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MOTOROLA
SEMICONDUCTOR
TECHNICAL DATA
Order this document by MC68HC11A8TS/D
MC68HC11A8 MC68HC11A1 MC68HC11A0
Technical Summary 8-Bit Microcontrollers
1 Introduction
The MC68HC11A8, MC68HC11A1, and MC68HC11A0 high-performance microcontroller units (MCUs) are based on the M68HC11 Family. These high speed, low power consumption chips have multiplexed buses and a fully static design. The chips can operate at frequencies from 3 MHz to dc. The three MCUs are created from the same masks; the only differences are the value stored in the CONFIG register, and whether or not the ROM or EEPROM is tested and guaranteed. For detailed information about specific characteristics of these MCUs, refer to the M68HC11 Reference Manual (M68HC11RM/AD). 1.1 Features * M68HC11 CPU * Power Saving STOP and WAIT Modes * 8 Kbytes ROM * 512 Bytes of On-Chip EEPROM * 256 Bytes of On-Chip RAM (All Saved During Standby) * 16-Bit Timer System -- 3 Input Capture Channels -- 5 Output Compare Channels * 8-Bit Pulse Accumulator * Real-Time Interrupt Circuit * Computer Operating Properly (COP) Watchdog System * Synchronous Serial Peripheral Interface (SPI) * Asynchronous Nonreturn to Zero (NRZ) Serial Communications Interface (SCI) * 8-Channel, 8-Bit Analog-to-Digital (A/D) Converter * 38 General-Purpose Input/Output (I/O) Pins -- 15 Bidirectional I/O Pins -- 11 Input-Only Pins and 12 Output-Only Pins (Eight Output-Only Pins in 48-Pin Package) * Available in 48-Pin Dual In-Line Package (DIP) or 52-Pin Plastic Leaded Chip Carrier (PLCC)
This document contains information on a new product. Specifications and information herein are subject to change without notice.
(c) MOTOROLA INC., 1991, 1996
Table 1 MC68HC11Ax Family Members
Device Number MC68HC11A8 MC68HC11A1 MC68HC11A0 ROM 8K 0 0 EEPROM 512 512 0 RAM 256 256 256 CONFIG* $0F $0D $0C Comments Family built around this device ROM disabled ROM and EEPROM disabled
Table 2 Ordering Information
Package 48-Pin Plastic DIP (P suffix) Temperature -40to + 85C -40to + 85C -40to + 105C -40to + 125C -40to + 85C -40to + 105C -40to + 125C -40to + 85C 52-Pin PLCC (FN suffix) -40to + 85C -40to + 85C -40to + 105C -40to + 125C -40to + 85C -40to + 105C -40to + 125C -40to + 85C CONFIG $0F $0D $0D $0D $09 $09 $09 $0C $0F $0D $0D $0D $09 $09 $09 $0C Description BUFFALO ROM No ROM No ROM No ROM No ROM, COP On No ROM, COP On No ROM, COP On No ROM, No EEPROM BUFFALO ROM No ROM No ROM No ROM No ROM, COP On No ROM, COP On No ROM, COP On No ROM, No EEPROM MC Order Number MC68HC11A8P1 MC68HC11A1P MC68HC11A1VP MC68HC11A1MP MC68HCP11A1P MC68HCP11A1VP MC68HCP11A1MP MC68HC11A0P MC68HC11A8FN1 MC68HC11A1FN MC68HC11A1VFN MC68HC11A1MFN MC68HCP11A1FN MC68HCP11A1VFN MC68HCP11A1MFN MC68HC11A0FN
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MC68HC11A8 MC68HC11A8TS/D
TABLE OF CONTENTS
Section Page
1 Introduction...............................................................................................................................................1 1.1 Features ..........................................................................................................................................1 2 Operating Modes and Memory Maps .......................................................................................................6 2.1 Memory Maps ..................................................................................................................................7 3 Resets and Interrupts .............................................................................................................................13 4 Electrically Erasable Programmable Read-Only Memory (EEPROM) ...................................................17 5 Parallel Input/Output...............................................................................................................................19 6 Serial Communications Interface (SCI) ..................................................................................................23 7 Serial Peripheral Interface (SPI).............................................................................................................29 8 Main Timer..............................................................................................................................................32 9 Pulse Accumulator..................................................................................................................................38 10 Analog-to-Digital Converter ..................................................................................................................41
MC68HC11A8 MC68HC11A8TS/D
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XTAL EXTAL E PA7 PA6 PA5 PA4 PA3 PA2 PA1 PA0 PULSE PAI/OC1 ACCUMULATOR OC2/OC1 OC3/OC1 OC4/OC1 OC5/OC1 IC1 IC2 IC3 PORT A TIMER SYSTEM COP OSCILLATOR INTERRUPT LOGIC IRQ XIRQ RESET MODA/ LIR MODB/ VSTBY VRH VRL PE7 PE6 PE5 PE4 PE3 PE2 PE1 PE0 VDD VSS
POWER
PERIODIC INTERRUPT
MODE SELECT
CPU SINGLE CHIP PB7 PB6 PB5 PB4 PB3 PB2 PB1 PB0 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 STRB STRA PARALLEL I/O EQUIVALENT TO MC68HC24
A/D CONVERTER AN7 AN6 AN5 AN4 AN3 AN2 AN1 AN0
EXPANDED A15 A14 A13 A12 A11 A10 A9 A8 A7/D7 A6/D6 A5/D5 A4/D4 A3/D3 A2/D2 A1/D1 A0/D0 R/W AS
PORT B
256 BYTES RAM ADDRESS/DATA BUS HANDSHAKE I/O
512 BYTES EEPROM SPI
PORT E
PORT C PORT C DDR
8 KBYTES ROM SCI
PORT D DDR PORT D
SS SCK MOSI MISO
PD5 PD4 PD3 PD2
TxD RxD
PD1 PD0
Figure 1 MC68HC11A8 Block Diagram
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MC68HC11A8 MC68HC11A8TS/D
EXTAL STRB/R/W E STRA/AS MODA/LIR MODB/VSTBY VSS VRH VRL 8 9 10 11 12 13 14 15 16 17 18 19 20 7 6 5 4 3 2
52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34
XTAL PC0/A0/D0 PC1/A1/D1 PC2/A2/D2 PC3/A3/D3 PC4/A4/D4 PC5/A5/D5 PC6/A6/D6 PC7/A7/D7 RESET XIRQ IRQ PD0/RxD
PE7/AN7 PE3/AN3 PE6/AN6 PE2/AN2
1
PE5/AN5 PE1/AN1 PE4/AN4 PE0/AN0 PB0/A8 PB1/A9 PB2/A10 PB3/A11 PB4/A12 PB5/A13 PB6/A14 PB7/A15 PA0/IC3
Figure 2 52-Pin PLCC Pin Assignments
MC68HC11A8 MC68HC11A8TS/D
PA7/PAI/OC1 PA6/OC2/OC1 PA5/OC3/OC1 PA4/OC4/OC1 PA3/OC5/OC1 PA2/IC1 PA1/IC2
PD1/TxD PD2/MISO PD3/MOSI PD4/SCK PD5/SS VDD
21 22 23 24 25 26 27 28 29 30 31 32 33
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PA7/PAI/OC1 PA6/OC2/OC1 PA5/OC3/OC1 PA4/OC4/OC1 PA3/OC5/OC1 PA2/IC1 PA1/IC2 PA0/IC3 PB7/A15 PB6/A14 PB5/A13 PB4/A12 PB3/A11 PB2/A10 PB1/A9 PB0/A8 PE0/AN0 PE1/AN1 PE2/AN2 PE3/AN3 VRL VRH VSS MODB/VSTBY
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
VDD PD5/SS PD4/SCK PD3/MOSI PD2/MISO PD1/TxD PD0/RxD IRQ XIRQ RESET PC7/A7/D7 PC6/A6/D6 PC5/A5/D5 PC4/A4/D4 PC3/A3/D3 PC2/A2/D2 PC1/A1/D1 PC0/A0/D0 XTAL EXTAL STRB/ R/W E STRA/AS MODA/LIR
Figure 3 48-Pin DIP Pin Assignments
2 Operating Modes and Memory Maps
In single-chip operating mode, the MC68HC11A8 is a monolithic microcontroller without external address or data buses. In expanded multiplexed operating mode, the MCU can access a 64 Kbyte address space. The space includes the same on-chip memory addresses used for single-chip mode plus external peripheral and memory devices. The expansion bus is made up of ports B and C and control signals AS and R/W. The address, R/W, and AS signals are active and valid for all bus cycles including accesses to internal memory locations. The following figure illustrates a recommended method of demultiplexing low-order addresses from data at port C.
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MC68HC11A8 MC68HC11A8TS/D
PB7 PB6 PB5 PB4 PB3 PB2 PB1 PB0 MC68HC11A8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 AS MC54/74HC373 D1 D2 D3 D4 D5 D6 D7 D8 LE Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 OE
A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
R/W E
WE
D7 D6 D5 D4 D3 D2 D1 D0
Figure 4 Address/Data Demultiplexing Special bootstrap mode allows special purpose programs to be entered into internal RAM. The bootloader program uses the SCI to read a 256-byte program into on-chip RAM at $0000 through $00FF. After receiving the character for address $00FF, control passes to the loaded program at $0000. Special test mode is used primarily for factory testing. 2.1 Memory Maps Memory locations are the same for expanded multiplexed and single-chip modes. The on-board 256byte RAM is initially located at $0000 after reset. The 64-byte register block originates at $1000 after reset. RAM and/or the register block can be placed at any other 4K boundary ($x000) after reset by writing an appropriate value to the INIT register. The 512-byte EEPROM is located at $B600 through $B7FF after reset if it is enabled. The 8 Kbyte ROM is located at $E000 through $FFFF if it is enabled. Hardware priority is built into the memory remapping. Registers have priority over RAM, and RAM has priority over ROM. The higher priority resource covers the lower, making the underlying locations inaccessible. In special bootstrap mode, a bootloader ROM is enabled at locations $BF40 through $BFFF. In special test and special bootstrap modes, reset and interrupt vectors are located at $BFC0 through $BFFF.
MC68HC11A8 MC68HC11A8TS/D
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$0000 EXT $1000 EXT
0000 00FF 1000
256 BYTES RAM (CAN BE REMAPPED TO ANY 4K PAGE BY THE INIT REGISTER) 64 BYTE REGISTER BLOCK (CAN BE REMAPPED TO ANY 4K PAGE BY THE INIT REGISTER)
103F EXT EXT B600 $B600 B7FF BF40 EXT EXT BFFF E000 $E000
512 BYTES EEPROM
BOOT ROM
BFC0
BFFF 8K ROM FFC0
SPECIAL MODE INTERRUPT VECTORS
$FFFF SINGLE CHIP EXPANDED MUX SPECIAL BOOTSTRAP SPECIAL TEST
FFFF
FFFF
NORMAL MODE INTERRUPT VECTORS
Figure 5 Memory Map
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MC68HC11A8 MC68HC11A8TS/D
Table 3 MC68HC11A8 Register and Control Bit Assignments (Sheet 1 of 2) (The register block can be remapped to any 4K boundary.)
Bit 7 $1000 $1001 $1002 $1003 $1004 $1005 $1006 $1007 $1008 $1009 $100A $100B $100C $100D $100E $100F $1010 $1011 $1012 $1013 $1014 $1015 $1016 $1017 $1018 $1019 $101A $101B $101C $101D $101E $101F $1020 $1021 $1022 $1023 $1024 $1025 DDC7 0 0 PE7 FOC1 OC1M7 OC1D7 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 OM2 0 OC1I OC1F TOI TOF DDC6 0 0 PE6 FOC2 OC1M6 OC1D6 14 6 14 6 14 6 14 6 14 6 14 6 14 6 14 6 14 6 OL2 0 OC2I OC2F RTII RTIF DDC5 PD5 DDD5 PE5 FOC3 OC1M5 OC1D5 13 5 13 5 13 5 13 5 13 5 13 5 13 5 13 5 13 5 OM3 EDG1B OC3I OC3F PAOVI PAOVF DDC4 PD4 DDD4 PE4 FOC4 OC1M4 OC1D4 12 4 12 4 12 4 12 4 12 4 12 4 12 4 12 4 12 4 OL3 EDG1A OC4I OC4F PAII PAIF DDC3 PD3 DDD3 PE3 FOC5 OC1M3 OC1D3 11 3 11 3 11 3 11 3 11 3 11 3 11 3 11 3 11 3 OM4 EDG2B OC5I OC5F 0 0 DDC2 PD2 DDD2 PE2 0 0 0 10 2 10 2 10 2 10 2 10 2 10 2 10 2 10 2 10 2 OL4 EDG2A IC1I IC1F 0 0 DDC1 PD1 DDD1 PE1 0 0 0 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 9 1 OM5 EDG3B IC2I IC2F PR1 0 DDC0 PD0 DDD0 PE0 0 0 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 OL5 EDG3A IC3I IC3F PR0 0 STAF PC7 PB7 PCL7 STAI PC6 PB6 PCL6 CWOM PC5 PB5 PCL5 HNDS PC4 PB4 PCL4 OIN PC3 PB3 PCL3 PLS PC2 PB2 PCL2 EGA PC1 PB1 PCL1 INVB PC0 PB0 PCL0 PA7 6 PA6 5 PA5 4 PA4 3 PA3 2 PA2 1 PA1 Bit 0 PA0 PORTA Reserved PIOC PORTC PORTB PORTCL Reserved DDRC PORTD DDRD PORTE CFORC OC1M OC1D TCNT (High) TCNT (Low) TIC1 (High) TIC1 (Low) TIC2 (High) TIC2 (Low) TIC3 (High) TIC3 (Low) TOC1(High) TOC1 (Low) TOC2 (High) TOC2 (Low) TOC3 (High) TOC3 (Low) TOC4 (High) TOC4 (Low) TOC5 (High) TOC5 (Low) TCTL1 TCTL2 TMSK1 TFLG1 TMSK2 TFLG2
MC68HC11A8 MC68HC11A8TS/D
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Table 3 MC68HC11A8 Register and Control Bit Assignments (Sheet 2 of 2) (The register block can be remapped to any 4K boundary.)
Bit 7 $1026 $1027 $1028 $1029 $102A $102B $102C $102D $102E $102F $1030 $1031 $1032 $1033 $1034 $1035 $1038 $1039 $103A $103B $103C $103D $103E $103F ADPU Bit 7 ODD RBOOT RAM3 TILOP 0 CSEL 6 EVEN SMOD RAM2 0 0 IRQE 5 0 MDA RAM1 OCCR 0 DLY 4 BYTE IRV RAM0 CBYP 0 CME 3 ROW PSEL3 REG3 DISR NOSEC 0 2 ERASE PSEL2 REG2 FCM NOCOP CR1 1 EELAT PSEL1 REG1 FCOP ROMON CR0 Bit 0 EEPGM PSEL0 REG0 TCON EEON DDRA7 Bit 7 SPIE SPIF Bit 7 TCLR R8 TIE TDRE R7/T7 CCF Bit 7 Bit 7 Bit 7 Bit 7 6 PAEN 6 SPE WCOL 6 0 T8 TCIE TC R6/T6 0 6 6 6 6 5 PAMOD 5 DWOM 0 5 SCP1 0 RIE RDRF R5/T5 SCAN 5 5 5 5 4 PEDGE 4 MSTR MODF 4 SCP0 M ILIE IDLE R4/T4 MULT 4 4 4 4 3 0 3 CPOL 0 3 RCKB WAKE TE OR R3/T3 CD 3 3 3 3 2 0 2 CPHA 0 2 SCR2 0 RE NF R2/T2 CC 2 2 2 2 1 RTR1 1 SPR1 0 1 SCR1 0 RWU FE R1/T1 CB 1 1 1 1 Bit 0 RTR0 Bit 0 SPR0 0 Bit 0 SCR0 0 SBK 0 R0/T0 CA Bit 0 Bit 0 Bit 0 Bit 0 PACTL PACNT SPCR SPSR SPDR BAUD SCCR1 SCCR2 SCSR SCDR ADCTL ADR1 ADR2 ADR3 ADR4 Reserved Reserved OPTION COPRST PPROG HPRIO INIT TEST1 CONFIG
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MC68HC11A8 MC68HC11A8TS/D
HPRIO -- Highest Priority I-Bit Interrupt and Miscellaneous
Bit 7 RBOOT RESET: -- 6 SMOD -- 5 MDA -- 4 IRV -- 3 PSEL3 0 2 PSEL2 1 1 PSEL1 0
$103C
Bit 0 PSEL0 1
RBOOT, SMOD, and MDA reset depend on conditions at reset and can only be written in special modes (SMOD = 1). RBOOT -- Read Bootstrap ROM 0 = Bootloader ROM disabled and not in map 1 = Bootloader ROM enabled and in map at $BF40-$BFFF SMOD --Special Mode Select MDA -- Mode Select A
Inputs MODB 1 1 0 0 MODA 0 1 0 1 Single Chip Expanded Multiplexed Special Bootstrap Special Test Mode RBOOT 0 0 1 0 Latched at Reset SMOD 0 0 1 1 MDA 0 1 0 1
IRV -- Internal Read Visibility 0 = No internal read visibility on external bus 1 = Data from internal reads is driven out through the external data bus PSEL3-PSEL0 -- Priority Select Bits 3 through 0 Refer to 3 Resets and Interrupts. INIT -- RAM and I/O Mapping
Bit 7 RAM3 RESET: 0 6 RAM2 0 5 RAM1 0 4 RAM0 0 3 REG3 0 2 REG2 0 1 REG1 0
$103D
Bit 0 REG0 1
RAM[3:0] --256-Byte Internal RAM Map Position RAM[3:0] determine the upper four bits of the RAM address, positioning RAM at the selected 4K boundary. REG[3:0] --64-Byte Register Block Map Position REG[3:0] determine the upper four bits of the register address, positioning registers at the selected 4K boundary. Register can be written only once in the first 64 cycles out of reset in normal modes, or any time in special modes.
MC68HC11A8 MC68HC11A8TS/D
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TEST1 -- Factory Test
Bit 7 TILOP RESET: 0 6 0 0 5 OCCR 0 4 CBYP 0 3 DISR -- 2 FCM 0 1 FCOP 0
$103E
Bit 0 TCON 0
Test Modes Only TILOP -- Test Illegal Opcode OCCR -- Output Condition Code Register to Timer Port CBYP -- Timer Divider Chain Bypass DISR -- Disable Resets from COP and Clock Monitor DISR is forced to one out of reset in special test and bootstrap modes. FCM -- Force Clock Monitor Failure FCOP -- Force COP Watchdog Failure TCON -- Test Configuration Register CONFIG -- COP, ROM, EEPROM Enables
Bit 7 0 RESET: 0 6 0 0 5 0 0 4 0 0 3 NOSEC -- 2 -- 1 -- NOCOP ROMON
$103F
Bit 0 EEON --
NOTE The bits of this register are implemented with EEPROM cells. Programming and erasing follow normal EEPROM procedures. The erased state of CONFIG is $0F. A new value is not readable until after a subsequent reset sequence. CONFIG can only be programmed or erased in special modes. NOSEC -- EEPROM Security Disable Refer to 4 Electrically Erasable Programmable Read-Only Memory (EEPROM). NOCOP -- COP System Disable Refer to 3 Resets and Interrupts. ROMON -- ROM Enable In single-chip mode, ROMON is forced to one out of reset. 0 = 8K ROM removed from the memory map 1 = 8K ROM present in the memory map EEON -- EEPROM Enable 0 = EEPROM is removed from the memory map 1 = EEPROM is present in the memory map
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MC68HC11A8 MC68HC11A8TS/D
3 Resets and Interrupts
The MC68HC11A8 has three reset vectors and 18 interrupt vectors. The reset vectors are as follows: * RESET, or Power-On * COP Clock Monitor Fail * COP Failure The eight interrupt vectors service 23 interrupt sources (three non-maskable, 20 maskable). The three non-maskable interrupt vectors are as follows: * Illegal Opcode Trap * Software Interrupt * XIRQ Pin (Pseudo Non-Maskable Interrupt) The 20 maskable interrupt sources are subject to masking by a global interrupt mask, the I bit in the condition code register (CCR). In addition to the global I bit, all of these sources except the external interrupt (IRQ) pin are controlled by local enable bits in control registers. Most interrupt sources in the M68HC11 have separate interrupt vectors. For this reason, there is usually no need for software to poll control registers to determine the cause of an interrupt. The maskable interrupt sources respond to a fixed priority relationship, except that any one source can be dynamically elevated to the highest priority position of any maskable source. Refer to the table of interrupt and reset vector assignments. On-chip peripheral systems generate maskable interrupts that are recognized only if the I bit in the CCR is clear. Maskable interrupts are prioritized according to a default arrangement, but any one source can be elevated to the highest maskable priority position by the HPRIO register. The HPRIO register can be written at any time, provided the I bit in the CCR is set. For some interrupt sources, such as the parallel I/O and SCI interrupts, the flags are automatically cleared during the course of responding to the interrupt requests. For example, the RDRF flag in the SCI system is cleared by the automatic clearing mechanism, which consists of a read of the SCI status register while RDRF is set, followed by a read of the SCI data register. The normal response to an RDRF interrupt request is to read the SCI status register to check for receive errors, then to read the received data from the SCI data register. These two steps satisfy the automatic clearing mechanism without requiring any special instructions. The real-time interrupt (RTI) function generates hardware interrupts at a fixed periodic rate. These hardware interrupts provide a time reference signal for routines that measure real time. The routine notes the number of times a particular interrupt has occurred and multiplies that number by the predetermined subroutine execution time. There are four RTI signal rates available in the MC68HC11A8. The MCU oscillator frequency and the value of two software-accessible control bits, RTR1 and RTR0, in the pulse accumulator control register (PACTL) determine these signal rates. Refer to 8 Main Timer for more information about PACTL.
MC68HC11A8 MC68HC11A8TS/D
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Table 4 Interrupt and Reset Vector Assignments
Vector Address FFC0, C1 - FFD4, D5 FFD6, D7 Reserved SCI Serial System * SCI Transmit Complete * SCI Transmit Data Register Empty * SCI Idle Line Detect * SCI Receiver Overrun * SCI Receive Data Register Full FFD8, D9 FFDA, DB FFDC, DD FFDE, DF FFE0, E1 FFE3, E2 FFE4, E5 FFE6, E7 FFE8, E9 FFEA, EB FFEC, ED FFEE, EF FFF0, F1 FFF2, F3 FFF4, F5 FFF6, F7 FFF8, F9 FFFA, FB FFFC, FD FFFE, FF SPI Serial Transfer Complete Pulse Accumulator Input Edge Pulse Accumulator Overflow Timer Overflow Timer Input Capture 4/Output Compare 5 Timer Output Compare 4 Timer Output Compare 3 Timer Output Compare 2 Timer Output Compare 1 Timer Input Capture 3 Timer Input Capture 2 Timer Input Capture 1 Real-Time Interrupt Parallel I/O Handshake IRQ XIRQ Pin Software Interrupt Illegal Opcode Trap COP Failure COP Clock Monitor Fail RESET X Bit None None None None None I Bit I Bit I Bit I Bit I Bit I Bit I Bit I Bit I Bit I Bit I Bit I Bit I Bit I Bit Interrupt Source CCR Mask -- I Bit TCIE TIE ILIE RIE RIE SPIE PAII PAOVI TOI I4O5I OC4I OC3I OC2I OC1I IC3 IC2I IC1I RTII STAI None None None None NOCOP CME None Local Mask --
OPTION --System Configuration Options
Bit 7 ADPU RESET: 0 6 CSEL 0 5 IRQE* 0 4 DLY* 1 3 CME 0 2 0 0 1 CR1* 0
$1039
Bit 0 CR0* 0
*Can be written only once in first 64 cycles out of reset in normal modes, or any time in special modes.
ADPU --A/D Converter Power-up Refer to 10 Analog-to-Digital Converter. CSEL --Clock Select Refer to 10 Analog-to-Digital Converter. IRQE -- IRQ Select Edge-Sensitive Only 0 = Low logic level recognition 1 = Falling edge recognition
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MC68HC11A8 MC68HC11A8TS/D
DLY -- Enable Oscillator Start-Up Delay on Exit from STOP 0 = No stabilization delay on exit from STOP 1 = Stabilization delay enabled on exit from STOP CME -- Clock Monitor Enable 0 = Clock monitor disabled; slow clocks can be used 1 = Slow or stopped clocks cause clock failure reset CR1, CR0 -- COP Timer Rate Select
Divide E/215 By 1 4 16 64 E= XTAL = 4.0 Mhz Timeout -0/+32.8 ms 32.768 ms 131.072 ms 524.288 ms 2.097 sec 1.0 MHz XTAL = 8.0 MHz Timeout -0/+16.4 ms 16.384 ms 65.536 ms 262.140 ms 1.049 sec 2.0 MHz XTAL = 12.0 MHz Timeout -0/+10.9 ms 10.923 ms 43.691 ms 174.76 ms 699.05 ms 3.0 MHz
CR [1:0] 00 01 10 11
COPRST -- Arm/Reset COP Timer Circuitry
Bit 7 7 RESET: 0 6 6 0 5 5 0 4 4 0 3 3 0 2 2 0 1 1 0
$103A
Bit 0 0 0
Write $55 to COPRST to arm COP watchdog clearing mechanism. Write $AA to COPRST to reset COP watchdog. HPRIO -- Highest Priority I-Bit Interrupt and Miscellaneous
Bit 7 RBOOT RESET: -- 6 SMOD -- 5 MDA -- 4 IRV -- 3 PSEL3 0 2 PSEL2 1 1 PSEL1 0
$103C
Bit 0 PSEL0 1
RBOOT -- Read Bootstrap ROM Bits 7-4 Refer to 2 Operating Modes and Memory Maps. SMOD -- Special Mode Select Refer to 2 Operating Modes and Memory Maps. MDA -- Mode Select A Refer to 2 Operating Modes and Memory Maps. IRV -- Internal Read Visibility Refer to 2 Operating Modes and Memory Maps. PSEL[3:0] -- Priority Select Bits 3 through 0 Can be written only while the I bit in the CCR is set (interrupts disabled). These bits select one interrupt source to be elevated above all other I-bit related sources.
MC68HC11A8 MC68HC11A8TS/D
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PSEL[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
Interrupt Source Promoted Timer Overflow Pulse Accumulator Overflow Pulse Accumulator Input Edge SPI Serial Transfer Complete SCI Serial System Reserved (Default to IRQ) IRQ Real-Time Interrupt Timer Input Capture 1 Timer Input Capture 2 Timer Input Capture 3 Timer Output Compare 1 Timer Output Compare 2 Timer Output Compare 3 Timer Output Compare 4 Timer Output Compare 5
CONFIG -- COP, ROM, EEPROM Enables
Bit 7 0 RESET: 0 6 0 0 5 0 0 4 0 0 3 NOSEC -- 2 -- 1 -- NOCOP ROMON
$103F
Bit 0 EEON --
NOTE The bits of this register are implemented with EEPROM cells. Programming and erasing follow normal EEPROM procedures. The erased state of CONFIG is $0F. A new value is not readable until after a subsequent reset sequence. CONFIG can only be programmed or erased in special modes. NOSEC -- EEPROM Security Disable Refer to 4 Electrically Erasable Programmable Read-Only Memory (EEPROM). NOCOP -- COP system disable 0 = COP enabled (forces reset on timeout) 1 = COP disabled (does not force reset on timeout) ROMON -- ROM Enable Refer to 2 Operating Modes and Memory Maps. EEON -- EEPROM Enable Refer to 2 Operating Modes and Memory Maps.
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MC68HC11A8 MC68HC11A8TS/D
4 Electrically Erasable Programmable Read-Only Memory (EEPROM)
The 512 bytes of EEPROM in the MC68HC11A8 are located at $B600 through $B7FF. The EEON bit in CONFIG controls the presence or absence of the EEPROM in the memory map. When EEON = 1 (erased state), the EEPROM is enabled. When EEON = 0, the EEPROM is disabled and out of the memory map. EEON is reset to the value last programmed into CONFIG. An on-chip charge pump develops the high voltage required for programming and erasing. When the E clock is less than 1 MHz, select an internal clock. This drives the EEPROM charge pump by writing a one to the CSEL bit in the OPTION register. The PPROG register controls the programming and erasing of the EEPROM. To erase the EEPROM, complete the following steps using the PPROG register: 1. Write to PPROG with the ERASE, EELAT, and appropriate BYTE and ROW bits set. 2. Write to the appropriate EEPROM address with any data. Row erase only requires a write to any location in the row. Bulk erase is accomplished by writing to any location in the array. 3. Write to PPROG with ERASE, EELAT, EEPGM, and the appropriate BYTE and ROW bits set. 4. Delay for 10 ms or more, as appropriate. 5. Clear the EEPGM bit in PPROG to turn off the high voltage. 6. Clear the PPROG register to reconfigure the EEPROM address and data buses for normal operation. To program the EEPROM, complete the following steps using the PPROG register: 1. 2. 3. 4. 5. 6. Write to PPROG with the EELAT bit set. Write data to the desired address. Write to PPROG with the EELAT and EEPGM bits set. Delay for 10 ms or more, as appropriate. Clear the EEPGM bit in PPROG to turn off the high voltage. Clear the PPROG register to reconfigure the EEPROM address and data buses for normal operation. $103B
3 ROW 0 2 ERASE 0 1 EELAT 0 Bit 0 EEPGM 0
PPROG -- EEPROM Programming Control
Bit 7 ODD RESET: 0 6 EVEN 0 5 0 0 4 BYTE 0
ODD -- Program Odd Rows in Half of EEPROM (TEST) EVEN -- Program Even Rows in Half of EEPROM (TEST) BYTE -- Byte/Other EEPROM Erase Mode The BYTE bit overrides the ROW bit. 0 = Row or bulk erase mode is used 1 = Erase only one byte of EEPROM ROW -- Row/All EEPROM Erase Mode The ROW bit is only valid when BYTE = 0. 0 = All 512 bytes of EEPROM are erased 1 = Erase only one 16-byte row of EEPROM
BYTE 0 0 1 1 ROW 0 1 0 1 Action Bulk Erase (All 512 Bytes) Row Erase (16 Bytes) Byte Erase Byte Erase
MC68HC11A8 MC68HC11A8TS/D
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ERASE -- Erase/Normal Control for EEPROM 0 = Normal read or program mode 1 = Erase mode EELAT -- EEPROM Latch Control 0 = EEPROM address and data bus configured for normal reads 1 = EEPROM address and data bus configured for programming or erasing EEPGM -- EEPROM Program Command 0 = Programming or erase voltage switched off to EEPROM array 1 = Programming or erase voltage switched on to EEPROM array CONFIG -- COP, ROM, EEPROM Enables
Bit 7 0 RESET: 0 6 0 0 5 0 0 4 0 0 3 NOSEC -- 2 -- 1 -- NOCOP ROMON
$103F
Bit 0 EEON --
NOTE The bits of this register are implemented with EEPROM cells. Programming and erasing follow normal EEPROM procedures. The erased state of CONFIG is $0F. A new value is not readable until after a subsequent reset sequence. CONFIG can only be programmed or erased in special modes. NOSEC -- EEPROM Security Disable NOSEC has no meaning unless the security mask option was specified before the MCU was manufactured. 0 = Security enabled (available as a mask option on MC68HC11A8 only) 1 = Security disabled NOCOP -- COP system disable Refer to 3 Resets and Interrupts. ROMON -- ROM Enable Refer to 2 Operating Modes and Memory Maps. EEON -- EEPROM Enable 0 = EEPROM is removed from the memory map 1 = EEPROM is present in the memory map
MOTOROLA 18
MC68HC11A8 MC68HC11A8TS/D
5 Parallel Input/Output
The MC68HC11A8 has up to 38 input/output lines, depending on the operating mode. Port A has three input-only pins, four output-only pins, and one bidirectional I/O pin. Port A shares functions with the timer system. Port B is an 8-bit output-only port in single-chip modes and is the high-order address in expanded modes. Port C is an 8-bit bidirectional port in single-chip modes and the multiplexed address and data bus in expanded modes. Port D is a 6-bit bidirectional port that shares functions with the serial systems. Port E is an 8-bit input-only port that shares functions with the A/D system. Simple and full handshake input and output functions are available on ports B and C lines in single-chip mode. A description of the handshake functions follows. In port B simple strobed output mode, the STRB output is pulsed for two E-clock periods each time there is a write to the PORTB register. The INVB bit in the PIOC register controls the polarity of STRB pulses. In port C simple strobed input mode, port C levels are latched into the alternate port C latch (PORTCL) register on each assertion of the STRA input. STRA edge select, flag and interrupt enable bits are located in the PIOC register. Any or all of the port C lines can still be used as general purpose I/O while in strobed input mode. Port C full handshake mode involves port C pins and the STRA and STRB lines. Input and output handshake modes are supported, and output handshake mode has a three-stated variation. STRA is an edge detecting input, and STRB is a handshake output. Control and enable bits are located in the PIOC register. In full input handshake mode, the MCU uses STRB as a "ready" line to an external system. Port C logic levels are latched into PORTCL when the STRA line is asserted by the external system. The MCU then negates STRB. The MCU reasserts STRB after the PORTCL register is read. A mix of latched inputs, static inputs, and static outputs is allowed on port C, differentiated by the data direction bits and use of the PORTC and PORTCL registers. In full output handshake mode, the MCU writes data to PORTCL, which in turn asserts the STRB output to indicate that data is ready. The external system reads port C (the STRB output) and asserts the STRA input to acknowledge that data has been received. In the three-state variation of output handshake mode, lines intended as three-state handshake outputs are configured as inputs by clearing the corresponding DDRC bits. The MCU writes data to PORTCL and asserts STRB. The external system responds by activating the STRA input, which forces the MCU to drive the data in PORTCL out on all of the port C lines. This mode variation does not allow part of port C to be used for static inputs while other port C pins are being used for handshake outputs. Refer to the PIOC register description.
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 19
PORTA -- Port A Data
Bit 7 PA7 RESET: Alt. Pin Func.: And/or: HiZ PAI OC1 6 PA6 0 OC2 OC1 5 PA5 0 OC3 OC1 4 PA4 0 OC4 OC1 3 PA3 0 OC5 OC1 2 PA2 HiZ IC1 -- 1 PA1 HiZ IC2 --
$1000
Bit 0 PA0 HiZ IC3 --
PIOC -- Parallel I/O Control
Bit 7 STAF RESET: 0 6 STAI 0 5 CWOM 0 4 HNDS 0 3 OIN 0 2 PLS U 1 EGA 1
$1002
Bit 0 INVB 1
STAF -- Strobe A Interrupt Status Flag Set when selected edge occurs on Strobe A. Cleared by PIOC read with STAF set followed by PORTCL read (simple strobed or full input handshake mode) or PORTCL write (output handshake mode). STAI -- Strobe A Interrupt Enable Mask 0 = STAF interrupts disabled 1 = STAF interrupts enabled CWOM -- Port C Wire-OR Mode (affects all eight port C pins) 0 = Port C outputs are normal CMOS outputs 1 = Port C outputs are open-drain outputs HNDS -- Handshake Mode 0 = Simple strobe mode 1 = Full input or output handshake mode OIN -- Output or Input Handshake Select HNDS must be set to one for this bit to have meaning. 0 = Input handshake 1 = Output handshake PLS -- Pulse/Interlocked Handshake Operation HNDS must be set to one for this bit to have meaning. 0 = Interlocked handshake 1 = Pulsed handshake (strobe B pulses high for two E-clock cycles) EGA -- Active Edge for Strobe A 0 = STRA falling edge selected 1 = STRA rising edge selected INVB -- Invert Strobe B 0 = Active level is logic zero 1 = Active level is logic one
MOTOROLA 20
MC68HC11A8 MC68HC11A8TS/D
Table 5 Parallel I/O Control
STAF Clearing Sequence Simple strobed mode Read PIOC with STAF=1 then read PORTCL Read PIOC with STAF=1 then read PORTCL HNDS 0 OIN X PLS X
0 1
EGA
Port C Inputs latched into PORTCL on any active edge on STRA
Port B STRB pulses on writes to port B
Full input handshake
1
0
0 = STRB active level 1 = STRB active pulse
1 0
Inputs latched Normal outinto PORTCL put port, on any active unaffected edge on STRA in handshake modes Driven as out- Normal outputs if STRA at put port, active level, unaffected follows DDRC in handif STRA not at shake active level modes
Full output handshake
Read PIOC with STAF=1 then write to PORTCL
1
1
0 = STRB active level 1 = STRB active pulse
0 Port C Driven STRA Follow Active Edge Follow DDRC DDRC 1
PORTC -- Port C Data
Bit 7 PC7 S. Chip or Boot: RESET: PC7 0 6 PC6 PC6 0 ADDR6/ DATA6 5 PC5 PC5 0 ADDR5/ DATA5 4 PC4 PC4 0 ADDR4/ DATA4 3 PC3 PC3 0 ADDR3/ DATA3 2 PC2 PC2 0 ADDR2/ DATA2 1 PC1 PC1 0 ADDR1/ DATA1
$1003
Bit 0 PC0 PC0 0 ADDR0/ DATA0
Expan. or ADDR7/ Test: DATA7
NOTE In single chip and boot modes, port C pins reset to high impedance inputs (DDRC registers are set to zero). In expanded and special test modes, port C is a multiplexed address/data bus and the port C register address is treated as an external memory location. PORTB -- Port B Data
Bit 7 PB7 S. Chip or Boot: RESET: PB7 0 6 PB6 PB6 0 5 PB5 PB5 0 4 PB4 PB4 0 3 PB3 PB3 0 2 PB2 PB2 0 1 PB1 PB1 0 ADDR9
$1004
Bit 0 PB0 PB0 0 ADDR8
Expan. or Test: ADDR15 ADDR14 ADDR13 ADDR12 ADDR11 ADDR10
PORTCL -- Port C Latched
Bit 7 PCL7 RESET: U 6 PCL6 U 5 PCL5 U 4 PCL4 U 3 PCL3 U 2 PCL2 U 1 PCL1 U
$1005
Bit 0 PCL0 U
Writes affect port C pins. PORTCL is used in the handshake clearing mechanism. When an active edge occurs on the STRA pin, port C data is latched into the PORTCL register.
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 21
DDRC -- Data Direction Register for Port C
Bit 7 DDC7 RESET: 0 6 DDC6 0 5 DDC5 0 4 DDC4 0 3 DDC3 0 2 DDC2 0 1 DDC1 0
$1007
Bit 0 DDC0 0
DDC[7:0] -- Data Direction Register for Port C 0 = Input 1 = Output PORTD -- Port D Data
Bit 7 0 RESET: Alt. Pin Func.: 0 -- 6 0 0 -- 5 PD5 0 SS 4 PD4 0 SCK 3 PD3 0 MOSI 2 PD2 0 MISO 1 PD1 0 TxD
$1008
Bit 0 PD0 0 RxD
DDRD -- Data Direction Register for Port D
Bit 7 0 RESET: Alt. Pin Func.: 0 -- 6 0 0 -- 5 DDD5 0 PD5/ SS 4 DDD4 0 PD4/ SCK 3 DDD3 0 PD3/ MOSI 2 DDD2 0 PD2/ MISO 1 DDD1 0 PD1/ TxD
$1009
Bit 0 DDD0 0 PD0/ RxD
DDD[5:0] -- Data Direction for Port D 0 = Input 1 = Output PORTE -- Port E Data
Bit 7 PE7 RESET: Alt. Pin Func.: U AN7 6 PE6 U AN6 5 PE5 U AN5 4 PE4 U AN4 3 PE3 U AN3 2 PE2 U AN2 1 PE1 U AN1
$100A
Bit 0 PE0 U AN0
PACTL -- Pulse Accumulator Control
Bit 7 DDRA7 RESET: 0 6 PAEN 0 5 PAMOD 0 4 PEDGE 0 3 0 0 2 0 0 1 RTR1 0
$1026
Bit 0 RTR0 0
DDRA7 -- Data Direction for Port A Bit 7 0 = Input 1 = Output PAEN -- Pulse Accumulator System Enable Refer to 9 Pulse Accumulator. PAMOD -- Pulse Accumulator Mode Refer to 9 Pulse Accumulator. PEDGE -- Pulse Accumulator Edge Control Refer to 9 Pulse Accumulator. RTR1, RTR0 -- Real-Time Interrupt Rate Refer to 8 Main Timer.
MOTOROLA 22
MC68HC11A8 MC68HC11A8TS/D
6 Serial Communications Interface (SCI)
The SCI, a universal asynchronous receiver transmitter (UART) serial communications interface, is one of two independent serial I/O subsystems in the MC68HC11A8. It has a standard NRZ format (one start, eight or nine data, and one stop bit) and several baud rates available. The SCI transmitter and receiver are independent, but use the same data format and bit rate.
TRANSMITTER BAUD RATE CLOCK
(WRITE ONLY) SCDR Tx BUFFER DDD1 10 (11) - BIT Tx SHIFT REGISTER H (8) 7 6 5 4 3 2 1 0 L PIN BUFFER AND CONTROL PD1 TxD
TRANSFER Tx BUFFER
SHIFT ENABLE
PREAMBLE--JAM 1s
JAM ENABLE
BREAK--JAM 0s
SIZE 8/9
8
FORCE PIN DIRECTION (OUT) TRANSMITTER CONTROL LOGIC
8 WAKE TC RDRF IDLE TDRE OR NF FE R8 T8 M
SCCR1 SCI CONTROL 1
SCSR INTERRUPT STATUS
8 TDRE TIE TC TCIE TIE TCIE RIE ILIE TE RE RWU SBK SCCR2 SCI CONTROL 2 SCI Rx REQUESTS SCI INTERRUPT REQUEST
INTERNAL DATA BUS
11 SCI TX BLOCK
Figure 6 SCI Transmitter Block Diagram
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 23
RECEIVER BAUD RATE CLOCK DDD0 STOP 10 (11) - BIT Rx SHIFT REGISTER (8) 7 6 5 4 3 2 1 0 ALL ONES START 8 M WAKE TDRE TC RDRF IDLE OR NF FE R8 T8 (READ ONLY) 8 RDRF RIE IDLE ILIE OR RIE TIE TCIE RIE ILIE TE RE RWU SBK 8 INTERNAL DATA BUS /16 PD0 RxD PIN BUFFER AND CONTROL DISABLE DRIVER RE DATA RECOVERY
MSB
M
WAKEUP LOGIC
RWU
SCCR1 SCI CONTROL 1
SCSR SCI STATUS 1
SCDR Rx BUFFER
SCCR2 SCI CONTROL 2
SCI Tx REQUESTS
SCI INTERRUPT REQUEST
11 SCI RX BLOCK
Figure 7 SCI Receiver Block Diagram
MOTOROLA 24
MC68HC11A8 MC68HC11A8TS/D
BAUD -- Baud Rate
Bit 7 TCLR RESET: 0 6 0 0 5 SCP1 0 4 SCP0 0 3 RCKB 0 2 SCR2 U 1 SCR1 U
$102B
Bit 0 SCR0 U
TCLR -- Clear Baud Rate Counters (TEST) SCP1, SCP0 -- SCI Baud Rate Prescaler Selects
Divide Internal Clock By 1 3 4 13 Crystal Frequency in MHz 4.0 MHz (Baud) 62.50K 20.83K 15.625K 4800 8.0 MHz (Baud) 125.0K 41.67K 31.25K 9600 10.0 MHz (Baud) 156.25K 52.08K 38.4K 12.02K 12.0 MHz (Baud) 187.5K 62.5K 46.88K 14.42K
SCP[1:0] 00 01 10 11
RCKB -- SCI Baud Rate Clock Check (TEST) SCR2, SCR1, and SCR0 -- SCI Baud Rate Selects Selects receiver and transmitter bit rate based on output from baud rate prescaler stage.
Divide Prescaler By 1 2 4 8 16 32 64 128 Highest Baud Rate (Prescaler Output from Previous Table) 4800 4800 2400 1200 600 300 150 -- -- 9600 9600 4800 2400 1200 600 300 150 -- 38.4K 38.4K 19.2K 9600 4800 2400 1200 600 300
SCP[2:0] 000 001 010 011 100 101 110 111
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 25
EXTAL
XTAL
OSCILLATOR AND CLOCK GENERATOR (/4)
INTERNAL BUS CLOCK (PH2)
/3
0:0 0:1
/4
1:0
/13
SCP[1:0] 1:1
E AS
SCR[2:0] 0:0:0
/2 /2 /2 /2 /2 /2 /2
0:0:1
0:1:0
0:1:1
/16
1:0:0 SCI TRANSMIT BAUD RATE (1X)
1:0:1
1:1:0
1:1:1
SCI RECEIVE BAUD RATE (16X)
SCI BAUD GENERATOR
Figure 8 SCI Baud Rate Diagram
SCCR1 -- SCI Control Register 1
Bit 7 R8 RESET: U 6 T8 U 5 0 0 4 M 0 3 WAKE 0 2 0 0 1 0 0
$102C
Bit 0 0 0
R8 -- Receive Data Bit 8 If M bit is set, R8 stores ninth bit in receive data character. T8 -- Transmit Data Bit 8 If M bit is set, T8 stores ninth bit in transmit data character. M -- Mode (Select Character Format) 0 = Start bit, 8 data bits, 1 stop bit 1 = Start bit, 9 data bits, 1 stop bit
MOTOROLA 26
MC68HC11A8 MC68HC11A8TS/D
WAKE -- Wake Up by Address Mark/Idle 0 = Wake up by IDLE line recognition 1 = Wake up by address mark (most significant data bit set) SCCR2 -- SCI Control Register 2
Bit 7 TIE RESET: 0 6 TCIE 0 5 RIE 0 4 ILIE 0 3 TE 0 2 RE 0 1 RWU 0
$102D
Bit 0 SBK 0
TIE -- Transmit Interrupt Enable 0 = TDRE interrupts disabled 1 = SCI interrupt requested when TDRE status flag is set TCIE -- Transmit Complete Interrupt Enable 0 = TC interrupts disabled 1 = SCI interrupt requested if TC is set to one RIE -- Receiver Interrupt Enable 0 = RDRF and OR interrupts disabled 1 = SCI interrupt requested when RDRF flag or the OR status flag is set ILIE -- Idle Line Interrupt Enable 0 = IDLE interrupts disabled 1 = SCI interrupt requested when IDLE status flag is set TE -- Transmitter Enable 0 = Transmitter disabled 1 = Transmitter enabled RE -- Receiver Enable 0 = Receiver disabled 1 = Receiver enabled RWU -- Receiver Wake Up Control 0 = Normal SCI receiver 1 = Wake up enabled and receiver interrupts inhibited SBK -- Send Break 0 = Break generator off 1 = Break codes generated as long as SBK is set to one SCSR -- SCI Status Register
Bit 7 TDRE RESET: 1 6 TC 1 5 RDRF 0 4 IDLE 0 3 OR 0 2 NF 0 1 FE 0
$102E
Bit 0 0 0
TDRE -- Transmit Data Register Empty Flag Set if transmit data can be written to SCDR; if TDRE is zero, transmit data register is busy. Cleared by SCSR read with TDRE set followed by SCDR write. TC -- Transmit Complete Flag Set if transmitter is idle (no data, preamble, or break transmission in progress). Cleared by SCSR read with TC set followed by SCDR write.
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 27
RDRF -- Receive Data Register Full Flag Set if a received character is ready to be read from SCDR. Cleared by SCSR read with RDRF set followed by SCDR read. IDLE -- Idle Line Detected Flag Set if the RxD line is idle. IDLE flag is inhibited when RWU is set to one. Cleared by SCSR read with IDLE set followed by SCDR read. Once cleared, IDLE is not set again until the RxD line has been active and becomes idle again. OR -- Overrun Error Flag Set if a new character is received before a previously received character is read from SCDR. Cleared by SCSR read with OR set followed by SCDR read. NF -- Noise Error Flag Set if majority sample logic detects anything other than a unanimous decision. Cleared by SCSR read with NF set followed by SCDR read. FE -- Framing Error Set if a zero is detected where a stop bit was expected. Cleared by SCSR read with FE set followed by SCDR read. SCDR -- SCI Data Register
Bit 7 R7/T7 RESET: U 6 R6/T6 U 5 R5/T5 U 4 R4/T4 U 3 R3/T3 U 2 R2/T2 U 1 R1/T1 U
$102F
Bit 0 R0/T0 U
NOTE Receive and transmit are double buffered. Reads access the receive data buffer and writes access the transmit data buffer.
MOTOROLA 28
MC68HC11A8 MC68HC11A8TS/D
7 Serial Peripheral Interface (SPI)
The SPI is one of two independent serial communications subsystems that allow the MCU to communicate synchronously with peripheral devices and other microprocessors. Data rates can be as high as one half of the E-clock rate when configured as master, and as fast as the E clock when configured as slave.
INTERNAL MCU CLOCK MISO PD2
S M
/2
8/16-BIT SHIFT REGISTER READ DATA BUFFER
CLOCK SELECT SPI CLOCK (MASTER) CLOCK LOGIC S M
PIN CONTROL LOGIC
DIVIDER /4 /16 /32
MSB
LSB
M S
MOSI PD3
SCK PD4
SPR1
SPR0
SS PD5 MSTR SPE DWOM SPI CONTROL MSTR SPE
SPIF WCOL
MODF
8 SPI STATUS REGISTER 8 8 SPI CONTROL REGISTER
SPI INTERRUPT REQUEST
INTERNAL DATA BUS
SPIE SPE DWOM MSTR CPOL CPHA SPR1 SPR0
11 SPI BLOCK
Figure 9 SPI Block Diagram
DDRD -- Data Direction Register for Port D
Bit 7 0 RESET: Alt. Pin Func.: 0 __ 6 0 0 __ 5 DDD5 0 PD5/ SS 4 DDD4 0 PD4/ SCK 3 DDD3 0 PD3/ MOSI 2 DDD2 0 PD2/ MISO 1 DDD1 0 PD1/ TxD
$1009
Bit 0 DDD0 0 PD0/ RxD
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 29
DDD[5:0] -- Data Direction for Port D When DDRD bit 5 is zero and MSTR = 1 in SPCR, PD5/SS is a general-purpose output and mode fault logic is disabled. 0 = Input 1 = Output SPCR -- Serial Peripheral Control Register
Bit 7 SPIE RESET: 0 6 SPE 0 5 DWOM 0 4 MSTR 0 3 CPOL 0 2 CPHA 1 1 SPR1 U
$1028
Bit 0 SPR0 U
SPIE -- Serial Peripheral Interrupt Enable 0 = SPI interrupts disabled 1 = SPI interrupts enabled SPE -- Serial Peripheral System Enable 0 = SPI off 1 = SPI on DWOM -- Port D Wired-OR Mode DWOM affects all six port D pins. 0 = Normal CMOS outputs 1 = Open-drain outputs MSTR -- Master Mode Select 0 = Slave mode 1 = Master mode CPOL, CPHA -- Clock Polarity, Clock Phase Refer to Figure 10
SCK CYCLE # SCK (CPOL = 0) SCK (CPOL = 1) SAMPLE INPUT (CPHA = 0) DATA OUT SAMPLE INPUT (CPHA = 1) DATA OUT SS (TO SLAVE) SLAVE CPHA=1 TRANSFER IN PROGRESS 3 MASTER TRANSFER IN PROGRESS 2 1 1. SS ASSERTED 2. MASTER WRITES TO SPDR 3. FIRST SCK EDGE 4. SPIF SET 5. SS NEGATED
SPI TRANSFER FORMAT 1
1
2
3
4
5
6
7
8
MSB
6
5
4
3
2
1
LSB
MSB
6
5
4
3
2
1
LSB
4 SLAVE CPHA=0 TRANSFER IN PROGRESS 5
Figure 10 SPI Transfer Format
MOTOROLA 30
MC68HC11A8 MC68HC11A8TS/D
SPR1 and SPR0 -- SPI Clock Rate Selects
SPR [1:0] 00 01 10 11 E-Clock Divide By 2 4 16 32 Frequency at E = 2 MHz (Baud) 1.0 MHz 500 kHz 125 kHz 62.5 kHz
SPSR -- Serial Peripheral Status Register
Bit 7 SPIF RESET: 0 6 WCOL 0 5 0 0 4 MODF 0 3 0 0 2 0 0 1 0 0
$1029
Bit 0 0 0
SPIF -- SPI Transfer Complete Flag Set when an SPI transfer is complete. Cleared by reading SPSR with SPIF set followed by SPDR access. WCOL -- Write Collision Set when SPDR is written while transfer is in progress. Cleared by SPSR with WCOL set followed by SPDR access. MODF -- Mode Fault (A Mode Fault Terminates SPI Operation) Set when SS is pulled low while MSTR = 1. Cleared by SPSR read with MODF set followed by SPCR write. SPDR -- SPI Data Register
Bit 7 Bit 7 6 6 5 5 4 4 3 3 2 2 1 1
$102A
Bit 0 Bit 0
NOTE SPI is double buffered in, single buffered out.
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 31
8 Main Timer
The main timer is based on a free-running 16-bit counter with a four-stage programmable prescaler. A timer overflow function allows software to extend the system's timing capability beyond the counter's 16-bit range. The timer has three channels of input capture and five channels of output compare. Refer to the following table for a summary of crystal-related frequencies and periods. Table 6 Timer Summary
XTAL Frequencies Control Bits PR[1:0] 00 1 count -- overflow -- 01 1 count -- overflow -- 10 1 count -- overflow -- 11 1 count -- overflow -- RTR[1:0] 00 01 10 11 8.192 ms 16.384 ms 32.768 ms 65.536 ms 1.0 s 65.536 ms 4.0 s 262.14 ms 8.0 s 524.29 ms 16.0 s 1.049 s 4.0 MHz 1.0 MHz 1000 ns 8.0 MHz 2.0 MHz 500 ns 12.0 MHz 3.0 MHz 333 ns Other Rates (E) (1/E)
Main Timer Count Rates 500 ns 32.768 ms 2.0 s 131.07 ms 4.0 s 262.14 ms 8.0 s 524.29 ms 4.096 ms 8.192 ms 16.384 ms 32.768 ms 333 ns 21.845 ms 1.333 s 87.381 ms 2.667 s 174.76 ms 5.333 s 349.52 ms 2.731 ms 5.461 ms 10.923 ms 21.845 ms (E/1) (E/216) (E/4) (E/218) (E/8) (E/219) (E/16) (E/220) (E/213) (E/214) (E/215) (E/216)
Periodic (RTI) Interrupt Rates
MOTOROLA 32
MC68HC11A8 MC68HC11A8TS/D
MCU E CLK
PRESCALER DIVIDE BY 1, 4, 8, OR 16 PR1 PR0
TCNT (HI)
TCNT (LO)
TOI TOF TAPS FOR RTI, COP WATCHDOG, AND PULSE ACCUMULATOR
16-BIT FREE RUNNING COUNTER
9
16-BIT TIMER BUS OC1I 16-BIT COMPARATOR = TOC1 (HI) TOC1 (LO) OC1F FOC1 OC2I 16-BIT COMPARATOR = TOC2 (HI) TOC2 (LO) OC2F FOC2 OC3I 16-BIT COMPARATOR = TOC3 (HI) TOC3 (LO) OC3F FOC3 OC4I 16-BIT COMPARATOR = TOC4 (HI) TOC4 (LO) OC5 I4/O5F IC4 I4/O5 16-BIT LATCH TIC1 (HI) CLK IC1F IC2I IC2F IC3I IC3F TFLG 1 STATUS FLAGS TMSK 1 INTERRUPT ENABLES CFORC FORCE OUTPUT COMPARE IC1I FOC5 OC4F FOC4 I4/O5I 16-BIT COMPARATOR = TI4/O5 (HI) TI4/O5 (LO) CLK
INTERRUPT REQUESTS (FURTHER QUALIFIED BY I BIT IN CCR) TO PULSE ACCUMULATOR 8 BIT 7 7 BIT 6 6 BIT 5 5 BIT 4 4 BIT 3 PA3/OC5/ IC4/OC1 PA4/OC4/ OC1 PA5/OC3/ OC1 PA6/OC2/ OC1 PIN FUNCTIONS PA7/OC1/ PAI
16-BIT LATCH
3 BIT 2 2 BIT 1 1 BIT 0 PA0/IC3 PA1/IC2 PA2/IC1
TIC1 (LO) CLK
16-BIT LATCH TIC2 (HI)
TIC2 (LO) CLK
16-BIT LATCH TIC3 (HI)
TIC3 (LO) PORT A PIN CONTROL
CAPTURE COMPARE BLOCK
Figure 11 Main Timer NOTE: Port A pin actions are controlled by OC1M, OC1D, PACTL, TCTL1, and TCTL2 registers.
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 33
CFORC -- Timer Compare Force
Bit 7 FOC1 RESET: 0 6 FOC2 0 5 FOC3 0 4 FOC4 0 3 FOC5 0 2 0 0 1 0 0
$100B
Bit 0 0 0
FOC5-FOC1 -- Write ones to Force Compare(s) 0 = Not affected 1 = Output compare x action occurs, but OCxF flag bit not set OC1M -- Output Compare 1 Mask
Bit 7 OC1M7 RESET: 0 6 OC1M6 0 5 OC1M5 0 4 OC1M4 0 3 OC1M3 0 2 0 0 1 0 0
$100C
Bit 0 0 0
Set bit(s) to enable OC1 to control corresponding pin(s) of port A. OC1D -- Output Compare 1 Data
Bit 7 OC1D7 RESET: 0 6 OC1D6 0 5 OC1D5 0 4 OC1D4 0 3 OC1D3 0 2 0 0 1 0 0
$100D
Bit 0 0 0
If OC1Mx is set, data in OC1Dx is output to port A bit x on successful OC1 compares. TCNT -- Timer Counter
$100E Bit 15 Bit 7 14 6 13 5 12 4 11 3 10 2 9 1
$100E, $100F
Bit 8 Bit 0 High Low TCNT
TCNT resets to $0000. In normal modes, TCNT is read-only. TIC1-TIC3 -- Timer Input Capture
$1010 $1011 $1012 $1013 $1014 $1015 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 14 6 14 6 14 6 13 5 13 5 13 5 12 4 12 4 12 4 11 3 11 3 11 3 10 2 10 2 10 2
$1010-$1015
9 1 9 1 9 1 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 High Low High Low High Low TIC3 TIC2 TIC1
TICx not affected by reset.
MOTOROLA 34
MC68HC11A8 MC68HC11A8TS/D
TOC1-TOC5 -- Timer Output Compare
$1016 $1017 $1018 $1019 $101A $101B $101C $101D $101E $101F Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 Bit 15 Bit 7 14 6 14 6 14 6 14 6 14 6 13 5 13 5 13 5 13 5 13 5 12 4 12 4 12 4 12 4 12 4 11 3 11 3 11 3 11 3 11 3 10 2 10 2 10 2 10 2 10 2
$1016-$101F
9 1 9 1 9 1 9 1 9 1 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 Bit 8 Bit 0 High TOC1 Low High TOC2 Low High TOC3 Low High TOC4 Low High TOC5 Low
All TOCx register pairs reset to ones ($FFFF). TCTL1 -- Timer Control 1
Bit 7 OM2 RESET: 0 6 OL2 0 5 OM3 0 4 OL3 0 3 OM4 0 2 OL4 0 1 OM5 0
$1020
Bit 0 OL5 0
OM2-OM5 -- Output Mode OL2-OL5 -- Output Level
OMx 0 0 1 1 OLx 0 1 0 1 Action Taken on Successful Compare Timer disconnected from output pin logic Toggle OCx output line Clear OCx output line to 0 Set OCx output line to 1
TCTL2 -- Timer Control 2
Bit 7 -- RESET: 0 6 -- 0 5 EDG1B 0 4 EDG1A 0 3 EDG2B 0 2 EDG2A 0 1 EDG3B 0
$1021
Bit 0 EDG3A 0
Table 7 Timer Control Configuration
EDGxB 0 0 1 1 EDGxA 0 1 0 1 Configuration Capture disabled Capture on rising edges only Capture on falling edges only Capture on any edge
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 35
TMSK1 -- Timer Interrupt Mask 1
Bit 7 OC1I RESET: 0 6 OC2I 0 5 OC3I 0 4 OC4I 0 3 OC5I 0 2 IC1I 0 1 IC2I 0
$1022
Bit 0 IC3I 0
OC1I-OC5I -- Output Compare x Interrupt Enable If the OCxI enable bit is set when the OCxF flag bit is set, a hardware interrupt sequence is requested. IC1I-IC3I -- Input Capture x Interrupt Enable If the ICxI enable bit is set when the ICxF flag bit is set, a hardware interrupt sequence is requested. NOTE Bits in TMSK1 correspond bit for bit with flag bits in TFLG1. Ones in TMSK1 enable the corresponding interrupt sources. TFLG1 -- Timer Interrupt Flag 1
Bit 7 OC1F RESET: 0 6 OC2F 0 5 OC3F 0 4 OC4F 0 3 OC5F 0 2 IC1F 0 1 IC2F 0
$1023
Bit 0 IC3F 0
Clear flags by writing a one to the corresponding bit position(s). OC1F-OC5F -- Output Compare x Flag Set each time the counter matches output compare x value. IC1F-IC3F -- Input Capture x Flag Set each time a selected active edge is detected on the ICx input line. TMSK2 -- Timer Interrupt Mask 2
Bit 7 TOI RESET: 0 6 RTII 0 5 PAOVI 0 4 PAII 0 3 0 0 2 0 0 1 PR1 0
$1024
Bit 0 PR0 0
TOI -- Timer Overflow Interrupt Enable 0 = TOF interrupts disabled 1 = Interrupt requested when TOF is set to one RTII -- Real-Time Interrupt Enable 0 = RTIF interrupts disabled 1 = Interrupt requested when RTIF is set to one PAOVI -- Pulse Accumulator Overflow Interrupt Enable Refer to 9 Pulse Accumulator. PAII -- Pulse Accumulator Input Edge Interrupt Enable Refer to 9 Pulse Accumulator. NOTE Bits in TMSK2 correspond bit for bit with flag bits in TFLG2. Ones in TMSK2 enable the corresponding interrupt sources. PR1 and PR0 -- Timer Prescaler Select In normal modes, PR1 and PR0 can only be written once, and the write must be within 64 cycles after reset. Refer to Table 6 for specific timing values.
MOTOROLA 36
MC68HC11A8 MC68HC11A8TS/D
PR[1:0] 00 01 10 11
Prescaler 1 4 8 16
TFLG2 -- Timer Interrupt Flag 2
Bit 7 TOF RESET: 0 6 RTIF 0 5 PAOVF 0 4 PAIF 0 3 0 0 2 0 0 1 0 0
$1025
Bit 0 0 0
Clear flags by writing a one to the corresponding bit position(s). TOF -- Timer Overflow Flag Set when TCNT changes from $FFFF to $0000. RTIF -- Real-Time (Periodic) Interrupt Flag Set periodically. Refer to RTR[1:0] bits in PACTL register. PAOVF -- Pulse Accumulator Overflow Interrupt Flag Refer to 9 Pulse Accumulator. PAIF -- Pulse Accumulator Input Edge Interrupt Flag Refer to 9 Pulse Accumulator. PACTL -- Pulse Accumulator Control
Bit 7 DDRA7 RESET: 0 6 PAEN 0 5 PAMOD 0 4 PEDGE 0 3 0 0 2 0 0 1 RTR1 0
$1026
Bit 0 RTR0 0
DDRA7 -- Data Direction for Port A Bit 7 Refer to 5 Parallel Input/Output. PAEN -- Pulse Accumulator Enable Refer to 9 Pulse Accumulator. PAMOD -- Pulse Accumulator Mode Select Refer to 9 Pulse Accumulator. PEDGE -- Pulse Accumulator Edge Select Refer to 9 Pulse Accumulator. RTR [1:0] -- Real-Time Interrupt (RTI) Rate Table 8 Real-Time Interrupt Rates
RTR[1:0] 00 01 10 11 Divide E By 2
13
XTAL = 4.0 MHz 8.19 ms 16.38 ms 32.77 ms 65.54 ms 1.0 MHz
XTAL = 8.0 MHz 4.096 ms 8.192 ms 16.384 ms 32.768 ms 2.0 MHz
XTAL = 12.0 MHz 2.731 ms 5.461 ms 10.923 ms 21.845 ms 3.0 MHz
214 215 216 E=
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 37
9 Pulse Accumulator
The MC68HC11A8 has an 8-bit counter that can be configured to operate as a simple event counter or for gated time accumulation, depending on the PAMOD bit in the PACTL register. The pulse accumulator counter can be read or written at any time. The port A bit 7 I/O pin can be configured as a clock in event counting mode, or as a gate signal to enable a free-running clock (E divided by 64) in gated time accumulation mode. Table 9 Pulse Accumulator Timing
Common XTAL Frequencies Selected Crystal CPU Clock Cycle Time (E/26) (E/214) (E) (1/E) 1 count -- overflow -- 4.0 MHz 1.0 MHz 1000 ns 64.0 s 16.384 ms 8.0 MHz 2.0 MHz 500 ns 32.0 s 8.192 ms 12.0 MHz 3.0 MHz 333 ns 21.33 s 5.461 ms
Pulse Accumulator (in Gated Mode)
PAOVI PAOVF
1 INTERRUPT REQUESTS 2
PAII PAIF PAOVF PAIF TFLG2 INTERRUPT STATUS PAI EDGE PAEN DISABLE FLAG SETTING OVERFLOW MCU PIN PA7/ PAI/ OC1 INPUT BUFFER AND EDGE DETECTOR OUTPUT BUFFER FROM MAIN TIMER OC1 FROM DDRA7 2:1 MUX DATA BUS PAEN CLOCK PAOVI PAII TMSK2 INT ENABLES E / 64 CLOCK (FROM MAIN TIMER)
PACNT 8-BIT COUNTER ENABLE
PAEN PAMOD PEDGE PACTL CONTROL INTERNAL DATA BUS
PULSE ACC BLOCK
Figure 12 Pulse Accumulator System Block Diagram
MOTOROLA 38
MC68HC11A8 MC68HC11A8TS/D
TMSK2 -- Timer Interrupt Mask 2
Bit 7 TOI RESET: 0 6 RTII 0 5 PAOVI 0 4 PAII 0 3 0 0 2 0 0 1 PR1 0
$1024
Bit 0 PR0 0
TOI -- Timer Overflow Interrupt Enable Refer to 8 Main Timer. RTII -- Real-Time Interrupt Enable Refer to 8 Main Timer. PAOVI -- Pulse Accumulator Overflow Interrupt Enable 0 = PAOVF interrupts disabled 1 = Interrupt requested when RTIF is set to one PAII -- Pulse Accumulator Input Edge Interrupt Enable 0 = PAIF interrupts disabled 1 = Interrupt requested when PAIF is set to one PR1, PR0 -- Timer Prescaler Select Refer to 8 Main Timer. NOTE Bits in TMSK2 correspond bit for bit with flag bits in TFLG2. Ones in TMSK2 enable the corresponding interrupt sources. TFLG2 -- Timer Interrupt Flag 2
Bit 7 TOF RESET: 0 6 RTIF 0 5 PAOVF 0 4 PAIF 0 3 0 0 2 0 0 1 0 0
$1025
Bit 0 0 0
Clear flags by writing a one to the corresponding bit position(s). TOF -- Timer Overflow Flag Refer to 8 Main Timer. RTIF -- Real-Time Interrupt Flag Refer to 8 Main Timer. PAOVF -- Pulse Accumulator Overflow Flag Set when PACNT changes from $FF to $00. PAIF -- Pulse Accumulator Input Edge Flag Set each time a selected active edge is detected on the PAI input line. PACTL -- Pulse Accumulator Control
Bit 7 DDRA7 RESET: 0 6 PAEN 0 5 PAMOD 0 4 PEDGE 0 3 0 0 2 0 0 1 RTR1 0
$1026
Bit 0 RTR0 0
DDRA7 -- Data Direction for Port A Bit 7 Refer to 5 Parallel Input/Output.
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 39
PAEN -- Pulse Accumulator System Enable 0 = Pulse Accumulator disabled 1 = Pulse Accumulator enabled PAMOD -- Pulse Accumulator Mode 0 = Event counter 1 = Gated time accumulation PEDGE -- Pulse Accumulator Edge Control
PAMOD 0 0 1 1 PEDGE 0 1 0 1 Action on Clock PAI falling edge increments the counter PAI rising edge increments the counter A zero on PAI inhibits counting A one on PAI inhibits counting
RTR1 and RTR0 -- Real-Time Interrupt (RTI) Rate Refer to 8 Main Timer. PACNT -- Pulse Accumulator Counter
Bit 7 Bit 7 RESET: 0 6 6 0 5 5 0 4 4 0 3 3 0 2 2 0 1 1 0
$1027
Bit 0 Bit 0 0
Can be read and written.
MOTOROLA 40
MC68HC11A8 MC68HC11A8TS/D
10 Analog-to-Digital Converter
The A/D converter system uses an all capacitive charge redistribution technique to convert analog signals to digital values. The MC68HC11A8 A/D system is an 8-channel, 8-bit, multiplexed-input, successive-approximation converter and is accurate to 1 least significant bit (LSB). It does not require external sample and hold circuits because of the type of charge redistribution technique used. Dedicated lines VRH and VRL provide the reference supply voltage inputs. Refer to the A/D converter block diagram. A multiplexer allows the single A/D converter to select one of 16 analog signals, as shown in the ADCTL register description.
PE0 AN0 PE1 AN1 PE2 AN2 PE3 AN3 PE4 AN4 PE5 AN5 PE6 AN6 ANALOG MUX 8-BIT CAPACITIVE DAC WITH SAMPLE AND HOLD
VRH
VRL
SUCCESSIVE APPROXIMATION REGISTER AND CONTROL RESULT
INTERNAL DATA BUS
CCF
SCAN MULT CD CC CB
PE7 AN7
ADCTL A/D CONTROL
RESULT REGISTER INTERFACE
ADR1 A/D RESULT 1
ADR2 A/D RESULT 2
ADR3 A/D RESULT 3
ADR4 A/D RESULT 4
CA
EA9 A/D BLOCK
Figure 13 A/D Converter Block Diagram
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 41
E CLOCK MSB 4 CYCLES BIT 6 2 CYC BIT 5 2 CYC BIT 4 2 CYC BIT 3 2 CYC BIT 2 2 CYC BIT 1 2 CYC LSB 2 CYC 2 CYC END
12 E CYCLES WRITE TO ADCTL
SAMPLE ANALOG INPUT
SUCCESSIVE APPROXIMATION SEQUENCE
0
CONVERT FIRST CHANNEL, UPDATE ADR1
32
CONVERT SECOND CHANNEL, UPDATE ADR2
64
CONVERT THIRD CHANNEL, UPDATE ADR3
96
CONVERT FOURTH CHANNEL, UPDATE ADR4
128 -- E CYCLES
A/D CONVERSION TIM
Figure 14 A/D Conversion Sequence
ANALOG INPUT PIN
DIFFUSION/POLY COUPLER + ~20V - ~0.7V + ~12V - ~0.7V
DUMMY N-CHANNEL OUTPUT DEVICE
4 K 400 nA JUNCTION LEAKAGE
*
~ 20 pF DAC CAPACITANCE
< 2 pF
INPUT PROTECTION DEVICE
VRL
* THIS ANALOG SWITCH IS CLOSED ONLY DURING THE 12-CYCLE SAMPLE TIME.
ANALOG INPUT PIN
Figure 15 Electrical Model of an Analog Input Pin (Sample Mode)
ADCTL -- A/D Control/Status
Bit 7 CCF RESET: U 6 0 0 5 SCAN U 4 MULT U 3 CD U 2 CC U 1 CB U
$1030
Bit 0 CA U
CCF -- Conversions Complete Flag Set after an A/D conversion cycle. Cleared when ADCTL is written. SCAN -- Continuous Scan Control 0 = Do four conversions and stop 1 = Convert four channels in selected group continuously MULT -- Multiple Channel/Single Channel Control 0 = Convert single channel selected 1 = Convert four channels in selected group
MOTOROLA 42
MC68HC11A8 MC68HC11A8TS/D
REPEAT SEQUENCE, SCAN = 1
SET CC FLAG
CD-CA -- Channel Select D through A Table 10 A/D Converter Channel Assignments
Channel Select Control Bits CD 0 0 0 0 0 0 0 0 1 1 1 1 1 CC 0 0 0 0 1 1 1 1 0 1 1 1 1 CB 0 0 1 1 0 0 1 1 X 0 0 1 1 CA 0 1 0 1 0 1 0 1 X 0 1 0 1 Channel Signal AN0 AN1 AN2 AN3 AN4* AN5* AN6* AN7* Reserved VRH** VRL** (VRH)/2** Reserved** Result in ADRx if MULT = 1 ADR1 ADR2 ADR3 ADR4 ADR1 ADR2 ADR3 ADR4 ADR1-ADR4 ADR1 ADR2 ADR3 ADR4
* Not available in 48-pin package **Used for factory testing
ADR1-ADR4 -- A/D Results
Bit 7 $1031 $1032 $1033 $1034 Bit 7 Bit 7 Bit 7 Bit 7 6 6 6 6 6 5 5 5 5 5 4 4 4 4 4 3 3 3 3 3 2 2 2 2 2 1 1 1 1 1
$1031-$1034
Bit 0 Bit 0 Bit 0 Bit 0 Bit 0 ADR1 ADR2 ADR3 ADR4
Table 11 Analog Input to 8-Bit Result Translation Table
Bit 7 %
(1)
6 25% 1.250
(2) V RL
5 12.5% 0.625
4 6.25% 0.3125
3 3.12% 0.1562
2 1.56% 0.0781
1 0.78% 0.0391
Bit 0 0.39% 0.0195
50% 2.500
Volts (2)
(1)
% of VRH-VRL
= 0.0 V; VRH = 5.0 V
OPTION -- System Configuration Options
Bit 7 ADPU RESET: 0 6 CSEL 0 5 IRQE* 0 4 DLY* 1 3 CME 0 2 0 0 1 CR1* 0
$1039
Bit 0 CR0* 0
*Can be written only once in first 64 cycles out of reset in normal modes, or any time in special modes.
ADPU -- A/D Power Up 0 = A/D Converter powered down 1 = A/D Converter powered up CSEL -- Clock Select 0 = A/D and EEPROM use system E clock 1 = A/D and EEPROM use internal RC clock
MC68HC11A8 MC68HC11A8TS/D
MOTOROLA 43
IRQE -- IRQ Select Edge Sensitive Only Refer to 3 Resets and Interrupts. DLY -- Enable Oscillator Start-Up Delay on Exit from STOP Refer to 3 Resets and Interrupts. CME -- Clock Monitor Enable Refer to 3 Resets and Interrupts. CR1, CR0 -- COP Timer Rate Select Refer to 3 Resets and Interrupts.
MOTOROLA 44
MC68HC11A8 MC68HC11A8TS/D
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters can and do vary in different applications. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and B are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
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