bit in the LINCR register is set to 1, a timer RA interrupt is generated. (3) The hardware LIN transmits "55h" via UART0. (4) After the hardware LIN completes transmitting "55h", it transmits an ID field via UART0. (5) After the hardware LIN completes transmitting the ID field, it performs communication for a response field.
Synch Break
Synch Field
IDENTIFIER
TXD0 pin
1 0 1 is written to B1CLR bit in LINST register. 1 0 Set to 0 when an interrupt request is acknowledged or by a program. 1 0 (1) (2) (3) (4) (5)
SBDCT flag in LINST register IR bit in TRAIC register
The above applies when: LINE = 1, MST = 1, SBIE = 1
Figure 26.2
Operating Example during Header Field Transmission
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R8C/32A Group
26. Hardware LIN
Timer RA Set to timer mode Bits TMOD2 to TMOD0 in TRAMR register 000b Timer RA Set the pulse output level from low to start TEDGSEL bit in TRAIOC register 1 Timer RA TRAIO pin assigned to P1_5 Bits TRAIOSEL1 to TRAIOSEL0 in TRASR register 10b UART0 RXD0 pin assigned to P1_5 RXD0SEL0 bit in U0SR register 1 INT1 INT1 pin assigned to P1_5 Bits INT1SEL2 to INT1SEL0 in INTSR register 001b Timer RA Set the count source (f1, f2, f8, fOCO) Bits TCK0 to TCK2 in TRAMR register Timer RA Set the Synch Break width TRAPRE register TRA register UART0 Set to transmit/receive mode (Transfer data 8 bits long, internal clock, 1 stop bit, parity disabled) U0MR register Set the BRG count source (f1, f8, f32) Bits CLK0 and CLK1 in U0C0 register Set the bit rate U0BRG register
(1)
(1)
(1)
Set the TIOSEL bit in the TRAIOC register to 1 to select the hardware LIN function. If the wake-up function is not necessary, the setting of the INT1 pin can be omitted.
Set the count source and registers TRA and TRAPRE as appropriate for the Synch Break period.
(1)
UART0
(1)
UART0
(1)
Set the BRG count source and the U0BRG register as appropriate for the bit rate.
Hardware LIN Set the LIN operation to stop LINE bit in LINCR register 0 Hardware LIN Set to master mode. MST bit in LINCR register 1 Hardware LIN Set bus collision detection to enable BCE bit in LINCR2 register 1 Hardware LIN Set the LIN operation to start LINE bit in LINCR register 1 Hardware LIN Set interrupts to enable (Bus collision detection, Synch Break detection, Synch Field measurement) Bits BCIE, SBIE, SFIE in LINCR register
(1)
(1)
(1)
(1)
In master mode, the Synch Field measurement-completed interrupt cannot be used.
Hardware LIN Clear the status flags (Bus collision detection, Synch Break detection, Synch Field measurement) Bits B2CLR, B1CLR, B0CLR in LINST register 1
A
Note: 1. When the previous communication completes normally and header field transmission is performed again with the same settings, the above settings can be omitted.
Figure 26.3
Header Field Transmission Flowchart Example (1) Apr 01, 2008
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R8C/32A Group
26. Hardware LIN
A
Timer RA Set the timer to start counting TSTART bit in TRACR register 1 Read the count status flag TCSTF flag in TRACR register NO A Synch Break for timer RA is generated. After writing 1 to the TSTART bit, if registers TRAPRE and TRA for timer RA are not read or the register settings are not changed, reading 1 from the TCSTF flag can be omitted. Zero or one cycle of the timer RA count source is required after timer RA starts counting before the TCSTF flag is set to 1. A timer RA interrupt can be used to end Synch Break generation. One or two cycles of the CPU clock are required after Synch Break generation ends before the SBDCT flag is set to 1. After a Synch Break for timer RA is generated, stop the timer count. After writing 0 to the TSTART bit, if registers TRAPRE and TRA for timer RA are not read or the register settings are not changed, reading 0 from the TCSTF flag can be omitted. Zero or one cycle of the timer RA count source is required after timer RA stops counting before the TCSTF flag is set to 0. The Synch Field is transmitted.
Timer RA
TCSTF = 1? YES
Hardware LIN Read the Synch Break detection flag SBDCT flag in LINST register NO
SBDCT = 1? YES Timer RA
Set the timer to stop counting TSTART bit in TRACR register 0 Read the count status flag TCSTF flag in TRACR register NO
Timer RA
TCSTF = 0? YES UART0 Communication via UART0 TE bit in U0C1 register 1 U0TB register 0055h
UART0 Communication via UART0 U0TB register ID field
The ID field is transmitted.
Figure 26.4
Header Field Transmission Flowchart Example (2)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
26. Hardware LIN
26.4.2
Slave Mode
Figure 26.5 shows an Operating Example during Header Field Reception in slave mode. Figure 26.6 through Figure 26.8 show examples of Header Field Reception Flowchart. During header field reception, the hardware LIN operates as follows: (1) When 1 is written to the LSTART bit in the LINCR register for the hardware LIN, Synch Break detection is enabled. (2) If a "L" level is input for a duration equal to or longer than the period set in timer RA, the hardware LIN detected it as a Synch Break. At this time, the SBDCT flag in the LINST register is set to 1. If the SBIE bit in the LINCR register is set to 1, a timer RA interrupt is generated. Then the hardware LIN enters the Synch Field measurement. (3) The hardware LINA receives a Synch Field (55h) and measures the period of the start bit and bits 0 to 6 is using timer RA. At this time, whether to input the Synch Field signal to RXD0 of UART0 can be selected by the SBE bit in the LINCR register. (4) When the Synch Field measurement is completed, the SFDCT flag in the LINST register is set to 1. If the SFIE bit in the LINCR register is set to 1, a timer RA interrupt is generated. (5) After the Synch Field measurement is completed, a transfer rate is calculated from the timer RA count value. The rate is set in UART0 and registers TRAPRE and TRA for timer RA are set again. Then the hardware LIN receives an ID field via UART0. (6) After the hardware LIN completes receiving the ID field, it performs communication for a response field.
Synch Break
Synch Field
IDENTIFIER
RXD0 pin
1 0 1 0 1 0 1 0 1 0 1 0 (1) (2) (3) (4) (5) (6) 1 is written to B1CLR bit in LINST register. This period is measured.
RXD0 input for UART0 RXDSF flag in LINCR register SBDCT flag in LINST register SFDCT flag in LINST register IR bit in TRAIC register
1 is written to LSTART bit in LINCR register.
The flag is set to 0 after Synch Field measurement is completed.
1 is written to B0CLR bit in LINST register.
Set to 0 when an interrupt request is acknowledged or by a program.
The above applies when: LINE = 1, MST = 0, SBE = 1, SBIE = 1, SFIE = 1
Figure 26.5
Operating Example during Header Field Reception
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Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
26. Hardware LIN
Timer RA
Set to pulse width measurement mode Bits TMOD2 to TMOD0 in TRAMR register 011b Set the pulse width measurement level to low TEDGSEL bit in TRAIOC register 0 TRAIO pin assigned to P1_5 Bits TRAIOSEL1 to TRAIOSEL0 in TRASR register 10b RXD0 pin assigned to P1_5 RXD0SEL0 bit in U0SR register 1 INT1 pin assigned to P1_5 Bits INT1SEL2 to INT1SEL0 in INTSR register 001b Set the count source (f1, f2, f8, fOCO) Bits TCK0 to TCK2 in TRAMR register Set the Synch Break width TRAPRE register TRA register Set the LIN operation to stop LINE bit in LINCR register 0 Set to slave mode MST bit in LINCR register 0 Set the LIN operation to start LINE bit in LINCR register 1 Set the RXD0 input unmasking timing (After Synch Break detection, or after Synch Field measurement) SBE bit in LINCR register
(1)
Timer RA
(1)
Timer RA UART0 INT1
(1)
Set the TIOSEL bit in the TRAIOC register to 1 to select the hardware LIN function. If the wake-up function is not necessary, the setting of the INT1 pin can be omitted.
Timer RA
(1)
Timer RA
(1)
Set the count source and registers TRA and TRAPRE as appropriate for the Synch Break period.
Hardware LIN
(1)
Hardware LIN
(1)
Hardware LIN
Hardware LIN
(1)
Select the timing at which to unmask the RXD0 input for UART0. If the RXD0 input is chosen to be unmasked after Synch Break detection, the Synch Field signal is also input to UART0.
Hardware LIN
Set interrupts to enable (Bus collision detection, Synch Break detection, Synch Field measurement) Bits BCIE, SBIE, SFIE in LINCR register
(1)
A
Note: 1. When the previous communication completes normally and header field reception is performed again with the same settings, the above settings can be omitted.
Figure 26.6
Header Field Reception Flowchart Example (1)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
26. Hardware LIN
A
Hardware LIN Clear the status flags (Bus collision detection, Synch Break detection, Synch Field measurement) Bits B2CLR, B1CLR, B0CLR in LINST register 1 Timer RA Set pulse width measurement to start TSTART bit in TRACR register 1 Read the count status flag TCSTF flag in TRACR register NO Zero or one cycle of the timer RA count source is required after timer RA starts counting before the TCSTF flag is set to 1. Wait until the RXD0 input to UART0 for the hardware LIN is masked. After writing 1 to the LSTART bit, do not apply a "L" level to the RXD pin until 1 is read from the RXDSF flag. Otherwise, the signal applied during this time will be input directly to UART0. One or two cycles of the CPU clock and zero or one cycle of the timer RA count source are required after the LSTART bit is set to 1 before the RXDSF flag is set to 1. After this, input to timer RA and UART0 is enabled. A Synch Break for the hardware LIN is detected. A timer RA interrupt can be used. When a Synch Break is detected, timer RA is reloaded with the initially set count value. Even if the duration of the input "L" level is shorter than the set period, timer RA is reloaded with the initially set count value. Wait until the next "L" level is input. One or two cycles of the CPU clock are required after Synch Break detection before the SBDCT flag is set to 1. If the SBE bit in the LINCR register is set to 0 (unmasked after Synch Break detected), timer RA can be used in timer mode after the SBDCT flag in the LINST register is set to 1 and the RXDSF flag is set to 0. Wait until timer RA starts counting.
Timer RA
TCSTF = 1? YES
Hardware LIN Set Synch Break detection to start LSTART bit in LINCR register 1 Hardware LIN Read the RXD0 input status flag RXDSF flag in LINCR register NO
RXDSF = 1? YES
Hardware LIN Read the Synch Break detection flag SBDCT flag in LINST register NO
SBDCT = 1? YES
B
Figure 26.7
Header Field Reception Flowchart Example (2)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
26. Hardware LIN
B
YES Hardware LIN Read the Synch Field measurementcompleted flag SFDCT flag in LINST register NO
SFDCT = 1? YES UART0
A Synch Field for the hardware LIN is measured. A timer RA interrupt can be used. (The SBDCT flag is set when the timer RA counter underflows.) If the SBE bit in the LINCR register is set to 1 (unmasked after Synch Field measurement completed), timer RA can be used in timer mode after the SFDCT flag in the LINST register is set to 1 and the RXDSF flag is set to 0.
Set the UART0 communication rate U0BRG register
Timer RA Set the Synch Break width again TRAPRE register TRA register UART0 Communication via UART0 Clock asynchronous serial interface (UART) mode ID field reception
Set a communication rate based on the Synch Field measurement result.
Communication is performed via UART0. (The SBDCT flag is set when the timer RA counter underflows.)
Figure 26.8
Header Field Reception Flowchart Example (3)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
26. Hardware LIN
26.4.3
Bus Collision Detection Function
The bus collision detection function can be used if UART0 is enabled for transmission (TE bit in U0C1 register = 1). To detect a bus collision during Synch Break transmission, set the BCE bit in the LINCR2 register to 1 (bus collision detection enabled). Figure 26.9 shows an Operating Example When Bus Collision is Detected.
TXD0 pin
1 0 1 0 1 0 Set to 1 by a program. 1 0 Set to 1 by a program. 1 0 1 is written to B2CLR bit in LINST register. 1 0 1 0 Set to 0 when an interrupt request is acknowledged or by a program.
RXD0 pin
Transfer clock
LINE bit in LINCR register TE bit in U0C1 register BCDCT flag in LINST register IR bit in TRAIC register
Figure 26.9
Operating Example When Bus Collision is Detected
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
26. Hardware LIN
26.4.4
Hardware LIN End Processing
Figure 26.10 shows an Example of Hardware LIN Communication Completion Flowchart. Use the following timing for hardware LIN end processing: * If the hardware bus collision detection function is used Perform hardware LIN end processing after checksum transmission completes. * If the bus collision detection function is not used Perform hardware LIN end processing after header field transmission and reception complete.
Timer RA
Set the timer to stop counting TSTART bit in TRACR register 0 Read the count status flag TCSTF flag in TRACR register NO
Set the timer to stop counting. Zero or one cycle of the timer RA count source is required after timer RA stops counting before the TCSTF flag is set to 1.
Timer RA
TCSTF = 0? YES UART0
Transmission completes via UART0
If the bus collision detection function is not used, UART0 transmission completion processing is not required.
Hardware LIN Clear the status flags (Bus collision detection, Synch Break detection, Synch Field measurement) Bits B2CLR, B1CLR, B0CLR in LINST register 1 Hardware LIN Set the LIN operation to stop LINE bit in LINCR register 0
After clearing the hardware LIN status flag, stop the hardware LIN operation.
Figure 26.10
Example of Hardware LIN Communication Completion Flowchart
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
26. Hardware LIN
26.5
Interrupt Requests
There are four interrupt requests generated by the hardware LIN: Synch Break detection, Completion of Synch Break generation, Completion of Synch Field measurement, and bus collision detection. These interrupts are shared with timer RA. Table 26.2 lists the Hardware LIN Interrupt Requests. Table 26.2 Hardware LIN Interrupt Requests Status Flag SBDCT Interrupt Source Generated when timer RA underflows after the "L" level duration for the RXD0 input is measured, or when a "L" level is input for a duration longer than the Synch Break period during communication. Generated when a "L" level output to TXD0 for the duration set by timer RA is completed. SFDCT BCDCT Generated when measurement for 6 bits of the Lynch Field by timer RA is completed. Generated when the RXD0 input and TXD0 output values are different at data latch timing while UART0 is enabled for transmission.
Interrupt Request Synch Break detection
Completion of Synch Break generation Completion of Synch Field measurement Bus collision detection
REJ09B0458-0010 Rev.0.10 Page 430 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
26. Hardware LIN
26.6
Notes on Hardware LIN
For the time-out processing of the header and response fields, use another timer to measure the duration of time with a Synch Break detection interrupt as the starting point.
REJ09B0458-0010 Rev.0.10 Page 431 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27. A/D Converter
The A/D converter consists of one 10-bit successive approximation A/D converter circuit with a capacitive coupling amplifier. The analog input shares pins and P1_0 to P1_3.
27.1
Overview
Table 27.1 lists the A/D Converter Performance. Figure 27.1 shows a Block Diagram of A/D Converter. Table 27.1 A/D Converter Performance Performance Successive approximation (with capacitive coupling amplifier) 0 V to AVCC fAD, fAD divided by 2, fAD divided by 4, fAD divided by 8 (fAD=f1 or fOCO-F) 8 bits or 10 bits selectable AVCC = Vref = 5 V, AD = 20 MHz * 8-bit resolution 2 LSB * 10-bit resolution 3 LSB AVCC = Vref = 3.3 V, AD = 16 MHz * 8-bit resolution 2 LSB * 10-bit resolution 5 LSB AVCC = Vref = 3.0 V, AD = 10 MHz * 8-bit resolution 2 LSB * 10-bit resolution 5 LSB AVCC = Vref = 2.2 V, AD = 5 MHz * 8-bit resolution 2 LSB * 10-bit resolution 5 LSB One-shot mode, repeat mode 0, repeat mode 1, single sweep mode, and repeat sweep mode 4 pins (AN8 to AN11) * Software trigger * Timer RC * External trigger (Refer to 27.3.3 A/D Conversion Start Condition.) Minimum 43 AD cycles
Item A/D conversion method Analog input voltage (1) Operating clock AD (2) Resolution Absolute accuracy
Operating mode Analog input pin A/D conversion start condition
Conversion rate per pin (AD = fAD) (3)
Notes: 1. When the analog input voltage is over the reference voltage, the A/D conversion result will be 3FFh in 10-bit mode and FFh in 8-bit mode. 2. When 4.0 V AVCC 5.5 V, the frequency of AD must be 20 MHz or below. When 3.2 V AVCC < 4.0 V, the frequency of AD must be 16 MHz or below. When 3.0 V AVCC < 3.2 V, the frequency of AD must be 10 MHz or below. When 2.2 V AVCC < 3.0 V, the frequency of AD must be 5 MHz or below. The AD frequency should be 2 MHz or above. 3. The conversion rate per pin is minimum 43 AD cycles for 8-bit and 10-bit resolution.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
CKS2 = 1
fOCO-F f1
CKS2 = 0
fAD
1/2
1/2
1/2
CKS1 to CKS0 = 00b = 01b = 10b = 11b
AD
VREF AVSS Software trigger Do not set. Timer RC trigger ADTRG
ADSTBY = 0 ADSTBY = 1 ADCAP1 to ADCAP0 = 00b = 01b = 10b = 11b
Analog circuit
Trigger
Successive conversion register
SCAN1 to SCAN0 CH2 to CH0
AD0 register AD1 register AD2 register AD3 register AD4 register AD5 register AD6 register AD7 register
ADGSEL1 to ADGSEL0 Vin Vref
Decoder Comparator
Data bus
CH2 to CH0 = 100b CH2 to CH0 = 101b CH2 to CH0 = 110b CH2 to CH0 = 111b
P1_0/AN8 P1_1/AN9 P1_2/AN10 P1_3/AN11
ADGSEL1 to ADGSEL0 = 01b = 11b
ADEX0 = 0 OCVREFAN = 0 On-chip reference voltage (OCVREF) OCVREFAN = 1 (Note 1) ADEX0 = 1
ADDDAEN=0
ADDDAEL
ADDDAEN=1
CKS0 to CKS2, ADCAP0 to ADCAP1: Bits in ADMOD register CH0 to CH2, SCAN0 to SCAN1, ADGSEL0 to ADGSEL1: Bits in ADINSEL register ADEX0, ADSTBY, ADDDAEN, ADDDAEL: Bits in ADCON1 register OCVREFAN: Bit in OCVREFCR register Note: 1. When on-chip reference voltage is used as analog input, first set the ADEX0 bit to 1 (on-chip reference voltage selected) and then set the OCVREFAN bit to 1 (on-chip reference voltage and analog input are connected). When on-chip reference voltage is not used as analog input, first set the OCVREFAN bit to 0 (on-chip reference voltage and analog input are cut off) and then set the ADEX0 bit to 0 (extended analog input pin not selected).
Figure 27.1
Block Diagram of A/D Converter
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.2 27.2.1
Registers On-Chip Reference Voltage Control Register (OCVREFCR)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 OCVREFAN 0
Address 0026h Bit b7 Symbol -- After Reset 0 Bit b0
b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function R/W OCVREFAN On-chip reference voltage to 0: On-chip reference voltage and analog input are cut off R/W 1: On-chip reference voltage and analog input are analog input connect bit (1) connected -- Set to 0. R/W Reserved bits -- -- -- -- -- --
Note: 1. When on-chip reference voltage is used as analog input, first set the ADEX0 bit in the ADCON1 register to 1 (onchip reference voltage selected) and then set the OCVREFAN bit to 1 (on-chip reference voltage and analog input are connected). When on-chip reference voltage is not used as analog input, first set the OCVREFAN bit to 0 (on-chip reference voltage and analog input are cut off) and then set the ADEX0 bit to 0 (extended analog input pin not selected).
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the OCVREFCR register. If the contents of the OCVREFCR register are rewritten during A/D conversion, the conversion result is undefined.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.2.2
A/D Register i (ADi) (i = 0 to 7)
Address 00C1h to 00C0h (AD0), 00C3h to 00C2h (AD1), 00C5h to 00C4h (AD2), 00C7h to 00C6h (AD3), 00C9h to 00C8h (AD4), 00CBh to 00CAh (AD5), 00CDh to 00CCh (AD6), 00CFh to 00CEh (AD7) Bit b7 b6 b5 b4 b3 b2 b1 Symbol -- -- -- -- -- -- -- After Reset X X X X X X X Bit Symbol After Reset b15 -- 0 b14 -- 0 b13 -- 0 b12 -- 0 b11 -- 0 b10 -- 0 b9 -- X
b0 -- X b8 -- X
Bit b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15
10-Bit Mode (BITS Bit in ADCON1 Register = 1) 8 low-order bits in A/D conversion result
Function 8-Bit Mode (BITS Bit in ADCON1 Register = 0) A/D conversion result
R/W R
2 high-order bits in A/D conversion result
When read, the content is 0.
R --
Nothing is assigned. If necessary, set to 0. When read, the content is 0.
Reserved bit
When read, the content is undefined.
R
If the contents of the ADCON1, ADMOD, ADINSEL, or OCVREFCR register are written during A/D conversion, the conversion result is undefined. When using the A/D converter in 10-bit mode, repeat mode 0, repeat mode 1, or repeat sweep mode, access the ADi register in 16-bit units. Do not access it in 8-bit units.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.2.3
A/D Mode Register (ADMOD)
b5 MD2 0 b4 MD1 0 b3 MD0 0 b2 CKS2 0 b1 CKS1 0 b0 CKS0 0 R/W R/W R/W
Address 00D4h Bit b7 b6 Symbol ADCAP1 ADCAP0 After Reset 0 0 Bit b0 b1
Symbol Bit Name CKS0 Division select bit CKS1
Function
b1 b0
b2 b3 b4 b5
CKS2 MD0 MD1 MD2
Clock source select bit (1) A/D operating mode select bit
0 0: fAD divided by 8 0 1: fAD divided by 4 1 0: fAD divided by 2 1 1: fAD divided by 1 (no division) 0: Selects f1 1: Selects fOCO-F
b5 b4 b3
R/W R/W R/W R/W
0 0 0: One-shot mode 0 0 1: Do not set. 0 1 0: Repeat mode 0 0 1 1: Repeat mode 1 1 0 0: Single sweep mode 1 0 1: Do not set. 1 1 0: Repeat sweep mode 1 1 1: Do not set.
b7 b6
b6 b7
ADCAP0 A/D conversion trigger select ADCAP1 bit
0 0: A/D conversion starts by software trigger (ADST bit in ADCON0 register) 0 1: Do not set. 1 0: A/D conversion starts by conversion trigger from timer RC 1 1: A/D conversion starts by external trigger (ADTRG)
R/W R/W
Note: 1. When the CKS2 bit is changed, wait for 3 AD cycles or more before starting A/D conversion.
If the ADMOD register is rewritten during A/D conversion, the conversion result is undefined.
REJ09B0458-0010 Rev.0.10 Page 436 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.2.4
A/D Input Select Register (ADINSEL)
b5 -- 0 b4 SCAN0 0 b3 -- 0 b2 CH2 0 b1 CH1 0 b0 CH0 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 00D5h Bit b7 b6 Symbol ADGSEL1 ADGSEL0 After Reset 1 1 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name CH0 Analog input pin select bit CH1 CH2 -- Reserved bit SCAN0 A/D sweep pin count select bit -- Reserved bit ADGSEL0 A/D input group select bit ADGSEL1
Function Refer to Table 27.2 Analog Input Pin Selection
Set to 0. 0: 2 pins 1: 4 pins Set to 0.
b7 b6
0 0: Do not set. 0 1: Port P1 group selected 1 0: Do not set. 1 1: Port group not selected
If the ADINSEL register is rewritten during A/D conversion, the conversion result is undefined. Table 27.2 Analog Input Pin Selection Bits ADGSEL1, ADGSEL0 = 01b AN8 AN9 AN10 AN11 Do not set.
Bits CH2 to CH0 000b 001b 010b 011b 100b 101b 110b 111b
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.2.5
A/D Control Register 0 (ADCON0)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 ADST 0 R/W R/W --
Address 00D6h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name ADST A/D conversion start flag -- -- -- -- -- -- --
Function 0: Stop A/D conversion 1: Start A/D conversion Nothing is assigned. If necessary, set to 0. When read, the content is 0.
ADST Bit (A/D conversion start flag)
[Conditions for setting to 1] When A/D conversion starts and while A/D conversion is in progress. [Condition for setting to 0] When A/D conversion stops.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.2.6
A/D Control Register 1 (ADCON1)
b4 BITS 0 b3 -- 0 b2 -- 0 b1 -- 0 b0 ADEX0 0 R/W R/W R/W
Address 00D7h Bit b7 b6 b5 Symbol ADDDAEL ADDDAEN ADSTBY After Reset 0 0 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol ADEX0 -- -- -- BITS
Bit Name Function Extended analog input pin select bit (1) 0: Extended analog input pin not selected 1: On-chip reference voltage selected (2) Reserved bits Set to 0.
8/10-bit mode select bit
ADSTBY A/D standby bit (3) ADDDAEN A/D open-circuit detection assist function enable bit (4) ADDDAEL A/D open-circuit detection assist method select bit (4)
0: 8-bit mode 1: 10-bit mode 0: A/D operation stops (standby) 1: A/D operation enabled 0: Disabled 1: Enabled 0: Discharge before conversion 1: Precharge before conversion
R/W R/W R/W R/W
Notes: 1. When on-chip reference voltage is used as analog input, first set the ADEX0 bit to 1 (on-chip reference voltage selected) and then set the OCVREFAN bit in the OCVREFCR register to 1 (on-chip reference voltage and analog input are connected). When on-chip reference voltage is not used as analog input, first set the OCVREFAN bit to 0 (on-chip reference voltage and analog input are cut off) and then set the ADEX0 bit to 0 (extended analog input pin not selected). 2. Do not set to 1 (A/D conversion using comparison reference voltage as input) in single sweep mode or repeat sweep mode. 3. When the ADSTBY bit is changed from 0 (A/D operation stops) to 1 (A/D operation enabled), wait for 1 AD cycle or more before starting A/D conversion. 4. To enable the A/D open-circuit detection assist function, select the conversion start state with the ADDDAEL bit after setting the ADDDAEN bit to 1 (enabled). The conversion result with an open circuit varies with external circuits. Careful evaluation should be performed according to the system before using this function.
If the ADCON1 register is rewritten during A/D conversion, the conversion result is undefined.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.3 27.3.1
Common Items for Multiple Modes Input/Output Pins
The analog input shares pins P1_0 to P1_3 in AN8 to AN11. When using the ANi (i = 8 to 11) pin as input, set the corresponding port direction bit to 0 (input mode). After changing the A/D operating mode, select an analog input pin again.
27.3.2
A/D Conversion Cycles
Figure 27.2 shows a Timing Diagram of A/D Conversion. Figure 27.3 shows the A/D Conversion Cycles (AD = fAD).
A/D conversion execution time
Open-circuit detection
Open-circuit detection Charging time
Start process
Conversion time of 1st bit
2nd bit
End process
Start process
Sampling time 15 AD cycles
Comparison time
Comparison Comparison time time
* Repeat until conversion ends
......
Comparison End process time
Figure 27.2
Timing Diagram of A/D Conversion
A/D conversion execution time
Conversion time at the 2nd bit and the follows
Start process
Open-circuit detection
Conversion time at the 1st bit
End process
Conversion time (Minimum) (1) 43 AD
Start process (Minimum)
1 AD
Open-circuit detection Charging time
Sampling time
Comparison time
Comparison time
End process
Disabled: 0 AD
Enabled: 2 AD
15 AD
2.5 AD
2.5 AD
2 AD
Note: 1. The conversion time (minimum) is 43 AD for 8-bit and 10-bit resolution.
Figure 27.3
A/D Conversion Cycles (AD = fAD)
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
Table 27.3 shows the Number of Cycles for A/D Conversion Items. The A/D conversion time is defined as follows. The start process time varies depending on which AD is selected. When 1 (A/D conversion starts) is written to the ADST bit in the ADCON0 register, an A/D conversion starts after the start process time has elapsed. Reading the ADST bit before the A/D conversion returns 0 (A/D conversion stops). In the modes where an A/D conversion is performed on multiple pins or multiple times, the between-execution process time is inserted between the A/D conversion execution time for one pin and the next A/D conversion time. In one-shot mode and single sweep mode, the ADST bit is set to 0 during the end process time and the last A/D conversion result is stored in the ADi register.
* In on-shot mode
Start process time + A/D conversion execution time + end process time
* When two pins are selected in single sweep mode
Start process time + (A/D conversion execution time + between-execution process time + A/D conversion execution time) + end process time Table 27.3 Number of Cycles for A/D Conversion Items Number of Cycles 1 or 2 fAD cycles 2 or 3 fAD cycles 3 or 4 fAD cycles 5 or 6 fAD cycles 40 AD cycles 42 AD cycles 1 AD cycle 2 or 3 fAD cycles
A/D Conversion Item AD = fAD AD = fAD divided by 2 AD = fAD divided by 4 AD = fAD divided by 8 A/D conversion Open-circuit detection disabled execution time Open-circuit detection enabled Between-execution process time End process time Start process time
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.3.3
A/D Conversion Start Condition
A software trigger, trigger from timer RC, and external trigger are used as A/D conversion start triggers. Figure 27.4 shows the Block Diagram of A/D Conversion Start Control Unit.
ADCAP1 to ADCAP0 (1)
= 00b
IMFj (TRCSR register) ADTRG pin PD4_5
ADST ADTRGjE INT0EN
= 10b = 11b
A/D conversion start trigger
j = A, B, C, D k = 0 to 1 ADCAP1 to ADCAP0: Bits in ADMOD register ADST: Bit in ADCON0 register ADTRGjE: Bit in TRCADCR register INT0EN: Bit in INTEN register IMFj: Bit in TRCSR register PD4_5: Bit in PD4 register Note: 1. Do not set bits ADCAP1 to ADCAP0 to 01b.
Figure 27.4
Block Diagram of A/D Conversion Start Control Unit
27.3.3.1
Software Trigger
A software trigger is selected when bits ADCAP1 to ADCAP0 in the ADMOD register are set to 00b (software trigger). The A/D conversion starts when the ADST bit in the ADCON0 register is set to 1 (A/D conversion starts).
27.3.3.2
Trigger from Timer RC
This trigger is selected when bits ADCAP1 to ADCAP0 in the ADMOD register are set to 10b (timer RC). To use this function, make sure the following conditions are met.
* Bits ADCAP1 to ADCAP0 in the ADMOD register are set to 10b (timer RC). * Timer RC is used in the output compare function (timer mode, PWM mode, PWM2 mode). * The ADTRGjE bit (j = A, B, C, D) in the TRCADCR register is set to 1 (A/D trigger occurs at compare match
with TRCGRj register). * The ADST bit in the ADCON0 register is set to 1 (A/D conversion starts). When the IMFj bit in the TRCSR register is changed from 0 to 1, A/D conversion starts. Refer to 19. Timer RC, 19.5 Timer Mode (Output Compare Function), 19.6 PWM Mode, 19.7 PWM2 Mode for the details of timer RC and the output compare function (timer mode, PWM mode, and PWM2 mode).
27.3.3.3
External Trigger
This trigger is selected when bits ADCAP1 to ADCAP0 in the ADMOD register are set to 11b (external trigger (ADTRG)). To use this function, make sure the following conditions are met.
* Bits ADCAP1 to ADCAP0 in the ADMOD register are set to 11b (external trigger (ADTRG)). * The INT0EN bit in the INTEN register is set to 1 ((INT0 input enabled)). * The PD4_5 bit in the PD4 register is set to 0 (input mode). * The ADST bit in the ADCON0 register is set to 1 (A/D conversion starts).
When the ADTRG pin input is changed from "H" to "L" under the above conditions, A/D conversion starts. REJ09B0458-0010 Rev.0.10 Page 442 of 572 Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.3.4
A/D Conversion Result
The A/D conversion result is stored in the ADi register (i = 0 to 7). The register where the result is stored varies depending on the A/D operating mode used. The contents of the ADi register are undefined after a reset. Values cannot be written to the ADi register. In repeat mode 0, no interrupt request is generated. After the first AD conversion is completed, determine if the A/D conversion time has elapsed by a program. In one-shot mode, repeat mode 1, single sweep mode, and repeat sweep mode, an interrupt request is generated at certain times, such as when an A/D conversion completes (the IR bit in the ADIC register is set to 1). However, in repeat mode 1 and repeat sweep mode, A/D conversion continues after an interrupt request is generated. Read the ADi register before the next A/D conversion is completed, since at completion the ADi register is rewritten with the new value. In one-shot mode and single sweep mode, when bits ADCAP1 to ADCAP0 in the ADMOD register is set to 00b (software trigger), the ADST bit in the ADCON0 register is used to determine whether the A/D conversion or sweep has completed. During an A/D conversion operation, if the ADST bit in the ADCON0 register is set to 0 (A/D conversion stops) by a program to forcibly terminate A/D conversion, the conversion result of the A/D converter is undefined and no interrupt is generated. If the ADST bit is set to 0 by a program, do not use the value of the ADi register.
27.3.5
Low Current Consumption Function
When the A/D converter is not used, power consumption can be reduced by setting the ADSTBY bit in the ADCON1 register to 0 (A/D operation stops (standby)) to shut off any analog circuit current flow. To use the A/D converter, set the ADSTBY bit to 1 (A/D operation enabled) and wait for 1 AD cycle or more before setting the ADST bit in the ADCON0 register to 1 (A/D conversion starts). Do not write 1 to bits ADST and ADSTBY at the same time. Also, do not set the ADSTBY bit to 0 (A/D operation stops (standby)) during A/D conversion.
27.3.6
Extended Analog Input Pins
In one-shot mode, repeat mode 0, and repeat mode 1, the on-chip reference voltage (OCVREF) can be used as analog input. Any variation in VREF can be confirmed using the on-chip reference voltage. Use the ADEX0 bit in the ADCON1 register and the OCVREFAN bit in the OCVREFCR register to select the on-chip reference voltage. The A/D conversion result of the on-chip reference voltage in one-shot mode or in repeat mode 0 is stored in the AD0 register.
27.3.7
A/D Open-Circuit Detection Assist Function
To suppress influences of the analog input voltage leakage from the previously converted channel during A/D conversion operation, a function is incorporated to fix the electric charge on the chopper amp capacitor to the predetermined state (AVCC or GND) before starting conversion. This function enables more reliable detection of an open circuit in the wiring connected to the analog input pins. Figure 27.5 shows the A/D Open-Circuit Detection Example on AVCC Side (Precharge before Conversion Selected) and Figure 27.6 shows the A/D Open-Circuit Detection Example on AVSS Side (Discharge before Conversion Selected).
REJ09B0458-0010 Rev.0.10 Page 443 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
ON External circuit example (1) ADDDAEN R Precharge OFF
Precharge control signal
Discharge control signal
Analog input ANi i = 8 to 11 Chopper amp capacitor
Open
C
Note: 1. The conversion result for an open circuit varies with external circuits. Careful evaluation should be performed before using this function.
Figure 27.5
A/D Open-Circuit Detection Example on AVCC Side (Precharge before Conversion Selected)
OFF
Precharge control signal
External circuit example (1) Analog input ANi i = 8 to 11 Open R C
ADDDAEN
ON
Discharge control signal
Discharge Chopper amp capacitor
Note: 1. The conversion result for an open circuit varies with external circuits. Careful evaluation should be performed before using this function.
Figure 27.6
A/D Open-Circuit Detection Example on AVSS Side (Discharge before Conversion Selected)
REJ09B0458-0010 Rev.0.10 Page 444 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.4
One-Shot Mode
In one-shot mode, the input voltage to one pin selected from among AN8 to AN11 or OCVREF is A/D converted once. Table 27.4 lists the One-Shot Mode Specifications. Table 27.4 Function One-Shot Mode Specifications Item Specification The input voltage to the pin selected by bits CH2 to CH0 and bits ADGSEL1 to ADGSEL0 in the ADINSEL register or the ADEX0 bit in the ADCON1 register is A/D converted once. 8 bits or 10 bits * Software trigger * Timer RC * External trigger (Refer to 27.3.3 A/D Conversion Start Condition) * A/D conversion completes (If bits ADCAP1 to ADCAP0 in the ADMOD register are set to 00b (software trigger), the ADST bit in the ADCON0 register is set to 0.) * Set the ADST bit to 0 When A/D conversion completes One pin selectable from among AN8 to AN11, or OCVREF. AD0 register: AN8, OCVREF AD1 register: AN9 AD2 register: AN10 AD3 register: AN11 Read register AD0 to AD3 corresponding to the selected pin.
Resolution A/D conversion start condition
A/D conversion stop condition
Interrupt request generation timing Analog input pin Storage resister for A/D conversion result
Reading of result of A/D converter
REJ09B0458-0010 Rev.0.10 Page 445 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.5
Repeat Mode 0
In repeat mode 0, the input voltage to one pin selected from among AN8 to AN11 or OCVREF is A/D converted repeatedly. Table 27.5 lists the Repeat Mode 0 Specifications. Table 27.5 Function Repeat Mode 0 Specifications Item Specification The input voltage to the pin selected by bits CH2 to CH0 and bits ADGSEL1 to ADGSEL0 in the ADINSEL register or the ADEX0 bit in the ADCON1 register is A/D converted repeatedly. 8 bits or 10 bits * Software trigger * Timer RC * External trigger (Refer to 27.3.3 A/D Conversion Start Condition) Set the ADST bit in the ADCON0 register to 0 Not generated One pin selectable from among AN8 to AN11, or OCVREF. AD0 register: AN8, OCVREF AD1 register: AN9 AD2 register: AN10 AD3 register: AN11 Read register AD0 to AD3 corresponding to the selected pin.
Resolution A/D conversion start condition
A/D conversion stop condition Interrupt request generation timing Analog input pin Storage resister for A/D conversion result
Reading of result of A/D converter
REJ09B0458-0010 Rev.0.10 Page 446 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.6
Repeat Mode 1
In repeat mode 1, the input voltage to one pin selected from among AN8 to AN11 or OCVREF is A/D converted repeatedly. Table 27.6 lists the Repeat Mode 1 Specifications. Figure 27.7 shows the Operating Example of Repeat Mode 1. Table 27.6 Repeat Mode 1 Specifications Item
Specification Function The input voltage to the pin selected by bits CH2 to CH0 and bits ADGSEL1 to ADGSEL0 in the ADINSEL register or the ADEX0 bit in the ADCON1 register is A/D converted repeatedly. Resolution 8 bits or 10 bits A/D conversion start condition * Software trigger * Timer RC * External trigger (Refer to 27.3.3 A/D Conversion Start Condition) A/D conversion stop condition Set the ADST bit in the ADCON0 register to 0 Interrupt request generation When the A/D conversion result is stored in the AD7 register. timing Analog input pin One pin selectable from among AN8 to AN11, or OCVREF. Storage resister for A/D AD0 register: 1st A/D conversion result, 9th A/D conversion result... conversion result AD1 register: 2nd A/D conversion result, 10th A/D conversion result... AD2 register: 3rd A/D conversion result, 11th A/D conversion result... AD3 register: 4th A/D conversion result, 12th A/D conversion result... AD4 register: 5th A/D conversion result, 13th A/D conversion result... AD5 register: 6th A/D conversion result, 14th A/D conversion result... AD6 register: 7th A/D conversion result, 15th A/D conversion result... AD7 register: 8th A/D conversion result, 16th A/D conversion result... Reading of result of A/D Read registers AD0 to AD7 converter
REJ09B0458-0010 Rev.0.10 Page 447 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
ADST bit in ADCON0 register
"1" "0"
Successive conversion register
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
AD0 register
Undefined
1st A/D conversion result
9th A/D conversion result
AD1 register
Undefined
2nd A/D conversion result
AD2 register
Undefined
3rd A/D conversion result
AD3 register
Undefined
4th A/D conversion result
AD4 register
Undefined
5th A/D conversion result
AD5 register
Undefined
6th A/D conversion result
AD6 register
Undefined
7th A/D conversion result
AD7 register
Undefined
8th A/D conversion result
Set to 0 when interrupt request is acknowledged, or set by a program.
IR bit in ADIC register
"1" "0"
The above applies under the following conditions: Bits ADCAP1 to ADCAP0 in the ADMOD register are set to 00b (starts by software trigger).
Figure 27.7
Operating Example of Repeat Mode 1
REJ09B0458-0010 Rev.0.10 Page 448 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.7
Single Sweep Mode
In single sweep mode, the input voltage to two or four pins selected from among AN8 to AN11 are A/D converted once. Table 27.7 lists the Single Sweep Mode Specifications. Figure 27.8 shows the Operating Example of Single Sweep Mode. Table 27.7 Single Sweep Mode Specifications Item
Specification Function The input voltage to the pins selected by bits ADGSEL1 to ADGSEL0 and the SCAN0 bit in the ADINSEL register is A/D converted once. Resolution 8 bits or 10 bits A/D conversion start condition * Software trigger * Timer RC * External trigger (Refer to 27.3.3 A/D Conversion Start Condition) A/D conversion stop condition * If two pins are selected, when A/D conversion of the two selected pins completes (the ADST bit in the ADCON0 register is set to 0). * If four pins are selected, when A/D conversion of the four selected pins completes (the ADST bit is set to 0). * Set the ADST bit to 0. Interrupt request generation * If two pins are selected, when A/D conversion of the two selected pins completes. timing * If four pins are selected, when A/D conversion of the four selected pins completes. Analog input pin AN8 to AN9(2 pins), AN8 to AN11(4 pins), (Selectable by the SCAN0 bit and bits ADGSEL1 to ADGSEL0.) Storage resister for A/D AD0 register: AN8 conversion result AD1 register: AN9 AD2 register: AN10 AD3 register: AN11 Reading of result of A/D Read the registers from AD0 to AD3 corresponding to the selected pin. converter
REJ09B0458-0010 Rev.0.10 Page 449 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
ADST bit in ADCON0 register
"1" "0"
Successive conversion register
AN8
AN9
AN10
AN11
AD0 register
Undefined
AN8 in A/D conversion result
AD1 register
Undefined
AN9 in A/D conversion result
AD2 register
Undefined
AN10 in A/D conversion result
AD3 register
Undefined
AN11 in A/D conversion result
Set to 0 when interrupt request is acknowledged, or set by a program.
IR bit in ADIC register
"1" "0"
The above applies under the following conditions: * Bits ADCAP1 to ADCAP0 in the ADMOD register are set to 00b (starts by software trigger). * The SCAN0 bit in the ADINSEL register are set to 1 (4 pins), bits ADGSEL1 to ADGSEL0 are set to 01b (AN8, AN9, AN10, AN11).
Figure 27.8
Operating Example of Single Sweep Mode
REJ09B0458-0010 Rev.0.10 Page 450 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.8
Repeat Sweep Mode
In repeat sweep mode, the input voltage to two or four pins selected from among AN8 to AN11 are A/D converted repeatedly. Table 27.8 lists the Repeat Sweep Mode Specifications. Figure 27.9 shows the Operating Example of Repeat Sweep Mode. Table 27.8 Repeat Sweep Mode Specifications Item
Specification Function The input voltage to the pins selected by bits ADGSEL1 to ADGSEL0 and the SCAN0 bit in the ADINSEL register are A/D converted repeatedly. Resolution 8 bits or 10 bits A/D conversion start condition * Software trigger * Timer RC * External trigger (Refer to 27.3.3 A/D Conversion Start Condition) A/D conversion stop condition Set the ADST bit in the ADCON0 register to 0 Interrupt request generation * If two pins are selected, when A/D conversion of the two selected pins completes. timing * If four pins are selected, when A/D conversion of the four selected pins completes. Analog input pin AN8 to AN9(2 pins), AN8 to AN11(4 pins), (Selectable by the SCAN0 bit and bits ADGSEL1 to ADGSEL0.) AD0 register: AN8 Storage resister for A/D conversion result AD1 register: AN9 AD2 register: AN10 AD3 register: AN11 Reading of result of A/D Read the registers from AD0 to AD3 corresponding to the selected pin. converter
REJ09B0458-0010 Rev.0.10 Page 451 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
ADST bit in ADCON0 register
"1" "0"
Successive conversion register
AN8
AN9
AN10
AN11
AN8
AN9
AN10
AN11
AN8
AD0 register
Undefined
AN8 in A/D conversion result
AN8 in A/D conversion result
AN8 in A/D conversion result
AD1 register
Undefined
AN9 in A/D conversion result
AN9 in A/D conversion result
AD2 register
Undefined
AN10 in A/D conversion result
AN10 in A/D conversion result
AD3 register
Undefined
AN11 in A/D conversion result
Set to 0 when interrupt request is acknowledged, or set by a program.
AN11 in A/D conversion result
Set to 0 when interrupt request is acknowledged, or set by a program.
IR bit in ADIC register
"1" "0"
The above applies under the following conditions: * Bits ADCAP1 to ADCAP0 in the ADMOD register are set to 00b (starts by software trigger). * The SCAN0 bit in the ADINSEL register are set to 1 (4 pins), bits ADGSEL1 to ADGSEL0 are set to 01b (AN8, AN9, AN10, and AN11).
Figure 27.9
Operating Example of Repeat Sweep Mode
REJ09B0458-0010 Rev.0.10 Page 452 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.9
Internal Equivalent Circuit of Analog Input
Figure 27.10 shows the Internal Equivalent Circuit of Analog Input.
VCC VCC VSS AVCC Parasitic Diode AN8 ON Resistor Wiring Resistor TBD k TBD k SW1 Parasitic Diode ON Resistor TBD k Analog Input Voltage SW2 VIN ON Resistor Approx. TBD k SW3
C = Approx.TBD pF
AMP
Sampling Control Signal VSS i Ladder-type Switches i Ladder-type Wiring Resistors
SW4
i=4
ON Resistor Wiring Resistor TBD k TBD k AN11 SW1
AVSS
Chopper-type Amplifier
b6 b0 b4 b7 b1 b5 ADINSEL b2 ADINSEL register register ADINSEL register
A/D Successive Conversion Register
Reference Control Signal
VREF
Vref
Resistor ladder
AVSS
Comparison voltage ON Resistor
SW5 TBD k
A/D Conversion Interrupt Request
Comparison reference voltage (Vref) generator
Sampling C parison om C onnect to
SW1 conducts only on the ports selected for analog input. SW2 and SW3 are open when A/D conversion is not in progress; their status varies as shown by the waveforms in the diagrams on the left.
Control signal for SW2
C onnect to
C onnect to
SW4 conducts only when A/D conversion is not in progress.
C onnect to
Control signal for SW3
SW5 conducts when compare operation is in progress.
Note: 1. Use only as a standard for designing this data. Mass production may cause some changes in device characteristics.
Figure 27.10
Internal Equivalent Circuit of Analog Input
REJ09B0458-0010 Rev.0.10 Page 453 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.10 Output Impedance of Sensor under A/D Conversion
To carry out A/D conversion properly, charging the internal capacitor C shown in Figure 27.11 has to be completed within a specified period of time. T (sampling time) as the specified time. Let output impedance of sensor equivalent circuit be R0, internal resistance of microcomputer be R, precision (error) of the A/D converter be X, and the resolution of A/D converter be Y (Y is 1024 in the 10-bit mode, and 256 in the 8-bit mode). 1 - -------------------------C ( R0 + R ) VC = VIN 1 - e t
VC is generally
And when t = T,
X X VC = VIN - --- VIN = VIN 1 - --- Y Y 1 - --------------------------T C ( R0 + R ) = X --e Y 1 - -------------------------- T = ln X --C ( R0 + R ) Y
Hence,
T R0 = - ------------------- - R X C * ln --Y
Figure 27.11 shows Analog Input Pin and External Sensor Equivalent Circuit. When the difference between VIN and VC becomes 0.1LSB, we find impedance R0 when voltage between pins VC changes from 0 to VIN(0.1/1024) VIN in time T. (0.1/1024) means that A/D precision drop due to insufficient capacitor charge is held to 0.1LSB at time of A/D conversion in the 10-bit mode. Actual error however is the value of absolute precision added to 0.1LSB. T = TBD s when f(AD) = TBD MHz. Output impedance R0 for sufficiently charging capacitor C within time T is determined as follows. T = TBD s, R = TBD k, C = TBD pF, X = 0.1, and Y = 1024. Hence, TBD R0 = - ----------------------------------- - TBD TBD 0.1 TBD * ln ----------1024 Thus, the allowable output impedance of the sensor equivalent circuit, making the precision (error) 0.1LSB or less, is approximately TBD k. maximum.
MCU Sensor equivalent circuit R0 VIN C (TBD pF) VC R (TBD k)
Note: 1. The capacity of the terminal is assumed to be TBD pF.
Figure 27.11
Analog Input Pin and External Sensor Equivalent Circuit Apr 01, 2008
REJ09B0458-0010 Rev.0.10 Page 454 of 572
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
27. A/D Converter
27.11 Notes on A/D Converter
* Write to the ADMOD register, the ADINSEL register, the ADCON0 register (other than ADST bit), the *
ADCON1 register, the OCVREFCR register when A/D conversion is stopped (before a trigger occurs). To use the A/D converter in repeat mode 0, repeat mode 1, or repeat sweep mode, select the frequency of the A/D converter operating clock AD or more for the CPU clock during A/D conversion. Do not select fOCO-F as AD. Connect 0.1 F capacitor between the VREF pin and AVSS pin. Do not enter stop mode during A/D conversion. Do not enter wait mode during A/D conversion regardless of the state of the CM02 bit in the CM0 register (1: Peripheral function clock stops in wait mode or 0: Peripheral function clock does not stop in wait mode). Do not set the FMSTP bit in the FMR0 register to 1 (flash memory stops) during A/D conversion.
* * * *
REJ09B0458-0010 Rev.0.10 Page 455 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28. Comparator A
Comparator A compares a reference input voltage and an analog input voltage. Comparator A1 and comparator A2 are independent of each other. Note that these comparators share the voltage detection circuit with voltage monitor 1 and voltage monitor 2. Either comparator A1 and comparator A2 or voltage monitor 1 and voltage monitor 2 can be selected to use the voltage detection circuit.
28.1
Overview
The comparison result of the reference input voltage and analog input voltage can be read by software. The result also can be output from the VCOUTi (i = 1 or 2) pin. An input voltage to the LVREF pin can be selected as the reference input voltage. Also, the comparator A1 interrupt and comparator A2 interrupt can be used. Table 28.1 lists the Comparator A Specifications, Figure 28.1 shows a Comparator A Block Diagram, and Table 28.2 lists the Pin Configuration of Comparator A. Table 28.1 Comparator A Specifications
Comparator A1 Comparator A2 Input voltage to the LVCMP1 pin Input voltage to the LVCMP2 pin Input voltage to the LVREF pin Whether passing thorough the reference input voltage by rising or falling. The VW1C3 bit in the VW1C register The VCA13 bit in the VCA1 register Whether higher or lower than the reference input voltage. Comparator A1 interrupt Comparator A2 interrupt (non-makable or maskable selectable) (non-makable or maskable selectable) Interrupt request at: Interrupt request at: Reference input voltage > Reference input voltage > input voltage to the LVCMP1 pin input voltage to the LVCMP2 pin and/or and/or Input voltage to the LVCMP1 pin > Input voltage to the LVCMP2 pin > reference input voltage reference input voltage Supported (fOCO-S divided by n) x 2 n: 1, 2, 4, and 8 Output from the LVCOUT1 pin (Whether the comparison result output is inverted or not can be selected.)
Item Analog input voltage Reference input voltage Comparison target Comparison result monitor Interrupt
Digital Switching Filter enable/disable Sampling time Comparison result output
Output from the LVCOUT2 pin (Whether the comparison result output is inverted or not can be selected.)
REJ09B0458-0010 Rev.0.10 Page 456 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
Shared with voltage monitor 1 circuit
VCA22
0
VCA26
= 01b fOCO-S/2 = 10b fOCO-S/4 = 11b fOCO-S/8 VW1C1
0 1
fOCO-S
VW1F1 to VW1F0 = 00b Sampling clock CM1POR
Pin output selection circuit
CM1OE
LVCMP1
1
+ VW1C3
Digital filter VW1C2
Edge
0 1
LVCOUT1
selection circuit
Non-maskable interrupts Maskable interrupts
Shared with voltage monitor 2 circuit
VCA24
0
VCA27
= 01b fOCO-S/2 = 10b fOCO-S/4 = 11b fOCO-S/8 VW2C1
0 1
fOCO-S
VW2F1 to VW2F0 = 00b Sampling clock
VW1C0 IRQ1SEL
CM2POR
LVCMP2
1
+ -
CM2OE Digital filter VW2C2
0 1
LVCOUT2
VCA23
1
VCA13
Edge
selection circuit
Non-maskable interrupts Maskable interrupts
LVREF
0 VW2C0 IRQ2SEL
Internal reference voltage
VCA13: Bit in VCA1 register VCA21, VCA22, VCA23, VCA24, VCA26, VCA27: Bits in VCA2 register VW1C0 to VW1C3, VW1F0, VW1F1: Bits in VW1C register VW2C0, VW2C2, VW2F0, VW2F1: Bits in VW2C register CM1POR, CM2POR, CM1OE, CM2OE, IRQ1SEL, IRQ2SEL: Bits in CMPA register
Figure 28.1 Table 28.2 Pin Name LVCMP1 LVCOUT1 LVCMP2 LVCOUT2 LVREF
Comparator A Block Diagram Pin Configuration of Comparator A I/O Input Output Input Output Input Function Comparator A1 analog pin Comparator A1 comparison result output pin Comparator A2 analog pin Comparator A2 comparison result output pin Comparator reference voltage pin
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28.2 28.2.1
Registers Voltage Monitor Circuit/Comparator A Control Register (CMPA)
b6 -- 0 b5 IRQ2SEL 0 b4 IRQ1SEL 0 b3 CM2OE 0 b2 CM1OE 0 b1 CM2POR 0 b0 CM1POR 0 R/W R/W
Address 0030h Bit b7 Symbol COMPSEL After Reset 0 Bit b0 Symbol CM1POR
b1
b2 b3 b4 b5 b6 b7
Function 0: Non-inverted comparator A1 comparison result is output to LVCOUT1. 1: Inverted comparator A1 comparison result is output to LVCOUT1. 0: Non-inverted Comparator A2 comparison result is CM2POR LVCOUT2 output polarity select bit output to LVCOUT2. 1: Inverted comparator A2 comparison result is output to LVCOUT2. CM1OE LVCOUT1 output enable bit 0: Output disabled 1: Output enabled CM2OE LVCOUT2 output enable bit 0: Output disabled 1: Output enabled IRQ1SEL Voltage monitor 1/comparator A1 0: Non-maskable interrupt interrupt type select bit 1: Maskable interrupt IRQ2SEL Voltage monitor 2/comparator A2 0: Non-maskable interrupt interrupt type select bit 1: Maskable interrupt -- Reserved bit Set to 0. COMPSEL Voltage monitor/comparator A 0: Bits IRQ1SEL and IRQ2SEL disabled interrupt type selection enable bit 1: Bits IRQ1SEL and IRQ2SEL enabled
Bit Name LVCOUT1 output polarity select bit
R/W
R/W R/W R/W R/W R/W R/W
28.2.2
Voltage Monitor Circuit Edge Select Register (VCAC)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 VCAC2 0 b1 VCAC1 0 b0 -- 0 R/W -- R/W R/W --
Address 0031h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name Function -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. VCAC1 Comparator A1 circuit edge select bit (1) 0: One edge 1: Both edges VCAC2 Comparator A2 circuit edge select bit (2) 0: One edge 1: Both edges -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- -- -- --
Notes: 1. When the VCA1 bit is set tot 0 (one edge), the VW1C7 bit in the VW1C register is enabled. Set the VW1C7 bit after setting the VCAC1 bit to 0. 2. When the VCA2 bit is set tot 0 (one edge), the VW2C7 bit in the VW2C register is enabled. Set the VW2C7 bit after setting the VCAC2 bit to 0.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28.2.3
Voltage Detect Register (VCA1)
b6 -- 0 b5 -- 0 b4 -- 0 b3 VCA13 1 b2 -- 0 b1 -- 0 b0 -- 0 R/W R/W
Address 0033h Bit b7 Symbol -- After Reset 0 Bit b0 b1 b2 b3
b4 b5 b6 b7
Symbol Bit Name Function -- Reserved bits Set to 0. -- -- VCA13 Comparator A2 signal monitor flag (1) 0: LVCMP2 < reference voltage 1: LVCMP2 reference voltage or comparator A2 circuit disabled -- Reserved bits Set to 0. -- -- --
R
R/W
Note: 1. When the VCA27 bit in the VCA2 register is set to 1 (comparator A2 circuit enabled), the VCA13 bit is enabled. When the VCA27 bit in the VCA2 register is set to 0 (comparator A2 circuit disabled), the VCA13 bit is set to 1 (VCMP2 reference voltage).
REJ09B0458-0010 Rev.0.10 Page 459 of 572
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28.2.4
Voltage Detect Register 2 (VCA2)
b2 VCA22 0 0 b1 VCA21 0 0 b0 VCA20 0 0 R/W R/W R/W R/W R/W R/W R/W R/W R/W
Address 0034h Bit b7 b6 b5 b4 b3 Symbol VCA27 VCA26 VCA25 VCA24 VCA23 After Reset The LVDAS bit in the OFS register is set to 1. 0 0 0 0 0 After Reset The LVDAS bit in the OFS register is set to 0. 0 0 1 0 0 Bit b0 b1 b2 b3 b4 b5 b6 b7 Symbol Bit Name VCA20 Internal power low consumption enable bit (1) VCA21 Comparator A1 reference voltage input select bit VCA22 LVCMP1 comparison voltage external input select bit VCA23 Comparator A2 reference voltage input select bit VCA24 LVCMP2 comparison voltage external input select bit VCA25 Voltage detection 0 enable bit (3) VCA26 VCA27 Voltage detection 1/comparator A1 enable bit (3) Voltage detection 2/comparator A2 enable bit (5)
Function 0: Low consumption disabled 1: Low consumption enabled (2) 0: Internal reference voltage 1: LVREF pin input voltage 0: Supply voltage (VCC) 1: LVCMP1 pin input voltage 0: Internal reference voltage 1: LVREF pin input voltage 0: Supply voltage (VCC) (Vdet2_0) 1: LVCMP2 pin input voltage (Vdet2_EXT) 0: Voltage detection 0 circuit disabled 1: Voltage detection 0 circuit enabled 0: Voltage detection 1/comparator A1 circuit disabled 1: Voltage detection 1/comparator A1 circuit enabled 0: Voltage detection 2/comparator A2 circuit disabled 1: Voltage detection 2/comparator A2 circuit enabled
Notes: 1. Use the VCA20 bit only when the MCU enters wait mode. To set the VCA20 bit, follow the procedure shown in Figure 9.3 Procedure for Reducing Internal Power Consumption Using VCA20 bit. 2. When the VCA20 bit is set to 1 (low consumption enabled), do not set the CM10 bit in the CM1 register to 1 (stop mode). 3. To use voltage monitor 0 reset, set the VCA25 bit to 1. After the VCA25 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection circuit starts operation. 4. To use the voltage detection 1/comparator A1 interrupt or the VW1C3 bit in the VW1C register, set the VCA26 bit to 1. After the VCA26 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 1/comparator A1 circuit starts operation. 5. To use the voltage detection 2/comparator A2 interrupt or the VCAC13 bit in the VCA1 register, set the VCA27 bit to 1. After the VCA27 bit is set to 1 from 0, allow td(E-A) to elapse before the voltage detection 2/comparator A2 circuit starts operation.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VCA2 register.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28.2.5
Voltage Monitor 1 Circuit Control Register (VW1C)
b6 -- 0 b5 VW1F1 0 b4 VW1F0 0 b3 VW1C3 1 b2 VW1C2 0 b1 VW1C1 1 b0 VW1C0 0 R/W R/W R/W
Address 0039h Bit b7 Symbol VW1C7 After Reset 1 Bit b0 b1
b2
b3
b4 b5
b6 b7
Symbol Bit Name Function VW1C0 Comparator A1 interrupt enable bit (1) 0: Disabled 1: Enabled 0: Digital filter enable mode VW1C1 Comparator A1 digital filter (digital filter circuit enabled) disable mode select bit (2) 1: Digital filter disable mode (digital filter circuit disabled) [Condition to set this bit to 0] VW1C2 Comparator A1 interrupt flag (3, 4) 0 is written. [Condition to set this bit to 1] When an interrupt request is generated. VW1C3 Comparator A1 signal monitor flag (3) 0: LVCMP1 < reference voltage 1: LVCMP1 reference voltage or comparator A1 circuit disabled b5 b4 VW1F0 Sampling clock select bit 0 0: fOCO-S divided by 1 VW1F1 0 1: fOCO-S divided by 2 1 0: fOCO-S divided by 4 1 1: fOCO-S divided by 8 -- Reserved bit Set to 0. 0: When LVCMP1 reaches reference voltage VW1C7 Comparator A1 interrupt or above. generation condition select bit (5) 1: When LVCMP1 reaches reference voltage or below.
R/W
R
R/W R/W
R/W R/W
Notes: 1. The VW1C0 is enabled when the VCA26 bit in the VCA2 register is set to 1 (comparator A1 circuit enabled). Set the VW1C0 bit to 0 (disabled) when the VCA26 bit is set to 0 (comparator A1 circuit disabled). To set the VW1C0 bit to 1 (enabled), follow the procedure shown in Table 28.3 Procedure for Setting Bits Associated with Comparator A1 Interrupt. 2. To use the comparator A1 interrupt to exit stop mode and to return again, write 0 and then 1 to the VW1C1 bit. 3. Bits VW1C2 and VW1C3 are enabled when the VCA26 bit in the VCA2 register is set to 1 (comparator A1 circuit enabled). 4. Set the VW1C2 bit to 0 by a program. When 0 is written by a program, this bit is set to 0 (and remains unchanged even if 1 is written to it). 5. The VW1C7 bit is enabled when the VCAC1 bit in the VCAC register is set to 0 (one edge). After setting the VCAC1 bit to 0, set the VW1C7 bit.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VW1C register. Rewriting the VW1C register may set the VW1C2 bit to 1. After rewriting this register, set the VW1C2 bit to 0.
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28.2.6
Voltage Monitor 2 Circuit Control Register (VW2C)
b6 VW2C6 0 b5 VW2F1 0 b4 VW2F0 0 b3 VW2C3 0 b2 VW2C2 0 b1 VW2C1 1 b0 VW2C0 0 R/W R/W R/W
Address 003Ah Bit b7 Symbol VW2C7 After Reset 1 Bit b0 b1
Symbol Bit Name VW2C0 Comparator A2 interrupt enable bit (1) VW2C1
b2
VW2C2
b3 b4 b5
VW2C3 VW2F0 VW2F1
b6 b7
VW2C6 VW2C7
Function 0: Disabled 1: Enabled Comparator A2 digital filter disable mode 0: Digital filter enable mode (digital filter circuit enabled) select bit (2) 1: Digital filter disable mode (digital filter circuit disabled) [Condition to set this bit to 0] Comparator A2 interrupt flag (3, 4) 0 is written. [Condition to set this bit to 1] When an interrupt request is generated. 0: Not detected WDT detection monitor flag (4) 1: Detected b5 b4 Sampling clock select bit 0 0: fOCO-S divided by 1 0 1: fOCO-S divided by 2 1 0: fOCO-S divided by 4 1 1: fOCO-S divided by 8 Reserved bit Set to 0. 0: When LVCMP2 reaches reference voltage Comparator A2 interrupt or above. generation condition select bit (5) 1: When LVCMP2 reaches reference voltage or below.
R/W
R/W R/W R/W
R/W R/W
Notes: 1. The VW2C0 is enabled when the VCA27 bit in the VCA2 register is set to 1 (comparator A2 circuit enabled). Set the VW2C0 bit to 0 (disabled) when the VCA27 bit is set to 0 (comparator A2 circuit disabled). To set the VW1C0 bit to 1 (enabled), follow the procedure shown in Table 28.4 Procedure for Setting Bits Associated Comparator A2 Interrupt. 2. To use the comparator A2 interrupt to exit stop mode and to return again, write 0 and then 1 to the VW2C1 bit. 3. The VW2C2 bit is enabled when the VCA27 bit in the VCA2 register is set to 1 (comparator A2 circuit enabled). 4. Set this bit to 0 by a program. When 0 is written by a program, this bit is set to 0 (and remains unchanged even if 1 is written to it). 5. The VW2C7 bit is enabled when the VCAC2 bit in the VCAC register is set to 0 (one edge). After setting the VCAC2 bit to 0, set the VW2C7 bit.
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the VW2C register. Rewriting the VW2C register may set the VW2C2 bit to 1. After rewriting this register, set the VW2C2 bit to 0.
REJ09B0458-0010 Rev.0.10 Page 462 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28.3 28.3.1
Monitoring Comparison Results Monitoring Comparator A1
Once the following settings are made, the comparison result of comparator A1 can be monitored by the VW1C3 bit in the VW1C register after td(E-A) has elapsed (refer to 32. Electrical Characteristics). (1) Set the VCA21 bit in the VCA2 register to 1 (LVREF pin input voltage). (2) Set the VCA22 bit in the VCA2 register to 1 (LVCMP1 pin input voltage). (3) Set the VCA26 bit in the VCA2 register to 1 (comparator A1 circuit enabled).
28.3.2
Monitoring Comparator A2
Once the following settings are made, the comparison result of comparator A2 can be monitored by the VCA13 bit in the VCA1 register after td(E-A) has elapsed (refer to 32. Electrical Characteristics). (1) Set the VCA23 bit in the VCA2 register to 1 (LVREF pin input voltage). (2) Set the VCA24 bit in the VCA2 register to 1 (LVCMP2 pin input voltage). (3) Set the VCA27 bit in the VCA2 register to 1 (comparator A2 circuit enabled).
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28.4
Functional Description
Comparator A1 and comparator A2 operate independently. The comparison result of the reference input voltage and analog input voltage can be read by software. The result can also be output from the LVCOUTi (i = 1 or 2) pin. An input voltage to the LVREF pin can be used as the reference input voltage. The comparator A1 interrupt or the comparator A2 interrupt can be used by selecting nonmaskable or maskable for each interrupt type.
28.4.1
Comparator A1
Table 28.3 lists the Procedure for Setting Bits Associated with Comparator A1 Interrupt, Figure 28.2 shows a Comparator A1 Operating Example (Digital Filter Enabled), and Figure 28.3 shows a Comparator A1 Operating Example (Digital Filter Disabled). Table 28.3 Step 1 2 3 4 5 6 7 (1) 8 9 10 11 12 Procedure for Setting Bits Associated with Comparator A1 Interrupt When Using Digital Filter When Using No Digital Filter Set the COMPSEL bit in the CMPA register to 1 (bits IRQ1SEL and IRQ2SEL enabled). Set the VCA21 bit in the VCA2 register to 1 (LVREF pin input voltage) and the VCA22 bit to 1 (LVCMP1 pin input voltage). Set the VCA26 bit in the VCA2 register to 1 (comparator A1 circuit enabled). Wait for td(E-A). Select the interrupt type by the IRQ1SEL bit in the CMPA register. Select the sampling clock of the digital filter by Set the VW1C1 bit in the VW1C register to 1 bits VW1F0 and VW1F1 in the VW1C register. (digital filter disabled). Set the VW1C1 bit in the VW1C register to 0 - (digital filter enabled). Select the interrupt request timing by the VCAC1 bit in the VCAC register and the VW1C7 bit in the VW1C register. Set the VW1C2 bit in the VW1C register to 0. Set the CM14 bit in the CM1 register to 0 - (low-speed on-chip oscillator on). Wait for 2 cycles of the sampling clock of - (No wait time required) the digital filter. Set the VW1C0 bit in the VW1C register to 1 (comparator A1 interrupt enabled).
Note: 1. When the VW1C0 bit is set to 0, steps 6 and 7 can be executed at the same time (with one instruction).
REJ09B0458-0010 Rev.0.10 Page 464 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
LVCMP1 Reference voltage (LVREF)
1 VW1C3 bit 0 Sampling clock of digital filter x 2 cycles 1 VW1C2 bit 0 Set to 0 by a program. VW1C1 bit is set to 0 (digital filter enabled) and VCAC1 bit is set to 1 (both edges) Set to 0 when an interrupt request is acknowledged or by a program. IR bit in VCMP1IC register (IRQ1SEL = 1) 1 0 Sampling clock of digital filter x 2 cycles
LVCOUT1 output (CM1POR = 0)
1 0 Set to 0 by a program. 1
VW1C2 bit 0 VW1C1 bit is set to 0 (digital filter enabled), VCAC1 bit is set to 0 (one edge), and VW1C7 bit is set to 0 (when LVCMP1 reaches reference voltage or above) IR bit in VCMP1IC register (IRQ1SEL = 1) 1 0 1 0 Set to 0 when an interrupt request is acknowledged or by a program.
LVCOUT1 output (CM1POR = 0)
1 VW1C1 bit is set to 0 (digital filter enabled), VCAC1 bit is set to 0 (one edge), and VW1C7 bit is set to 1 (when LVCMP1 reaches reference voltage or below) VW1C2 bit 0 IR bit in VCMP1IC register (IRQ1SEL = 1) 1 0 1 0
Set to 0 by a program.
Set to 0 when an interrupt request is acknowledged or by a program.
LVCOUT1 output (CM1POR = 1)
VW1C1, VW1C2, VW1C3, VW1C7: Bits in VW1C register VCAC1: Bit in VCAC register CM1POR, IRQ1SEL: Bits in CMPA register The above applies when: * VCA26 bit in VCA2 register = 1 (comparator A1 circuit enabled) * VW1C0 bit in VW1C register = 1 (comparator A1 interrupt enabled) * CM1OE bit in CMPA register = 1 (output enabled) * VCA22 bit in VCA2 register = 1 (LVCMP1 pin input voltage) * COMPSEL bit in CMPA register = 1 (bits IRQ1SEL and IRQ2SEL enabled)
Figure 28.2
Comparator A1 Operating Example (Digital Filter Enabled)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
LVCMP1 Reference voltage (LVREF)
1 VW1C3 bit 0
Set to 0 by a program. 1 VW1C2 bit 0 VW1C1 bit is set to 1 (digital filter disabled) and VCAC1 bit is set to 1 (both edges) IR bit in VCMP1IC register (IRQ1SEL = 1) 1 0 1 0 Set to 0 by a program. 1 VW1C2 bit VW1C1 bit is set to 1 (digital filter disabled), VCAC1 bit is set to 0 (one edge), and VW1C7 bit is set to 0 (when LVCMP1 reaches reference voltage or above) 0 IR bit in VCMP1IC register (IRQ1SEL = 1) 1 0 1 0 Set to 0 when an interrupt request is acknowledged or by a program. Set to 0 when an interrupt request is acknowledged or by a program.
LVCOUT1 output (CM1POR = 0)
LVCOUT1 output (CM1POR = 0)
1 VW1C1 bit is set to 1 (digital filter disabled), VCAC1 bit is set to 0 (one edge), and VW1C7 bit is set to 1 (when LVCMP1 reaches reference voltage or below) VW1C2 bit 0 IR bit in VCMP1IC register (IRQ1SEL = 1) LVCOUT1 output (CM1POR = 1) 1 0 1 0
Set to 0 by a program.
Set to 0 when an interrupt request is acknowledged or by a program.
VW1C1, VW1C2, VW1C3, VW1C7: Bits in VW1C register VCAC1: Bit in VCAC register CM1POR, IRQ1SEL: Bits in CMPA register The above applies under when: * VCA26 bit in VCA2 register = 1 (comparator A1 circuit enabled) * VW1C0 bit in VW1C register = 1 (comparator A1 interrupt enabled) * CM1OE bit in CMPA register = 1 (output enabled) * VCA22 bit in VCA2 register = 1 (LVCMP1 pin input voltage) * COMPSEL bit in CMPA register = 1 (bits IRQ1SEL and IRQ2SEL enabled)
Figure 28.3
Comparator A1 Operating Example (Digital Filter Disabled)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28.4.2
Comparator A2
Table 28.4 lists the Procedure for Setting Bits Associated Comparator A2 Interrupt, Figure 28.4 shows a Comparator A2 Operating Example (Digital Filter Enabled), and Figure 28.5 shows a Comparator 2 Operating Example (Digital Filter Disabled). Table 28.4 Step 1 2 3 4 5 6 7 (1) 8 9 10 11 12 Procedure for Setting Bits Associated Comparator A2 Interrupt When Using Digital Filter When Using No Digital Filter Set the COMPSEL bit in the CMPA register to 1 (bits IRQ1SEL and IRQ2SEL enabled). Set the VCA23 bit in the VCA2 register to 1 (LVREF pin input voltage) and the VCA24 bit to 1 (LVCMP2 pin input voltage). Set the VCA27 bit in the VCA2 register to 1 (comparator A2 circuit enabled). Wait for td(E-A). Select the interrupt type by the IRQ2SEL bit in the CMPA register. Select the sampling clock of the digital filter by Set the VW2C1 bit in the VW2C register to 1 bits VW2F0 and VW2F1 in the VW2C register. (digital filter disabled). Set the VW2C1 bit in the VW2C register to 0 - (digital filter enabled). Select the interrupt request timing by the VCAC2 bit in the VCAC register and the VW2C7 bit in the VW2C register. Set the VW2C2 bit in the VW2C register to 0. Set the CM14 bit in the CM1 register to 0 (low- - speed on-chip oscillator on). Wait for 2 cycles of the sampling clock of - (No wait time required) the digital filter. Set the VW2C0 bit in the VW2C register to 1 (comparator A2 interrupt enabled).
Note: 1. When the VW2C0 bit is set to 0, steps 6 and 7 can be executed at the same time (with one instruction).
REJ09B0458-0010 Rev.0.10 Page 467 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
LVCMP2 Reference voltage (LVREF)
1 VCA13 bit 0 Sampling clock of digital filter x 2 cycles 1 VW2C2 bit 0 Set to 0 by a program. VW2C1 bit is set to 0 (digital filter enabled) and VCAC2 bit is set to 1 (both edges) Set to 0 when an interrupt request is acknowledged or by a program. IR bit in VCMP2IC register (IRQ2SEL = 1) 1 0 Sampling clock of digital filter x 2 cycles
LVCOUT2 output (CM2POR = 0)
1 0 Set to 0 by a program. 1
VW2C2 bit 0 VW2C1 bit is set to 0 (digital filter enabled), VCAC2 bit is set to 0 (one edge), and VW2C7 bit is set to 0 (when LVCMP2 reaches reference voltage or above) IR bit in VCMP2IC register (IRQ2SEL = 1) 1 0 1 0 Set to 0 when an interrupt request is acknowledged or by a program.
LVCOUT2 output (CM2POR = 0)
1 VW2C1 bit is set to 0 (digital filter enabled), VCAC2 bit is set to 0 (one edge), and VW2C7 bit is set to 1 (when LVCMP2 reaches reference voltage or below) VW2C2 bit 0 IR bit in VCMP2IC register (IRQ2SEL = 1) 1 0 1 0
Set to 0 by a program.
Set to 0 when an interrupt request is acknowledged or by a program.
LVCOUT2 output (CM2POR = 1)
VCA13: Bit in VCA1 register VW2C1, VW2C2, VW2C7: Bits in VW2C register VCAC2: Bit in VCAC register CM2POR, IRQ2SEL: Bits in CMPA register The above applies when: * VCA27 bit in VCA2 register = 1 (comparator A2 circuit enabled) * VW2C0 bit in VW2C register = 1 (comparator A2 interrupt enabled) * CM2OE bit in CMPA register = 1 (output enabled) * VCA24 bit in VCA2 register = 1 (LVCMP2 pin input voltage) * COMPSEL bit in CMPA register = 1 (bits IRQ1SEL and IRQ2SEL enabled)
Figure 28.4
Comparator A2 Operating Example (Digital Filter Enabled)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
VCMP2 Reference voltage (LVREF)
1 VCA13 bit 0
Set to 0 by a program. 1 VW2C2 bit 0 VW2C1 bit is set to 1 (digital filter disabled) and VCAC2 bit is set to 1 (both edges) IR bit in VCMP2IC register (IRQ2SEL = 1) 1 0 1 0 Set to 0 by a program. 1 VW2C2 bit VW2C1 bit is set to 1 (digital filter disabled), VCAC2 bit is set to 0 (one edge), and VW2C7 bit is set to 0 (when LVCMP2 reaches reference voltage or above) 0 IR bit in VCMP2IC register (IRQ2SEL = 1) 1 0 1 0 Set to 0 when an interrupt request is acknowledged or by a program. Set to 0 when an interrupt request is acknowledged or by a program.
LVCOUT2 output (CM2POR = 0)
LVCOUT2 output (CM2POR = 0)
1 VW2C2 bit VW2C1 bit is set to 1 (digital filter disabled), VCAC2 bit is set to 0 (one edge), and VW2C7 bit is set to 1 (when LVCMP2 reaches reference voltage or below) 0 IR bit in VCMP2IC register (IRQ2SEL = 1) LVCOUT2 output (CM2POR = 1) 1 0 1 0
Set to 0 by a program.
Set to 0 when an interrupt request is acknowledged or by a program.
VCA13: Bit in VCA1 register VW2C1, VW2C2, VW2C7: Bits in VW2C register VCAC2: Bit in VCAC register CM2POR, IRQ2SEL: Bits in CMPA register The above applies when: * VCA27 bit in VCA2 register = 1 (comparator A2 circuit enabled) * VW2C0 bit in VW2C register = 1 (comparator A2 interrupt enabled) * CM2OE bit in CMPA register = 1 (output enabled) * VCA24 bit in VCA2 register = 1 (LVCMP2 pin input voltage) * COMPSEL bit in CMPA register = 1 (bits IRQ1SEL and IRQ2SEL enabled)
Figure 28.5
Comparator 2 Operating Example (Digital Filter Disabled)
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
28. Comparator A
28.5
Comparator A1 and Comparator A2 Interrupts
Comparator A generates an interrupt request from two sources, comparator A1 and comparator A2. Non-maskable or maskable can be selected for each interrupt type. Refer to 11. Interrupts for details of interrupts.
28.5.1
Non-Maskable Interrupts
When the COMPSEL bit in the CMPA register is set to 1 (bits IRQ1SEL and IRQ2SEL enabled) and the IRQiSEL (i = 1 or 2) is set to 0, the comparator Ai interrupt functions as a non-maskable interrupt. When the selected interrupt request timing occurs, the VWiC2 bit in the VWiC register is set to 1. At this time, a non-maskable interrupt request for comparator Ai is generated.
28.5.2
Maskable Interrupts
When the COMPSEL bit in the CMPA register is set to 1 (bits IRQ1SEL and IRQ2SEL enabled) and the IRQiSEL (i = 1 or 2) is set to 1, the comparator Ai interrupt functions as a maskable interrupt. The comparator Ai interrupt uses the corresponding VCMPiIC register (bits IR and ILVL0 to ILVL2) and a single vector. When the selected interrupt request timing occurs, the VWiC2 bit in the VWiC register is set to 1. At this time, the IR bit in the VCMPiIC register is set to 1 (interrupt requested). Refer to 11.3 Interrupt Control for the VCMPiIC register and 11.1.5.2 Relocatable Vector Tables for interrupt vectors.
REJ09B0458-0010 Rev.0.10 Page 470 of 572
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Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
29. Comparator B
29. Comparator B
Comparator B compares a reference input voltage and an analog input voltage. Comparator B1 and comparator B3 are independent of each other.
29.1
Overview
The comparison result of the reference input voltage and analog input voltage can be read by software. An input to the IVREFi (i = 1 or 3) pin can be used as the reference input voltage. Table 29.1 lists the Comparator B Specifications, Figure 29.1 shows a Comparator B Block Diagram, and Table 29.2 lists the I/O Pins. Table 29.1 Comparator B Specifications Item Analog input voltage Reference input voltage Comparison result Interrupt request generation timing Selectable functions Specification Input voltage to the IVCMPi pin Input voltage to the IVREFi pin Read from the INTiCOUT bit in the INTCMP register When the comparison result changes. * Digital filter function Whether the digital filter is applied or not and the sampling frequency can be selected.
i = 1 or 3
INT3F1 to INT3F0 f1 = 01b Sampling clock f8 = 10b f32 = 11b
Port direction register INT3
INT3CP0 = 0 Digital filter (3 times match) INT3F1 to INT3F0 = other than 00b
INT3EN
To INT3 interrupt
INT3PL = 0 = 00b INT3PL = 1 Both edge detection circuit INT1EN To INT1 interrupt
IVCMP3 IVREF3
+ -
INT3CP0 = 1 INT3COUT
IVCMP1 IVREF1
+ -
INT1COUT INT1CP0 = 1 INT1F1 to INT1F0 = other than 00b INT1PL = 0 = 00b INT1PL = 1 Both edge detection circuit
Digital filter (3 times match)
INT1 Port direction register
INT1CP0 = 0
INT1F1 to INT1F0 f1 =01b f8 =10b Sampling clock f32 =11b
INT1CP0, INT1COUT, INT3CP0, INT3COUT: Bits in INTCMP register INT1EN, INT1PL, INT3EN, INT3PL: Bits in INTEN register INT1F0, INT1F1, INT3F0, INT3F1: Bits in INTF register
Figure 29.1
Comparator B Block Diagram
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
29. Comparator B
Table 29.2
I/O Pins I/O Input Input Input Input Function Comparator B1 analog pin Comparator B1 reference voltage pin Comparator B3 analog pin Comparator B3 reference voltage pin
Pin Name IVCMP1 IVREF1 IVCMP3 IVREF3
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
29. Comparator B
29.2 29.2.1
Registers Comparator B Control Register (INTCMP)
b6 -- 0 b5 -- 0 b4 b3 INT3CP0 INT1COUT 0 0 b2 -- 0 b1 -- 0 b0 INT1CP0 0 R/W R/W R/W R
Address 01F8h Bit b7 Symbol INT3COUT After Reset 0 Bit b0 b1 b2 b3 Symbol INT1CP0
-- -- INT1COUT Comparator B1 monitor flag
Bit Name Function Comparator B1 operation enable bit 0: Comparator B1 operation disabled 1: Comparator B1 operation enabled Reserved bits Set to 0.
b4 b5 b6 b7
INT3CP0
-- -- INT3COUT Comparator B3 monitor flag
0: IVCMP1 < IVREF1 or comparator B1 operation disabled 1: IVCMP1 > IVREF1 Comparator B3 operation enable bit 0: Comparator B3 operation disabled 1: Comparator B3 operation enabled Reserved bits Set to 0. 0: IVCMP3 < IVREF3 or comparator B3 operation disabled 1: IVCMP3 > IVREF3
R/W R/W R
29.2.2
External Input Enable Register 0 (INTEN)
b6 INT3EN 0 b5 -- 0 b4 -- 0 b3 INT1PL 0 b2 INT1EN 0 b1 INT0PL 0 Function 0: Disabled 1: Enabled 0: One edge 1: Both edges 0: Disabled 1: Enabled 0: One edge 1: Both edges Set to 0. 0: Disabled 1: Enabled 0: One edge 1: Both edges b0 INT0EN 0 R/W R/W R/W R/W R/W R/W R/W R/W
Address 01FAh Bit b7 Symbol INT3PL After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name INT0EN INT0 input enable bit INT0PL INT0 input polarity select bit (1, 2) INT1EN INT1 input enable bit INT1PL INT1 input polarity select bit (1, 2) -- Reserved bits -- INT3EN INT3 input enable bit INT3PL INT3 input polarity select bit (1, 2)
Notes: 1. To set the INTiPL bit (i = 0, 1, 3) to 1 (both edges), set the POL bit in the INTiIC register to 0 (falling edge selected). 2. The IR bit in the INTiIC register may be set to 1 (interrupt requested) if the INTiPL bit is rewritten. Refer to 11.8.4 Changing Interrupt Sources.
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Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
29. Comparator B
29.2.3
INT Input Filter Select Register 0 (INTF)
b6 INT3F0 0 b5 -- 0 b4 -- 0 b3 INT1F1 0 b2 INT1F0 0 b1 INT0F1 0 Function
b1 b0
Address 01FCh Bit b7 Symbol INT3F1 After Reset 0 Bit b0 b1
b0 INT0F0 0 R/W R/W R/W
Symbol Bit Name INT0F0 INT0 input filter select bit INT0F1
0 0: No filter 0 1: Filter with f1 sampling 1 0: Filter with f8 sampling 1 1: Filter with f32 sampling
b3 b2
b2 b3
INT1F0 INT1 input filter select bit INT1F1
b4 b5 b6 b7
-- Reserved bits -- INT3F0 INT3 input filter select bit INT3F1
0 0: No filter 0 1: Filter with f1 sampling 1 0: Filter with f8 sampling 1 1: Filter with f32 sampling Set to 0.
b7 b6
R/W R/W
R/W R/W R/W
0 0: No filter 0 1: Filter with f1 sampling 1 0: Filter with f8 sampling 1 1: Filter with f32 sampling
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29. Comparator B
29.3
Functional Description
Comparator B1 and comparator B3 operate independently. Their operations are the same. Table 29.3 lists the Procedure for Setting Registers Associated with Comparator B. Table 29.3 Procedure for Setting Registers Associated with Comparator B
Step Register Bit Setting Value 1 Select the function of pins IVCMPi and IVREFi. Refer to 7.5 Port Settings. However, set registers and bits other than listed in step 2 and the following steps. 2 INTF Select whether to enable or disable the filter. Select the sampling clock. 3 INTCMP INTiCP0 1 (operation enabled) 4 Wait for comparator stability time (TBD s max.) 5 INTEN INTiEN When using an interrupt: 1 (interrupt enabled) INTiPL When using an interrupt: Select the input polarity. 6 INTiIC ILVL2 to ILVL0 When using an interrupt: Select the interrupt priority level. IR When using an interrupt: 0 (no interrupt requested: initialization) i = 1 or 3 Figure 29.2 shows an Operating Example of Comparator Bi (i = 1 or 3). If the analog input voltage is higher than the reference input voltage, the INTiCOUT bit in the INTCMP register is set to 1. If the analog input voltage is lower than the reference input voltage, the INTiCOUT bit is set to 0. To use the comparator Bi interrupt, set the INTiEN bit in the INTEN register to 1 (interrupt enabled). If the comparison result changes at this time, a comparator Bi interrupt request is generated. Refer to 29.4 Comparator B1 and Comparator B3 Interrupts for details of interrupts.
Analog input voltage (V)
Reference input voltage
0
INTiCOUT bit in INTCMP register
1 0 Set to 0 by a program.
IR bit in INTiIC register
1 0
The above applies when: Bits INTiF1 to INTiF0 in INTF register = 00b (no filter) INTiPL bit in the INTEN register = 0 (both edges) i = 1 or 3
Figure 29.2
Operating Example of Comparator Bi (i = 1 or 3)
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29. Comparator B
29.3.1
Comparator Bi Digital Filter (i = 1 or 3)
Comparator Bi can use the same digital filter as the INTi input. The sampling clock can be selected by bits INTiF1 and INTiF0 in the INTF register. The INTiCOUT signal output from comparator Bi is sampled every sampling clock. When the level matches three times, the IR bit in the INTiIC register is set to 1 (interrupt requested). Figure 29.3 shows a Configuration of Comparator Bi Digital Filter, and Figure 29.4 shows an Operating Example of Comparator Bi Digital Filter.
INTiF1 to INTiF0
f1 f8 f32
= 01b = 10b = 11b INTiEN
INTiCP0 = 0
Sampling clock
INTi Port direction register
Digital filter (match 3 times)
INTiCP0 = 1
INTiF1 to INTiF0 = other than 00b
To INTi interrupt
INTiPL = 0
= 00b Both edge detection circuit
INTiCOUT
IVCMPi IVREFi
+ -
INTiPL = 1
i = 1 or 3 INTiCP0, INTiCOUT: Bits in INTCMP register INTiF0 to INTiF1: Bits in INTF register INTiEN, INTiPL: Bits in INTEN register
Figure 29.3
Configuration of Comparator Bi Digital Filter
INTiCOUT signal Sampling timing
IR bit in INTiIC register
Set to 0 by a program. Note: The above applies when: Bits INTiF1 to INTiF0 in the INTiF register are set to 01b, 10b, or 11b (digital filter used). i =1 or 3
Figure 29.4
Operating Example of Comparator Bi Digital Filter
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R8C/32A Group
29. Comparator B
29.4
Comparator B1 and Comparator B3 Interrupts
Comparator B generates an interrupt request from two sources, comparator B1 and comparator B3. The comparator Bi (i = 1 or 3) interrupt uses the same INTiIC register (bits IR and ILVL0 to ILVL2) as the INTi (i = 1 or 3) and a single vector. To use the comparator Bi interrupt, set the INTiEN bit in the INTEN register to 1 (interrupt enabled). In addition, the polarity can be selected by the INTiPL bit in the INTEN register and the POL bit in the INTiIC register. Inputs can also be passed through the digital filter with three different sampling clocks.
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R8C/32A Group
30. Flash Memory
30. Flash Memory
The flash memory can perform in the following three rewrite modes: CPU rewrite mode, standard serial I/O mode, and parallel I/O mode.
30.1
Overview
Table 30.1 lists the Flash Memory Version Performance. (Refer to Table 1.1 and Table 1.2 R8C/32A Group Specifications for items not listed in Table 30.1.) Table 30.1 Flash Memory Version Performance
Specification 3 modes (CPU rewrite, standard serial I/O, and parallel I/O) Refer to Figure 30.1. Byte units Block erase Program and erase control by software commands Rewrite protect control in block units by the lock bit Individual rewrite protect control on blocks A, B, C, and D by bits FMR14, FMR15, FMR16, and FMR17 in the FMR1 register 8 commands 1,000 times 10,000 times Standard serial I/O mode supported Parallel I/O mode supported
Item Flash memory operating mode Division of erase blocks Programming method Erasure method
Programming and erasure control method (1) Rewrite control Blocks 0 to 2 method (Program ROM) Blocks A, B, C, and D (Data flash) Number of commands Blocks 0 to 2 Programming and erasure endurance (2) (Program ROM) Blocks A, B, C, and D (Data flash) ID code check function ROM code protection
Notes: 1. To perform programming and erasure, use VCC = 2.7 V to 5.5 V as the supply voltage. Do not perform programming and erasure at less than 2.7 V. 2. Definition of programming and erasure endurance The programming and erasure endurance is defined on a per-block basis. If the programming and erasure endurance is n (n = 100 or 10,000), each block can be erased n times. For example, if 1,024 1-byte writes are performed to block A, a 1-Kbyte block, and then the block is erased, the erase count stands at one. When performing 100 or more rewrites, the actual erase count can be reduced by executing program operations in such a way that all blank areas are used before performing an erase operation. Avoid rewriting only particular blocks and try to average out the programming and erasure endurance of the blocks. It is also advisable to retain data on the erase count of each block and limit the number of erase operations to a certain number.
Table 30.2
Flash Memory Rewrite Mode
CPU Rewrite Mode Standard Serial I/O Mode User ROM area is rewritten using a dedicated serial programmer. User ROM Standard boot program Parallel I/O Mode User ROM area is rewritten using a dedicated parallel programmer. User ROM -
Flash Memory Rewrite Mode Function
User ROM area is rewritten by executing software commands from the CPU. Rewritable area User ROM Rewrite programs User program
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R8C/32A Group
30. Flash Memory
30.2
Memory Map
The flash memory contains a user ROM area and a boot ROM area (reserved area). Figure 30.1 show the R8C/32A Group Flash Memory Block Diagrams. The user ROM area contains program ROM and data flash. Program ROM: Flash memory mainly used for storing programs Data flash: Flash memory mainly used for storing data to be rewritten The user ROM area is divided into several blocks. The user ROM area can be rewritten in CPU rewrite mode, standard serial I/O mode, or parallel I/O mode. The rewrite control program (standard boot program) for standard serial I/O mode is stored in the boot ROM area before shipment. The boot ROM area is allocated separately from the user ROM area.
ROM 4 KB product 03000h Block A: 1 Kbyte Block B: 1 Kbyte Block C: 1 Kbyte 03FFFh Block D: 1 Kbyte 03FFFh 03000h
ROM 8 KB product Block A: 1 Kbyte Block B: 1 Kbyte Block C: 1 Kbyte Block D: 1 Kbyte 03FFFh 03000h
ROM 16 KB product Block A: 1 Kbyte Block B: 1 Kbyte Data flash Block C: 1 Kbyte Block D: 1 Kbyte
0C000h 0F000h 0F7FFh 0F800h 0FFFFh Block 1: 2 Kbytes Block 0: 2 Kbytes User ROM area 0E000h 0EFFFh 0F000h 0F7FFh 0F800h 0FFFFh Block 2: 8 Kbytes Block 2: 4 Kbytes Block 1: 2 Kbytes Block 0: 2 Kbytes User ROM area 0E000h 0F000h 0FFFFh Block 1: 4 Kbytes Block 0: 4 Kbytes User ROM area Program ROM
Figure 30.1
R8C/32A Group Flash Memory Block Diagram
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30. Flash Memory
30.3
Functions to Prevent Flash Memory from being Rewritten
Standard serial I/O mode has an ID code check function, and parallel I/O mode has a ROM code protect function to prevent the flash memory from being read or rewritten easily.
30.3.1
ID Code Check Function
The ID code check function is used in standard serial I/O mode. Unless 3 bytes (addresses 0FFFCh to 0FFFEh) of the reset vector are set to FFFFFFh, the ID codes sent from the serial programmer or the on-chip debugging emulator and the 7-byte ID codes written in the flash memory are checked to see if they match. If the ID codes do not match, the commands sent from the serial programmer or the on-chip debugging emulator are not accepted. For details of the ID code check function, refer to 12. ID Code Areas.
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30. Flash Memory
30.3.2
ROM Code Protect Function
The ROM protect function prevents the contents of the flash memory from being read, rewritten, or erased using the OFS register in parallel I/O mode. Refer to 13. Option Function Select Area for details of the OFS register. The ROM code protect function is enabled by writing 1 to the ROMCR bit and writing 0 to the ROMCP1 bit. This prevents the contents of the on-chip flash memory from being read or rewritten. Once ROM code protection is enabled, the content of the internal flash memory cannot be rewritten in parallel I/O mode. To disable ROM code protection, erase the block including the OFS register using CPU rewrite mode or standard serial I/O mode.
30.3.3
Option Function Select Register (OFS)
b6 LVDAS 1 b5 b4 b3 b2 VDSEL1 VDSEL0 ROMCP1 ROMCR 1 1 1 1 b1 -- 1 b0 WDTON 1 (Note 1) R/W R/W R/W R/W R/W R/W R/W
Address 0FFFFh Bit b7 Symbol CSPROINI When shipping 1 Bit b0 b1 b2 b3 b4 b5
Symbol Bit Name WDTON Watchdog timer start select bit -- Reserved bit ROMCR ROM code protect disable bit ROMCP1 ROM code protect bit VDSEL0 Voltage detection 0 level select bit (2) VDSEL1
Function 0: Watchdog timer automatically starts after reset. 1: Watchdog timer is stopped after reset. Set to 1. 0: ROM code protect disabled 1: ROMCP1 bit enabled 0: ROM code protect enabled 1: ROM code protect disabled
b5 b4
b6 b7
LVDAS
Voltage detection 0 circuit start bit (3)
CSPROINI Count source protection mode after reset select bit
0 0: 3.80 V selected (Vdet0_3) 0 1: 2.85 V selected (Vdet0_2) 1 0: 2.35 V selected (Vdet0_1) 1 1: 1.90 V selected (Vdet0_0) 0: Voltage monitor 0 reset enabled after reset 1: Voltage monitor 0 reset disabled after reset 0: Count source protect mode enabled after reset 1: Count source protect mode disabled after reset
R/W R/W
Notes: 1. If the block including the OFS register is erased, the OFS register value is set to FFh. 2. The same level of the voltage detection 0 level selected by bits VDSEL0 and VDESL1 is set in both functions of voltage monitor 0 reset and power-on reset. 3. To use power-on reset, set the LVDAS bit to 0 (voltage monitor 0 reset enabled after reset).
The OFS register is allocated in the flash memory. Write to this register with a program. After writing, do not write additions to this register.
LVDAS Bit (Voltage Detection 0 Circuit Start Bit)
The Vdet0 voltage to be monitored by the voltage detection 0 circuit is selected by bits VDSEL0 and VDSEL1.
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R8C/32A Group
30. Flash Memory
30.4
CPU Rewrite Mode
In CPU rewrite mode, the user ROM area can be rewritten by executing software commands from the CPU. Therefore, the user ROM area can be rewritten directly while the MCU is mounted on a board without using a ROM programmer. Execute the software command only to blocks in the user ROM area. The flash module has an erase-suspend function which halts the erase operation temporarily during an erase operation in CPU rewrite mode. During erase-suspend, the user ROM area can be read by a program. Erase-write 0 mode (EW0 mode) and erase-write 1 mode (EW1 mode) are available in CPU rewrite mode. Table 30.3 lists the Differences between EW0 Mode and EW1 Mode. Table 30.3 Differences between EW0 Mode and EW1 Mode
EW0 Mode Single-chip mode User ROM EW1 Mode Single-chip mode User ROM
Item Operating mode Rewrite control program allocatable area Rewrite control program executable areas
RAM (The rewrite control program must User ROM or RAM be transferred before being executed.) However, the program can be executed in the program ROM area when rewriting the data flash area. User ROM
User ROM However, blocks which contain the rewrite control program are excluded. Software command Read status register command cannot be * Program and block erase commands restrictions executed. cannot be executed to any block which contains the rewrite control program. * Read status register command cannot be executed. Mode after program or block Read array mode Read array mode erase CPU state during The CPU operates. * The CPU operates while the data flash programming and area is being programmed or block block erasure erased. * The CPU is put in a hold state while the program ROM area is being programmed or block erased. (I/O ports retain the state before the command execution). Flash memory Read bits FST7, FMT5, and FMT4 in Read bits FST7, FMT5, and FMT4 in status detection the FST register by a program. the FST register by a program. Conditions for entering * Set bits FMR20 and FMR21 in the * Set bits FMR20 and FMR21 in the FMR2 program-suspend FMR2 register to 1 by a program. register to 1 by a program (while rewriting * Set bits FMR20 and FMR22 in the the data flash area). FMR2 register to 1 and the enabled * Set bits FMR20 and FMR22 in the FMR2 maskable interrupt is generated. register to 1 and the enabled maskable interrupt is generated. CPU clock 20 MHz 20 MHz
Rewritable area
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R8C/32A Group
30. Flash Memory
30.4.1
Flash Memory Status Register (FST)
b6 FST6 0 b5 FST5 0 b4 FST4 0 b3 -- 0 b2 LBDATA X b1 BSYAEI 0 b0 RDYSTI 0 R/W R/W R/W R -- R R R R
Address 01B2h Bit b7 Symbol FST7 After Reset 1 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name RDYSTI Flash ready status interrupt request flag (1) BSYAEI Flash access error interrupt request flag (2) LBDATA LBDATA monitor flag -- FST4 FST5 FST6 FST7
Function 0: No flash ready status interrupt request 1: Flash ready status interrupt request 0: No flash access error interrupt request 1: Flash access error interrupt request 0: Locked 1: Not locked Nothing is assigned. If necessary, set to 0. When read, the content is 0. 0: No program error Program error status flag (3) 1: Program error (3) 0: No erase error Erase error status flag 1: Erase error Erase-suspend status flag 0: Other than erase-suspend 1: During erase-suspend Ready/busy status flag 0: Busy 1: Ready
Notes: 1. The RDYSTI bit cannot be set to 1 (flash ready status interrupt request) by a program. In parallel I/O mode, this bit is fixed to 0 (no flash ready status interrupt request). 2. The BSYAEI bit cannot be set to 1 (flash access error interrupt request) by a program. In parallel I/O mode, this bit is fixed to 0 (no flash access error interrupt request). 3. This bit is also set to 1 (error) when a command error occurs.
RDYSTI Bit (Flash Ready Status Flag Interrupt Request Flag)
When the RDYSTIE bit in the FMR0 register is set to 1 (flash ready status interrupt enabled) and autoprogramming or auto-erasure completes, or erase-suspend mode is entered, the RDYSTI bit is set to 1 (flash ready status interrupt request). During interrupt handling, set the RDYSTI bit to 0 (no flash ready status interrupt request). [Condition for setting to 0] Set to 0 by an interrupt handling program. [Condition for setting to 1] When the flash memory status changes from busy to ready while the RDYSTIE bit in the FRMR0 register is set to 1, the RDYSTI bit is set to 1. The status is changed from busy to ready by the following operations: erasing/writing to the flash memory, suspend acknowledgement, forcible termination, completion of the lock bit program, and completion of the read lock bit status.
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30. Flash Memory
BYSAEI Bit (Flash Access Error Interrupt Request Flag)
The BYSAEI bit is set to 1 (flash access error interrupt request) when the BSYAEIE bit in the FMR0 register is set to 1 (flash access error interrupt enabled) and the block during auto-programming/auto-erasure is accessed. This bit is also set to 1 if an erase or program error occurs when the CMDERIE bit in the FMR0 register is set to 1 (erase/write error interrupt enabled). During interrupt handling, set the BSYAEI bit to 0 (no flash access error interrupt request). [Conditions for setting to 0] (1) Set to 0 by an interrupt handling program. (2) Execute the status clear instruction. [Conditions for setting to 1] (1) Read or write the area that is being erased/written when the BSYAEIE bit in the FRMR0 register is set to 1 and while the flash memory is busy. Or, read the data flash area while erasing/writing to the program ROM area. (Note that the read value is undefined in both cases. Writing has no effect.) (2) If an erase or program error occurs when the CMDERIE bit in the FMR0 register is set to 1 (erase/write error interrupt enabled).
LBDATA Bit (LBDATA Monitor Flag)
This is a read-only bit indicating the lock bit status. To confirm the lock bit status, execute the read lock bit status command and read the LBDATA bit after the FST7 bit is set to 1 (ready). The condition for updating this bit is when the program, erase, read lock bit status commands are generated. When the read lock bit status command is input, the FST7 bit is set to 0 (busy). At the time when the FST7 bit is set to 1 (ready), the lock bit status is stored in the LBDATA bit. The data in the LBDATA bit is retained until the next command is input.
FST4 Bit (Program Error Status Flag)
This is a read-only bit indicating the auto-programming status. The bit is set to 1 if a program error occurs; otherwise, it is set to 0. For details, refer to the description in 30.4.17 Full Status Check.
FST5 Bit (Erase Error Status Flag)
This is a read-only bit indicating the status of auto-programming or the blank check command. The bit is set to 1 if an erase error or blank check error occurs; otherwise, it is set to 0. Refer to 30.4.17 Full Status Check for details.
FST6 Bit (Erase Suspend Status Flag)
This is a read-only bit indicating the suspend status. The bit is set to 1 when an erase-suspend request is acknowledged and a suspend status is entered; otherwise, it is set to 0.
FST7 Bit (Ready/Busy Status Flag)
This is a read-only bit indicating the operating status of the flash memory. The bit is set to 0 during program and erase operations; otherwise, it is set to 1.
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30. Flash Memory
30.4.2
Flash Memory Control Register 0 (FMR0)
b3 FMSTP 0 b2 FMR02 0 b1 FMR01 0 b0 -- 0 R/W R/W R/W R/W R/W
Address 01B4h Bit b7 b6 b5 b4 Symbol RDYSTIE BSYAEIE CMDERIE CMDRST After Reset 0 0 0 0 Bit b0 b1 b2 b3 Symbol -- FMR01 FMR02 FMSTP Bit Name Reserved bit CPU rewrite mode select bit (1)
b4
CMDRST
b5 b6 b7
CMDERIE BSYAEIE RDYSTIE
Function Set to 0. 0: CPU rewrite mode disabled 1: CPU rewrite mode enabled 0: EW0 mode EW1 mode select bit (1) 1: EW1 mode (2) 0: Flash memory operates Flash memory stop bit 1: Flash memory stops (Low-power consumption state, flash memory initialization) When the CMDRST bit is set to 1, the erase/write Erase/write sequence reset bit (3) sequence is reset and erasure/writing can be forcibly stopped. When read, the content is 0. Erase/write error interrupt enable bit 0: Erase/write error interrupt disabled 1: Erase/write error interrupt enabled Flash access error interrupt enable bit 0: Flash access error interrupt disabled 1: Flash access error interrupt enabled Flash ready status interrupt enable bit 0: Flash ready status interrupt disabled 1: Flash ready status interrupt enabled
R/W
R/W R/W R/W
Notes: 1. To set this bit to 1, first write 0 and then 1 immediately. Do not generate an interrupt between writing 0 and writing 1. 2. Write to the FMSTP bit by a program transferred to the RAM. The FMSTP bit is enabled when the FMR01 bit is set to 1 (CPU rewrite mode enabled). To set the FMSTP bit to 1 (flash memory stops), set it when the FST7 bit in the FST register is set to 1 (ready). 3. The CMDRST bit is enabled when the FMR01 bit is set to 1 (CPU rewrite mode enabled) and the FST7 bit in the FST register is set to 0 (busy).
FMR01 Bit (CPU Rewrite Mode Select Bit)
When the FMR01 bit is set to 1 (CPU rewrite mode enabled), the MCU is made ready to accept software commands.
FMR02 Bit (EW1 Mode Select Bit)
When the FMR02 bit is set to 1 (EW1 mode), EW1 mode is selected.
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30. Flash Memory
FMSTP Bit (Flash Memory Stop Bit)
This bit is used to initialize the flash memory control circuits, and also to reduce the amount of current consumed by the flash memory. Access to the flash memory is disabled by setting the FMSTP bit to 1. Write to the FMSTP bit by a program transferred to the RAM. To reduce the power consumption further in high-speed on-chip oscillator mode, low-speed on-chip oscillator mode (XIN clock stopped), and low-speed clock mode (XIN clock stopped), set the FMSTP bit to 1. Refer to 31.2.10 Stopping Flash Memory for details. When entering stop mode or wait mode while CPU rewrite mode is disabled, the FMR0 register does not need to be set because the power for the flash memory is automatically turned off and is turned back on when exiting stop or wait mode.
CMDRST Bit (Erase/Write Sequence Reset Bit)
This bit is used to initialize the flash memory sequence and forcibly stop a program or erase command. The user ROM area can be read while the flash memory sequence is being initialized. For addresses and blocks which the program or erase command is forcibly stopped by the CMDRST bit, execute a block erasure again and ensure it completes normally. The time from when the command is forcibly stopped and until reading is enabled is some hundreds s where the suspend response time is 10 ms.
CMDERIE Bit (Erase/Write Interrupt Enable Bit)
This bit enables an flash command error interrupt to be generated if a program or block erase error occurs. If the CMDERIE bit is set to 1 (erase/write error interrupt enabled) and erasure/writing is performed, an interrupt is generated if an erase or program error occurs. If a flash command error interrupt is generated, execute the clear status register command during interrupt handling.
BSYAEIE Bit (Flash Access Error Interrupt Enable Bit)
This bit enables a flash access error interrupt to be generated if the flash memory during rewriting is accessed.
RDYSTIE Bit (Flash Ready Status Interrupt Enable Bit)
This bit enables a flash ready status error interrupt to be generated when the status of the flash memory sequence changes from the busy to ready status.
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30. Flash Memory
30.4.3
Flash Memory Control Register 1 (FMR1)
b6 FMR16 0 b5 FMR15 0 b4 FMR14 0 b3 FMR13 0 b2 FMR12 0 b1 FMR11 0 b0 FMR10 0 R/W -- -- -- R/W R/W
Address 01B5h Bit b7 Symbol FMR17 After Reset 0 Bit b0 b1 b2 b3 b4
b5
b6
b7
Symbol Bit Name Function FMR10 Nothing is assigned. If necessary, set to 0. When read, the content is 0. FMR11 FMR12 FMR13 Lock bit disable select bit (1) 0: Lock bit enabled 1: Lock bit disabled FMR14 Data flash block A rewrite 0: Rewrite enabled (software command acceptable) 1: Rewrite disabled (software command not acceptable, disable bit (2) no error occurred) 0: Rewrite enabled (software command acceptable) FMR15 Data flash block B rewrite 1: Rewrite disabled (software command not acceptable, disable bit (2) no error occurred) 0: Rewrite enabled (software command acceptable) FMR16 Data flash block C rewrite 1: Rewrite disabled (software command not acceptable, disable bit (2) no error occurred) 0: Rewrite enabled (software command acceptable) FMR17 Data flash block D rewrite 1: Rewrite disabled (software command not acceptable, disable bit (2) no error occurred)
R/W
R/W
R/W
Notes: 1. To set the FMR13 bit to 1, first write 0 and then 1 immediately. Do not generate an interrupt between writing 0 and writing 1. 2. To set this bit to 0, first write 1 and then 0 immediately. Do not generate an interrupt between writing 1 and writing 0.
FMR13 Bit (Lock Bit Disable Select Bit)
When the FMR13 bit is set to 1 (lock bit disabled), the lock bit is disabled. When the FMR13 bit is set to 0, the lock bit is enabled. Refer to 30.4.10 Data Protect Function for the details of the lock bit. The FMR13 bit enables the lock bit function only and the lock bit data does not change. However, when a block erase command is executed while the FMR13 bit is set to 1, the lock bit data set to 0 (locked) changes to 1 (not locked) after erasure completes. [Conditions for setting to 0] The FMR13 bit is set to 0 when one of the following conditions is met. * Completion of the program command * Completion of the erase command * Generation of a command error * If the FMR01 bit in the FMR0 register is set to 0 (CPU rewrite mode disabled). * If the FMSTP bit in the FMR0 register is set to 1 (flash memory stops). * If the CMDRST bit in the FMR0 register is set to 1 (erasure/writing stopped). [Condition for setting to 1] Set to 1 by a program.
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30. Flash Memory
FMR14 Bit (Data Flash Block A Rewrite Disable Bit)
When the FMR 14 bit is set to 0, data flash block A accepts program and block erase commands.
FMR15 Bit (Data Flash Block B Rewrite Disable Bit)
When the FMR 15 bit is set to 0, data flash block B accepts program and block erase commands.
FMR16 Bit (Data Flash Block C Rewrite Disable Bit)
When the FMR 16 bit is set to 0, data flash block C accepts program and block erase commands.
FMR17 Bit (Data Flash Block D Rewrite Disable Bit)
When the FMR 17 bit is set to 0, data flash block D accepts program and block erase commands.
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R8C/32A Group
30. Flash Memory
30.4.4
Flash Memory Control Register 2 (FMR2)
b6 -- 0 b5 -- 0 b4 -- 0 b3 -- 0 b2 FMR22 0 b1 FMR21 0 b0 FMR20 0 R/W R/W R/W R/W -- R/W R/W R/W R/W
Address 01B6h Bit b7 Symbol FMR27 After Reset 0 Bit b0 b1 b2 b3 b4 b5 b6 b7
Symbol Bit Name FMR20 Erase-suspend enable bit (1)
Function 0: Erase-suspend disabled 1: Erase-suspend enabled FMR21 Erase-suspend request bit 0: Erase restart 1: Erase-suspend request 0: Erase-suspend request disabled by interrupt request FMR22 Interrupt request suspend 1: Erase-suspend request enabled by interrupt request request enable bit (1) -- Nothing is assigned. If necessary, set to 0. When read, the content is 0. -- Reserved bits Set to 0. -- -- 0: Low-consumption-current read mode disabled FMR27 Low-consumption-current 1: Low-consumption-current read mode enabled read mode enable bit (1)
Note: 1. To set this bit to 1, first write 0 and then 1 immediately. Do not generate an interrupt between writing 0 and writing 1.
FMR20 Bit (Erase-Suspend Enable Bit)
When the FMR20 bit is set to 1 (enabled), the erase-suspend function is enabled.
FMR21 Bit (Erase-Suspend Request Bit)
When the FMR21 bit is set to 1, erase-suspend mode is entered. If the FMR22 bit is set to 1 (erase-suspend request enabled by interrupt request), the FMR21 bit is automatically set to 1 (erase-suspend request) when an interrupt request for the enabled interrupt is generated, and erase-suspend mode is entered. To restart autoerasure, set the FMR21 bit to 0 (erase restart). [Condition for setting to 0] Set to 0 by a program. [Conditions for setting to 1] * When the FMR22 bit is set to 1 (erase-suspend request enabled by interrupt request) at the time an interrupt is generated. * Set to 1 by a program.
FMR22 Bit (Interrupt Request Suspend-Request Enable Bit)
When the FMR 22 bit is set to 1 (erase-suspend request enabled by interrupt request), the FMR21 bit is automatically set to 1 (erase-suspend request) at the time an interrupt request is generated during auto-erasure. Set the FMR22 bit to 1 when using erase-suspend while rewriting the user ROM area in EW1 mode.
FMR27 Bit (Low-Power-Current Read Mode Enable Bit)
When the FMR 27 bit is set to 1 (low-consumption-current read mode enabled) in low-speed clock mode (XIN clock stopped) or low-speed on-chip oscillator mode (XIN clock stopped), power consumption when reading the flash memory can be reduced. Refer to 31.2.11 Low-Current-Consumption Read Mode for details.
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30. Flash Memory
30.4.5
EW0 Mode
When the FMR01 bit in the FMR0 register is set to 1 (CPU rewrite mode enabled), the MCU enters CPU rewrite mode and software commands can be accepted. At this time, the FMR02 bit in the FMR0 register is set to 0 so that EW0 mode is selected. Software commands are used to control program and erase operations. The FST register or the status register can be used to confirm whether programming or erasure has completed. To enter erase-suspend during auto-erasure, set the FMR20 bit to 1 (erase-suspend enabled) and the FMR21 bit to 1 (erase-suspend request). Wait for td(SR-SUS) and ensure that the FST6 bit in the FST register is set to 1 (during erase-suspend) before accessing the flash memory. Auto-erasure can be restarted by setting the FMR21 bit in the FMR2 register to 0 (erase restart).
30.4.6
EW1 Mode
After the FMR01 bit in the FMR0 register is set to 1 (CPU rewrite mode enabled), EW1 mode is selected by setting the FMR02 bit is set to 1. The FST register can be used to confirm whether programming and erasure has completed. Do not execute the read status register command in EW1 mode. To enable the erase-suspend function during auto-erasure, execute the block erase command after setting the FMR20 bit in the FMR2 register to 1 (suspend enabled). To enter erase-suspend while auto-erasing the user ROM area, set the FMR22 bit in the FMR2 register to 1 (erase-suspend request enabled by interrupt request). Also, the interrupt to enter program-suspend must be enabled beforehand. When an interrupt request is generated, the FMR21 bit in the FMR2 register is automatically set to 1 (erasesuspend request) and auto-erasure suspends after td(SR-SUS). After interrupt handling completes, set the FMR21 bit to 0 (erase restart) to restart auto-erasure.
30.4.7
Suspend Operation
Figure 30.2 shows the Suspend Operation Timing.
Data ROM
Erase
Suspend (readable)
Data read
Suspend (readable)
Program
Suspend (readable)
Erase
User ROM
User program
Command issue
User program
Set FMR21 bit to 1
User program
Flash ready interrupt handling
Command issue
User program
Flash ready Set interrupt FMR21 handling bit to 0
User program
Flash ready interrupt handling
User program
FMR21 bit in FMR2 register FST7 bit in FST register FST6 bit in FST register RDYSTI bit in FST register
td(SR-SUS)
1 is set automatically.
1 is set automatically.
1 is set automatically.
Set to 0 by a program.
Set to 0 by a program.
Set to 0 by a program.
Figure 30.2
Suspend Operation Timing
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30. Flash Memory
30.4.8
How to Set and Exit Each Mode
Figure 30.3 shows How to Set and Exit EW0 Mode and Figure 30.4 shows How to Set and Exit EW0 Mode (When Rewriting Data Flash) and EW1 Mode.
EW0 Mode Execution Procedure (When Rewriting User ROM)
Rewrite control program After writing 0 to the FMR01 bit, write 1 (CPU rewrite mode enabled) (1)
Transfer the rewrite mode program that uses CPU rewrite mode to the RAM
Execute software commands
Jump to the rewrite control program transferred to the RAM (The subsequent process is executed by the rewrite control program in the RAM)
Write 0 (CPU rewrite mode disabled) to the FMR01 bit
Jump to the specified address in the flash memory
FMR01: Bit in FMR0 register Note: To set the FMR01 bit to 1, first write 0 and then 1 immediately. Do not generate an interrupt between writing 0 and writing 1. Writing to the FMR01 bit must be performed in the RAM.
Figure 30.3
How to Set and Exit EW0 Mode
EW0 Mode Execution Procedure (When Rewriting Data Flash) EW1 Mode Execution Procedure
Program in ROM
After writing 0 to the FMR01 bit, write 1 (CPU rewrite mode enabled) (1)
After writing 0 to the FMR02 bit, write 1 (EW1 mode) (2)
Execute software commands
Write 0 (CPU rewrite mode disabled) to the FMR01 bit
FMR01, FMR02: Bits in FMR0 register Notes: 1. To set the FMR01 bit to 1, first write 0 and then 1 immediately. Do not generate an interrupt between writing 0 and writing 1. 2. Not required when rewriting the data flash in EW0 mode.
Figure 30.4
How to Set and Exit EW0 Mode (When Rewriting Data Flash) and EW1 Mode Apr 01, 2008
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30. Flash Memory
30.4.9
BGO (BackGround Operation) Function
When the program ROM area is specified while a program or block erase operation to the data flash, array data can be read. This eliminates the need for writing software commands. Access time is the same as for normal read operations. Figure 30.5 shows the BGO Function.
Time
Data flash
Erase/program
Program ROM
Read
Read
Read
Read
Figure 30.5
BGO Function
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30. Flash Memory
30.4.10 Data Protect Function
Each block in the flash memory has a nonvolatile lock bit. The lock bit is enabled by setting the FMR13 bit in the FMR1 register is set to 0 (lock bit enabled). The lock bit can be used to disable (lock) programming or erasing each block. This prevents data from being written or erased inadvertently. A block status changes according to the lock bit as follows:
* When the lock bit data is set to 0: locked (the block cannot be programmed or erased) * When the lock bit data is set to 1: not locked (the block can be programmed and erased)
The lock bit data is set to 0 (locked) by executing the lock bit program command and to 1 (not locked) by erasing the block. No commands can be used to set only the lock bit data to 1. The lock bit data can be read using the read lock bit status command. When the FMR13 bit is set to 1 (lock bit disabled), the lock bit function is disabled and all blocks are not locked (each lock bit data remains unchanged). The lock bit function is enabled by setting the FMR13 bit to 0 (the lock bit data is retained). When the block erase command is executed while the FMR13 bit is set to 1, the target block is erased regardless of the lock bit status. The lock bit of the erase target block is set to 1 after auto-erasure completes. Refer to 30.4.11 Software Commands for the details of individual commands. The FMR13 bit is set to 0 after auto-erasure completes. This bit is also set to 0 if one of the following conditions is met. To erase or program a different locked block, set the FMR 13 bit to 1 again and execute the block erase or program command.
* If the FST7 bit in the FST register is changed from 0 (busy) to 1 (ready). * If an incorrect command is input. * If the FMR01 bit in the FMR0 register is set to 0 (CPU mode disabled). * If the FMSTP bit in the FM0 register is set to 1 (flash memory stops).
Figure 30.6 shows the FMR13 Bit Operation Timing.
Erase start Operation FST7 bit (Ready/busy status flag) FMR13 bit (Lock bit disable select bit) 1 0 Erase
Erase completion
0 is set at the rising edge of the FST7 bit. 1 0 Set to 1 by a program. Lock bit enabled FST7: Bit in FST register FMR13: Bit in FMR1 register
Figure 30.6
FMR13 Bit Operation Timing
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30. Flash Memory
30.4.11 Software Commands
The software commands are described below. Read or write commands and data in 8-bit units. Table 30.4 Software Commands Mode Write Write Write Write Write Write Write Write First Bus Cycle Address x x x WA x BT x x Data FFh 70h 50h 40h 20h 77h 71h 25h Mode Read Write Write Write Write Write Second Bus Cycle Address Data x WA BA BT BT BA SRD WD D0h D0h D0h D0h
Command Read array Read status register Clear status register Program Block erase Lock bit program Read lock bit status Block blank check
SRD: Status register data WA: Write address WD: Write data BA: Any block address BT: Starting block address x: Any address in the user ROM area
30.4.11.1 Read Array Command
The read array command is used to read the flash memory. When FFh is written in the first bus cycle, the MCU enters read array mode. When the read address is input in the following bus cycles, the content of the specified address can be read in 8-bit units. Since read array mode remains until another command is written, the contents of multiple addresses can be read continuously. In addition, the MCU enters read array mode after a reset.
30.4.11.2 Read Status Register Command
The read status register command is used to read the status register. When 70h is written in the first bus cycle, the status register can be read in the second bus cycle. When reading the status register, read the same address as the address value in the first bus cycle. In CPU rewrite mode, do not execute this command. Read status register mode remains until the next read array command is written.
30.4.11.3 Clear Status Register Command
The clear status register command is used to set the status register to 0. When 50h is written in the first bus cycle, bits FST4 and FST5 in the FST register and bits SR4 and SR5 in the status register are set to 0. If the clear status register is input in read array mode, the MCU enters read array mode after the status register is set to 0.
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30. Flash Memory
30.4.11.4 Program Command
The program command is used to write data to the flash memory in 1-byte units. When 40h is written in the first bus cycle and data is written in the second bus cycle to the write address, autoprogramming (data program and verify operation) starts. Make sure the address value specified in the first bus cycle is the same address as the write address specified in the second bus cycle. The FST7 bit in the FST register can be used to confirm whether auto-programming has completed. The FST7 bit is set to 0 during auto-programming and is set to 1 when auto-programming completes. After auto-programming has completed, the auto-program result can be confirmed by the FST4 bit in the FST register (refer to 30.4.17 Full Status Check). Do not write additions to the already programmed addresses. The program command targeting each block in the program ROM can be disabled using the lock bit. The following commands are not accepted under the following conditions: * Block erase commands targeting data flash block A when the FMR14 bit in the FMR1 register is set to 1 (rewrite disabled). * Block erase commands targeting data flash block B when the FMR15 bit is set to 1 (rewrite disabled). * Block erase commands targeting data flash block C when the FMR16 bit is set to 1 (rewrite disabled). * Block erase commands targeting data flash block D when the FMR17 bit is set to 1 (rewrite disabled). Figure 30.7 shows a Program Flowchart (Flash Ready Status Interrupt Disabled) and Figure 30.8 shows a Program Flowchart (Flash Ready Status Interrupt Enabled). In EW1 mode, do not execute this command to any address where a rewrite control program is allocated. When RDYSTIE bit in the FMR0 register is set to 1 (flash ready status interrupt enabled), a flash ready status interrupt can be generated upon completion of auto-programming. The auto-program result can be confirmed by reading the FST register during the interrupt routine.
Start
Write the command code 40h
Write data to the write address
FST7 = 1?
No
Yes Full status check
Program completed
FST7: Bit in FST register
Figure 30.7
Program Flowchart (Flash Ready Status Interrupt Disabled)
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30. Flash Memory
Start
Flash ready status interrupt
RDYSTIE = 1 Status check
Write the command code 40h
RDYSTI = 0
I = 1 (interrupt enabled)
REIT
Write data to the write address
Program completed
RDYSTI: Bit in FST register RDYSTIE: Bit in FMR0 register
Figure 30.8
Program Flowchart (Flash Ready Status Interrupt Enabled)
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30. Flash Memory
30.4.11.5 Block Erase Command
When 20h is written in the first bus cycle and then D0h is written in the second bus cycle to any block address, auto-erasure (erase and erase verify operation) starts in the specified block. The FST7 bit in the FST register can be used to confirm whether auto-erasure has completed. The FST7 bit is set to 0 during auto-erasure and is set to 1 when auto-erasure completes. After auto-erasure has completed, the auto-erase result can be confirmed by the FST5 bit in the FST register. (Refer to 30.4.17 Full Status Check). The block erase command targeting each block in the program ROM can be disabled using the lock bit. The following commands are not accepted under the following conditions: * Block erase commands targeting data flash block A when the FMR14 bit in the FMR1 register is set to 1 (rewrite disabled). * Block erase commands targeting data flash block B when the FMR15 bit is set to 1 (rewrite disabled). * Block erase commands targeting data flash block C when the FMR16 bit is set to 1 (rewrite disabled). * Block erase commands targeting data flash block D when the FMR17 bit is set to 1 (rewrite disabled). Figure 30.9 shows a Block Erase Flowchart (Flash Ready Status Interrupt Disabled), Figure 30.10 shows a Block Erase Flowchart (Flash Ready Status Interrupt Disabled and Suspend Enabled), and Figure 30.11 shows a Block Erase Flowchart (Flash Ready Status Interrupt Enabled and Suspend Enabled). In EW1 mode, do not execute this command to any block where a rewrite control program is allocated. While the RDYSTIE bit in the FMR0 register is set to 1 (flash ready status interrupt enabled), a flash ready status interrupt can be generated upon completion of auto-erasure. While the RDYSTIE bit is set to 1 and the FMR20 bit in the FMR2 register is set to 1 (erase-suspend enabled), a flash ready status interrupt is generated when the FMR21 bit is set to 1 (erase-suspend request) and auto-erasure suspends. The auto-erase result can be confirmed by reading the FST register during the interrupt routine.
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30. Flash Memory
Start
Write the command code 20h
Write D0h to any block address
FST7 = 1?
No
Yes Full status check
Block erase completed
FST7: Bit in FST register
Figure 30.9
Block Erase Flowchart (Flash Ready Status Interrupt Disabled)
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30. Flash Memory
Start
Maskable interrupt (1)
FMR20 = 1
FMR21 = 1 (2)
Write the command code 20h
FST6 = 1? Yes Access the flash memory
No
I = 1 (interrupt enabled)
Write D0h to any block address
FMR21 = 0
FST7 = 1?
No
REIT
Yes Full status check
I: Flag in CPU register FST6, FST7: Bits in FST register FMR20, FMR21: Bits in FMR2 register
Block erase completed
Notes: 1. The interrupt vector table and interrupt routine for interrupts to be used must be allocated to an area other the erase target area. 2. td(SR-SUS) is required until suspend is acknowledged after the FMR21 bit is set to 1. The interrupt to enter suspend must be enabled beforehand.
Figure 30.10
Block Erase Flowchart (Flash Ready Status Interrupt Disabled and Suspend Enabled)
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30. Flash Memory
Start
Maskable interrupt (1)
RDYSTIE = 1
FMR21 = 1 (2)
FMR20 = 1
REIT
Write the command code 20h
I = 1 (interrupt enabled)
Write D0h to any block address
Block erase completed
Flash ready status interrupt (1, 3)
FST6 = 1? Yes Access the flash memory
No
Full status check
FMR21 = 0
RDYSTI = 0
I: Flag in CPU register RDYSTI, FST6: Bits in FST register RDYSTIE: Bit in FMR0 register FMR20, FMR21: Bits in FMR2 register
REIT
Notes: 1. The interrupt vector table and interrupt routine for interrupts to be used must be allocated to an area other the erase target area. 2. td(SR-SUS) is required until suspend is acknowledged after the FMR21 bit is set to 1. The interrupt to enter suspend must be enabled beforehand. 3. When auto-erasure suspends, a flash ready status interrupt is generated.
Figure 30.11
Block Erase Flowchart (Flash Ready Status Interrupt Enabled and Suspend Enabled)
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30. Flash Memory
30.4.11.6 Lock Bit Program Command
This command is used to set the lock bit of any block in the program ROM area to 0 (locked). When 77h is written in the first bus cycle and D0h is written in the second bus cycle to the starting block address, 0 is written to the lock bit of the specified block. Make sure the address value in the first bus cycle is the same address as the starting block address specified in the second bus cycle. Figure 30.12 shows a Lock Bit Program Flowchart. The lock bit status (lock bit data) can be read using the read lock bit status command. The FST7 bit in the FST register can be used to confirm whether writing to the lock bit has completed. Refer to 30.4.10 Data Protect Function for the lock bit function and how to set the lock bit to 1 (not locked).
Start
Write the command code 77h
Write D0h to the starting block address
FST7 = 1?
No
Yes Full status check
Completed
FST7: Bit in FST register
Figure 30.12
Lock Bit Program Flowchart
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30. Flash Memory
30.4.11.7 Read Lock Bit Status Command
This command is used to read the lock bit status of any address in the program ROM area. When 71h written in the first bus cycle and D0h is written in the second cycle to the starting block address, the lock bit status of the specified block is stored in the LBDATA bit in the FST register. After the FST7 bit in the FST register has been set to 1 (ready), read the LBDATA bit. Figure 30.13 shows a Read Lock Bit Status Flowchart.
Start
Write the command code 71h
Write D0h to the starting block address
FST7 = 1? Yes
No
No LBDATA = 1? Yes Block not locked Block locked
LBDATA, FST7: Bits in FST register
Figure 30.13
Read Lock Bit Status Flowchart
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30. Flash Memory
30.4.11.8 Block Blank Check Command
This command is used to confirm that all addresses in any block are blank data FFh. When 25h is written in the first bus cycle and D0h is written in the second bus cycle to any block address, blank checking starts in the specified block. The FST7 bit in the FST register can be used to confirm whether blank checking has completed. The FST7 bit is set to 0 during the blank-check period and set to 1 when blank checking completes. After blank checking has completed, the blank-check result can be confirmed by the FST5 bit in the FST register. (Refer to 30.4.17 Full Status Check.). Figure 30.14 shows a Block Blank Check Flowchart.
Start
Write the command code 25h
Write D0h to the starting block address
FST7 = 1? Yes
No
No FST5 = 0? Yes Blank Not blank
FST5, FST7: Bits in FST register
Figure 30.14
Block Blank Check Flowchart
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30. Flash Memory
30.4.12 Status Register
The status register indicates the operating status of the flash memory and whether erasure or programming has completed normally or terminated in error. The status of the status register can be read by the FST register.
30.4.13 Sequence Status
The clear sequence status bit indicates the operating status of the flash memory. This bit is set to 0 (busy) during auto-programming and auto-erasure. It is set to 1 (ready) when these operations complete.
30.4.14 Erase Status
Refer to 30.4.17 Full Status Check.
30.4.15 Program Status
Refer to 30.4.17 Full Status Check.
30.4.16 Suspend Status
The suspend status bit indicates the suspend status of the flash memory commands. This bit is set to 1 (during erase-suspend) while auto-erasure suspends and set to 0 (other than erase-suspend) when auto-erasure restarts. Table 30.5 lists the Status Register. Table 30.5 Status Register FST Register Bit - - - - FST4 FST5 FST6 FST7 Status Name Reserved Reserved Reserved Reserved Program status Erase status/ blank check Suspend status Sequencer status Content 0 - - - - Completed normally Completed normally Other than erase-suspend Busy 1 - - - - Terminated in error Terminated in error During erase-suspend Ready Value After Reset - - - - 0 0 0 1
Status Register Bit SR0 (D0) SR1 (D1) SR2 (D2) SR3 (D3) SR4 (D4) SR5 (D5) SR6 (D6) SR7 (D7)
D0 to D7: Indicate the data bus which is read when the read status register command is executed. Bits FST4 (SR4) and FST5 (SR5) are set to 0 by executing the clear status command. When the FST4 bit (SR4) or FST5 bit (SR5) is set to 1, the program and block erase commands cannot be accepted.
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30. Flash Memory
30.4.17 Full Status Check
If an error occurs, bits FST4 and FST5 in the FST register are set to 1, indicating the occurrence of an error. The execution result can be confirmed by checking these status bits (full status check). Table 30.6 lists the Errors and FST Register Status. Figure 30.15 shows the Full Status Check and Handling Procedure for Individual Errors. Table 30.6 Errors and FST Register Status Error Occurrence Condition
FST Register (Status Register) Status Error FST5 (SR5) FST4 (SR4) 1 1 Command sequence error
1
0
0
1
* When a command is not written correctly. * When data other than valid data (i.e., D0h or FFh) is written in the second bus cycle of the block erase command (1). Erase error When the block erase command is executed, but autoerasure does not complete correctly. Blank check error When the blank check command is executed and data other than blank data FFh is read. Program error When the program command is executed, but autoprogramming does not complete correctly.
Note: 1. When FFh is written in the second bus cycle of these commands, the MCU enters read array mode. At the same time, the command code written in the first bus cycle is invalid.
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30. Flash Memory
Command sequence error
Execute the clear status register command (Set the status flags to 0)
Check if the command is properly input
Full status check
Re-execute the command
FST4 = 1 and FST5 = 1? No
Yes
Command sequence error
Erase error/ blank check error
Execute the clear status register command (Set the status flags to 0)
FST5 = 1? No
Yes
Erase error/ blank check error
Is the lock bit disabled? or Is the command executed on the data flash area?
No
Set FMR13 bit to 1
Yes Erase command Re-execution times 3 times? Yes FST4 = 1? No Yes Program error Re-execute the block erase command No The erasure target block cannot be used
Program error
Execute the clear status register command (Set the status flags to 0) Full status check completed
Is the lock bit disabled? or Is the command executed on the data flash area?
No
Set FMR13 bit to 1
Yes Specify an address other than the write address where the error occurs (1) as the program address Note: 1. To rewrite to the address where the program error occurs, ensure that the full status check completes normally and write to the address after the block erase command is executed.
Re-execute the program command
FST4, FST5: Bits in FST register FMR13: Bits in FMR1 register
Figure 30.15
Full Status Check and Handling Procedure for Individual Errors
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30. Flash Memory
30.5
Standard Serial I/O Mode
In standard serial I/O mode, a serial programmer which supports the MCU can be used to rewrite the user ROM area while the MCU is mounted on-board. There are three types of standard serial I/O modes: * Standard serial I/O mode 1 .................Clock synchronous serial I/O used to connect to a serial programmer * Standard serial I/O mode 2 .................Clock asynchronous serial I/O used to connect to a serial programmer * Standard serial I/O mode 3 .................Special clock asynchronous serial I/O used to connect to a serial programmer Standard serial I/O mode 2 and standard serial I/O mode 3 can be used for the MCU. Refer to Appendix 2. Connection Examples between Serial Writer and On-Chip Debugging Emulator for examples of connecting to a serial programmer. Contact the serial programmer manufacturer for more information. Refer to the user's manual included with your serial programmer for instructions. Table 30.7 lists the Pin Functions (Flash Memory Standard Serial I/O Mode 2) and Figure 30.16 shows Pin Handling in Standard Serial I/O Mode 2. Table 30.8 lists the Pin Functions (Flash Memory Standard Serial I/O Mode 3) and Figure 30.17 shows Pin Handling in Standard Serial I/O Mode 3. After handling the pins shown in Table 30.8 and rewriting the flash memory using the programmer, apply a "H" level signal to the MODE pin and reset the hardware to run a program in the flash memory in single-chip mode.
30.5.1
ID Code Check Function
The ID code check function determines whether the ID codes sent from the serial programmer and those written in the flash memory match. Refer to 12. ID Code Areas for details of the ID code check.
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30. Flash Memory
Table 30.7 Pin VCC, VSS
Pin Functions (Flash Memory Standard Serial I/O Mode 2) Name Power supply input Reset input I/O Description Apply the guaranteed programming and erasure voltage to the VCC pin and 0 V to the VSS pin. Reset input pin
RESET P4_6/XIN/(XCIN) P4_7/XOUT/(XCOUT) P1_0 to P1_3, P1_6, P1_7 P3_3 to P3_5, P3_7 P4_2/VREF, P4_5 MODE P1_4 P1_5
I
P4_6 input/clock input I Connect a ceramic resonator or crystal oscillator P4_7 input/clock output I/O between pins XIN(XCIN) and XOUT(XCOUT). Input port P1 I Input a "H" or "L" level signal or leave open. Input port P3 Input port P4 MODE TXD output RXD input I I I/O O I Input a "H" or "L" level signal or leave open. Input a "H" or "L" level signal or leave open. Input a "L" level signal. Serial data output pin Serial data input pin
MCU
Data output
TXD
VCC AVCC
Data input
RXD
MODE User reset signal RESET
VSS XIN/ (XCIN ) AVSS XOUT/ (XCOUT)
Connect an oscillator (2) Notes: 1. In this example, modes are switched between single-chip mode and standard serial I/O mode by controlling the MODE input with a switch. 2. Always connect an oscillator. Set the main clock frequency to 1 MHz to 20 MHz. Refer to Appendix Figure 2.1 Connection Example with M16C Flash Starter (M3A-0806).
Figure 30.16
Pin Handling in Standard Serial I/O Mode 2
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30. Flash Memory
Table 30.8 Pin VCC, VSS
Pin Functions (Flash Memory Standard Serial I/O Mode 3) Name Power supply input Reset input P4_6 input/clock input I/O Description Apply the guaranteed programming and erasure voltage to the VCC pin and 0 V to the VSS pin. Reset input pin
If an external oscillator is connected, connect a ceramic resonator or crystal oscillator between pins XIN(XCIN) and XOUT(XCOUT). P4_7/XOUT/(XCOUT) P4_7 input/clock output I/O To use as an input port, input a "H" or "L" level signal or leave the pin open. P1_0 to P1_7 P3_3 to P3_5, P3_7 P4_2/VREF, P4_5 MODE Input port P1 Input port P3 Input port P4 MODE I I I I/O Input a "H" or "L" level signal or leave open. Input a "H" or "L" level signal or leave open. Input a "H" or "L" level signal or leave open. Serial data I/O pin. Connect the pin to a programmer.
RESET P4_6/XIN/(XCIN)
I I
MCU
MODE I/O MODE VCC AVCC
Reset input
RESET
User reset signal VSS AVSS
Notes: 1. Controlled pins and external circuits vary depending on the programmer. Refer to the programmer manual for details. 2. In this example, modes are switched between single-chip mode and standard serial I/O mode by connecting a programmer. 3. When operating with the on-chip oscillator clock, it is not necessary to connect an oscillation circuit.
Figure 30.17
Pin Handling in Standard Serial I/O Mode 3
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30. Flash Memory
30.6
Parallel I/O Mode
Parallel I/O mode is used to input and output software commands, addresses and data necessary to control (read, program, and erase) the on-chip flash memory. Use a parallel programmer which supports the MCU. Contact the parallel programmer manufacturer for more information. Refer to the user's manual included with your parallel programmer for instructions. In parallel I/O mode, the user ROM areas shown in Figure 30.1 can be rewritten.
30.6.1
ROM Code Protect Function
The ROM code protect function prevents the flash memory from being read and rewritten. (Refer to the 30.3.2 ROM Code Protect Function.)
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30. Flash Memory
30.7 30.7.1
Notes on Flash Memory CPU Rewrite Mode Prohibited Instructions
30.7.1.1
The following instructions cannot be used while the program ROM area is being rewritten in EW0 mode because they reference data in the flash memory: UND, INTO, and BRK.
30.7.1.2
Table 30.9
Mode EW0 Erase/ Write Target Data flash
Non-Maskable Interrupts
CPU Rewrite Mode Interrupts (1)
Status During auto-erasure (suspend enabled) Maskable Interrupt * Address Match * Address Break (Note 1)
Tables 30.9 and 30.10 show CPU Rewrite Mode Interrupts (1) and (2), respectively.
When an interrupt request is acknowledged, interrupt handling is executed. If the FMR22 bit is set to 1 (erase-suspend request enabled by interrupt request), the FMR21 bit is automatically set to 1 (erase-suspend request). The flash memory suspends auto-erasure after td(SR-SUS). If erase-suspend is required while the FMR22 bit is set to 0 (erase-suspend request disabled by interrupt request), set the FMR 21 bit to 1 during interrupt handling. The flash memory suspends auto-erasure after td(SR-SUS). While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure can be restarted by setting the FMR21 bit to 0 (erase restart). Interrupt handling is executed while auto-erasure or auto-programming is being performed.
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming Program During auto-erasure ROM (suspend enabled) During auto-erasure (suspend disabled) During auto-programming EW1 Data flash During auto-erasure (suspend enabled)
Usable by allocating a vector in RAM.
Not usable during auto-erasure or auto-programming.
When an interrupt request is acknowledged, interrupt handling is executed. If the FMR22 bit is set to 1, the FMR21 bit is automatically set to 1. The flash memory suspends auto-erasure after td(SR-SUS). If erase-suspend is required while the FMR22 bit is set to 0, set the FMR 21 bit to 1 during interrupt handling. The flash memory suspends auto-erasure after td(SR-SUS). While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure can be restarted by setting the FMR21 bit to 0. Interrupt handling is executed while auto-erasure or auto-programming is being performed.
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming Program During auto-erasure ROM (suspend enabled)
Auto-erasure suspends after td(SR-SUS) and interrupt handling is executed. Autoerasure can be restarted by setting the FMR21 bit to 0 after interrupt handling completes. While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure and auto-programming have priority and interrupt requests are put on standby. Interrupt handling is executed after auto-erase and auto-program complete.
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming
FMR21, FMR22: Bits in FMR2 register Note: 1. Do not use a non-maskable interrupt while block 0 is being auto-erased because the fixed vector is allocated in block 0.
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R8C/32A Group
30. Flash Memory
Table 30.10
Erase/ Write Target
CPU Rewrite Mode Interrupts (2)
* * * * * Watchdog Timer Oscillation Stop Detection Voltage Monitor 2 Voltage Monitor 1 NMI * * * * Undefined Instruction INTO Instruction BRK Instruction Single Step
Mode
Status
(Note 1)
(Note 1)
EW0
Data flash During auto-erasure (suspend enabled)
When an interrupt request is acknowledged, interrupt handling is executed. If the FMR22 bit is set to 1 (erase-suspend request enabled by interrupt request), the FMR21 bit is automatically set to 1 (erase-suspend request). The flash memory suspends auto-erasure after td(SR-SUS). If erase-suspend is required while the FMR22 bit is set to 0 (erase-suspend request disabled by interrupt request), set the FMR 21 bit to 1 during interrupt handling. The flash memory suspends auto-erasure after td(SR-SUS). While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure can be restarted by setting the FMR21 bit is set to 0 (erase restart). Interrupt handling is executed while auto-erasure or auto-programming is being performed.
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming Program ROM During auto-erasure (suspend enabled) During auto-erasure (suspend disabled) During auto-programming
Not usable during auto-erasure or When an interrupt request is acknowledged, auto-programming. auto-erasure or auto-programming is forcibly stopped immediately and the flash memory is reset. Interrupt handling starts when the flash memory restarts after the fixed period. Since the block during auto-erasure or the address during auto-programming is forcibly stopped, the normal value may not be read. After the flash memory restarts, execute auto-erasure again and ensure it completes normally. The watchdog timer does not stop during the command operation, so interrupt requests may be generated. Initialize the watchdog timer regularly using the erase-suspend function. When an interrupt request is acknowledged, interrupt handling is executed. If the FMR22 bit is set to 1, the FMR21 bit is automatically set to 1. The flash memory suspends auto-erasure after td(SR-SUS). If erase-suspend is required while the FMR22 bit is set to 0, set the FMR 21 bit to 1 during interrupt handling. The flash memory suspends auto-programming after td(SRSUS). While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure can be restarted by setting the FMR21 bit is set to 0. Interrupt handling is executed while auto-erasure or auto-programming is being performed.
EW1
Data flash During auto-erasure (suspend enabled)
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming Program ROM During auto-erasure (suspend enabled)
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming
Not usable during auto-erasure or When an interrupt request is acknowledged, auto-programming. auto-erasure or auto-programming is forcibly stopped immediately and the flash memory is reset. Interrupt handling starts when the flash memory restarts after the fixed period. Since the block during auto-erasure or the address during auto-programming is forcibly stopped, the normal value may not be read. After the flash memory restarts, execute auto-erasure again and ensure it completes normally. The watchdog timer does not stop during the command operation, so interrupt requests may be generated. Initialize the watchdog timer regularly using the erase-suspend function.
FMR21, FMR22: Bits in FMR2 register Note: 1. Do not use a non-maskable interrupt while block 0 is being auto-erased because the fixed vector is allocated in block 0.
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30. Flash Memory
30.7.1.3
How to Access
To set one of the following bits to 1, first write 0 and then 1 immediately. Do not generate an interrupt between writing 0 and writing 1. * The FMR01 bit or FMR02 bit in the FMR0 register * The FMR13 bit in the FMR1 register * The FMR20 bit, FMR22 bit, or FMR 27 bit in the FMR2 register To set one of the following bits to 0, first write 1 and then 0 immediately. Do not generate an interrupt between writing 1 and writing 0. * The FMR14 bit, FMR15 bit, FMR16 bit, or FMR17 bit in the FMR1 register
30.7.1.4
Rewriting User ROM Area
In EW0 Mode, if the supply voltage drops while rewriting any block in which a rewrite control program is stored, it may not be possible to rewrite the flash memory because the rewrite control program cannot be rewritten correctly. In this case, use standard serial I/O mode.
30.7.1.5
Programming
Do not write additions to the already programmed address.
30.7.1.6
Entering Stop Mode or Wait Mode
Do not enter stop mode or wait mode during erase-suspend. If the FST7 in the FST register is set to 0 (busy (during programming or erasure execution), do not enter to stop mode or wait mode.
30.7.1.7
Programming and Erasure Voltage for Flash Memory
To perform programming and erasure, use VCC = 2.7 V to 5.5 V as the supply voltage. Do not perform programming and erasure at less than 2.7 V.
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R8C/32A Group
31. Reducing Power Consumption
31. Reducing Power Consumption
31.1 Overview
This chapter describes key points and processing methods for reducing power consumption.
31.2
Key Points and Processing Methods for Reducing Power Consumption
Key points for reducing power consumption are shown below. They should be referred to when designing a system or creating a program.
31.2.1
Voltage Detection Circuit
If voltage monitor 1 and comparator A1 are not used, set the VCA26 bit in the VCA2 register to 0 (voltage detection 1 circuit disabled). If voltage monitor 2 and comparator A2 are not used, set the VCA27 bit in the VCA2 register to 0 (voltage detection 2 circuit disabled). If the power-on reset and voltage monitor 0 reset are not used, set the VCA25 bit in the VCA2 register to 0 (voltage detection 0 circuit disabled).
31.2.2
Ports
Even after the MCU enters wait mode or stop mode, the states of the I/O ports are retained. Current flows into the output ports in the active state, and shoot-through current flows into the input ports in the high-impedance state. Unnecessary ports should be set to input and fixed to a stable electric potential before the MCU enters wait mode or stop mode.
31.2.3
Clocks
Power consumption generally depends on the number of the operating clocks and their frequencies. The fewer the number of operating clocks or the lower their frequencies, the more power consumption decreases. Unnecessary clocks should be stopped accordingly. Stopping low-speed on-chip oscillator oscillation: CM14 bit in CM1 register Stopping high-speed on-chip oscillator oscillation: FRA00 bit in FRA0 register
31.2.4
Wait Mode, Stop Mode
Power consumption can be reduced in wait mode and stop mode. Refer to 9.7 Power Control for details.
31.2.5
Stopping Peripheral Function Clocks
If the peripheral function f1, f2, f4, f8, and f32 clocks are not necessary in wait mode, set the CM02 bit in the CM0 register to 1 (peripheral function clock stops in wait mode). This will stop the f1, f2, f4, f8, and f32 clocks in wait mode.
31.2.6
Timers
If timer RA is not used, set the TCKCUT bit in the TRAMR register to 1 (count source cutoff). If timer RB is not used, set the TCKCUT bit in the TRBMR register to 1 (count source cutoff). If timer RC is not used, set the MSTTRC bit in the MSTCR register to 1 (standby).
31.2.7
A/D Converter
When the A/D converter is not used, power consumption can be reduced by setting the ADSTBY bit in the ADCON1 register to 0 (A/D operation stops (standby)) to shut off any analog circuit current flow.
31.2.8
Clock Synchronous Serial Interface
When the SSU or the I2C bus is not used, set the MSTIIC bit in the MSTCR register to 1 (standby).
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31. Reducing Power Consumption
31.2.9
Reducing Internal Power Consumption
When the MCU enters wait mode using low-speed clock mode or low-speed on-chip oscillator mode, internal power consumption can be reduced by using the VCA20 bit in the VCA2 register. Figure 31.1 shows the Handling Procedure for Reducing Internal Power Consumption Using VCA20 Bit. To enable reduced internal power consumption by the VCA20 bit, follow Figure 31.1 Handling Procedure for Reducing Internal Power Consumption Using VCA20 Bit.
Exit wait mode by interrupt Procedure for enabling reduced internal power consumption using VCA20 bit
(Note 1)
In interrupt routine
Step (1)
Enter low-speed clock mode or low-speed on-chip oscillator mode
Step (5)
VCA20 0 (internal power low consumption disabled) (2) (This is automatically set when exiting wait mode)
Step (2)
Stop XIN clock and high-speed on-chip oscillator clock
Step (6)
Start XIN clock or high-speed on-chip oscillator clock
Step (3)
VCA20 1 (internal power low consumption enabled) (2, 3)
Step (7)
(Wait until XIN clock or high-speed on-chip oscillator clock oscillation stabilizes)
If it is necessary to start the high-speed clock or high-speed on-chip oscillator during the interrupt routine, execute steps (6) to (7) in the routine.
Step (4)
Enter wait mode (4)
Step (8)
Enter high-speed clock mode or high-speed on-chip oscillator mode
Step (5)
VCA20 0 (internal power low consumption disabled) (2)
Interrupt handling
Step (6)
Start XIN clock or high-speed on-chip oscillator clock
Step (1)
Enter low-speed clock mode or low-speed on-chip oscillator mode If the high-speed clock or high-speed on-chip oscillator starts during the interrupt routine, execute steps (1) to (3) at the end of the routine.
Step (7)
(Wait until XIN clock or high-speed on-chip oscillator clock oscillation stabilizes)
Step (2)
Stop XIN clock and high-speed on-chip oscillator clock
Step (8)
Enter high-speed clock mode or high-speed on-chip oscillator mode
Step (3)
VCA20 1 (internal power low consumption enabled) (2, 3)
Interrupt handling completed
Notes: 1. Execute this routine to handle all interrupts generated in wait mode. However, this does not apply if it is not necessary to start the high-speed clock or high-speed on-chip oscillator during the interrupt routine. 2. Do not set the VCA20 bit to 0 with the instruction immediately after setting the VCA20 bit to 1. Also, do not do the opposite. 3. When the VCA20 bit is set to 1, do not set the CM10 bit to 1 (stop mode). 4. When the MCU enters wait mode, follow 9.7.2 Wait Mode. VCA20: Bit in VCA2 register
Figure 31.1
Handling Procedure for Reducing Internal Power Consumption Using VCA20 Bit
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31. Reducing Power Consumption
31.2.10 Stopping Flash Memory
In low-speed on-chip oscillator mode and low-speed clock mode, power consumption can be further reduced by stopping the flash memory using the FMSTP bit in the FMR0 register. Access to the flash memory is disabled by setting the FMSTP bit to 1 (flash memory stops). The FMSTP bit must be written to by a program transferred to RAM. When the MCU enters stop mode or wait mode while CPU rewrite mode is disabled, the power for the flash memory is automatically turned off. It is turned back on again after the MCU exit stop mode or wait mode. This eliminates the need to set the FMR0 register. Figure 31.2 shows the Handling Procedure Example for Reducing Power Consumption Using FMSTP Bit.
FMSTP bit setting program After writing 0 to the FMR01 bit, write 1 (CPU rewrite mode enabled)
Transfer the FMSTP bit setting program to the RAM
Write 1 to the FMSTP bit (flash memory stops. low power consumption state) (1) Jump to the FMSTP bit setting program (The subsequent processing is executed by the program in the RAM)
Enter low-speed clock mode or low-speed on-chip oscillator mode
Stop the high-speed on-chip oscillator
Process in low-speed clock mode or low-speed on-chip oscillator mode
Switch the clock source for the CPU clock
(2)
Write 0 to the FMSTP bit (flash memory operates)
Write 0 to the FMR01 bit (CPU rewrite mode disabled)
Notes: 1. After setting the FMR01 bit to 1 (CPU rewrite mode enabled), set the FMSTP bit to 1 (flash memory stops). 2. Before switching the CPU clock source, make sure the designated clock is stable. 3. Insert a 60-s wait time by a program. Do not access the flash memory during this wait time.
Wait until the flash memory circuit stabilizes (60 s) (3)
Jump to the specified address in the flash memory
FMR01, FMSTP: Bits in FMR0 register
Figure 31.2
Handling Procedure Example for Reducing Power Consumption Using FMSTP Bit
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31. Reducing Power Consumption
31.2.11 Low-Current-Consumption Read Mode
In low-speed clock mode and low-speed on-chip oscillator mode, the current consumption when reading the flash memory can be reduced by setting the FMR27 bit in the FMR2 register to 1 (enabled). Figure 31.3 shows the Handling Procedure Example of Low-Current-Consumption Read Mode.
Handling procedure for enabling low-current-consumption read mode by FMR27 bit
Step (1)
Enter low-speed clock mode or low-speed on-chip oscillator mode
Step (2)
Stop the high-speed on-chip oscillator clock
Step (3)
FMR27 1 (low-current-consumption read mode enabled) (1)
Step (4)
Enter low-current-consumption read mode (2)
Step (5)
FMR27 0 (low-current-consumption read mode disabled)
Step (6)
Start the high-speed on-chip oscillator clock
Step (7)
(Wait until the high-speed on-chip oscillator clock oscillation stabilizes)
Step (8)
Enter high-speed on-chip oscillator mode
Notes: 1. To set the FMR27 bit to 1, first write 0 and then write 1 immediately. After writing 0, do not generate an interrupt before writing 1. 2. In low-current-consumption read mode, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled). FMR27: Bit in FMR2 register
Figure 31.3
Handling Procedure Example of Low-Current-Consumption Read Mode
31.2.12 Others
Set the MSTTRD bit in the MSTCR register to 1. The power consumption of the peripheral functions can be reduced.
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R8C/32A Group
32. Electrical Characteristics
32. Electrical Characteristics
Table 32.1
Symbol VCC/AVCC Supply voltage VI Input voltage P1_0 to P1_7, P3_3 to P3_5, P3_7, P4_5 to P4_7, MODE, RESET XIN, XOUT XIN, XOUT XCIN XCIN VO Output voltage P1_0 to P1_7, P3_3 to P3_5, P3_7, P4_5 to P4_7 XOUT XOUT XCOUT XCOUT Pd Topr Tstg Power dissipation Operating ambient temperature Storage temperature XIN-XOUT oscillation on (oscillation buffer ON) (1) XIN-XOUT oscillation off (oscillation buffer OFF) (1) XCIN-XCOUT oscillation on (oscillation buffer ON) (1) XCIN-XCOUT oscillation off (oscillation buffer OFF) (1) Topr = 25C XIN-XOUT oscillation on (oscillation buffer ON) (1) XIN-XOUT oscillation off (oscillation buffer OFF) (1) XCIN-XCOUT oscillation on (oscillation buffer ON) (1) XCIN-XCOUT oscillation off (oscillation buffer OFF) (1)
Absolute Maximum Ratings
Parameter Condition Rated Value Unit V V V V V V V V V V V mW
-0.3 to 6.5 -0.3 to VCC + 0.3 -0.3 to 1.65 -0.3 to VCC + 0.3 -0.3 to 1.65 -0.3 to VCC + 0.3 -0.3 to VCC + 0.3 -0.3 to 1.65 -0.3 to VCC + 0.3 -0.3 to 1.65 -0.3 to VCC + 0.3
TBD -20 to 85 (N version) / -40 to 85 (D version) -65 to 150
C C
Note: 1. For the register settings for each operation, refer to 7. I/O Ports and 9. Clock Generation Circuit.
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R8C/32A Group
32. Electrical Characteristics
Table 32.2
Symbol
Recommended Operating Conditions
Parameter Conditions Standard Min. 1.8
CMOS Input level selection 4.0 V VCC 5.5 V input : 0.35 VCC 2.7 V VCC < 4.0 V
Typ.
Max. 5.5
Unit V V V V V V V V V V V V V V V V V V V V mA mA mA mA mA mA mA mA mA mA mA mA MHz MHz MHz MHz kHz V V MHz MHz MHz V MHz MHz MHz MHz MHz MHz MHz MHz
VCC/AVCC Supply voltage VSS/AVSS Supply voltage
-
0
VIH
Input "H" voltage Input level switching function (I/O port)
1.8 V VCC < 2.7 V
Input level selection 4.0 V VCC 5.5 V : 0.5 VCC 2.7 V VCC < 4.0 V
1.8 V VCC < 2.7 V
Input level selection 4.0 V VCC 5.5 V : 0.7 VCC 2.7 V VCC < 4.0 V
- 0.45 VCC 0.55 VCC 0.65 VCC 0.6 VCC 0.7 VCC 0.8 VCC 0.85 VCC
0.85 VCC 0.85 VCC
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 32.768 - - - - - - - - - - - - - -
- VCC VCC VCC VCC VCC VCC VCC
VCC VCC
0.2 VCC
1.8 V VCC < 2.7 V VIL Input "L" voltage Input level switching function (I/O port)
CMOS Input level selection 4.0 V VCC 5.5 V input : 0.35 VCC 2.7 V VCC < 4.0 V
0 0 0 0 0 0 0 0 0
0.2 VCC 0.2 VCC 0.4 VCC 0.3 VCC 0.2 VCC
0.55 VCC 0.45 VCC 0.35 VCC
1.8 V VCC < 2.7 V
Input level selection 4.0 V VCC 5.5 V : 0.5 VCC 2.7 V VCC < 4.0 V
1.8 V VCC < 2.7 V
Input level selection 4.0 V VCC 5.5 V : 0.7 VCC 2.7 V VCC < 4.0 V
1.8 V VCC < 2.7 V IOH(sum) IOH(sum) IOH(peak) IOH(avg) IOL(sum) IOL(sum) IOL(peak) IOL(avg) f(XIN)
Peak sum output Sum of all pins IOH(peak) Average sum
- - - - - - - - - - - - 0 0 0 0 - 2.7 1.8
0 0 0 1.8 0 0 0 0 0 0 0 0
TBD TBD
Sum of all pins IOH(avg) Drive capacity Low Drive capacity High Drive capacity Low Drive capacity High Sum of all pins IOL(avg) Drive capacity Low Drive capacity High Drive capacity Low Drive capacity High 3.0 V VCC 5.5 V 2.7 V VCC < 3.0 V 2.2 V VCC < 2.7 V 1.8 V VCC < 2.2 V
Peak output "H" current Average output "H" current
Average sum
Peak sum output Sum of all pins IOL(peak)
-10 -40 -5 -20 TBD
TBD 10 40 5 20 20 10 5 2 50 5.5 5.5 20 10 5 5.5 20 10 5 2 20 10 5 2
Peak output "L" current Average output "L" current
XIN clock input oscillation frequency
f(XCIN)
XCIN clock input oscillation frequency fOCO40M operating
1.8 V VCC 5.5 V
-
fOCO-F
When used as the count source for timer RC fOCO40M = 40MHz When used as the count source for fOCO-F fOCO40M = 40MHz
fOCO-F frequency
3.0 V VCC 5.5 V 2.7 V VCC < 3.0 V 2.2 V VCC < 2.7 V
- -
fOCO-S operating voltage System clock frequency
fOCO-S = 125kHz 3.0 V VCC 5.5 V 2.7 V VCC < 3.0 V 2.2 V VCC < 2.7 V 1.8 V VCC < 2.2 V
f(BCLK)
CPU clock frequency
3.0 V VCC 5.5 V 2.7 V VCC < 3.0 V 2.2 V VCC < 2.7 V 1.8 V VCC < 2.2 V
Notes: 1. VCC = 1.8 to 5.5 V at Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified. 2. The average output current indicates the average value of current measured during 100 ms.
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R8C/32A Group
32. Electrical Characteristics
P1 P3 P4
30pF
Figure 32.1
Ports P1, P3, P4 Timing Measurement Circuit
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R8C/32A Group
32. Electrical Characteristics
Table 32.3
Symbol
A/D Converter Characteristics (1)
Parameter Conditions Vref = AVCC 10-bit mode Vref = AVCC = 5.0V Vref = AVCC = 3.3V Vref = AVCC = 3.0V Vref = AVCC = 2.2V 8-bit mode Vref = AVCC = 5.0V Vref = AVCC = 3.3V Vref = AVCC = 3.0V Vref = AVCC = 2.2V AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input AN8 to AN11 input Standard Min. Typ. Max. 10 3 5 5 5 2 2 2 2 3 5 5 5 2 2 2 2 Unit Bit LSB LSB LSB LSB LSB LSB LSB LSB LSB LSB LSB LSB LSB LSB LSB LSB k LSB LSB LSB k
- INL
Resolution
Integral non-linearity error
-
Absolute accuracy
10-bit mode
Vref = AVCC = 5.0V Vref = AVCC = 3.3V Vref = AVCC = 3.0V Vref = AVCC = 2.2V
8-bit mode
Vref = AVCC = 5.0V Vref = AVCC = 3.3V Vref = AVCC = 3.0V Vref = AVCC = 2.2V
- DNL - - RLADDER tCONV
Tolerance level impedance Differential non-linearity error Offset error Gain error Ladder resistance Conversion time 10-bit mode 8-bit mode Vref = AVCC Vref = AVCC = 5.0V, AD = 20 MHz Vref = AVCC = 5.0V, AD = 20 MHz
- - - - - - - - - - - - - - - - - - - - - 10 2.0
2.0 0.60 2.2 0 1.24
- - - - - - - - - - - - - - - - - 3 - - - - - - - - -
1.34
- 1 3 3 40 - - -
AVCC Vref 1.44
s s s V V
V
tSAMP Vref VIA
Sampling time Reference voltage Analog input voltage (3)
OCVREF On-chip reference voltage
Notes: 1. VCC/AVCC = Vref = 2.2 to 5.5 V, VSS = 0V at Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified. 2. Set AD frequency as follows: When AVCC = 4.0 to 5.5 V, 2 MHz AD 20 MHz When AVCC = 3.2 to 4.0 V, 2 MHz AD 16 MHz When AVCC = 3.0 to 3.2 V, 2 MHz AD 10 MHz When AVCC = 2.2 to 3.0 V, 2 MHz AD 5 MHz 3. When the analog input voltage is over the reference voltage, the A/D conversion result will be 3FFh in 10-bit mode and FFh in 8-bit mode.
REJ09B0458-0010 Rev.0.10 Page 521 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.4
Symbol LVREF LVCMP1, LVCMP2
Comparator A Electrical Characteristics
Parameter External reference voltage input range External comparison voltage input range Offset Comparator output delay time (2) Comparator operating current VCC = 5.0 V Condition Standard Min. 1.4 -0.3 Typ. Max. VCC VCC + 0.3 TBD TBD TBD Unit V V mV
- -
TBD TBD TBD
- - -
- - -
s A
Note: 1. VCC = 2.7 to 5.5 V, Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified. 2. When the digital filter is not selected.
Table 32.5
Symbol Vref VI
Comparator B Electrical Characteristics
Parameter IVREF1, IVREF3 input reference voltage IVCMP1, IVCMP3 input voltage Offset Comparator output delay time (2) Comparator operating current VI = Vref 10 mV VCC = 5.0 V Condition Standard Min. 0 -0.3 - - Typ. Max. VCC - 1.4 VCC + 0.3 TBD TBD TBD Unit V V mV
- td
ICMP
- - TBD TBD
TBD
s A
-
Note: 1. VCC = 2.7 to 5.5 V, Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified. 2. When the digital filter is not selected.
REJ09B0458-0010 Rev.0.10 Page 522 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.6
Symbol
Flash Memory (Program ROM) Electrical Characteristics
Parameter Program/erase endurance (2) Byte program time Block erase time Time delay from suspend request until suspend Interval from erase start/restart until following suspend request (8) Time from suspend until erase restart Program, erase voltage Read voltage Program, erase temperature Data hold time (7) Ambient temperature = 55C Conditions Standard Min. 1,000 (3) Typ. Max. Unit times
- - - td(SR-SUS) - - - - - -
-
80 0.3
-
TBD TBD 5+CPU clock x 3 cycles
- - -
0
- - - - - - -
s s ms s s
V V C year
-
30+CPU clock x 1 cycle 5.5 5.5 60
-
2.7 1.8 0 20
-
Notes: 1. VCC = 2.7 to 5.5 V at Topr = 0 to 60C, unless otherwise specified. 2. Definition of programming/erasure endurance The programming and erasure endurance is defined on a per-block basis. If the programming and erasure endurance is n (n = 100 or 10,000), each block can be erased n times. For example, if 1,024 1-byte writes are performed to block A, a 1 Kbyte block, and then the block is erased, the programming/erasure endurance still stands at one. However, the same address must not be programmed more than once per erase operation (overwriting prohibited). 3. Endurance to guarantee all electrical characteristics after program and erase. (1 to Min. value can be guaranteed). 4. In a system that executes multiple programming operations, the actual erasure count can be reduced by writing to sequential addresses in turn so that as much of the block as possible is used up before performing an erase operation. For example, when programming groups of 16 bytes, the effective number of rewrites can be minimized by programming up to 128 groups before erasing them all in one operation. It is also advisable to retain data on the erase count of each block and limit the number of erase operations to a certain number. 5. If an error occurs during block erase, attempt to execute the clear status register command, then execute the block erase command at least three times until the erase error does not occur. 6. Customers desiring program/erase failure rate information should contact their Renesas technical support representative. 7. The data hold time includes time that the power supply is off or the clock is not supplied. 8. The erase sequence does not proceed unless the interval of 20 ms or more is allowed from when an erase operation starts/restarts until the following suspend is requested.
REJ09B0458-0010 Rev.0.10 Page 523 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.7
Symbol
Flash Memory (Data flash Block A to Block D) Electrical Characteristics (4)
Parameter Program/erase endurance (2) Byte program time (program/erase endurance 1,000 times) Byte program time (program/erase endurance > 1,000 times) Block erase time (program/erase endurance 1,000 times) Block erase time (program/erase endurance > 1,000 times) Time delay from suspend request until suspend Interval from erase start/restart until following suspend request (10) Time from suspend until erase restart Program, erase voltage Read voltage Program, erase temperature Data hold time (9) Ambient temperature = 55 C Conditions Standard Min.
10,000 (3)
Typ.
Max.
Unit times
- - - - -
td(SR-SUS)
-
160 300 0.2 0.3
-
TBD
- - - - -
0
s s
s s ms
-
1 1 5+CPU clock x 3 cycles
- - - - - - -
- - - - - -
-
30+CPU clock x 1 cycle 5.5 5.5 85
s s
V V C year
-
2.7 1.8
-20 (8) 20
-
Notes: 1. VCC = 2.7 to 5.5 V at Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified. 2. Definition of programming/erasure endurance The programming and erasure endurance is defined on a per-block basis. If the programming and erasure endurance is n (n = 100 or 10,000), each block can be erased n times. For example, if 1,024 1-byte writes are performed to block A, a 1 Kbyte block, and then the block is erased, the programming/erasure endurance still stands at one. However, the same address must not be programmed more than once per erase operation (overwriting prohibited). 3. Endurance to guarantee all electrical characteristics after program and erase. (1 to Min. value can be guaranteed). 4. Standard of block A to block D when program and erase endurance exceeds 1,000 times. Byte program time to 1,000 times is the same as that in program ROM. 5. In a system that executes multiple programming operations, the actual erasure count can be reduced by writing to sequential addresses in turn so that as much of the block as possible is used up before performing an erase operation. For example, when programming groups of 16 bytes, the effective number of rewrites can be minimized by programming up to 128 groups before erasing them all in one operation. It is also advisable to retain data on the erase count of each block and limit the number of erase operations to a certain number. 6. If an error occurs during block erase, attempt to execute the clear status register command, then execute the block erase command at least three times until the erase error does not occur. 7. Customers desiring program/erase failure rate information should contact their Renesas technical support representative. 8. -40C for D version. 9. The data hold time includes time that the power supply is off or the clock is not supplied. 10. The erase sequence does not proceed unless the interval of 3 ms or more is allowed from when an erase operation starts/restarts until the following suspend is requested.
Suspend request (FMR21 bit)
FST6 bit
Fixed time Clock-dependent time Access restart
td(SR-SUS)
FST6: Bit in FST register FMR21: Bit in FMR2 register
Figure 32.2
Time delay until Suspend
REJ09B0458-0010 Rev.0.10 Page 524 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.8
Symbol Vdet0
Voltage Detection 0 Circuit Electrical Characteristics
Parameter Voltage detection level Vdet0_0 (2) Voltage detection level Vdet0_1 (2) Voltage detection level Vdet0_2 Voltage detection level Vdet0_3
(2) (2)
Condition At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC VCA25 = 1, VCC = 5.0 V
Standard Min. 1.80 2.20 2.70 3.65 Typ. 1.90 2.35 2.85 3.80 TBD Max. 2.00 2.50 3.00 3.95
Unit V V V V
- td(E-A)
Vccmin
Voltage detection circuit self power consumption Waiting time until voltage detection circuit operation starts (3) MCU operating voltage minimum value
- -
2.2
- -
- TBD -
A s
V
Notes: 1. The measurement condition is VCC = 1.8 V to 5.5 V and Topr = -20 to 85C (N version) / -40 to 85C (D version). 2. Select the voltage detection level with bits VDSEL0 and VDSEL1 in the OFS register. 3. Necessary time until the voltage detection circuit operates when setting to 1 again after setting the VCA25 bit in the VCA2 register to 0.
Table 32.9
Symbol Vdet1
Voltage Detection 1 Circuit Electrical Characteristics
Parameter Voltage detection level Vdet1_0 (2) Voltage detection level Vdet1_1
(2)
Condition At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC At the falling of VCC VCA26 = 1, VCC = 5.0 V
Standard Min. 2.05 2.20 2.35 2.50 2.65 2.80 2.90 3.05 3.20 3.35 3.50 3.65 3.80 3.95 4.10 4.25 Typ. 2.20 2.35 2.50 2.65 2.80 2.95 3.10 3.25 3.40 3.55 3.70 3.85 4.00 4.15 4.30 4.45 40 TBD Max. 2.35 2.50 2.65 2.80 2.95 3.10 3.30 3.45 3.60 3.75 3.90 4.05 4.20 4.35 4.50 4.65
Unit V V V V V V V V V V V V V V V V
Voltage detection level Vdet1_2 (2) Voltage detection level Vdet1_3 (2) Voltage detection level Vdet1_4 (2) Voltage detection level Vdet1_5 Voltage detection level Vdet1_6
(2) (2)
Voltage detection level Vdet1_7 (2) Voltage detection level Vdet1_8 (2) Voltage detection level Vdet1_9 Voltage detection level Vdet1_A
(2) (2)
Voltage detection level Vdet1_B (2) Voltage detection level Vdet1_C (2) Voltage detection level Vdet1_D Voltage detection level Vdet1_E
(2) (2)
Voltage detection level Vdet1_F (2)
- - td(E-A)
Notes: 1. 2. 3. 4.
Voltage monitor 1 interrupt request generation time (3) Voltage detection circuit self power consumption Waiting time until voltage detection circuit operation starts (4)
- - -
- -
TBD
s A s
-
The measurement condition is VCC = 1.8 V to 5.5 V and Topr = -20 to 85C (N version) / -40 to 85C (D version). Select the voltage detection level with bits VD1S0 to VD1S3 in the VD1LS register. Time until the voltage monitor 1 interrupt request is generated after the voltage passes Vdet1. Necessary time until the voltage detection circuit operates when setting to 1 again after setting the VCA26 bit in the VCA2 register to 0.
REJ09B0458-0010 Rev.0.10 Page 525 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.10
Symbol Vdet2
Voltage Detection 2 Circuit Electrical Characteristics
Parameter Condition At the falling of VCC At the falling of LVCMP2 VCA27 = 1, VCC = 5.0 V Standard Min. 3.80 1.24 Typ. 4.00 1.34 40 TBD Max. 4.20 1.44 Unit V V
Voltage detection level Vdet2_0 (2) Voltage detection level Vdet2_EXT (2) Voltage monitor 2 interrupt request generation time (3) Voltage detection circuit self power consumption Waiting time until voltage detection circuit operation starts (4)
- - td(E-A)
Notes: 1. 2. 3. 4.
- - -
- - TBD
s A s
-
The measurement condition is VCC = 1.8 V to 5.5 V and Topr = -20 to 85C (N version) / -40 to 85C (D version). The voltage detection level varies with detection targets. Select the level with the VCA24 bit in the VCA2 register. Time until the voltage monitor 2 interrupt request is generated after the voltage passes Vdet2. Necessary time until the voltage detection circuit operates after setting to 1 again after setting the VCA27 bit in the VCA2 register to 0.
Table 32.11
Symbol Vpor1 Vpor2 trth
Power-on Reset Circuit, Voltage Monitor 0 Reset Electrical Characteristics(3)
Parameter Power-on reset valid voltage (4) Power-on reset or voltage monitor 0 reset valid voltage External power VCC rise gradient (2) Condition Standard Min. Typ. Max. 1.0 Vdet0 Unit V V mV/msec
-
0 20
- - -
-
Notes: 1. The measurement condition is Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified. 2. This condition (external power VCC rise gradient) does not apply if VCC 1.0 V. 3. To use the power-on reset function, enable voltage monitor 0 reset by setting the LVD0ON bit in the OFS register to 0, the VW0C0 and VW0C6 bits in the VW0C register to 1 respectively, and the VCA25 bit in the VCA2 register to 1. 4. tw(por1) indicates the duration the external power VCC must be held below the effective voltage (Vpor1) to enable a power on reset. When turning on the power for the first time, maintain tw(por1) for 1 ms or more.
Vdet0 (3) 1.8V External Power VCC Vpor1 tw(por1) Sampling time (1, 2) trth Vpor2 trth
Vdet0 (3)
Internal reset signal ("L" valid) 1 x 32 fOCO-S 1 x 32 fOCO-S
Notes: 1. When using the voltage monitor 0 digital filter, ensure that the voltage is within the MCU operation voltage range (1.8 V or above) during the sampling time. 2. The sampling clock can be selected. Refer to 6. Voltage Detection Circuit for details. 3. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to 6. Voltage Detection Circuit for details.
Figure 32.3
Power-on Reset Circuit Electrical Characteristics
REJ09B0458-0010 Rev.0.10 Page 526 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.12
Symbol fOCO40M
High-speed On-Chip Oscillator Circuit Electrical Characteristics
Parameter High-speed on-chip oscillator frequency after reset High-speed on-chip oscillator frequency when the FRA4 register correction value is written into the FRA1 register and the FRA5 register correction value into the FRA3 register (4) High-speed on-chip oscillator frequency when the FRA6 register correction value is written into the FRA1 register and the FRA7 register correction value into the FRA3 register High-speed on-chip oscillator frequency temperature * supply voltage dependence (2) VCC = 2.7 V to 5.5 V -20C Topr 85C VCC = 2.7 V to 5.5 V -40C Topr 85C VCC = 2.2 V to 5.5 V -20C Topr 85C VCC = 2.2 V to 5.5 V -40C Topr 85C VCC = 1.8 V to 5.5 V -20C Topr 85C VCC = 1.8 V to 5.5 V -40C Topr 85C Condition VCC = 5.0 V, Topr = 25C Standard Min. TBD (3) TBD (3) Typ. 40 36.864 Max. TBD (3) TBD (3) Unit MHz MHz
TBD (3)
32
TBD (3)
MHz
TBD TBD TBD TBD TBD TBD
- - - - - -
TBD TBD
TBD TBD TBD TBD TBD TBD TBD
% % % % % %
- -
Notes: 1. 2. 3. 4.
Oscillation stability time Self power consumption at oscillation
VCC = 5.0 V, Topr = 25C VCC = 5.0 V, Topr = 25C
- -
-
s A
VCC = 1.8 to 5.5 V, Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified. This indicates the precision error for the frequency set to fOCO40M. These values are not guaranteed. This enables the setting errors of bit rates such as 9600 bps and 38400 bps to be 0% when the serial interface is used in UART mode.
Table 32.13
Symbol fOCO-S - -
Low-speed On-Chip Oscillator Circuit Electrical Characteristics
Parameter Low-speed on-chip oscillator frequency Oscillation stability time Self power consumption at oscillation VCC = 5.0 V, Topr = 25C VCC = 5.0 V, Topr = 25C Condition Standard Min. 60 Typ. 125 10 1 Max. 250 100 Unit kHz
- -
-
s A
Note: 1. VCC = 1.8 to 5.5 V, Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified.
Table 32.14
Symbol td(P-R) td(R-S)
Power Supply Circuit Timing Characteristics
Parameter Condition Standard Min. Typ. Max. TBD TBD Unit
Time for internal power supply stabilization during power-on(2) STOP exit time(3)
- -
- -
s s
Notes: 1. The measurement condition is VCC = 1.8 to 5.5 V and Topr = 25C. 2. Waiting time until the internal power supply generation circuit stabilizes during power-on. 3. Time until system clock supply starts after the interrupt is acknowledged to exit stop mode.
REJ09B0458-0010 Rev.0.10 Page 527 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.15
Symbol tSUCYC tHI tLO tRISE tFALL tSU tH tLEAD tLAG tOD tSA tOR
Timing Requirements of Clock Synchronous Serial I/O with Chip Select (1)
Parameter SSCK clock cycle time SSCK clock "H" width SSCK clock "L" width SSCK clock rising time SSCK clock falling time Master Slave Master Slave Conditions Standard Min. 4 0.4 0.4 Typ. Max. Unit tCYC (2) tSUCYC tSUCYC tCYC (2)
- - - - - - - - - - - - - - - -
-
0.6 0.6 1 1 1 1 - -
- - - -
100 1 1tCYC + 50 1tCYC + 50
s
tCYC (2)
SSO, SSI data input setup time SSO, SSI data input hold time SCS setup time SCS hold time SSI slave access time SSI slave out open time Slave Slave 2.7 V VCC 5.5 V 1.8 V VCC < 2.7 V 2.7 V VCC 5.5 V 1.8 V VCC < 2.7 V
s ns
tCYC (2) ns ns tCYC (2) ns ns ns ns
- -
1 1.5tCYC + 100 1.5tCYC + 200 1.5tCYC + 100 1.5tCYC + 200
SSO, SSI data output delay time
- - - - -
Notes: 1. VCC = 1.8 to 5.5 V, VSS = 0 V at Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified. 2. 1tCYC = 1/f1(s)
REJ09B0458-0010 Rev.0.10 Page 528 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
4-Wire Bus Communication Mode, Master, CPHS = 1
VIH or VOH
SCS (output)
VIH or VOH tHI tFALL tRISE
SSCK (output) (CPOS = 1)
tLO tHI
SSCK (output) (CPOS = 0)
tLO tSUCYC
SSO (output)
tOD
SSI (input)
tSU tH
4-Wire Bus Communication Mode, Master, CPHS = 0
VIH or VOH
SCS (output)
VIH or VOH tHI tFALL tRISE
SSCK (output) (CPOS = 1)
tLO tHI
SSCK (output) (CPOS = 0)
tLO tSUCYC
SSO (output)
tOD
SSI (input)
tSU tH
CPHS, CPOS: Bits in SSMR register
Figure 32.4
I/O Timing of Clock Synchronous Serial I/O with Chip Select (Master)
REJ09B0458-0010 Rev.0.10 Page 529 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
4-Wire Bus Communication Mode, Slave, CPHS = 1
VIH or VOH
SCS (input)
VIH or VOH tLEAD tHI tFALL tRISE tLAG
SSCK (input) (CPOS = 1)
tLO tHI
SSCK (input) (CPOS = 0)
tLO tSUCYC
SSO (input)
tSU tH
SSI (output)
tSA tOD tOR
4-Wire Bus Communication Mode, Slave, CPHS = 0 SCS (input)
VIH or VOH VIH or VOH tLEAD tHI tFALL tRISE tLAG
SSCK (input) (CPOS = 1)
tLO tHI
SSCK (input) (CPOS = 0)
tLO tSUCYC
SSO (input)
tSU tH
SSI (output)
tSA tOD tOR
CPHS, CPOS: Bits in SSMR register
Figure 32.5
I/O Timing of Clock Synchronous Serial I/O with Chip Select (Slave)
REJ09B0458-0010 Rev.0.10 Page 530 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
tHI VIH or VOH
SSCK
VIH or VOH tLO tSUCYC
SSO (output)
tOD
SSI (input)
tSU tH
Figure 32.6
I/O Timing of Clock Synchronous Serial I/O with Chip Select (Clock Synchronous Communication Mode)
REJ09B0458-0010 Rev.0.10 Page 531 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.16
Symbol tSCL tSCLH tSCLL tsf tSP tBUF tSTAH tSTAS tSTOP tSDAS tSDAH
Timing Requirements of I2C bus Interface (1)
Parameter Condition Standard Min. 12tCYC + 600 (2) 3tCYC + 300
(2)
Typ.
Max.
Unit ns ns ns ns ns ns ns ns ns ns ns
SCL input cycle time SCL input "H" width SCL input "L" width SCL, SDA input fall time SCL, SDA input spike pulse rejection time SDA input bus-free time Start condition input hold time Retransmit start condition input setup time Stop condition input setup time Data input setup time Data input hold time
- - - - -
- - -
300 1tCYC (2)
5tCYC + 500 (2)
- -
5tCYC 3tCYC
(2) (2)
- - - - - -
- - - - - -
3tCYC (2) 3tCYC (2) 1tCYC + 20 (2) 0
Notes: 1. VCC = 1.8 to 5.5 V, VSS = 0 V and Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified. 2. 1tCYC = 1/f1(s)
VIH
SDA
VIL tBUF tSTAH tSCLH tSTAS tSP tSTOP
SCL
P(2) S(1) tsf tSCLL tSCL Sr(3) tsr tSDAH tSDAS P(2)
Notes: 1. Start condition 2. Stop condition 3. Retransmit start condition
Figure 32.7
I/O Timing of I2C bus Interface
REJ09B0458-0010 Rev.0.10 Page 532 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.17
Symbol VOH VOL VT+-VT-
Electrical Characteristics (1) [VCC = 5 V]
Parameter Condition Drive capacity High Drive capacity Low Drive capacity High Drive capacity Low INT0, INT1, INT3, KI0, KI1, KI2, KI3, TRAIO, RXD0, CLK0, CLK2, SSI, SCL, SDA, SSO RESET VI = 5 V VI = 0 V VI = 0 V XIN XCIN During stop mode IOH = -20 mA IOH = -5 mA IOL = 20 mA IOL = 5 mA Standard Min. VCC - 2.0 VCC - 2.0 Typ. Max. VCC VCC 2.0 2.0 Unit V V V V V
Output "H" voltage Output "L" voltage Hysteresis
- - 0.1
- - - - 0.5
-
0.1
1.0
-
5.0 -5.0 167 -
V
IIH IIL RfXIN RfXCIN VRAM
Input "H" current Input "L" current Feedback resistance Feedback resistance RAM hold voltage
RPULLUP Pull-up resistance
- - 30 - -
1.8
- - 50 1.0
18
A A k M
M V
- -
-
Note: 1. VCC = 4.2 to 5.5 V at Topr = -20 to 85C (N version) / -40 to 85C (D version), f(XIN) = 20 MHz, unless otherwise specified.
REJ09B0458-0010 Rev.0.10 Page 533 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.18
Symbol ICC
Electrical Characteristics (2) [Vcc = 5 V] (Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified.)
Condition
XIN = 20 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz No division XIN = 16 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz No division XIN = 10 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz No division XIN = 20 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz Divide-by-8 XIN = 16 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz Divide-by-8 XIN = 10 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz Divide-by-8 XIN clock off High-speed on-chip oscillator on fOCO = 20 MHz Low-speed on-chip oscillator on = 125 kHz No division XIN clock off High-speed on-chip oscillator on fOCO = 20 MHz Low-speed on-chip oscillator on = 125 kHz Divide-by-8 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz Divide-by-8, FMR27 = 1, VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator off XCIN clock oscillator on = 32 kHz FMR27 = 1, VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator off XCIN clock oscillator on = 32 kHz Program operation on RAM Flash memory off, FMSTP = 1, VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz While a WAIT instruction is executed Peripheral clock operation VCA27 = VCA26 = VCA25 = 0 VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz While a WAIT instruction is executed Peripheral clock off VCA27 = VCA26 = VCA25 = 0 VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator off XCIN clock oscillator on = 32 kHz (peripheral clock off) While a WAIT instruction is executed VCA27 = VCA26 = VCA25 = 0 VCA20 = 1 XIN clock off, Topr = 25C High-speed on-chip oscillator off Low-speed on-chip oscillator off CM10 = 1 Peripheral clock off VCA27 = VCA26 = VCA25 = 0 XIN clock off, Topr = 85C High-speed on-chip oscillator off Low-speed on-chip oscillator off CM10 = 1 Peripheral clock off VCA27 = VCA26 = VCA25 = 0
Parameter Power supply High-speed current clock mode (VCC = 3.3 to 5.5 V) Single-chip mode, output pins are open, other pins are VSS
Min. -
Standard Typ. Max. 6.5 20
Unit mA
- - - - - - - -
5.3
16
mA
3.5
- - - -
mA
2.5
mA
2.1
mA
1.5
mA
High-speed on-chip oscillator mode
6.5
TBD
mA
2.5
-
mA
Low-speed on-chip oscillator mode Low-speed clock mode
50
400
A
-
60
400
A
-
30
-
A
Wait mode
-
15
TBD
A
-
4
TBD
A
-
3.5
-
A
Stop mode
-
2.0
TBD
A
-
5.0
-
A
REJ09B0458-0010 Rev.0.10 Page 534 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Timing Requirements (Unless Otherwise Specified: VCC = 5 V, VSS = 0 V at Topr = 25C) [VCC = 5 V] Table 32.19
Symbol tc(XIN) tWH(XIN) tWL(XIN) tc(XCIN) tWH(XCIN) tWL(XCIN) XIN input cycle time XIN input "H" width XIN input "L" width XCIN input cycle time XCIN input "H" width XCIN input "L" width
XIN Input, XCIN Input
Parameter Standard Min. 50 24 24 14 7 7 Max. Unit ns ns ns s s s
- - - - - -
tC(XIN) tWH(XIN)
VCC = 5 V
XIN input
tWL(XIN)
Figure 32.8 Table 32.20
Symbol tc(TRAIO) tWH(TRAIO) tWL(TRAIO)
XIN Input and XCIN Input Timing Diagram when VCC = 5 V TRAIO Input
Parameter TRAIO input cycle time TRAIO input "H" width TRAIO input "L" width Standard Min. 100 40 40 Max. Unit ns ns ns
- - -
tC(TRAIO) tWH(TRAIO)
VCC = 5 V
TRAIO input
tWL(TRAIO)
Figure 32.9
TRAIO Input Timing Diagram when VCC = 5 V
REJ09B0458-0010 Rev.0.10 Page 535 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.21
Symbol tc(CK) tW(CKH) tW(CKL) td(C-Q) th(C-Q) tsu(D-C) th(C-D) i = 0, 2
Serial Interface
Parameter CLKi input cycle time CLKi input "H" width CLKi input "L" width TXDi output delay time TXDi hold time RXDi input setup time RXDi input hold time Standard Min. 200 100 100 Max. Unit ns ns ns ns ns ns ns
- 0 50 90
- - - 50 - - -
tC(CK) tW(CKH)
VCC = 5 V
CLKi
tW(CKL) th(C-Q)
TXDi
td(C-Q) tsu(D-C) th(C-D)
RXDi i = 0, 2
Figure 32.10
Serial Interface Timing Diagram when VCC = 5 V
Table 32.22
Symbol tW(INH) tW(INL)
External Interrupt INTi (i = 0, 1, 3) Input, Key Input Interrupt KIi (i = 0 to 3)
Parameter INT0 input "H" width, KIi input "H" width INT0 input "L" width, KIi input "L" width Standard Min. 250 (1) 250 (2) Max. Unit ns ns
- -
Notes: 1. When selecting the digital filter by the INTi input filter select bit, use an INTi input HIGH width of either (1/digital filter clock frequency x 3) or the minimum value of standard, whichever is greater. 2. When selecting the digital filter by the INTi input filter select bit, use an INTi input LOW width of either (1/digital filter clock frequency x 3) or the minimum value of standard, whichever is greater.
VCC = 5 V
INTi input (i = 0, 1, 3) KIi input (i = 0 to 3)
tW(INL)
tW(INH)
Figure 32.11
Input Timing for External Interrupt INTi and Key Input Interrupt KIi when Vcc = 5 V
REJ09B0458-0010 Rev.0.10 Page 536 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.23
Symbol VOH VOL VT+-VT-
Electrical Characteristics (3) [VCC = 3 V]
Parameter Condition Drive capacity High IOH = -5 mA Drive capacity Low IOH = -1 mA IOL = 1 mA Drive capacity High IOL = 5 mA Drive capacity Low INT0, INT1, INT3, KI0, KI1, KI2, KI3, TRAIO, RXD0, CLK0, CLK2, SSI, SCL, SDA, SSO RESET VI = 3 V VI = 0 V VI = 0 V Standard Min. VCC - 0.5 VCC - 0.5 Typ. Max. VCC VCC 0.5 0.5 Unit V V V V V
Output "H" voltage Output "L" voltage Hysteresis
- - 0.1
- - - - 0.3
-
0.1
0.4
-
4.0 -4.0 500 - - -
V
IIH IIL RfXIN RfXCIN VRAM
Input "H" current Input "L" current Feedback resistance XIN Feedback resistance XCIN RAM hold voltage
RPULLUP Pull-up resistance
During stop mode
- - 66 - - 1.8
- - 160 3.0 18 -
A A k M M V
Note: 1. VCC =2.7 to 3.3 V at Topr = -20 to 85C (N version) / -40 to 85C (D version), f(XIN) = 10 MHz, unless otherwise specified.
REJ09B0458-0010 Rev.0.10 Page 537 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.24
Electrical Characteristics (4) [Vcc = 3 V] (Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified.)
Parameter Condition XIN = 10 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz No division XIN = 10 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz Divide-by-8 XIN clock off High-speed on-chip oscillator on fOCO = 10 MHz Low-speed on-chip oscillator on = 125 kHz No division XIN clock off High-speed on-chip oscillator on fOCO = 10 MHz Low-speed on-chip oscillator on = 125 kHz Divide-by-8 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz Divide-by-8, FMR27 = 1, VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator off XCIN clock oscillator on = 32 kHz FMR27 = 1, VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator off XCIN clock oscillator on = 32 kHz Program operation on RAM Flash memory off, FMSTP = 1, VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz While a WAIT instruction is executed Peripheral clock operation VCA27 = VCA26 = VCA25 = 0 VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz While a WAIT instruction is executed Peripheral clock off VCA27 = VCA26 = VCA25 = 0 VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator off XCIN clock oscillator on = 32 kHz (peripheral clock off) While a WAIT instruction is executed VCA27 = VCA26 = VCA25 = 0 VCA20 = 1 XIN clock off, Topr = 25C High-speed on-chip oscillator off Low-speed on-chip oscillator off CM10 = 1 Peripheral clock off VCA27 = VCA26 = VCA25 = 0 XIN clock off, Topr = 85C High-speed on-chip oscillator off Low-speed on-chip oscillator off CM10 = 1 Peripheral clock off VCA27 = VCA26 = VCA25 = 0 Min. - Standard Typ. Max. 3.5 - Unit mA
Symbol ICC
Power supply current High-speed (VCC = 2.7 to 3.3 V) clock mode Single-chip mode, output pins are open, other pins are VSS
-
1.5
-
mA
High-speed on-chip oscillator mode
-
5.5
TBD
mA
-
1.5
-
mA
Low-speed on-chip oscillator mode Low-speed clock mode
-
50
400
A
-
60
400
A
-
30
-
A
Wait mode
-
15
TBD
A
-
4
TBD
A
-
3.5
-
A
Stop mode
-
2.0
TBD
A
-
5.0
-
A
REJ09B0458-0010 Rev.0.10 Page 538 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Timing requirements (Unless Otherwise Specified: VCC = 3 V, VSS = 0 V at Topr = 25C) [VCC = 3 V] Table 32.25
Symbol tc(XIN) tWH(XIN) tWL(XIN) tc(XCIN) tWH(XCIN) tWL(XCIN) XIN input cycle time XIN input "H" width XIN input "L" width XCIN input cycle time XCIN input "H" width XCIN input "L" width
XIN Input, XCIN Input
Parameter Standard Min. 100 40 40 14 7 7 Max. Unit ns ns ns s s s
- - - - - -
tC(XIN) tWH(XIN)
VCC = 3 V
XIN input
tWL(XIN)
Figure 32.12 Table 32.26
Symbol tc(TRAIO) tWH(TRAIO) tWL(TRAIO)
XIN Input and XCIN Input Timing Diagram when VCC = 3 V TRAIO Input
Parameter TRAIO input cycle time TRAIO input "H" width TRAIO input "L" width Standard Min. 300 120 120 Max. Unit ns ns ns
- - -
tC(TRAIO) tWH(TRAIO)
VCC = 3 V
TRAIO input
tWL(TRAIO)
Figure 32.13
TRAIO Input Timing Diagram when VCC = 3 V
REJ09B0458-0010 Rev.0.10 Page 539 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.27
Symbol tc(CK) tW(CKH) tW(CKL) td(C-Q) th(C-Q) tsu(D-C) th(C-D) i = 0, 2
Serial Interface
Parameter CLKi input cycle time CLKi input "H" width CLKi Input "L" width TXDi output delay time TXDi hold time RXDi input setup time RXDi input hold time Standard Min. 300 150 150 Max. Unit ns ns ns ns ns ns ns
- 0 70 90
- - - 80 - - -
tC(CK) tW(CKH)
VCC = 3 V
CLKi
tW(CKL) th(C-Q)
TXDi
td(C-Q) tsu(D-C) th(C-D)
RXDi i = 0, 2
Figure 32.14
Serial Interface Timing Diagram when VCC = 3 V
Table 32.28
Symbol tW(INH) tW(INL)
External Interrupt INTi (i = 0, 1, 3) Input, Key Input Interrupt KIi (i = 0 to 3)
Parameter INT0 input "H" width, KIi input "H" width INT0 input "L" width, KIi input "L" width Standard Min. 380 (1) 380 (2) Max. Unit ns ns
- -
Notes: 1. When selecting the digital filter by the INTi input filter select bit, use an INTi input HIGH width of either (1/digital filter clock frequency x 3) or the minimum value of standard, whichever is greater. 2. When selecting the digital filter by the INTi input filter select bit, use an INTi input LOW width of either (1/digital filter clock frequency x 3) or the minimum value of standard, whichever is greater.
INTi input (i = 0, 1, 3) KIi input (i = 0 to 3)
VCC = 3 V
tW(INL)
tW(INH)
Figure 32.15
Input Timing for External Interrupt INTi and Key Input Interrupt KIi when Vcc = 3 V
REJ09B0458-0010 Rev.0.10 Page 540 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.29
Symbol VOH VOL VT+-VT-
Electrical Characteristics (5) [VCC = 2.2 V]
Parameter Condition Drive capacity High IOH = -2 mA Drive capacity Low IOH = -1 mA IOL = 1 mA Drive capacity High IOL = 2 mA Drive capacity Low INT0, INT1, INT3, KI0, KI1, KI2, KI3, TRAIO, RXD0, CLK0, CLK2, SSI, SCL, SDA, SSO RESET VI = 1.8 V VI = 0 V VI = 0 V Standard Min. VCC - 0.5 VCC - 0.5 Typ. Max. VCC VCC 0.5 0.5 Unit V V V V V
Output "H" voltage Output "L" voltage Hysteresis
- - 0.05
- - - - 0.3
-
0.05
0.15
-
4.0 -4.0 600 - - -
V
IIH IIL RfXIN RfXCIN VRAM
Input "H" current Input "L" current Feedback resistance XIN Feedback resistance XCIN RAM hold voltage
RPULLUP Pull-up resistance
During stop mode
- - 100 - - 1.8
- - 200 5 35 -
A A k M M V
Note: 1. VCC = 1.8 V at Topr = -20 to 85C (N version) / -40 to 85C (D version), f(XIN) = 5 MHz, unless otherwise specified.
REJ09B0458-0010 Rev.0.10 Page 541 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.30
Electrical Characteristics (6) [Vcc = 2.2 V] (Topr = -20 to 85C (N version) / -40 to 85C (D version), unless otherwise specified.)
Parameter Condition XIN = 5 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz No division XIN = 5 MHz (square wave) High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz Divide-by-8 High-speed XIN clock off High-speed on-chip oscillator on fOCO = 5 MHz on-chip Low-speed on-chip oscillator on = 125 kHz oscillator No division mode XIN clock off High-speed on-chip oscillator on fOCO = 5 MHz Low-speed on-chip oscillator on = 125 kHz Divide-by-8 Low-speed on- XIN clock off chip oscillator High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz mode Divide-by-8, FMR27 = 1, VCA20 = 1 Low-speed XIN clock off High-speed on-chip oscillator off clock mode Low-speed on-chip oscillator off XCIN clock oscillator on = 32 kHz FMR27 = 1, VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator off XCIN clock oscillator on = 32 kHz Program operation on RAM Flash memory off, FMSTP = 1, VCA20 = 1 Wait mode XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz While a WAIT instruction is executed Peripheral clock operation VCA27 = VCA26 = VCA25 = 0 VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator on = 125 kHz While a WAIT instruction is executed Peripheral clock off VCA27 = VCA26 = VCA25 = 0 VCA20 = 1 XIN clock off High-speed on-chip oscillator off Low-speed on-chip oscillator off XCIN clock oscillator on = 32 kHz (peripheral clock off) While a WAIT instruction is executed VCA27 = VCA26 = VCA25 = 0 VCA20 = 1 Stop mode XIN clock off, Topr = 25C High-speed on-chip oscillator off Low-speed on-chip oscillator off CM10 = 1 Peripheral clock off VCA27 = VCA26 = VCA25 = 0 XIN clock off, Topr = 85C High-speed on-chip oscillator off Low-speed on-chip oscillator off CM10 = 1 Peripheral clock off VCA27 = VCA26 = VCA25 = 0 Min. - Standard Typ. Max. 2.2 - Unit mA
Symbol ICC
Power supply current High-speed (VCC = 1.8 to 2.7 V) clock mode Single-chip mode, output pins are open, other pins are VSS
-
0.8
-
mA
-
4
-
mA
-
1.7
-
mA
-
50
300
A
-
60
350
A
-
30
-
A
-
15
TBD
A
-
4
TBD
A
-
3.5
-
A
-
2.0
TBD
A
-
5.0
-
A
REJ09B0458-0010 Rev.0.10 Page 542 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Timing requirements (Unless Otherwise Specified: VCC = 2.2 V, VSS = 0 V at Topr = 25C) [VCC = 2.2 V] Table 32.31
Symbol tc(XIN) tWH(XIN) tWL(XIN) tc(XCIN) tWH(XCIN) tWL(XCIN) XIN input cycle time XIN input "H" width XIN input "L" width XCIN input cycle time XCIN input "H" width XCIN input "L" width
XIN Input, XCIN Input
Parameter Standard Min. 200 90 90 14 7 7 Max. Unit ns ns ns s s s
- - - - - -
tC(XIN) tWH(XIN)
VCC = 2.2 V
XIN input
tWL(XIN)
Figure 32.16 Table 32.32
Symbol tc(TRAIO) tWH(TRAIO) tWL(TRAIO)
XIN Input and XCIN Input Timing Diagram when VCC = 2.2 V TRAIO Input
Parameter TRAIO input cycle time TRAIO input "H" width TRAIO input "L" width Standard Min. 500 200 200 Max. Unit ns ns ns
- - -
tC(TRAIO) tWH(TRAIO)
VCC = 2.2 V
TRAIO input
tWL(TRAIO)
Figure 32.17
TRAIO Input Timing Diagram when VCC = 2.2 V
REJ09B0458-0010 Rev.0.10 Page 543 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
32. Electrical Characteristics
Table 32.33
Symbol tc(CK) tW(CKH) tW(CKL) td(C-Q) th(C-Q) tsu(D-C) th(C-D) i = 0, 2
Serial Interface
Parameter CLKi input cycle time CLKi input "H" width CLKi input "L" width TXDi output delay time TXDi hold time RXDi input setup time RXDi input hold time Standard Min. 800 400 400 Max. Unit ns ns ns ns ns ns ns
- 0 150 90
- - - 200 - - -
tC(CK) tW(CKH)
VCC = 2.2 V
CLKi
tW(CKL) th(C-Q)
TXDi
td(C-Q) tsu(D-C) th(C-D)
RXDi i = 0, 2
Figure 32.18
Serial Interface Timing Diagram when VCC = 2.2 V
Table 32.34
Symbol tW(INH) tW(INL)
External Interrupt INTi (i = 0, 1, 3) Input, Key Input Interrupt KIi (i = 0 to 3)
Parameter INT0 input "H" width, KIi input "H" width INT0 input "L" width, KIi input "L" width Standard Min. 1000 (1) 1000 (2) Max. Unit ns ns
- -
Notes: 1. When selecting the digital filter by the INTi input filter select bit, use an INTi input HIGH width of either (1/digital filter clock frequency x 3) or the minimum value of standard, whichever is greater. 2. When selecting the digital filter by the INTi input filter select bit, use an INTi input LOW width of either (1/digital filter clock frequency x 3) or the minimum value of standard, whichever is greater.
INTi input (i = 0, 1, 3) KIi input (i = 0 to 3)
VCC = 2.2 V
tW(INL)
tW(INH)
Figure 32.19
Input Timing for External Interrupt INTi and Key Input Interrupt KIi when Vcc = 2.2 V
REJ09B0458-0010 Rev.0.10 Page 544 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
33. Usage Notes
33. Usage Notes
33.1 33.1.1 Notes on Clock Generation Circuit Stop Mode
To enter stop mode, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled) and then the CM10 bit in the CM1 register to 1 (stop mode). An instruction queue pre-reads 4 bytes from the instruction which sets the CM10 bit to 1 (stop mode) and the program stops. Insert at least four NOP instructions following the JMP.B instruction after the instruction which sets the CM10 bit to 1. * Program example to enter stop mode BCLR BSET FSET BSET JMP.B LABEL_001: NOP NOP NOP NOP
1,FMR0 0,PRCR I 0,CM1 LABEL_001
; CPU rewrite mode disabled ; Protect disabled ; Enable interrupt ; Stop mode
33.1.2
Wait Mode
To enter wait mode with the WAIT instruction, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled) and then execute the WAIT instruction. An instruction queue pre-reads 4 bytes from the WAIT instruction and the program stops. Insert at least four NOP instructions after the WAIT instruction. * Program example to execute the WAIT instruction BCLR 1,FMR0 FSET I WAIT NOP NOP NOP NOP
; CPU rewrite mode disabled ; Enable interrupt ; Wait mode
33.1.3
Oscillation Stop Detection Function
Since the oscillation stop detection function cannot be used if the XIN clock frequency is below 2 MHz, set bits OCD1 to OCD0 to 00b.
33.1.4
Oscillation Circuit Constants
Consult the oscillator manufacturer to determine the optimal oscillation circuit constants for the user system. To use the MCU with supply voltage below VCC = 2.7 V, it is recommended to set the CM11 bit in the CM1 register to 1 (on-chip feedback resistor disabled) and connect the feedback resistor to the chip externally.
REJ09B0458-0010 Rev.0.10 Page 545 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
33. Usage Notes
33.2 33.2.1
Notes on Interrupts Reading Address 00000h
Do not read address 00000h by a program. When a maskable interrupt request is acknowledged, the CPU reads interrupt information (interrupt number and interrupt request level) from 00000h in the interrupt sequence. At this time, the IR bit for the acknowledged interrupt is set to 0. If address 00000h is read by a program, the IR bit for the interrupt which has the highest priority among the enabled interrupts is set to 0. This may cause the interrupt to be canceled, or an unexpected interrupt to be generated.
33.2.2
SP Setting
Set a value in the SP before an interrupt is acknowledged. The SP is set to 0000h after a reset. If an interrupt is acknowledged before setting a value in the SP, the program may run out of control.
33.2.3
External Interrupt and Key Input Interrupt
Either the "L" level width or "H" level width shown in the Electrical Characteristics is required for the signal input to pins INT0, INT1, INT3 and pins KI0 to KI3, regardless of the CPU clock. For details, refer to Table 32.22 (VCC = 5V), Table 32.28 (VCC = 3V), Table 32.34 (VCC = 2.2V) External Interrupt INTi (i = 0, 1, 3) Input, Key Input Interrupt KIi (i = 0 to 3).
REJ09B0458-0010 Rev.0.10 Page 546 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
33. Usage Notes
33.2.4
Changing Interrupt Sources
The IR bit in the interrupt control register may be set to 1 (interrupt requested) when the interrupt source changes. To use an interrupt, set the IR bit to 0 (no interrupt requested) after changing interrupt sources. Changing interrupt sources as referred to here includes all factors that change the source, polarity, or timing of the interrupt assigned to a software interrupt number. Therefore, if a mode change of a peripheral function involves the source, polarity, or timing of an interrupt, set the IR bit to 0 (no interrupt requested) after making these changes. Refer to the descriptions of the individual peripheral functions for related interrupts. Figure 33.1 shows a Procedure Example for Changing Interrupt Sources.
Interrupt source change
Disable interrupts
(2, 3)
Change interrupt sources (including mode of peripheral function)
Set the IR bit to 0 (no interrupt request) using the MOV instruction (3)
Enable interrupts
(2, 3)
Change completed
IR bit: The interrupt control register bit for the interrupt whose source is to be changed Notes: 1. The above settings must be executed individually. Do not execute two or more settings simultaneously (using one instruction). 2. To prevent interrupt requests from being generated disable the peripheral function before changing the interrupt source. In this case, use the I flag if all maskable interrupts can be disabled. If all maskable interrupts cannot be disabled, use bits ILVL0 to ILVL2 for the interrupt whose source is to be changed. 3. Refer to 11.8.5 Rewriting Interrupt Control Register for the instructions to use and related notes.
Figure 33.1 Procedure Example for Changing Interrupt Sources
REJ09B0458-0010 Rev.0.10 Page 547 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
33. Usage Notes
33.2.5
Rewriting Interrupt Control Register
(a) The contents of the interrupt control register can be rewritten only while no interrupt requests corresponding to that register are generated. If an interrupt request may be generated, disable the interrupt before rewriting the contents of the interrupt control register. (b) When rewriting the contents of the interrupt control register after disabling the interrupt, be careful to choose appropriate instructions. Changing any bit other than the IR bit If an interrupt request corresponding to the register is generated while executing the instruction, the IR bit may not be set to 1 (interrupt requested), and the interrupt may be ignored. If this causes a problem, use one of the following instructions to rewrite the contents of the register: AND, OR, BCLR, and BSET. Changing the IR bit Depending on the instruction used, the IR bit may not be set to 0 (no interrupt requested). Use the MOV instruction to set the IR bit to 0. (c) When using the I flag to disable an interrupt, set the I flag as shown in the sample programs below. Refer to (b) regarding rewriting the contents of interrupt control registers using the sample programs. Examples 1 to 3 shows how to prevent the I flag from being set to 1 (interrupts enabled) before the contents of the interrupt control register are rewritten for the effects of the internal bus and the instruction queue buffer. Example 1: Use the NOP instructions to pause program until the interrupt control register is rewritten INT_SWITCH1: FCLR I ; Disable interrupts AND.B #00H,0056H ; Set the TRAIC register to 00h NOP ; NOP FSET I ; Enable interrupts Example 2: Use a dummy read to delay the FSET instruction INT_SWITCH2: FCLR I ; Disable interrupts AND.B #00H,0056H ; Set the TRAIC register to 00h MOV.W MEM,R0 ; Dummy read FSET I ; Enable interrupts Example 3: Use the POPC instruction to change the I flag INT_SWITCH3: PUSHC FLG FCLR I ; Disable interrupts AND.B #00H,0056H ; Set the TRAIC register to 00h POPC FLG ; Enable interrupts
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33.3 33.3.1
Notes on ID Code Areas Setting Example of ID Code Areas
As the ID code areas are allocated in the flash memory (not in the SFRs), they cannot be rewritten by executing an instruction. Write appropriate values when creating a program. The following shows a setting example.
* To set 55h in all of the ID code areas
.org 00FFDCH .lword dummy | (55000000h) ; UND .lword dummy | (55000000h) ; INTO .lword dummy ; BREAK .lword dummy | (55000000h) ; ADDRESS MATCH .lword dummy | (55000000h) ; SET SINGLE STEP .lword dummy | (55000000h) ; WDT .lword dummy | (55000000h) ; ADDRESS BREAK .lword dummy | (55000000h) ; RESERVE (Programming formats vary depending on the compiler. Check the compiler manual.)
33.4 33.4.1
Notes on Option Function Select Area Setting Example of Option Function Select Area
As the option function select area is allocated in the flash memory (not in the SFRs), they cannot be rewritten by executing an instruction. Write appropriate values when creating a program. The following shows a setting example.
* To set FFh in the OFS register
.org 00FFFCH .lword reset | (0FF000000h) ; RESET (Programming formats vary depending on the compiler. Check the compiler manual.)
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33.5 33.5.1
Notes on DTC DTC activation source
* Do not generate any DTC activation sources before entering wait mode or during wait mode. * Do not generate any DTC activation sources before entering stop mode or during stop mode.
33.5.2
DTCENi Registers (i = 0 to 3, 5, 6)
* Modify bits DTCENi0 to DTCENi1, and bits DTCENi3 to DTCENi7 only while an interrupt request
corresponding to the bit is not generated. * When the interrupt source flag in the status register for the peripheral function is 1, do not modify the corresponding activation source bit among bits DTCENi0 to DTCENi1, and bits DTCENi3 to DTCENi7. * Do not access the DTCENi registers using DTC transfers.
33.5.3
Peripheral Modules
* Do not set the status register bit for the peripheral function to 0 using a DTC transfer. * When the DTC activation source is I2C bus/SSU receive data full, read the SSRDR register/the ICDRR
register using a DTC transfer.
* When the DTC activation source is I2C bus/SSU transmit data empty, write to the SSTDR register/the ICDRT
register using a DTC transfer.
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33.6
Notes on Timer RA
* Timer RA stops counting after a reset. Set the values in the timer RA and timer RA prescalers before the count * *
starts. Even if the prescaler and timer RA are read out in 16-bit units, these registers are read 1 byte at a time by the MCU. Consequently, the timer value may be updated during the period when these two registers are being read. In pulse period measurement mode, bits TEDGF and TUNDF in the TRACR register can be set to 0 by writing 0 to these bits by a program. However, these bits remain unchanged if 1 is written. When using the READMODIFY-WRITE instruction for the TRACR register, the TEDGF or TUNDF bit may be set to 0 although these bits are set to 1 while the instruction is being executed. In this case, write 1 to the TEDGF or TUNDF bit which is not supposed to be set to 0 with the MOV instruction. When changing to pulse period measurement mode from another mode, the contents of bits TEDGF and TUNDF are undefined. Write 0 to bits TEDGF and TUNDF before the count starts. The TEDGF bit may be set to 1 by the first timer RA prescaler underflow generated after the count starts. When using the pulse period measurement mode, leave two or more periods of the timer RA prescaler immediately after the count starts, then set the TEDGF bit to 0. The TCSTF bit retains 0 (count stops) for 0 to 1 cycle of the count source after setting the TSTART bit to 1 (count starts) while the count is stopped. During this time, do not access registers associated with timer RA (1) other than the TCSTF bit. Timer RA starts counting at the first valid edge of the count source after The TCSTF bit is set to 1 (during count). The TCSTF bit remains 1 for 0 to 1 cycle of the count source after setting the TSTART bit to 0 (count stops) while the count is in progress. Timer RA counting is stopped when the TCSTF bit is set to 0. During this time, do not access registers associated with timer RA (1) other than the TCSTF bit. Note: 1. Registers associated with timer RA: TRACR, TRAIOC, TRAMR, TRAPRE, and TRA.
* * * *
* When the TRAPRE register is continuously written during count operation (TCSTF bit is set to 1), allow three or
more cycles of the count source clock for each write interval.
* When the TRA register is continuously written during count operation (TCSTF bit is set to 1), allow three or
more cycles of the prescaler underflow for each write interval.
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33.7
Notes on Timer RB
* Timer RB stops counting after a reset. Set the values in the timer RB and timer RB prescalers before the count
starts. * Even if the prescaler and timer RB is read out in 16-bit units, these registers are read 1 byte at a time by the MCU. Consequently, the timer value may be updated during the period when these two registers are being read. * In programmable one-shot generation mode and programmable wait one-shot generation mode, when setting the TSTART bit in the TRBCR register to 0, 0 (stops counting) or setting the TOSSP bit in the TRBOCR register to 1 (stops one-shot), the timer reloads the value of reload register and stops. Therefore, in programmable one-shot generation mode and programmable wait one-shot generation mode, read the timer count value before the timer stops. * The TCSTF bit remains 0 (count stops) for 1 to 2 cycles of the count source after setting the TSTART bit to 1 (count starts) while the count is stopped. During this time, do not access registers associated with timer RB (1) other than the TCSTF bit. Timer RB starts counting at the first valid edge of the count source after the TCSTF bit is set to 1 (during count). The TCSTF bit remains 1 for 1 to 2 cycles of the count source after setting the TSTART bit to 0 (count stops) while the count is in progress. Timer RB counting is stopped when the TCSTF bit is set to 0. During this time, do not access registers associated with timer RB (1) other than the TCSTF bit. Note: 1. Registers associated with timer RB: TRBCR, TRBOCR, TRBIOC, TRBMR, TRBPRE, TRBSC, and TRBPR.
* If the TSTOP bit in the TRBCR register is set to 1 during timer operation, timer RB stops immediately. * If 1 is written to the TOSST or TOSSP bit in the TRBOCR register, the value of the TOSSTF bit changes after
one or two cycles of the count source have elapsed. If the TOSSP bit is written to 1 during the period between when the TOSST bit is written to 1 and when the TOSSTF bit is set to 1, the TOSSTF bit may be set to either 0 or 1 depending on the content state. Likewise, if the TOSST bit is written to 1 during the period between when the TOSSP bit is written to 1 and when the TOSSTF bit is set to 0, the TOSSTF bit may be set to either 0 or 1.
33.7.1
Timer Mode
To write to registers TRBPRE and TRBPR during count operation (TCSTF bit in the TRBCR register is set to 1), note the following points: * When the TRBPRE register is written continuously, allow three or more cycles of the count source for each write interval. * When the TRBPR register is written continuously, allow three or more cycles of the prescaler underflow for each write interval.
33.7.2
Programmable Waveform Generation Mode
To write to registers TRBPRE and TRBPR during count operation (TCSTF bit in the TRBCR register is set to 1), note the following points: * When the TRBPRE register is written continuously, allow three or more cycles of the count source for each write interval. * When the TRBPR register is written continuously, allow three or more cycles of the prescaler underflow for each write interval.
33.7.3
Programmable One-shot Generation Mode
To write to registers TRBPRE and TRBPR during count operation (TCSTF bit in the TRBCR register is set to 1), note the following points: * When the TRBPRE register is written continuously during count operation (TCSTF bit is set to 1), allow three or more cycles of the count source for each write interval. * When the TRBPR register is written continuously during count operation (TCSTF bit is set to 1), allow three or more cycles of the prescaler underflow for each write interval.
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33.7.4
Programmable Wait One-shot Generation Mode
To write to registers TRBPRE and TRBPR during count operation (TCSTF bit in the TRBCR register is set to 1), note the following points: * When the TRBPRE register is written continuously, allow three or more cycles of the count source for each write interval. * When the TRBPR register is written continuously, allow three or more cycles of the prescaler underflow for each write interval.
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33.8 33.8.1
Notes on Timer RC TRC Register
* The following note applies when the CCLR bit in the TRCCR1 register is set to 1 (clear TRC register at
compare match with TRCGRA register). When using a program to write a value to the TRC register while the TSTART bit in the TRCMR register is set to 1 (count starts), ensure that the write does not overlap with the timing with which the TRC register is set to 0000h. If the timing of the write to the TRC register and the setting of the TRC register to 0000h coincide, the write value will not be written to the TRC register and the TRC register will be set to 0000h.
* Reading from the TRC register immediately after writing to it can result in the value previous to the write
being read out. To prevent this, execute the JMP.B instruction between the read and the write instructions. Program Example MOV.W #XXXXh, TRC ;Write JMP.B L1 ;JMP.B instruction L1: MOV.W TRC,DATA ;Read
33.8.2
TRCSR Register
Reading from the TRCSR register immediately after writing to it can result in the value previous to the write being read out. To prevent this, execute the JMP.B instruction between the read and the write instructions. Program Example MOV.B #XXh, TRCSR ;Write JMP.B L1 ;JMP.B instruction L1: MOV.B TRCSR,DATA ;Read
33.8.3
TRCCR1 Register
To set bits TCK2 to TCK0 in the TRCCR1 register to 111b (fOCO-F), set fOCO-F to the clock frequency higher than the CPU clock frequency.
33.8.4
Count Source Switching
* Stop the count before switching the count source.
Switching procedure (1) Set the TSTART bit in the TRCMR register to 0 (count stops). (2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register.
* After switching the count source from fOCO40M to another clock, allow a minimum of two cycles of f1 to
elapse after changing the clock setting before stopping fOCO40M. Switching procedure (1) Set the TSTART bit in the TRCMR register to 0 (count stops). (2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register. (3) Wait for a minimum of two cycles of f1. (4) Set the FRA00 bit in the FRA0 register to 0 (high-speed on-chip oscillator off).
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* After switching the count source from fOCO-F to fOCO40M, allow a minimum of two cycles of fOCO-F to
elapse after changing the clock setting before stopping fOCO-F. Switching procedure (1) Set the TSTART bit in the TRCMR register to 0 (count stops). (2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register. (3) Wait for a minimum of two cycles of fOCO-F. (4) Set the FRA00 bit in the FRA0 register to 0 (high-speed on-chip oscillator off).
* After switching the count source from fOCO-F to a clock other than fOCO40M, allow a minimum of one
cycle of fOCO-F + fOCO40M to elapse after changing the clock setting before stopping fOCO-F. Switching procedure (1) Set the TSTART bit in the TRCMR register to 0 (count stops). (2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register. (3) Wait for a minimum of one cycle of fOCO-F + fOCO40M. (4) Set the FRA00 bit in the FRA0 register to 0 (high-speed on-chip oscillator off).
33.8.5
Input Capture Function
* The pulse width of the input capture signal should be three cycles or more of the timer RC operation clock
(refer to Table 19.1 Timer RC Operation Clock).
* The value of the TRC register is transferred to the TRCGRj register one or two cycles of the timer RC
operation clock after the input capture signal is input to the TRCIOj (j = A, B, C, or D) pin (when the digital filter function is not used).
33.8.6
TRCMR Register in PWM2 Mode
When the CSEL bit in the TRCCR2 register is set to 1 (count stops at compare match with the TRCGRA register), do not set the TRCMR register at compare match timing of registers TRC and TRCGRA.
33.8.7
Count Source fOCO40M
The count source fOCO40M can be used with supply voltage VCC = 2.7 to 5.5 V. For supply voltage other than that, do not set bits TCK2 to TCK0 in the TRCCR1 register to 110b (select fOCO40M as the count source).
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33. Usage Notes
33.9 33.9.1
Notes on Timer RE Starting and Stopping Count
Timer RE has the TSTART bit for instructing the count to start or stop, and the TCSTF bit, which indicates count start or stop. Bits TSTART and TCSTF are in the TRECR1 register. Timer RE starts counting and the TCSTF bit is set to 1 (count starts) when the TSTART bit is set to 1 (count starts). It takes up to 2 cycles of the count source until the TCSTF bit is set to 1 after setting the TSTART bit to 1. During this time, do not access registers associated with timer RE (1) other than the TCSTF bit. Also, timer RE stops counting when setting the TSTART bit to 0 (count stops) and the TCSTF bit is set to 0 (count stops). It takes the time for up to 2 cycles of the count source until the TCSTF bit is set to 0 after setting the TSTART bit to 0. During this time, do not access registers associated with timer RE other than the TCSTF bit. Note: 1. Registers associated with timer RE: TRESEC, TREMIN, TREHR, TREWK, TRECR1, TRECR2, and TRECSR.
33.9.2
Register Setting
Write to the following registers or bits when timer RE is stopped. * Registers TRESEC, TREMIN, TREHR, TREWK, and TRECR2 * Bits H12_H24, PM, and INT in TRECR1 register * Bits RCS0 to RCS3 in TRECSR register Timer RE is stopped when bits TSTART and TCSTF in the TRECR1 register are set to 0 (timer RE stopped). Also, set all above-mentioned registers and bits (immediately before timer RE count starts) before setting the TRECR2 register. Figure 33.2 shows a Setting Example in Real-Time Clock Mode.
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TSTART in TRECR1 = 0
Stop timer RE operation TCSTF in TRECR1 = 0?
TREIC 00h (disable timer RE interrupt)
TRERST in TRECR1 = 1 Timer RE register and control circuit reset TRERST in TRECR1 = 0
Setting of registers TRECSR, TRESEC, TREMIN, TREHR, TREWK, and bits H12_H24, PM, and INT in TRECR1 register
Select clock output Select clock source Seconds, minutes, hours, days of week, operating mode Set a.m./p.m., interrupt timing
Setting of TRECR2 Setting of TREIC (IR bit 0, select interrupt priority level)
Select interrupt source
TSTART in TRECR1 = 1 Start timer RE operation TCSTF in TRECR1 = 1?
Figure 33.2
Setting Example in Real-Time Clock Mode
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33.9.3
Time Reading Procedure of Real-Time Clock Mode
In real-time clock mode, read registers TRESEC, TREMIN, TREHR, and TREWK when time data is updated and read the PM bit in the TRECR1 register when the BSY bit is set to 0 (not while data is updated). Also, when reading several registers, an incorrect time will be read if data is updated before another register is read after reading any register. In order to prevent this, use the reading procedure shown below.
* Using an interrupt
Read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the TRECR1 register in the timer RE interrupt routine.
* Monitoring with a program 1
Monitor the IR bit in the TREIC register with a program and read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the TRECR1 register after the IR bit in the TREIC register is set to 1 (timer RE interrupt request generated).
* Monitoring with a program 2
(1) Monitor the BSY bit. (2) Monitor until the BSY bit is set to 0 after the BSY bit is set to 1 (approximately 62.5 ms while the BSY bit is set to 1). (3) Read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the TRECR1 register after the BSY bit is set to 0.
* Using read results if they are the same value twice
(1) Read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the TRECR1 register. (2) Read the same register as (1) and compare the contents. (3) Recognize as the correct value if the contents match. If the contents do not match, repeat until the read contents match with the previous contents. Also, when reading several registers, read them as continuously as possible.
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33.10 Notes on Serial Interface (UART0)
* When reading data from the U0RB register either in clock synchronous serial I/O mode or in clock asynchronous
serial I/O mode, always read data in 16-bit units. When the high-order byte of the U0RB register is read, bits PER and FER in the U0RB register and the RI bit in the U0C1 register are set to 0. To check receive errors, read the U0RB register and then use the read data. Program example to read the receive buffer register: MOV.W 00A6H,R0 ; Read the U0RB register
* When writing data to the U0TB register in clock asynchronous serial I/O mode with 9-bit transfer data length,
write data to the high-order byte first and then the low-order byte, in 8-bit units. Program example to write to the transmit buffer register: MOV.B #XXH,00A3H ; Write to the high-order byte of the U0TB register MOV.B #XXH,00A2H ; Write to the low-order byte of the U0TB register
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33.11 Notes on Serial Interface (UART2) 33.11.1 Clock Synchronous Serial I/O Mode 33.11.1.1 Transmission/Reception
When the RTS function is used with an external clock, the RTS2 pin outputs "L," which informs the transmitting side that the MCU is ready for a receive operation. The RTS2 pin outputs "H" when a receive operation starts. Therefore, the transmit timing and receive timing can be synchronized by connecting the RTS2 pin to the CTS2 pin of the transmitting side. The RTS function is disabled when an internal clock is selected.
33.11.1.2 Transmission
If an external clock is selected, the following conditions must be met while the external clock is held high when the CKPOL bit in the U2C0 register is set to 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock), or while the external clock is held low when the CKPOL bit is set to 1 (transmit data output at the rising edge and receive data input at the falling edge of the transfer clock). * The TE bit in the U2C1 register = 1 (transmission enabled) * The TI bit in the U2C1 register = 0 (data present in the U2TB register) * If the CTS function is selected, input on the CTS2 pin = "L"
33.11.1.3 Reception
In clock synchronous serial I/O mode, the shift clock is generated by activating the transmitter. Set the UART2associated registers for transmit operation even if the MCU is used for receive operation only. Dummy data is output from the TXD2 pin while receiving. When an internal clock is selected, the shift clock is generated by setting the TE bit in the U2C1 register to 1 (transmission enabled) and placing dummy data in the U2TB register. When an external clock is selected, set the TE bit to 1 (transmission enabled), place dummy data in the U2TB register, and input an external clock to the CLK2 pin to generate the shift clock. If data is received consecutively, an overrun error occurs when the RE bit in the U2C1 register is set to 1 (data present in the U2RB register) and the next receive data is received in the UART2 receive register. Then, the OER bit in the U2RB register is set to 1 (overrun error). At this time, the U2RB register value is undefined. If an overrun error occurs, the IR bit in the S2RIC register remains unchanged. To receive data consecutively, set dummy data in the low-order byte in the U2TB register per each receive operation. If an external clock is selected, the following conditions must be met while the external clock is held high when the CKPOL bit is set to 0, or while the external clock is held low when the CKPOL bit is set to 1. * The RE bit in the U2C1 register = 1 (reception enabled) * The TE bit in the U2C1 register = 1 (transmission enabled) * The TI bit in the U2C1 register = 0 (data present in the U2TB register)
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33.11.2 Clock Asynchronous Serial I/O (UART) Mode 33.11.2.1 Transmission/Reception
When the RTS function is used with an external clock, the RTS2 pin outputs "L," which informs the transmitting side that the MCU is ready for a receive operation. The RTS2 pin outputs "H" when a receive operation starts. Therefore, the transmit timing and receive timing can be synchronized by connecting the RTS2 pin to the CTS2 pin of the transmitting side. The RTS function is disabled when an internal clock is selected.
33.11.2.2 Transmission
If an external clock is selected, the following conditions must be met while the external clock is held high when the CKPOL bit in the U2C0 register is set to 0 (transmit data output at the falling edge and receive data input at the rising edge of the transfer clock), or while the external clock is held low when the CKPOL bit is set to 1 (transmit data output at the rising edge and receive data input at the falling edge of the transfer clock). * The TE bit in the U2C1 register = 1 (transmission enabled) * The TI bit in the U2C1 register = 0 (data present in the U2TB register) * If the CTS function is selected, input on the CTS2 pin = "L"
33.11.3 Special Mode 1 (I2C Mode)
When generating start, stop, and restart conditions, set the STSPSEL bit in the U2SMR4 register to 0 and wait for more than half cycle of the transfer clock before changing each condition generation bit (STAREQ, RSTAREQ, and STPREQ) from 0 to 1.
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33.12 Notes on Synchronous Serial Communication Unit
Set the IICSEL bit in the SSUIICSR register to 0 (select SSU function) to use the synchronous serial communication unit function.
33.13 Notes on I2C bus Interface
To use the I2C bus interface, set the IICSEL bit in the SSUIICSR register to 1 (I2C bus interface function selected).
33.14 Notes on Hardware LIN
For the time-out processing of the header and response fields, use another timer to measure the duration of time with a Synch Break detection interrupt as the starting point.
33.15 Notes on A/D Converter
* Write to the ADMOD register, the ADINSEL register, the ADCON0 register (other than ADST bit), the
ADCON1 register, the OCVREFCR register when A/D conversion is stopped (before a trigger occurs).
* To use the A/D converter in repeat mode 0, repeat mode 1, or repeat sweep mode, select the frequency of the A/D
converter operating clock AD or more for the CPU clock during A/D conversion. Do not select fOCO-F as AD. Connect 0.1 F capacitor between the VREF pin and AVSS pin. Do not enter stop mode during A/D conversion. Do not enter wait mode during A/D conversion regardless of the state of the CM02 bit in the CM0 register (1: Peripheral function clock stops in wait mode or 0: Peripheral function clock does not stop in wait mode). Do not set the FMSTP bit in the FMR0 register to 1 (flash memory stops) during A/D conversion.
* * * *
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33.16 Notes on Flash Memory 33.16.1 CPU Rewrite Mode 33.16.1.1 Prohibited Instructions
The following instructions cannot be used while the program ROM area is being rewritten in EW0 mode because they reference data in the flash memory: UND, INTO, and BRK.
33.16.1.2 Non-Maskable Interrupts
Tables 33.1 and 33.2 show CPU Rewrite Mode Interrupts (1) and (2), respectively. Table 33.1
Mode EW0 Erase/ Write Target Data flash
CPU Rewrite Mode Interrupts (1)
Status During auto-erasure (suspend enabled) Maskable Interrupt * Address Match * Address Break (Note 1)
When an interrupt request is acknowledged, interrupt handling is executed. If the FMR22 bit is set to 1 (erase-suspend request enabled by interrupt request), the FMR21 bit is automatically set to 1 (erase-suspend request). The flash memory suspends auto-erasure after td(SR-SUS). If erase-suspend is required while the FMR22 bit is set to 0 (erase-suspend request disabled by interrupt request), set the FMR 21 bit to 1 during interrupt handling. The flash memory suspends auto-erasure after td(SR-SUS). While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure can be restarted by setting the FMR21 bit to 0 (erase restart). Interrupt handling is executed while auto-erasure or auto-programming is being performed.
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming Program During auto-erasure ROM (suspend enabled) During auto-erasure (suspend disabled) During auto-programming EW1 Data flash During auto-erasure (suspend enabled)
Usable by allocating a vector in RAM.
Not usable during auto-erasure or auto-programming.
When an interrupt request is acknowledged, interrupt handling is executed. If the FMR22 bit is set to 1, the FMR21 bit is automatically set to 1. The flash memory suspends auto-erasure after td(SR-SUS). If erase-suspend is required while the FMR22 bit is set to 0, set the FMR 21 bit to 1 during interrupt handling. The flash memory suspends auto-erasure after td(SR-SUS). While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure can be restarted by setting the FMR21 bit to 0. Interrupt handling is executed while auto-erasure or auto-programming is being performed.
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming Program During auto-erasure ROM (suspend enabled)
Auto-erasure suspends after td(SR-SUS) and interrupt handling is executed. Autoerasure can be restarted by setting the FMR21 bit to 0 after interrupt handling completes. While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure and auto-programming have priority and interrupt requests are put on standby. Interrupt handling is executed after auto-erase and auto-program complete.
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming
FMR21, FMR22: Bits in FMR2 register Note: 1. Do not use a non-maskable interrupt while block 0 is being auto-erased because the fixed vector is allocated in block 0.
REJ09B0458-0010 Rev.0.10 Page 563 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
33. Usage Notes
Table 33.2
Erase/ Write Target
CPU Rewrite Mode Interrupts (2)
* * * * * Watchdog Timer Oscillation Stop Detection Voltage Monitor 2 Voltage Monitor 1 NMI * * * * Undefined Instruction INTO Instruction BRK Instruction Single Step
Mode
Status
(Note 1)
(Note 1)
EW0
Data flash During auto-erasure (suspend enabled)
When an interrupt request is acknowledged, interrupt handling is executed. If the FMR22 bit is set to 1 (erase-suspend request enabled by interrupt request), the FMR21 bit is automatically set to 1 (erase-suspend request). The flash memory suspends auto-erasure after td(SR-SUS). If erase-suspend is required while the FMR22 bit is set to 0 (erase-suspend request disabled by interrupt request), set the FMR 21 bit to 1 during interrupt handling. The flash memory suspends auto-erasure after td(SR-SUS). While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure can be restarted by setting the FMR21 bit is set to 0 (erase restart). Interrupt handling is executed while auto-erasure or auto-programming is being performed.
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming Program ROM During auto-erasure (suspend enabled) During auto-erasure (suspend disabled) During auto-programming
Not usable during auto-erasure or When an interrupt request is acknowledged, auto-programming. auto-erasure or auto-programming is forcibly stopped immediately and the flash memory is reset. Interrupt handling starts when the flash memory restarts after the fixed period. Since the block during auto-erasure or the address during auto-programming is forcibly stopped, the normal value may not be read. After the flash memory restarts, execute auto-erasure again and ensure it completes normally. The watchdog timer does not stop during the command operation, so interrupt requests may be generated. Initialize the watchdog timer regularly using the erase-suspend function. When an interrupt request is acknowledged, interrupt handling is executed. If the FMR22 bit is set to 1, the FMR21 bit is automatically set to 1. The flash memory suspends auto-erasure after td(SR-SUS). If erase-suspend is required while the FMR22 bit is set to 0, set the FMR 21 bit to 1 during interrupt handling. The flash memory suspends auto-programming after td(SR-SUS). While auto-erasure is being suspended, any block other than the block during autoerasure execution can be read. Auto-erasure can be restarted by setting the FMR21 bit is set to 0. Interrupt handling is executed while auto-erasure or auto-programming is being performed.
EW1
Data flash During auto-erasure (suspend enabled)
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming Program ROM During auto-erasure (suspend enabled)
During auto-erasure (suspend disabled or FMR22 = 0) During auto-programming
Not usable during auto-erasure or When an interrupt request is acknowledged, auto-programming. auto-erasure or auto-programming is forcibly stopped immediately and the flash memory is reset. Interrupt handling starts when the flash memory restarts after the fixed period. Since the block during auto-erasure or the address during auto-programming is forcibly stopped, the normal value may not be read. After the flash memory restarts, execute auto-erasure again and ensure it completes normally. The watchdog timer does not stop during the command operation, so interrupt requests may be generated. Initialize the watchdog timer regularly using the erase-suspend function.
FMR21, FMR22: Bits in FMR2 register Note: 1. Do not use a non-maskable interrupt while block 0 is being auto-erased because the fixed vector is allocated in block 0.
REJ09B0458-0010 Rev.0.10 Page 564 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
33. Usage Notes
33.16.1.3 How to Access
To set one of the following bits to 1, first write 0 and then 1 immediately. Do not generate an interrupt between writing 0 and writing 1. * The FMR01 bit or FMR02 bit in the FMR0 register * The FMR13 bit in the FMR1 register * The FMR20 bit, FMR22 bit, or FMR 27 bit in the FMR2 register To set one of the following bits to 0, first write 1 and then 0 immediately. Do not generate an interrupt between writing 1 and writing 0. * The FMR14 bit, FMR15 bit, FMR16 bit, or FMR17 bit in the FMR1 register
33.16.1.4 Rewriting User ROM Area
In EW0 Mode, if the supply voltage drops while rewriting any block in which a rewrite control program is stored, it may not be possible to rewrite the flash memory because the rewrite control program cannot be rewritten correctly. In this case, use standard serial I/O mode.
33.16.1.5 Programming
Do not write additions to the already programmed address.
33.16.1.6 Entering Stop Mode or Wait Mode
Do not enter stop mode or wait mode during erase-suspend. If the FST7 in the FST register is set to 0 (busy (during programming or erasure execution), do not enter to stop mode or wait mode.
33.16.1.7 Programming and Erasure Voltage for Flash Memory
To perform programming and erasure, use VCC = 2.7 V to 5.5 V as the supply voltage. Do not perform programming and erasure at less than 2.7 V.
REJ09B0458-0010 Rev.0.10 Page 565 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
33. Usage Notes
33.17 Notes on Noise 33.17.1 Inserting a Bypass Capacitor between VCC and VSS Pins as a Countermeasure against Noise and Latch-up
Connect a bypass capacitor (at least 0.1 F) using the shortest and thickest write possible.
33.17.2 Countermeasures against Noise Error of Port Control Registers
During rigorous noise testing or the like, external noise (mainly power supply system noise) can exceed the capacity of the MCU's internal noise control circuitry. In such cases the contents of the port related registers may be changed. As a firmware countermeasure, it is recommended that the port registers, port direction registers, and pull-up control registers be reset periodically. However, examine the control processing fully before introducing the reset routine as conflicts may be created between the reset routine and interrupt routines.
REJ09B0458-0010 Rev.0.10 Page 566 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
34. Notes on On-Chip Debugger
34. Notes on On-Chip Debugger
When using the on-chip debugger to develop and debug programs for the R8C/32A Group, take note of the following: (1) Some of the user flash memory and RAM areas are used by the on-ship debugger. These areas cannot be accessed by the user. Refer to the on-chip debugger manual for which areas are used. (2) Do not set the address match interrupt (registers AIER0, AIER1, RMAD0, and RMAD1 and fixed vector tables) in a user system. (3) Do not use the BRK instruction in a user system. (4) Debugging is available under the condition of supply voltage VCC = 1.8 to 5.5 V. Set the supply voltage to 2.7 V or above for rewriting the flash memory. Connecting and using the on-chip debugger has some special restrictions. Refer to the on-chip debugger manual for details.
REJ09B0458-0010 Rev.0.10 Page 567 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
Appendix 1. Package Dimensions
Appendix 1. Package Dimensions
Diagrams showing the latest package dimensions and mounting information are available in the "Packages" section of the Renesas Technology website.
JEITA Package Code P-LSSOP20-4.4x6.5-0.65 RENESAS Code PLSP0020JB-A Previous Code 20P2F-A MASS[Typ.] 0.1g
20
11
HE
*1
E
F
NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET.
1
Index mark
10
c
A2
A1
*2
D
Reference Symbol
Dimension in Millimeters
e y
*3
bp Detail F
D E A2 A A1 bp c HE e y L
Nom Max 6.5 6.6 4.4 4.5 1.15 1.45 0.1 0.2 0 0.17 0.22 0.32 0.13 0.15 0.2 0 10 6.2 6.4 6.6 0.53 0.65 0.77 0.10 0.3 0.5 0.7
REJ09B0458-0010 Rev.0.10 Page 568 of 572
A
Apr 01, 2008
L
Min 6.4 4.3
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
Appendix 2. Connection Examples between Serial Writer and On-Chip Debugging Emulator
Appendix 2. Connection Examples between Serial Writer and On-Chip Debugging Emulator
Appendix Figure 2.1 shows a Connection Example with M16C Flash Starter (M3A-0806) and Appendix Figure 2.2 shows a Connection Example with E8a Emulator (R0E00008AKCE00).
VCC TXD
1
20 19 18 17 16 15 14 13 12 11
MODE RESET Connect oscillation circuit (1)
2
R8C/32A Group
3 4 5 6 7 8 9 10
VSS
10 TXD 7 VSS
RXD 4 1 VCC
M16C Flash Starter (M3A-0806)
RXD Note: 1. An oscillation circuit must be connected, even when operating with the on-chip oscillator clock.
Appendix Figure 2.1
Connection Example with M16C Flash Starter (M3A-0806)
VCC Open collector buffer 4.7k or more User logic
1 2 20 19 18 17 16 15 14 13 12 11
R8C/32A Group
Connect oscillation circuit (1) VSS
3 4 5 6
14 12 10 8 VCC 6 4 2 VSS
13 RESET
4.7k 10% MODE
7 8 9 10
7 MODE
E8a emulator (R0E00008AKCE00)
Note: 1. It is not necessary to connect an oscillation circuit when operating with the on-chip oscillator clock.
Appendix Figure 2.2
Connection Example with E8a Emulator (R0E00008AKCE00)
REJ09B0458-0010 Rev.0.10 Page 569 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
Appendix 3. Example of Oscillation Evaluation Circuit
Appendix 3. Example of Oscillation Evaluation Circuit
Appendix Figure 3.1 shows an Example of Oscillation Evaluation Circuit.
VCC
1 2
20 19 18 17 16 15 14 13 12 11
RESET Connect oscillation circuit
3 4
R8C/32A Group
VSS
5 6 7 8 9 10
Note: 1. After reset, the XIN and XCIN clocks are stopped. Write a program to oscillate the XIN and XCIN clocks.
Appendix Figure 3.1
Example of Oscillation Evaluation Circuit
REJ09B0458-0010 Rev.0.10 Page 570 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
Index
Index
[A] ADCON0 ............................................................................. 438 ADCON1 ............................................................................. 439 ADi (i = 0 to 7) ..................................................................... 435 ADIC .................................................................................... 126 ADINSEL ............................................................................. 437 ADMOD ............................................................................... 436 AIERi (i = 0 or 1) .................................................................. 142 [C] CM0 ....................................................................................... 92 CM1 ....................................................................................... 93 CM3 ....................................................................................... 94 CMPA ............................................................................ 41, 458 CPSRF .................................................................................. 97 CSPR .................................................................................. 159 [D] DRR0 .................................................................................... 74 DRR1 .................................................................................... 75 DTBLS ................................................................................. 167 DTCCR ................................................................................ 167 DTCCT ................................................................................ 168 DTCENi (i = 0 to 3, 5, 6) ...................................................... 169 DTCTL ................................................................................. 170 DTDAR ................................................................................ 168 DTRLD ................................................................................ 168 DTSAR ................................................................................ 168 [F] FMR0 .................................................................................. 485 FMR1 .................................................................................. 487 FMR2 .................................................................................. 489 FMRDYIC ............................................................................ 127 FRA0 ..................................................................................... 96 FRA1 ..................................................................................... 96 FRA2 ..................................................................................... 97 FRA3 ..................................................................................... 98 FRA4 ..................................................................................... 98 FRA5 ..................................................................................... 98 FRA6 ..................................................................................... 98 FRA7 ..................................................................................... 95 FST ..................................................................................... 483 [I] ICCR1 ................................................................................. 388 ICCR2 ................................................................................. 389 ICDRR ................................................................................. 387 ICDRS ................................................................................. 393 ICDRT ................................................................................. 387 ICIER ................................................................................... 391 ICMR ................................................................................... 390 ICSR .................................................................................... 392 INTCMP .............................................................................. 473 INTEN ......................................................................... 137, 473 INTF ............................................................................ 137, 474 INTiIC (i = 0, 1, 3) ................................................................ 128 INTSR ........................................................................... 71, 136 [K] KIEN .................................................................................... 140 KUPIC ................................................................................. 126 [L] LINCR .................................................................................. 420 LINCR2 ................................................................................ 419 LINST .................................................................................. 420 [M] MSTCR ................................................................ 224, 355, 386 [O] OCD ....................................................................................... 95 OCVREFCR ........................................................................ 434 OFS ......................................................... 29, 48, 153, 160, 481 OFS2 ..................................................................... 30, 154, 161 [P] P1DRR .................................................................................. 73 PDi (i = 1, 3, 4) ...................................................................... 65 Pi (i = 1, 3, 4) ......................................................................... 66 PM0 ....................................................................................... 28 PM1 ..................................................................................... 158 PRCR .................................................................................. 120 PUR0 ..................................................................................... 72 PUR1 ..................................................................................... 72 [R] RMADi (i = 0 or 1) ................................................................ 142 RSTFR ................................................................................... 28 [S] S0RIC .................................................................................. 126 S0TIC .................................................................................. 126 S2RIC .................................................................................. 126 S2TIC .................................................................................. 126 SAR ..................................................................................... 393 SSBR ................................................................................... 356 SSCRH ................................................................................ 357 SSCRL ................................................................................. 358 SSER ................................................................................... 360 SSMR .................................................................................. 359 SSMR2 ................................................................................ 362 SSRDR ................................................................................ 357 SSSR ................................................................................... 361 SSTDR ................................................................................ 356 SSUIC/IICIC ........................................................................ 127 SSUIICSR .............................................................. 71, 355, 386 [T] TRA ..................................................................................... 187 TRACR ................................................................................ 185 TRAIC .................................................................................. 126 TRAIOC ....................................... 185, 188, 191, 193, 195, 198 TRAMR ................................................................................ 186 TRAPRE .............................................................................. 186 TRASR .......................................................................... 67, 187 TRBCR ................................................................................ 202 TRBIC .................................................................................. 126 TRBIOC ............................................... 203, 206, 210, 213, 217 TRBMR ................................................................................ 203 TRBOCR ............................................................................. 202 TRBPR ................................................................................ 205 TRBPRE .............................................................................. 204 TRBRCSR ..................................................................... 67, 231
REJ09B0458-0010 Rev.0.10 Page 571 of 572
Apr 01, 2008
Under development
Preliminary specification Specifications in this manual are tentative and subject to change.
R8C/32A Group
Index
TRBSC ................................................................................ 204 TRC ..................................................................................... 228 TRCADCR ........................................................................... 230 TRCCR1 ...................................................... 225, 246, 254, 260 TRCCR2 .............................................................. 229, 254, 261 TRCDF ........................................................................ 229, 261 TRCGRA ............................................................................. 228 TRCGRB ............................................................................. 228 TRCGRC ............................................................................. 228 TRCGRD ............................................................................. 228 TRCIC ................................................................................. 127 TRCIER ............................................................................... 225 TRCIOR0 ............................................................ 227, 241, 247 TRCIOR1 ............................................................ 227, 242, 248 TRCMR ............................................................................... 224 TRCOER ............................................................................. 230 TRCPSR0 ..................................................................... 68, 232 TRCPSR1 ..................................................................... 68, 232 TRCSR ................................................................................ 226 TRECR1 ...................................................................... 274, 281 TRECR2 ...................................................................... 275, 281 TRECSR ..................................................................... 276, 282 TREHR ................................................................................ 273 TREIC ................................................................................. 126 TREMIN ...................................................................... 272, 280 TRESEC ...................................................................... 272, 280 TREWK ............................................................................... 273 [U] U0BRG ................................................................................ 289 U0C0 ................................................................................... 291 U0C1 ................................................................................... 291 U0MR .................................................................................. 289 U0RB ................................................................................... 292 U0SR ............................................................................. 69, 293 U0TB ................................................................................... 290 U2BCNIC ............................................................................ 126 U2BRG ................................................................................ 309 U2C0 ................................................................................... 311 U2C1 ................................................................................... 312 U2MR .................................................................................. 309 U2RB ................................................................................... 313 U2SMR ................................................................................ 316 U2SMR2 .............................................................................. 316 U2SMR3 .............................................................................. 315 U2SMR4 .............................................................................. 315 U2SMR5 .............................................................................. 314 U2SR0 ........................................................................... 70, 317 U2SR1 ........................................................................... 70, 317 U2TB ................................................................................... 310 URXDF ................................................................................ 314 [V] VCA1 ............................................................................. 42, 459 VCA2 ....................................................................... 43, 99, 460 VCAC ............................................................................ 42, 458 VCMP1IC ............................................................................ 126 VCMP2IC ............................................................................ 126 VD1LS ................................................................................... 44 VLT0 ...................................................................................... 76 VLT1 ...................................................................................... 76 VW0C .................................................................................... 45 VW1C ............................................................................ 46, 461 VW2C ............................................................................ 47, 462
[W] WDTC .................................................................................. 159 WDTR .................................................................................. 158 WDTS .................................................................................. 158
REJ09B0458-0010 Rev.0.10 Page 572 of 572
Apr 01, 2008
REVISION HISTORY REVISION HISTORY
Rev. 0.10 Date Apr 01, 2008
R8C/32A Group Hardware Manual R8C/32A Group Hardware Manual
Description
Page
-
Summary First Edition issued
C-1
R8C/32A Group Hardware Manual Publication Date: Rev.0.10 Apr 01, 2008
Published by:
Sales Strategic Planning Div. Renesas Technology Corp.
(c) 2008. Renesas Technology Corp., All rights reserved. Printed in Japan
R8C/32A Group Hardware Manual
2-6-2, Ote-machi, Chiyoda-ku, Tokyo, 100-0004, Japan

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