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ST7LITE0, ST7SUPERLITE 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI s Memories - 1K or 1.5K bytes single voltage Flash Program memory with read-out protection, In-Circuit and In-Application Programming (ICP and IAP). 10K write/erase cycles guaranteed, data retention: 20 years at 55C. - 128 bytes RAM. - 128 bytes data EEPROM with read-out protection. 300K write/erase cycles guaranteed, data retention: 20 years at 55C. Clock, Reset and Supply Management - 3-level low voltage supervisor (LVD) and auxiliary voltage detector (AVD) for safe poweron/off procedures - Clock sources: internal 1MHz RC 1% oscillator or external clock - PLL x4 or x8 for 4 or 8 MHz internal clock - Four Power Saving Modes: Halt, Active-Halt, Wait and Slow Interrupt Management - 10 interrupt vectors plus TRAP and RESET - 4 external interrupt lines (on 4 vectors) I/O Ports - 13 multifunctional bidirectional I/O lines - 9 alternate function lines - 6 high sink outputs 2 Timers - One 8-bit Lite Timer (LT) with prescaler including: watchdog, 1 realtime base and 1 input capture. DIP16 s SO16 150" - One 12-bit Auto-reload Timer (AT) with output compare function and PWM s 1 Communication Interface - SPI synchronous serial interface A/D Converter - 8-bit resolution for 0 to V DD - Fixed gain Op-amp for 11-bit resolution in 0 to 250 mV range (@ 5V VDD) - 5 input channels Instruction Set - 8-bit data manipulation - 63 basic instructions - 17 main addressing modes - 8 x 8 unsigned multiply instruction Development Tools - Full hardware/software development package s s s s s s Device Summary Features Program memory - bytes RAM (stack) - bytes Data EEPROM - bytes Peripherals Operating Supply CPU Frequency Operating Temperature Packages ST7SUPERLITE ST7LITES2 ST7LITES5 ST7LITE02 ST7LITE0 ST7LITE05 ST7LITE09 1K 1K 1.5K 128 (64) 128 (64) 128 (64) LT Timer w/ Wdg, LT Timer w/ Wdg, LT Timer w/ Wdg, AT Timer w/ 1 PWM, AT Timer w/ 1 PWM, AT Timer w/ 1 PWM, SPI SPI, 8-bit ADC SPI 2.4V to 5.5V 1MHz RC 1% + PLLx4/8MHz -40C to +85C SO16 150", DIP16 1.5K 1.5K 128 (64) 128 (64) 128 LT Timer w/ Wdg, AT Timer w/ 1 PWM, SPI, 8-bit ADC w/ Op-Amp Rev. 2.4 August 2003 1/122 1 Table of Contents ST7LITE0, ST7SUPERLITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 REGISTER & MEMORY MAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4 FLASH PROGRAM MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 4.3 4.4 4.5 4.6 4.7 MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 PROGRAMMING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 ICC INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 MEMORY PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 RELATED DOCUMENTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 REGISTER DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 DATA EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.2 5.3 5.4 5.5 5.6 5.7 MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MEMORY ACCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 POWER SAVING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 ACCESS ERROR HANDLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 DATA EEPROM READ-OUT PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 REGISTER DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6 CENTRAL PROCESSING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6.2 6.3 MAIN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 CPU REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7 SUPPLY, RESET AND CLOCK MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.1 INTERNAL RC OSCILLATOR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.2 7.3 7.4 7.5 PHASE LOCKED LOOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 REGISTER DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 RESET SEQUENCE MANAGER (RSM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 SYSTEM INTEGRITY MANAGEMENT (SI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 8 INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 8.1 NON MASKABLE SOFTWARE INTERRUPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 8.2 8.3 EXTERNAL INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 PERIPHERAL INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 9 POWER SAVING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 9.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 9.2 9.3 9.4 SLOW MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 122 WAIT MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ACTIVE-HALT AND HALT MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 2/122 2 Table of Contents 10 I/O PORTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 10.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 10.2 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 10.3 UNUSED I/O PINS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 10.4 LOW POWER MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 10.5 INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 10.6 I/O PORT IMPLEMENTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 11 ON-CHIP PERIPHERALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 11.1 LITE TIMER (LT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 11.2 12-BIT AUTORELOAD TIMER (AT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 11.3 SERIAL PERIPHERAL INTERFACE (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 11.4 8-BIT A/D CONVERTER (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 12 INSTRUCTION SET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 12.1 ST7 ADDRESSING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 12.2 INSTRUCTION GROUPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 13 ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 13.1 PARAMETER CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 13.2 ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 13.3 OPERATING CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 13.4 SUPPLY CURRENT CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 13.5 CLOCK AND TIMING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 13.6 MEMORY CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 13.7 EMC CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 13.8 I/O PORT PIN CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 13.9 CONTROL PIN CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 13.10 COMMUNICATION INTERFACE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . 100 13.11 8-BIT ADC CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 14 PACKAGE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 14.1 PACKAGE MECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 14.2 THERMAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 14.3 SOLDERING AND GLUEABILITY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 15 DEVICE CONFIGURATION AND ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . 109 15.1 OPTION BYTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 15.2 DEVICE ORDERING INFORMATION AND TRANSFER OF CUSTOMER CODE . . . . 111 15.3 DEVELOPMENT TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 15.4 ST7 APPLICATION NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 16 IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 16.1 EXECUTION OF BTJX INSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 16.2 IN-CIRCUIT PROGRAMMING OF DEVICES PREVIOUSLY PROGRAMMED WITH HARDWARE WATCHDOG OPTION 116 16.3 IN-CIRCUIT DEBUGGING WITH HARDWARE WATCHDOG . . . . . . . . . . . . . . . . . . . 116 17 SUMMARY OF CHANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 3/122 3 Table of Contents ERRATA SHEET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 18 SILICON IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 REFERENCE SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 SILICON limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.1 NEGATIVE INJECTION IMPACT ON ADC ACCURACY . . . . . . . . . . . . . . . . . . . . . . . 118 118 118 118 20.2 ADC CONVERSION SPURIOUS RESULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 20.3 FUNCTIONAL ESD SENSITIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 21 Device Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 22 ERRATA SHEET REVISION History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 To obtain the most recent version of this datasheet, please check at www.st.com>products>technical literature>datasheet Please note that an errata sheet can be found at the end of this document on page 118 and pay special attention to the Section "IMPORTANT NOTES" on page 116. 4/122 1 ST7LITE0, ST7SUPERLITE 1 INTRODUCTION The ST7LITE0 and ST7SUPERLITE are members of the ST7 microcontroller family. All ST7 devices are based on a common industry-standard 8-bit core, featuring an enhanced instruction set. The ST7LITE0 and ST7SUPERLITE feature FLASH memory with byte-by-byte In-Circuit Programming (ICP) and In-Application Programming (IAP) capability. Under software control, the ST7LITE0 and ST7SUPERLITE devices can be placed in WAIT, SLOW, or HALT mode, reducing power consumption when the application is in idle or standby state. The enhanced instruction set and addressing modes of the ST7 offer both power and flexibility to software developers, enabling the design of highly efficient and compact application code. In addition to standard 8-bit data management, all ST7 microcontrollers feature true bit manipulation, 8x8 unsigned multiplication and indirect addressing modes. For easy reference, all parametric data are located in section 13 on page 78. Figure 1. General Block Diagram 1 MHz. RC OSC + PLL x 4 or x 8 LVD/AVD VDD VSS RESET POWER SUPPLY Internal CLOCK LITE TIMER w/ WATCHDOG PORT A ADDRESS AND DATA BUS PA7:0 (8 bits) CONTROL 8-BIT CORE ALU 12-BIT AUTORELOAD TIMER SPI PB4:0 (5 bits) FLASH MEMORY (1 or 1.5K Bytes) PORT B 8-BIT ADC RAM (128 Bytes) DATA EEPROM (128 Bytes) 5/122 1 ST7LITE0, ST7SUPERLITE 2 PIN DESCRIPTION Figure 2. 16-Pin Package Pinout (150mil) VSS VDD RESET SS/AIN0/PB0 SCK/AIN1/PB1 MISO/AIN2/PB2 MOSI/AIN3/PB3 CLKIN/AIN4/PB4 1 2 3 4 ei3 5 6 7 ei2 8 ei0 16 15 14 13 12 11 10 ei1 9 PA0 (HS)/LTIC PA1 (HS) PA2 (HS)/ATPWM0 PA3 (HS) PA4 (HS) PA5 (HS)/ICCDATA PA6/MCO/ICCCLK PA7 (HS) 20mA high sink capability eix associated external interrupt vector 6/122 1 ST7LITE0, ST7SUPERLITE PIN DESCRIPTION (Cont'd) Legend / Abbreviations for Table 1: Type: I = input, O = output, S = supply In/Output level: C= CMOS 0.15V DD/0.85VDD with input trigger CT= CMOS 0.3VDD/0.7VDD with input trigger Output level: HS = 20mA high sink (on N-buffer only) Port and control configuration: - Input: float = floating, wpu = weak pull-up, int = interrupt 1), ana = analog - Output: OD = open drain 2), PP = push-pull Table 1. Device Pin Description Level Output Input Pin n Type Pin Name Port / Control Input float wpu ana int Output OD PP Main Function (after reset) Ground Main power supply CT CT CT CT CT CT CT X X X X X X X ei1 X X ei2 X ei3 X X X X X X X X X X X X X Top priority non maskable interrupt (active low) Port B0 Port B1 Port B2 Port B3 Port B4 Port A7 Main Clock Output/In Circuit Communication Clock. Caution: During reset, this pin must be held at high level to avoid entering ICC mode unexpectedly (this is guaranteed by the internal pull-up if the application leaves the pin floating). In Circuit Communication Data ADC Analog Input 0 or SPI Slave Select (active low) ADC Analog Input 1 or SPI Clock ADC Analog Input 2 or SPI Master In/ Slave Out Data ADC Analog Input 3 or SPI Master Out / Slave In Data ADC Analog Input 4 or External clock input Alternate Function 1 2 3 4 5 6 7 8 9 VSS VDD RESET PB0/AIN0/SS PB1/AIN1/SCK PB2/AIN2/MISO PB3/AIN3/MOSI PB4/AIN4/CLKIN PA7 S S I/O I/O I/O I/O I/O I/O I/O 10 PA6 /MCO/ICCCLK I/O CT X X X X Port A6 11 PA5/ ICCDATA I/O CT HS I/O CT HS I/O CT HS I/O CT HS I/O CT HS I/O CT HS X X X X X X X X X X X ei0 X X X X X X X X X X X X Port A5 Port A4 Port A3 Port A2 Port A1 Port A0 12 PA4 13 PA3 14 PA2/ATPWM0 15 PA1 16 PA0/LTIC Auto-Reload Timer PWM0 Lite Timer Input Capture Note: In the interrupt input column, "eix" defines the associated external interrupt vector. If the weak pull-up column (wpu) is merged with the interrupt column (int), then the I/O configuration is pull-up interrupt input, else the configuration is floating interrupt input. 7/122 1 ST7LITE0, ST7SUPERLITE 3 REGISTER & MEMORY MAP As shown in Figure 3 and Figure 4, the MCU is capable of addressing 64K bytes of memories and I/ O registers. The available memory locations consist of up to 128 bytes of register locations, 128 bytes of RAM, 128 bytes of data EEPROM and up to 1.5 Kbytes of user program memory. The RAM space includes up to 64 bytes for the stack from 0C0h to 0FFh. The highest address bytes contain the user reset and interrupt vectors. The size of Flash Sector 0 is configurable by Option byte. IMPORTANT: Memory locations marked as "Reserved" must never be accessed. Accessing a reseved area can have unpredictable effects on the device. Figure 3. Memory Map (ST7LITE0) 0000h 007Fh 0080h 00FFh 0100h HW Registers (see Table 2) RAM (128 Bytes) Reserved 0080h Short Addressing RAM (zero page) 00BFh 00C0h 64 Bytes Stack 00FFh 1000h 0FFFh 1000h 107Fh 1080h RCCR0 RCCR1 Data EEPROM (128 Bytes) 1001h see section 7.1 on page 23 1.5K FLASH PROGRAM MEMORY Reserved F9FFh FA00h FA00h Flash Memory (1.5K) FFDFh FFE0h FBFFh FC00h FFFFh 0.5 Kbytes SECTOR 1 1 Kbytes SECTOR 0 FFDEh Interrupt & Reset Vectors (see Table 7) RCCR0 RCCR1 FFFFh FFDFh see section 7.1 on page 23 8/122 1 ST7LITE0, ST7SUPERLITE REGISTER AND MEMORY MAP (Cont'd) Figure 4. Memory Map (ST7SUPERLITE) 0000h 007Fh 0080h 00FFh 0100h HW Registers (see Table 2) RAM (128 Bytes) 0080h Short Addressing RAM (zero page) 00BFh 00C0h 64 Bytes Stack 00FFh Reserved 1K FLASH PROGRAM MEMORY FBFFh FC00h FC00h Flash Memory (1K) FFDFh FFE0h FDFFh FE00h FFFFh 0.5 Kbytes SECTOR 1 0.5 Kbytes SECTOR 0 Interrupt & Reset Vectors (see Table 7) FFDEh RCCR0 RCCR1 FFFFh FFDFh see section 7.1 on page 23 9/122 1 ST7LITE0, ST7SUPERLITE REGISTER AND MEMORY MAP (Cont'd) Legend: x=undefined, R/W=read/write Table 2. Hardware Register Map Address 0000h 0001h 0002h 0003h 0004h 0005h 0006h to 000Ah 000Bh 000Ch 000Dh 000Eh 000Fh 0010h 0011h 0012h 0013h 0014h to 0016h 0017h 0018h 0019h to 002Eh 0002Fh 00030h 0031h 0032h 0033h 0034h 0035h 0036h 0037h 0038h 0039h FLASH EEPROM SPI FCSR EECSR SPIDR SPICR SPICSR ADCCSR ADCDAT ADCAMP EICR MCCSR RCCR AUTO-RELOAD DCR0H TIMER DCR0L LITE TIMER LTCSR LTICR Block Register Label PADR PADDR PAOR PBDR PBDDR PBOR Register Name Port A Data Register Port A Data Direction Register Port A Option Register Port B Data Register Port B Data Direction Register Port B Option Register Reserved area (5 bytes) Lite Timer Control/Status Register Lite Timer Input Capture Register Timer Control/Status Register Counter Register High Counter Register Low Auto-Reload Register High Auto-Reload Register Low PWM Output Control Register PWM 0 Control/Status Register Reserved area (3 bytes) PWM 0 Duty Cycle Register High PWM 0 Duty Cycle Register Low Reserved area (22 bytes) Flash Control/Status Register Data EEPROM Control/Status Register SPI Data I/O Register SPI Control Register SPI Control/Status Register A/D Control Status Register A/D Data Register A/D Amplifier Control Register External Interrupt Control Register Main Clock Control/Status Register RC oscillator Control Register 00h 00h xxh 0xh 00h 00h 00h 00h 00h 00h FFh R/W R/W R/W R/W R/W R/W Read Only R/W R/W R/W R/W 00h 00h R/W R/W xxh xxh 00h 00h 00h 00h 00h 00h 00h R/W Read Only R/W Read Only Read Only R/W R/W R/W R/W Reset Status 00h1) 00h 40h E0h 1) 00h 00h Remarks R/W R/W R/W R/W R/W R/W2) Port A Port B ATCSR CNTRH CNTRL AUTO-RELOAD ATRH TIMER ATRL PWMCR PWM0CSR ADC ITC CLOCKS 10/122 1 ST7LITE0, ST7SUPERLITE Address 003Ah 003Bh to 007Fh Block SI Register Label SICSR Register Name System Integrity Control/Status Register Reserved area (45 bytes) Reset Status 0xh Remarks R/W Notes: 1. The contents of the I/O port DR registers are readable only in output configuration. In input configuration, the values of the I/O pins are returned instead of the DR register contents. 2. The bits associated with unavailable pins must always keep their reset value. 11/122 1 ST7LITE0, ST7SUPERLITE 4 FLASH PROGRAM MEMORY 4.1 Introduction The ST7 single voltage extended Flash (XFlash) is a non-volatile memory that can be electrically erased and programmed either on a byte-by-byte basis or up to 32 bytes in parallel. The XFlash devices can be programmed off-board (plugged in a programming tool) or on-board using In-Circuit Programming or In-Application Programming. The array matrix organisation allows each sector to be erased and reprogrammed without affecting other sectors. 4.2 Main Features s s s s s ICP (In-Circuit Programming) IAP (In-Application Programming) ICT (In-Circuit Testing) for downloading and executing user application test patterns in RAM Sector 0 size configurable by option byte Read-out and write protection against piracy 4.3 PROGRAMMING MODES The ST7 can be programmed in three different ways: - Insertion in a programming tool. In this mode, FLASH sectors 0 and 1, option byte row and data EEPROM can be programmed or erased. - In-Circuit Programming. In this mode, FLASH sectors 0 and 1, option byte row and data EEPROM can be programmed or erased without removing the device from the application board. - In-Application Programming. In this mode, sector 1 and data EEPROM can be programmed or erased without removing the device from the application board and while the application is running. 4.3.1 In-Circuit Programming (ICP) ICP uses a protocol called ICC (In-Circuit Communication) which allows an ST7 plugged on a printed circuit board (PCB) to communicate with an external programming device connected via cable. ICP is performed in three steps: Switch the ST7 to ICC mode (In-Circuit Communications). This is done by driving a specific signal sequence on the ICCCLK/DATA pins while the RESET pin is pulled low. When the ST7 enters ICC mode, it fetches a specific RESET vector which points to the ST7 System Memory containing the ICC protocol routine. This routine enables the ST7 to receive bytes from the ICC interface. - Download ICP Driver code in RAM from the ICCDATA pin - Execute ICP Driver code in RAM to program the FLASH memory Depending on the ICP Driver code downloaded in RAM, FLASH memory programming can be fully customized (number of bytes to program, program locations, or selection of the serial communication interface for downloading). 4.3.2 In Application Programming (IAP) This mode uses an IAP Driver program previously programmed in Sector 0 by the user (in ICP mode). This mode is fully controlled by user software. This allows it to be adapted to the user application, (user-defined strategy for entering programming mode, choice of communications protocol used to fetch the data to be stored etc.) IAP mode can be used to program any memory areas except Sector 0, which is write/erase protected to allow recovery in case errors occur during the programming operation. 12/122 1 ST7LITE0, ST7SUPERLITE FLASH PROGRAM MEMORY (Cont'd) 4.4 ICC interface ICP needs a minimum of 4 and up to 6 pins to be connected to the programming tool. These pins are: - RESET: device reset - VSS: device power supply ground - ICCCLK: ICC output serial clock pin - ICCDATA: ICC input serial data pin - CLKIN: main clock input for external source - VDD: application board power supply (optional, see Note 3) Notes: 1. If the ICCCLK or ICCDATA pins are only used as outputs in the application, no signal isolation is necessary. As soon as the Programming Tool is plugged to the board, even if an ICC session is not in progress, the ICCCLK and ICCDATA pins are not available for the application. If they are used as inputs by the application, isolation such as a serial resistor has to be implemented in case another device forces the signal. Refer to the Programming Tool documentation for recommended resistor values. 2. During the ICP session, the programming tool must control the RESET pin. This can lead to conflicts between the programming tool and the appliFigure 5. Typical ICC Interface PROGRAMMING TOOL ICC CONNECTOR ICC Cable OPTIONAL (See Note 3) OPTIONAL (See Note 4) ICC CONNECTOR HE10 CONNECTOR TYPE APPLICATION BOARD cation reset circuit if it drives more than 5mA at high level (push pull output or pull-up resistor<1K). A schottky diode can be used to isolate the application RESET circuit in this case. When using a classical RC network with R>1K or a reset management IC with open drain output and pull-up resistor>1K, no additional components are needed. In all cases the user must ensure that no external reset is generated by the application during the ICC session. 3. The use of Pin 7 of the ICC connector depends on the Programming Tool architecture. This pin must be connected when using most ST Programming Tools (it is used to monitor the application power supply). Please refer to the Programming Tool manual. 4. Pin 9 has to be connected to the CLKIN pin of the ST7 when the clock is not available in the application or if the selected clock option is not programmed in the option byte. 5. During reset, this pin must be held at high level to avoid entering ICC mode unexpectedly (this is guaranteed by the internal pull-up if the application leaves the pin floating). 9 10 7 8 5 6 3 4 1 2 APPLICATION RESET SOURCE See Note 2 APPLICATION POWER SUPPLY See Notes 1 and 5 APPLICATION I/O See Note 1 CLKIN VDD RESET ICCCLK ICCDATA ST7 13/122 1 ST7LITE0, ST7SUPERLITE FLASH PROGRAM MEMORY (Cont'd) 4.5 Memory Protection There are two different types of memory protection: Read Out Protection and Write/Erase Protection which can be applied individually. 4.5.1 Read out Protection Read out protection, when selected, makes it impossible to extract the memory content from the microcontroller, thus preventing piracy. Both program and data E2 memory are protected. In flash devices, this protection is removed by reprogramming the option. In this case, both program and data E2 memory are automatically erased, and the device can be reprogrammed. Read-out protection selection depends on the device type: - In Flash devices it is enabled and removed through the FMP_R bit in the option byte. - In ROM devices it is enabled by mask option specified in the Option List. 4.5.2 Flash Write/Erase Protection Write/erase protection, when set, makes it impossible to both overwrite and erase program memory. It does not apply to E2 data. Its purpose is to provide advanced security to applications and prevent any change being made to the memory content. Warning: Once set, Write/erase protection can never be removed. A write-protected flash device is no longer reprogrammable. Write/erase protection is enabled through the FMP_W bit in the option byte. Table 3. FLASH Register Map and Reset Values Address (Hex.) 002Fh Register Label FCSR Reset Value 0 0 0 0 0 7 6 5 4 3 2 OPT 0 1 LAT 0 0 PGM 0 4.6 Related Documentation For details on Flash programming and ICC protocol, refer to the ST7 Flash Programming Reference Manual and to the ST7 ICC Protocol Reference Manual. 4.7 Register Description FLASH CONTROL/STATUS REGISTER (FCSR) Read /Write Reset Value: 000 0000 (00h) 1st RASS Key: 0101 0110 (56h) 2nd RASS Key: 1010 1110 (AEh) 7 0 0 0 0 0 OPT LAT 0 PGM Note: This register is reserved for programming using ICP, IAP or other programming methods. It controls the XFlash programming and erasing operations. When an EPB or another programming tool is used (in socket or ICP mode), the RASS keys are sent automatically. 14/122 1 ST7LITE0, ST7SUPERLITE 5 DATA EEPROM 5.1 INTRODUCTION The Electrically Erasable Programmable Read Only Memory can be used as a non volatile backup for storing data. Using the EEPROM requires a basic access protocol described in this chapter. 5.2 MAIN FEATURES s s s s s s Up to 32 Bytes programmed in the same cycle EEPROM mono-voltage (charge pump) Chained erase and programming cycles Internal control of the global programming cycle duration WAIT mode management Readout protection against piracy Figure 6. EEPROM Block Diagram HIGH VOLTAGE PUMP EECSR 0 0 0 0 0 0 E2LAT E2PGM ADDRESS DECODER 4 ROW DECODER EEPROM MEMORY MATRIX (1 ROW = 32 x 8 BITS) 128 DATA MULTIPLEXER 4 128 32 x 8 BITS DATA LATCHES 4 ADDRESS BUS DATA BUS 15/122 1 ST7LITE0, ST7SUPERLITE DATA EEPROM (Cont'd) 5.3 MEMORY ACCESS The Data EEPROM memory read/write access modes are controlled by the E2LAT bit of the EEPROM Control/Status register (EECSR). The flowchart in Figure 7 describes these different memory access modes. Read Operation (E2LAT=0) The EEPROM can be read as a normal ROM location when the E2LAT bit of the EECSR register is cleared. In a read cycle, the byte to be accessed is put on the data bus in less than 1 CPU clock cycle. This means that reading data from EEPROM takes the same time as reading data from EPROM, but this memory cannot be used to execute machine code. Write Operation (E2LAT=1) To access the write mode, the E2LAT bit has to be set by software (the E2PGM bit remains cleared). When a write access to the EEPROM area occurs, Figure 7. Data EEPROM Programming Flowchart the value is latched inside the 32 data latches according to its address. When PGM bit is set by the software, all the previous bytes written in the data latches (up to 32) are programmed in the EEPROM cells. The effective high address (row) is determined by the last EEPROM write sequence. To avoid wrong programming, the user must take care that all the bytes written between two programming sequences have the same high address: only the five Least Significant Bits of the address can change. At the end of the programming cycle, the PGM and LAT bits are cleared simultaneously. Note: Care should be taken during the programming cycle. Writing to the same memory location will over-program the memory (logical AND between the two write access data result) because the data latches are only cleared at the end of the programming cycle and by the falling edge of the E2LAT bit. It is not possible to read the latched data. This note is ilustrated by the Figure 9. READ MODE E2LAT=0 E2PGM=0 WRITE MODE E2LAT=1 E2PGM=0 READ BYTES IN EEPROM AREA WRITE UP TO 32 BYTES IN EEPROM AREA (with the same 11 MSB of the address) START PROGRAMMING CYCLE E2LAT=1 E2PGM=1 (set by software) 0 CLEARED BY HARDWARE E2LAT 1 16/122 1 ST7LITE0, ST7SUPERLITE DATA EEPROM (Cont'd) Figure 8. Data E2PROM Write Operation Row / Byte ROW DEFINITION 0 1 2 3 ... 30 31 Physical Address 0 1 ... N Read operation impossible 00h...1Fh 20h...3Fh Nx20h...Nx20h+1Fh Read operation possible Byte 1 Byte 2 PHASE 1 Byte 32 Programming cycle PHASE 2 Writing data latches E2LAT bit Set by USER application Waiting E2PGM and E2LAT to fall Cleared by hardware E2PGM bit Note: If a programming cycle is interrupted (by software or a reset action), the integrity of the data in memory is not guaranteed. 17/122 1 ST7LITE0, ST7SUPERLITE DATA EEPROM (Cont'd) 5.4 POWER SAVING MODES Wait mode The DATA EEPROM can enter WAIT mode on execution of the WFI instruction of the microcontroller or when the microcontroller enters Active-HALT mode.The DATA EEPROM will immediately enter this mode if there is no programming in progress, otherwise the DATA EEPROM will finish the cycle and then enter WAIT mode. Active-Halt mode Refer to Wait mode. Halt mode The DATA EEPROM immediately enters HALT mode if the microcontroller executes the HALT instruction. Therefore the EEPROM will stop the function in progress, and data may be corrupted. 5.5 ACCESS ERROR HANDLING If a read access occurs while E2LAT=1, then the data bus will not be driven. If a write access occurs while E2LAT=0, then the data on the bus will not be latched. If a programming cycle is interrupted (by software/ RESET action), the memory data will not be guaranteed. 5.6 Data EEPROM Read-out Protection The read-out protection is enabled through an option bit (see section 15.1 on page 109). When this option is selected, the programs and data stored in the EEPROM memory are protected against read-out piracy (including a re-write protection). In Flash devices, when this protection is removed by reprogramming the Option Byte, the entire Program memeory and EEPROM is first automatically erased. Note: Both Program Memory and data EEPROM are protected using the same option bit. Figure 9. Data EEPROM Programming Cycle READ OPERATION NOT POSSIBLE INTERNAL PROGRAMMING VOLTAGE ERASE CYCLE WRITE OF DATA LATCHES WRITE CYCLE READ OPERATION POSSIBLE tPROG LAT PGM 18/122 1 ST7LITE0, ST7SUPERLITE DATA EEPROM (Cont'd) 5.7 REGISTER DESCRIPTION EEPROM CONTROL/STATUS REGISTER (EECSR) Read /Write Reset Value: 0000 0000 (00h) 7 0 0 0 0 0 0 0 E2LAT E2PGM Bits 7:2 = Reserved, forced by hardware to 0. Bit 1 = E2LAT Latch Access Transfer This bit is set by software. It is cleared by hardware at the end of the programming cycle. It can only be cleared by software if the E2PGM bit is cleared. 0: Read mode 1: Write mode Bit 0 = E2PGM Programming control and status This bit is set by software to begin the programming cycle. At the end of the programming cycle, this bit is cleared by hardware. 0: Programming finished or not yet started 1: Programming cycle is in progress Note: if the E2PGM bit is cleared during the programming cycle, the memory data is not guaranteed Table 4. DATA EEPROM Register Map and Reset Values Address (Hex.) 0030h Register Label EECSR Reset Value 0 0 0 0 0 0 7 6 5 4 3 2 1 E2LAT 0 0 E2PGM 0 19/122 1 ST7LITE0, ST7SUPERLITE 6 CENTRAL PROCESSING UNIT 6.1 INTRODUCTION This CPU has a full 8-bit architecture and contains six internal registers allowing efficient 8-bit data manipulation. 6.2 MAIN FEATURES s s s s s s s s 63 basic instructions Fast 8-bit by 8-bit multiply 17 main addressing modes Two 8-bit index registers 16-bit stack pointer Low power modes Maskable hardware interrupts Non-maskable software interrupt 6.3 CPU REGISTERS The 6 CPU registers shown in Figure 10 are not present in the memory mapping and are accessed by specific instructions. Figure 10. CPU Registers 7 RESET VALUE = XXh 7 RESET VALUE = XXh 7 RESET VALUE = XXh 15 PCH 87 PCL 0 0 0 0 Accumulator (A) The Accumulator is an 8-bit general purpose register used to hold operands and the results of the arithmetic and logic calculations and to manipulate data. Index Registers (X and Y) In indexed addressing modes, these 8-bit registers are used to create either effective addresses or temporary storage areas for data manipulation. (The Cross-Assembler generates a precede instruction (PRE) to indicate that the following instruction refers to the Y register.) The Y register is not affected by the interrupt automatic procedures (not pushed to and popped from the stack). Program Counter (PC) The program counter is a 16-bit register containing the address of the next instruction to be executed by the CPU. It is made of two 8-bit registers PCL (Program Counter Low which is the LSB) and PCH (Program Counter High which is the MSB). ACCUMULATOR X INDEX REGISTER Y INDEX REGISTER PROGRAM COUNTER RESET VALUE = RESET VECTOR @ FFFEh-FFFFh 7 111HI 0 NZC CONDITION CODE REGISTER RESET VALUE = 1 1 1 X 1 X X X 15 87 0 STACK POINTER RESET VALUE = STACK HIGHER ADDRESS X = Undefined Value 20/122 1 ST7LITE0, ST7SUPERLITE CPU REGISTERS (Cont'd) CONDITION CODE REGISTER (CC) Read/Write Reset Value: 111x1xxx 7 1 1 1 H I N Z 0 C because the I bit is set by hardware at the start of the routine and reset by the IRET instruction at the end of the routine. If the I bit is cleared by software in the interrupt routine, pending interrupts are serviced regardless of the priority level of the current interrupt routine. Bit 2 = N Negative. This bit is set and cleared by hardware. It is representative of the result sign of the last arithmetic, logical or data manipulation. It is a copy of the 7th bit of the result. 0: The result of the last operation is positive or null. 1: The result of the last operation is negative (i.e. the most significant bit is a logic 1). This bit is accessed by the JRMI and JRPL instructions. Bit 1 = Z Zero. This bit is set and cleared by hardware. This bit indicates that the result of the last arithmetic, logical or data manipulation is zero. 0: The result of the last operation is different from zero. 1: The result of the last operation is zero. This bit is accessed by the JREQ and JRNE test instructions. The 8-bit Condition Code register contains the interrupt mask and four flags representative of the result of the instruction just executed. This register can also be handled by the PUSH and POP instructions. These bits can be individually tested and/or controlled by specific instructions. Bit 4 = H Half carry. This bit is set by hardware when a carry occurs between bits 3 and 4 of the ALU during an ADD or ADC instruction. It is reset by hardware during the same instructions. 0: No half carry has occurred. 1: A half carry has occurred. This bit is tested using the JRH or JRNH instruction. The H bit is useful in BCD arithmetic subroutines. Bit 3 = I Interrupt mask. This bit is set by hardware when entering in interrupt or by software to disable all interrupts except the TRAP software interrupt. This bit is cleared by software. 0: Interrupts are enabled. 1: Interrupts are disabled. This bit is controlled by the RIM, SIM and IRET instructions and is tested by the JRM and JRNM instructions. Note: Interrupts requested while I is set are latched and can be processed when I is cleared. By default an interrupt routine is not interruptable Bit 0 = C Carry/borrow. This bit is set and cleared by hardware and software. It indicates an overflow or an underflow has occurred during the last arithmetic operation. 0: No overflow or underflow has occurred. 1: An overflow or underflow has occurred. This bit is driven by the SCF and RCF instructions and tested by the JRC and JRNC instructions. It is also affected by the "bit test and branch", shift and rotate instructions. 21/122 1 ST7LITE0, ST7SUPERLITE CPU REGISTERS (Cont'd) Stack Pointer (SP) Read/Write Reset Value: 00 FFh 15 0 7 1 1 SP5 SP4 SP3 SP2 SP1 0 0 0 0 0 0 8 0 0 SP0 The Stack Pointer is a 16-bit register which is always pointing to the next free location in the stack. It is then decremented after data has been pushed onto the stack and incremented before data is popped from the stack (see Figure 11). Since the stack is 64 bytes deep, the 10 most significant bits are forced by hardware. Following an MCU Reset, or after a Reset Stack Pointer instruction (RSP), the Stack Pointer contains its reset value (the SP5 to SP0 bits are set) which is the stack higher address. Figure 11. Stack Manipulation Example CALL Subroutine @ 00C0h Interrupt event PUSH Y The least significant byte of the Stack Pointer (called S) can be directly accessed by a LD instruction. Note: When the lower limit is exceeded, the Stack Pointer wraps around to the stack upper limit, without indicating the stack overflow. The previously stored information is then overwritten and therefore lost. The stack also wraps in case of an underflow. The stack is used to save the return address during a subroutine call and the CPU context during an interrupt. The user may also directly manipulate the stack by means of the PUSH and POP instructions. In the case of an interrupt, the PCL is stored at the first location pointed to by the SP. Then the other registers are stored in the next locations as shown in Figure 11. - When an interrupt is received, the SP is decremented and the context is pushed on the stack. - On return from interrupt, the SP is incremented and the context is popped from the stack. A subroutine call occupies two locations and an interrupt five locations in the stack area. POP Y IRET RET or RSP SP SP CC A X PCH SP PCH @ 00FFh PCL PCL PCH PCL Y CC A X PCH PCL PCH PCL SP CC A X PCH PCL PCH PCL SP PCH PCL SP Stack Higher Address = 00FFh Stack Lower Address = 00C0h 22/122 1 ST7LITE0, ST7SUPERLITE 7 SUPPLY, RESET AND CLOCK MANAGEMENT The device includes a range of utility features for securing the application in critical situations (for example in case of a power brown-out), and reducing the number of external components. Main features s RCCR Conditions ST7FLITE02/ ST7FLITE05/ ST7FLITE09 ST7FLITES2/ Address ST7FLITES5 Address Clock Management - 1 MHz internal RC oscillator (enabled by option byte) - External Clock Input (enabled by option byte) - PLL for multiplying the frequency by 4 or 8 (enabled by option byte) Reset Sequence Manager (RSM) System Integrity Management (SI) - Main supply Low voltage detection (LVD) with reset generation (enabled by option byte) - Auxiliary Voltage detector (AVD) with interrupt capability for monitoring the main supply (enabled by option byte) RCCR0 RCCR1 VDD=5V TA=25C fRC=1MHz VDD=3.0V TA=25C fRC=700KHz 1000h and FFDEh 1001h andFFDFh FFDEh FFDFh s s 7.1 INTERNAL RC OSCILLATOR ADJUSTMENT The ST7LITE0 and ST7SUPERLITE contain an internal RC oscillator with an accuracy of 1% for a given device, temperature and voltage. It must be calibrated to obtain the frequency required in the application. This is done by software writing a calibration value in the RCCR (RC Control Register). Whenever the microcontroller is reset, the RCCR returns to its default value (FFh), i.e. each time the device is reset, the calibration value must be loaded in the RCCR. Predefined calibration values are stored in EEPROM for 3.0 and 5V VDD supply voltages at 25C, as shown in the following table. Notes: - See "ELECTRICAL CHARACTERISTICS" on page 78. for more information on the frequency and accuracy of the RC oscillator. - To improve clock stability, it is recommended to place a decoupling capacitor between the V DD and VSS pins as close as possible to the ST7 device. - These two bytes are systematically programmed by ST, including on FASTROM devices. Consequently, customers intending to use FASTROM service must not use these two bytes. Caution: If the voltage or temperature conditions change in the application, the frequency may need to be recalibrated. Refer to application note AN1324 for information on how to calibrate the RC frequency using an external reference signal. 7.2 PHASE LOCKED LOOP The PLL can be used to multiply a 1MHz frequency from the RC oscillator or the external clock by 4 or 8 to obtain fOSC of 4 or 8 MHz. The PLL is enabled and the multiplication factor of 4 or 8 is selected by 2 option bits. - The x4 PLL is intended for operation with VDD in the 2.4V to 3.3V range - The x8 PLL is intended for operation with VDD in the 3.3V to 5.5V range Refer to Section 15.1 for the option byte description. If the PLL is disabled and the RC oscillator is enabled, then fOSC = 1MHz. If both the RC oscillator and the PLL are disabled, fOSC is driven by the external clock. 23/122 1 ST7LITE0, ST7SUPERLITE Figure 12. PLL Output Frequency Timing Diagram LOCKED bit set 4/8 x input freq. tSTAB Output freq. tLOCK tSTARTUP Bit 0 = SMS Slow Mode select This bit is read/write by software and cleared by hardware after a reset. This bit selects the input clock fOSC or fOSC/32. 0: Normal mode (fCPU = fOSC 1: Slow mode (fCPU = fOSC/32) Bit 1 = MCO Main Clock Out enable This bit is read/write by software and cleared by hardware after a reset. This bit allows to enable the MCO output clock. 0: MCO clock disabled, I/O port free for general purpose I/O. 1: MCO clock enabled. t When the PLL is started, after reset or wakeup from Halt mode or AWUFH mode, it outputs the clock after a delay of tSTARTUP. When the PLL output signal reaches the operating frequency, the LOCKED bit in the SICSCR register is set. Full PLL accuracy (ACC PLL) is reached after a stabilization time of tSTAB (see Figure 12 and 13.3.4 Internal RC Oscillator and PLL) Refer to section 7.5.4 on page 32 for a description of the LOCKED bit in the SICSR register. 7.3 REGISTER DESCRIPTION MAIN CLOCK CONTROL/STATUS REGISTER (MCCSR) Read / Write Reset Value: 0000 0000 (00h) 7 00 0 0 0 0 0 MCO RC CONTROL REGISTER (RCCR) Read / Write Reset Value: 1111 1111 (FFh) 7 0 CR70 CR60 CR50 CR40 CR30 CR20 CR10 CR0 Bits 7:0 = CR[7:0] RC Oscillator Frequency Adjustment Bits These bits must be written immediately after reset to adjust the RC oscillator frequency and to obtain an accuracy of 1%. The application can store the correct value for each voltage range in EEPROM and write it to this register at start-up. 00h = maximum available frequency FFh = lowest available frequency Note: To tune the oscillator, write a series of different values in the register until the correct frequency is reached. The fastest method is to use a dichotomy starting with 80h. 0 SMS Bits 7:2 = Reserved, must be kept cleared. Table 5. Clock Register Map and Reset Values Address (Hex.) 0038h 0039h Register Label MCCSR Reset Value RCCR Reset Value 0 CR70 1 0 CR60 1 0 CR50 1 0 CR40 1 0 CR30 1 0 CR20 1 7 6 5 4 3 2 1 MCO 0 CR10 1 0 SMS 0 CR0 1 24/122 1 ST7LITE0, ST7SUPERLITE Figure 13. Clock Management Block Diagram CR7 CR6 CR5 CR4 CR3 CR2 CR1 CR0 RCCR 1MHz 8MHz Tunable 1% RC Oscillator PLL 1MHz -> 8MHz PLL 1MHz -> 4MHz Option byte fOSC 4MHz 0 to 8 MHz CLKIN /2 DIVIDER Option byte 8-BIT LITE TIMER COUNTER fOSC fOSC/32 1 fLTIMER (1ms timebase @ 8 MHz fOSC) /32 DIVIDER fCPU fOSC 0 TO CPU AND PERIPHERALS (except LITE TIMER) MCO SMS MCCSR 7 0 fCPU MCO 25/122 1 ST7LITE0, ST7SUPERLITE 7.4 RESET SEQUENCE MANAGER (RSM) 7.4.1 Introduction The reset sequence manager includes three RESET sources as shown in Figure 15: s External RESET source pulse s Internal LVD RESET (Low Voltage Detection) s Internal WATCHDOG RESET These sources act on the RESET pin and it is always kept low during the delay phase. The RESET service routine vector is fixed at addresses FFFEh-FFFFh in the ST7 memory map. The basic RESET sequence consists of 3 phases as shown in Figure 14: s Active Phase depending on the RESET source s 256 CPU clock cycle delay s RESET vector fetch The 256 CPU clock cycle delay allows the oscillator to stabilise and ensures that recovery has taken place from the Reset state. Figure 15. Reset Block Diagram The RESET vector fetch phase duration is 2 clock cycles. If the PLL is enabled by option byte, it outputs the clock after an additional delay of tSTARTUP (see Figure 12). Figure 14. RESET Sequence Phases RESET Active Phase INTERNAL RESET 256 CLOCK CYCLES FETCH VECTOR VDD RON RESET FILTER INTERNAL RESET PULSE GENERATOR WATCHDOG RESET LVD RESET 26/122 1 ST7LITE0, ST7SUPERLITE RESET SEQUENCE MANAGER (Cont'd) 7.4.2 Asynchronous External RESET pin The RESET pin is both an input and an open-drain output with integrated RON weak pull-up resistor. This pull-up has no fixed value but varies in accordance with the input voltage. It can be pulled low by external circuitry to reset the device. See Electrical Characteristic section for more details. A RESET signal originating from an external source must have a duration of at least t h(RSTL)in in order to be recognized (see Figure 16). This detection is asynchronous and therefore the MCU can enter reset state even in HALT mode. The RESET pin is an asynchronous signal which plays a major role in EMS performance. In a noisy environment, it is recommended to follow the guidelines mentioned in the electrical characteristics section. 7.4.3 External Power-On RESET If the LVD is disabled by option byte, to start up the microcontroller correctly, the user must ensure by means of an external reset circuit that the reset signal is held low until VDD is over the minimum level specified for the selected fOSC frequency. Figure 16. RESET Sequences VDD VIT+(LVD) VIT-(LVD) A proper reset signal for a slow rising VDD supply can generally be provided by an external RC network connected to the RESET pin. 7.4.4 Internal Low Voltage Detector (LVD) RESET Two different RESET sequences caused by the internal LVD circuitry can be distinguished: s Power-On RESET s Voltage Drop RESET The device RESET pin acts as an output that is pulled low when VDD EXTERNAL RESET WATCHDOG RESET RUN ACTIVE PHASE RUN ACTIVE PHASE RUN ACTIVE PHASE RUN th(RSTL)in EXTERNAL RESET SOURCE tw(RSTL)out RESET PIN WATCHDOG RESET WATCHDOG UNDERFLOW INTERNAL RESET (256 TCPU) VECTOR FETCH 27/122 1 ST7LITE0, ST7SUPERLITE 7.5 SYSTEM INTEGRITY MANAGEMENT (SI) The System Integrity Management block contains the Low voltage Detector (LVD) and Auxiliary Voltage Detector (AVD) functions. It is managed by the SICSR register. 7.5.1 Low Voltage Detector (LVD) The Low Voltage Detector function (LVD) generates a static reset when the VDD supply voltage is below a VIT-(LVD) reference value. This means that it secures the power-up as well as the power-down keeping the ST7 in reset. The VIT-(LVD) reference value for a voltage drop is lower than the V IT+(LVD) reference value for poweron in order to avoid a parasitic reset when the MCU starts running and sinks current on the supply (hysteresis). The LVD Reset circuitry generates a reset when VDD is below: - VIT+(LVD)when VDD is rising - VIT-(LVD) when VDD is falling The LVD function is illustrated in Figure 17. The voltage threshold can be configured by option byte to be low, medium or high. See section 15.1 on page 109. Figure 17. Low Voltage Detector vs Reset VDD Provided the minimum VDD value (guaranteed for the oscillator frequency) is above VIT-(LVD), the MCU can only be in two modes: - under full software control - in static safe reset In these conditions, secure operation is always ensured for the application without the need for external reset hardware. During a Low Voltage Detector Reset, the RESET pin is held low, thus permitting the MCU to reset other devices. Notes: The LVD is an optional function which can be selected by option byte. See section 15.1 on page 109. It allows the device to be used without any external RESET circuitry. If the LVD is disabled, an external circuitry must be used to ensure a proper power-on reset. Caution: If an LVD reset occurs after a watchdog reset has occurred, the LVD will take priority and will clear the watchdog flag. Vhys VIT+(LVD) VIT-(LVD) RESET 28/122 1 ST7LITE0, ST7SUPERLITE Figure 18. Reset and Supply Management Block Diagram WATCHDOG TIMER (WDG) STATUS FLAG SYSTEM INTEGRITY MANAGEMENT RESET SEQUENCE RESET MANAGER (RSM) SICSR 0 7 0 0 0 LOC LVD AVD AVD KED RF F IE 0 AVD Interrupt Request LOW VOLTAGE VSS VDD DETECTOR (LVD) AUXILIARY VOLTAGE DETECTOR (AVD) 29/122 1 ST7LITE0, ST7SUPERLITE SYSTEM INTEGRITY MANAGEMENT (Cont'd) 7.5.2 Auxiliary Voltage Detector (AVD) The Voltage Detector function (AVD) is based on an analog comparison between a VIT-(AVD) and VIT+(AVD) reference value and the VDD main supply voltage (VAVD). The VIT-(AVD) reference value for falling voltage is lower than the V IT+(AVD) reference value for rising voltage in order to avoid parasitic detection (hysteresis). The output of the AVD comparator is directly readable by the application software through a real time status bit (AVDF) in the SICSR register. This bit is read only. Caution: The AVD functions only if the LVD is enabled through the option byte. Figure 19. Using the AVD to Monitor VDD VDD Early Warning Interrupt (Power has dropped, MCU not not yet in reset) Vhyst 7.5.2.1 Monitoring the VDD Main Supply The AVD voltage threshold value is relative to the selected LVD threshold configured by option byte (see section 15.1 on page 109). If the AVD interrupt is enabled, an interrupt is generated when the voltage crosses the VIT+(LVD) or VIT-(AVD) threshold (AVDF bit is set). In the case of a drop in voltage, the AVD interrupt acts as an early warning, allowing software to shut down safely before the LVD resets the microcontroller. See Figure 19. The interrupt on the rising edge is used to inform the application that the VDD warning state is over VIT+(AVD) VIT-(AVD) VIT+(LVD) VIT-(LVD) AVDF bit AVD INTERRUPT REQUEST IF AVDIE bit = 1 0 1 RESET 1 0 INTERRUPT Cleared by reset INTERRUPT Cleared by hardware LVD RESET 30/122 1 ST7LITE0, ST7SUPERLITE SYSTEM INTEGRITY MANAGEMENT (Cont'd) 7.5.3 Low Power Modes Mode WAIT HALT Description No effect on SI. AVD interrupts cause the device to exit from Wait mode. The CRSR register is frozen. The AVD remains active but the AVD interrupt cannot be used to exit from Halt mode. Interrupt Event AVD event Enable Event Control Flag Bit AVDF AVDIE Exit from Wait Yes Exit from Halt Yes set and the interrupt mask in the CC register is reset (RIM instruction). 7.5.3.1 Interrupts The AVD interrupt event generates an interrupt if the corresponding Enable Control Bit (AVDIE) is 31/122 1 ST7LITE0, ST7SUPERLITE SYSTEM INTEGRITY MANAGEMENT (Cont'd) 7.5.4 Register Description SYSTEM INTEGRITY (SI) CONTROL/STATUS REGISTER (SICSR) If the AVDIE bit is set, an interrupt request is genRead /Write erated when the AVDF bit changes value. Refer to Reset Value: 0000 0x00 (0xh) Figure 19 for additional details 0: VDD over AVD threshold 7 0 1: VDD under AVD threshold 0 0 0 0 LOCK ED LVDRF AVDF AVDIE Bit 7:4 = Reserved, must be kept cleared. Bit 3 = LOCKED PLL Locked Flag This bit is set and cleared by hardware. It is set automatically when the PLL reaches its operating frequency. 0: PLL not locked 1: PLL locked Bit 2 = LVDRF LVD reset flag This bit indicates that the last Reset was generated by the LVD block. It is set by hardware (LVD reset) and cleared by software (writing zero). See WDGRF flag description in Section 11.1 for more details. When the LVD is disabled by OPTION BYTE, the LVDRF bit value is undefined. Bit 1 = AVDF Voltage Detector flag This read-only bit is set and cleared by hardware. Bit 0 = AVDIE Voltage Detector interrupt enable This bit is set and cleared by software. It enables an interrupt to be generated when the AVDF flag changes (toggles). The pending interrupt information is automatically cleared when software enters the AVD interrupt routine. 0: AVD interrupt disabled 1: AVD interrupt enabled Application notes The LVDRF flag is not cleared when another RESET type occurs (external or watchdog), the LVDRF flag remains set to keep trace of the original failure. In this case, a watchdog reset can be detected by software while an external reset can not. Table 6. System Integrity Register Map and Reset Values Address (Hex.) 003Ah Register Label SICSR Reset Value 0 0 0 0 7 6 5 4 3 LOCKED 0 2 LVDRF x 1 AVDF 0 0 AVDIE 0 32/122 1 ST7LITE0, ST7SUPERLITE 8 INTERRUPTS The ST7 core may be interrupted by one of two different methods: maskable hardware interrupts as listed in the Interrupt Mapping Table and a nonmaskable software interrupt (TRAP). The Interrupt processing flowchart is shown in Figure 20. The maskable interrupts must be enabled by clearing the I bit in order to be serviced. However, disabled interrupts may be latched and processed when they are enabled (see external interrupts subsection). Note: After reset, all interrupts are disabled. When an interrupt has to be serviced: - Normal processing is suspended at the end of the current instruction execution. - The PC, X, A and CC registers are saved onto the stack. - The I bit of the CC register is set to prevent additional interrupts. - The PC is then loaded with the interrupt vector of the interrupt to service and the first instruction of the interrupt service routine is fetched (refer to the Interrupt Mapping Table for vector addresses). The interrupt service routine should finish with the IRET instruction which causes the contents of the saved registers to be recovered from the stack. Note: As a consequence of the IRET instruction, the I bit will be cleared and the main program will resume. Priority Management By default, a servicing interrupt cannot be interrupted because the I bit is set by hardware entering in interrupt routine. In the case when several interrupts are simultaneously pending, an hardware priority defines which one will be serviced first (see the Interrupt Mapping Table). Interrupts and Low Power Mode All interrupts allow the processor to leave the WAIT low power mode. Only external and specifically mentioned interrupts allow the processor to leave the HALT low power mode (refer to the "Exit from HALT" column in the Interrupt Mapping Table). 8.1 NON MASKABLE SOFTWARE INTERRUPT This interrupt is entered when the TRAP instruction is executed regardless of the state of the I bit. It will be serviced according to the flowchart on Figure 20. 8.2 EXTERNAL INTERRUPTS External interrupt vectors can be loaded into the PC register if the corresponding external interrupt occurred and if the I bit is cleared. These interrupts allow the processor to leave the Halt low power mode. The external interrupt polarity is selected through the miscellaneous register or interrupt register (if available). An external interrupt triggered on edge will be latched and the interrupt request automatically cleared upon entering the interrupt service routine. If several input pins, connected to the same interrupt vector, are configured as interrupts, their signals are logically NANDed before entering the edge/level detection block. Caution: The type of sensitivity defined in the Miscellaneous or Interrupt register (if available) applies to the ei source. In case of a NANDed source (as described on the I/O ports section), a low level on an I/O pin configured as input with interrupt, masks the interrupt request even in case of risingedge sensitivity. 8.3 PERIPHERAL INTERRUPTS Different peripheral interrupt flags in the status register are able to cause an interrupt when they are active if both: - The I bit of the CC register is cleared. - The corresponding enable bit is set in the control register. If any of these two conditions is false, the interrupt is latched and thus remains pending. Clearing an interrupt request is done by: - Writing "0" to the corresponding bit in the status register or - Access to the status register while the flag is set followed by a read or write of an associated register. Note: the clearing sequence resets the internal latch. A pending interrupt (i.e. waiting for being enabled) will therefore be lost if the clear sequence is executed. 33/122 1 ST7LITE0, ST7SUPERLITE INTERRUPTS (Cont'd) Figure 20. Interrupt Processing Flowchart FROM RESET I BIT SET? Y N N INTERRUPT PENDING? Y FETCH NEXT INSTRUCTION N IRET? Y STACK PC, X, A, CC SET I BIT LOAD PC FROM INTERRUPT VECTOR EXECUTE INSTRUCTION RESTORE PC, X, A, CC FROM STACK THIS CLEARS I BIT BY DEFAULT Table 7. Interrupt Mapping N Source Block RESET TRAP 0 1 2 3 4 5 6 7 8 9 10 11 12 13 SI AT TIMER LITE TIMER SPI ei0 ei1 ei2 ei3 Reset Software Interrupt Not used External Interrupt 0 External Interrupt 1 External Interrupt 2 External Interrupt 3 Not used Not used AVD interrupt AT TIMER Output Compare Interrupt AT TIMER Overflow Interrupt LITE TIMER Input Capture Interrupt LITE TIMER RTC Interrupt SPI Peripheral Interrupts Not used SICSR PWM0CSR ATCSR LTCSR LTCSR SPICSR Lowest Priority yes no yes no yes yes N/A yes Description Register Label Priority Order Highest Priority Exit from HALT yes no Address Vector FFFEh-FFFFh FFFCh-FFFDh FFFAh-FFFBh FFF8h-FFF9h FFF6h-FFF7h FFF4h-FFF5h FFF2h-FFF3h FFF0h-FFF1h FFEEh-FFEFh FFECh-FFEDh FFEAh-FFEBh FFE8h-FFE9h FFE6h-FFE7h FFE4h-FFE5h FFE2h-FFE3h FFE0h-FFE1h 34/122 1 ST7LITE0, ST7SUPERLITE INTERRUPTS (Cont'd) EXTERNAL INTERRUPT CONTROL REGISTER (EICR) Read /Write Reset Value: 0000 0000 (00h) 7 IS31 IS30 IS21 IS20 IS11 IS10 IS01 0 IS00 Bit 1:0 = IS0[1:0] ei0 sensitivity These bits define the interrupt sensitivity for ei0 (Port A0) according to Table 8. Note: These 8 bits can be written only when the I bit in the CC register is set. Table 8. Interrupt Sensitivity Bits ISx1 ISx0 External Interrupt Sensitivity Falling edge & low level Rising edge only Falling edge only Rising and falling edge Bit 7:6 = IS3[1:0] ei3 sensitivity These bits define the interrupt sensitivity for ei3 (Port B0) according to Table 8. Bit 5:4 = IS2[1:0] ei2 sensitivity These bits define the interrupt sensitivity for ei2 (Port B3) according to Table 8. Bit 3:2 = IS1[1:0] ei1 sensitivity These bits define the interrupt sensitivity for ei1 (Port A7) according to Table 8. 0 0 1 1 0 1 0 1 . 35/122 1 ST7LITE0, ST7SUPERLITE 9 POWER SAVING MODES 9.1 INTRODUCTION To give a large measure of flexibility to the application in terms of power consumption, four main power saving modes are implemented in the ST7 (see Figure 21): SLOW, WAIT (SLOW WAIT), ACTIVE HALT and HALT. After a RESET the normal operating mode is selected by default (RUN mode). This mode drives the device (CPU and embedded peripherals) by means of a master clock which is based on the main oscillator frequency (fOSC). From RUN mode, the different power saving modes may be selected by setting the relevant register bits or by calling the specific ST7 software instruction whose action depends on the oscillator status. Figure 21. Power Saving Mode Transitions High RUN fOSC/32 fOSC 9.2 SLOW MODE This mode has two targets: - To reduce power consumption by decreasing the internal clock in the device, - To adapt the internal clock frequency (fCPU) to the available supply voltage. SLOW mode is controlled by the SMS bit in the MCCSR register which enables or disables Slow mode. In this mode, the oscillator frequency is divided by 32. The CPU and peripherals are clocked at this lower frequency. Notes: SLOW-WAIT mode is activated when entering WAIT mode while the device is already in SLOW mode. SLOW mode has no effect on the Lite Timer which is already clocked at FOSC/32. Figure 22. SLOW Mode Clock Transition SLOW WAIT SLOW WAIT fCPU fOSC SMS ACTIVE HALT NORMAL RUN MODE REQUEST HALT Low POWER CONSUMPTION 36/122 1 ST7LITE0, ST7SUPERLITE POWER SAVING MODES (Cont'd) 9.3 WAIT MODE WAIT mode places the MCU in a low power consumption mode by stopping the CPU. This power saving mode is selected by calling the `WFI' instruction. All peripherals remain active. During WAIT mode, the I bit of the CC register is cleared, to enable all interrupts. All other registers and memory remain unchanged. The MCU remains in WAIT mode until an interrupt or RESET occurs, whereupon the Program Counter branches to the starting address of the interrupt or Reset service routine. The MCU will remain in WAIT mode until a Reset or an Interrupt occurs, causing it to wake up. Refer to Figure 23. Figure 23. WAIT Mode Flow-chart OSCILLATOR PERIPHERALS CPU I BIT ON ON OFF 0 WFI INSTRUCTION N RESET N INTERRUPT Y OSCILLATOR PERIPHERALS CPU I BIT ON OFF ON 0 Y 256 CPU CLOCK CYCLE DELAY OSCILLATOR PERIPHERALS CPU I BIT ON ON ON X 1) FETCH RESET VECTOR OR SERVICE INTERRUPT Note: 1. Before servicing an interrupt, the CC register is pushed on the stack. The I bit of the CC register is set during the interrupt routine and cleared when the CC register is popped. 37/122 1 ST7LITE0, ST7SUPERLITE POWER SAVING MODES (Cont'd) 9.4 ACTIVE-HALT AND HALT MODES ACTIVE-HALT and HALT modes are the two lowest power consumption modes of the MCU. They are both entered by executing the `HALT' instruction. The decision to enter either in ACTIVE-HALT or HALT mode is given by the LTCSR/ATCSR register status as shown in the following table:. ATCSR LTCSR ATCSR ATCSR OVFIE TBIE bit CK1 bit CK0 bit bit 0 0 0 1 x x 0 1 x 1 x x 1 x 0 0 x 1 x 1 ACTIVE-HALT mode enabled ACTIVE-HALT mode disabled HALT INSTRUCTION (Active Halt enabled) Meaning Figure 24. ACTIVE-HALT Timing Overview RUN ACTIVE HALT 256 CPU CYCLE DELAY 1) RUN HALT INSTRUCTION [Active Halt Enabled] RESET OR INTERRUPT FETCH VECTOR Figure 25. ACTIVE-HALT Mode Flow-chart OSCILLATOR ON PERIPHERALS 2) OFF CPU OFF 0 I BIT 9.4.1 ACTIVE-HALT MODE ACTIVE-HALT mode is the lowest power consumption mode of the MCU with a real time clock available. It is entered by executing the `HALT' instruction when active halt mode is enabled. The MCU can exit ACTIVE-HALT mode on reception of a Lite Timer / AT Timer interrupt or a RESET. - When exiting ACTIVE-HALT mode by means of a RESET, a 256 CPU cycle delay occurs. After the start up delay, the CPU resumes operation by fetching the reset vector which woke it up (see Figure 25). - When exiting ACTIVE-HALT mode by means of an interrupt, the CPU immediately resumes operation by servicing the interrupt vector which woke it up (see Figure 25). When entering ACTIVE-HALT mode, the I bit in the CC register is cleared to enable interrupts. Therefore, if an interrupt is pending, the MCU wakes up immediately. In ACTIVE-HALT mode, only the main oscillator and the selected timer counter (LT/AT) are running to keep a wake-up time base. All other peripherals are not clocked except those which get their clock supply from another clock generator (such as external or auxiliary oscillator). Caution: As soon as ACTIVE-HALT is enabled, executing a HALT instruction while the Watchdog is active does not generate a RESET if the WDGHALT bit is reset. This means that the device cannot spend more than a defined delay in this power saving mode. N RESET N INTERRUPT 3) Y OSCILLATOR ON PERIPHERALS 2) OFF CPU ON X 4) I BIT 256 CPU CLOCK CYCLE DELAY OSCILLATOR PERIPHERALS CPU I BITS ON ON ON X 4) Y FETCH RESET VECTOR OR SERVICE INTERRUPT Notes: 1. This delay occurs only if the MCU exits ACTIVEHALT mode by means of a RESET. 2. Peripherals clocked with an external clock source can still be active. 3. Only the Lite Timer RTC and AT Timer interrupts can exit the MCU from ACTIVE-HALT mode. 4. Before servicing an interrupt, the CC register is pushed on the stack. The I bit of the CC register is set during the interrupt routine and cleared when the CC register is popped. 38/122 1 ST7LITE0, ST7SUPERLITE POWER SAVING MODES (Cont'd) 9.4.2 HALT MODE The HALT mode is the lowest power consumption mode of the MCU. It is entered by executing the `HALT' instruction when active halt mode is disabled. The MCU can exit HALT mode on reception of either a specific interrupt (see Table 7, "Interrupt Mapping," on page 34) or a RESET. When exiting HALT mode by means of a RESET or an interrupt, the oscillator is immediately turned on and the 256 CPU cycle delay is used to stabilize the oscillator. After the start up delay, the CPU resumes operation by servicing the interrupt or by fetching the reset vector which woke it up (see Figure 27). When entering HALT mode, the I bit in the CC register is forced to 0 to enable interrupts. Therefore, if an interrupt is pending, the MCU wakes immediately. In HALT mode, the main oscillator is turned off causing all internal processing to be stopped, including the operation of the on-chip peripherals. All peripherals are not clocked except the ones which get their clock supply from another clock generator (such as an external or auxiliary oscillator). The compatibility of Watchdog operation with HALT mode is configured by the "WDGHALT" option bit of the option byte. The HALT instruction when executed while the Watchdog system is enabled, can generate a Watchdog RESET (see section 15.1 on page 109 for more details). Figure 26. HALT Timing Overview RUN HALT 256 CPU CYCLE DELAY RESET OR INTERRUPT FETCH VECTOR RUN Figure 27. HALT Mode Flow-chart HALT INSTRUCTION (Active Halt disabled) ENABLE WDGHALT 1) 1 WATCHDOG RESET OSCILLATOR OFF PERIPHERALS 2) OFF CPU OFF I BIT 0 N RESET N Y INTERRUPT 3) Y OSCILLATOR PERIPHERALS CPU I BIT ON OFF ON X 4) 0 WATCHDOG DISABLE 256 CPU CLOCK CYCLE DELAY OSCILLATOR PERIPHERALS CPU I BITS ON ON ON X 4) FETCH RESET VECTOR OR SERVICE INTERRUPT HALT INSTRUCTION [Active Halt disabled] Notes: 1. WDGHALT is an option bit. See option byte section for more details. 2. Peripheral clocked with an external clock source can still be active. 3. Only some specific interrupts can exit the MCU from HALT mode (such as external interrupt). Refer to Table 7, "Interrupt Mapping," on page 34 for more details. 4. Before servicing an interrupt, the CC register is pushed on the stack. The I bit of the CC register is set during the interrupt routine and cleared when the CC register is popped. 5. If the PLL is enabled by option byte, it outputs the clock after a delay of tSTARTUP (see Figure 12). 39/122 1 ST7LITE0, ST7SUPERLITE POWER SAVING MODES (Cont'd) 9.4.2.1 HALT Mode Recommendations - Make sure that an external event is available to wake up the microcontroller from Halt mode. - When using an external interrupt to wake up the microcontroller, reinitialize the corresponding I/O as "Input Pull-up with Interrupt" before executing the HALT instruction. The main reason for this is that the I/O may be wrongly configured due to external interference or by an unforeseen logical condition. - For the same reason, reinitialize the level sensitiveness of each external interrupt as a precautionary measure. - The opcode for the HALT instruction is 0x8E. To avoid an unexpected HALT instruction due to a program counter failure, it is advised to clear all occurrences of the data value 0x8E from memory. For example, avoid defining a constant in ROM with the value 0x8E. - As the HALT instruction clears the I bit in the CC register to allow interrupts, the user may choose to clear all pending interrupt bits before executing the HALT instruction. This avoids entering other peripheral interrupt routines after executing the external interrupt routine corresponding to the wake-up event (reset or external interrupt). 40/122 1 ST7LITE0, ST7SUPERLITE 10 I/O PORTS 10.1 INTRODUCTION The I/O ports offer different functional modes: - transfer of data through digital inputs and outputs and for specific pins: - external interrupt generation - alternate signal input/output for the on-chip peripherals. An I/O port contains up to 8 pins. Each pin can be programmed independently as digital input (with or without interrupt generation) or digital output. 10.2 FUNCTIONAL DESCRIPTION Each port has 2 main registers: - Data Register (DR) - Data Direction Register (DDR) and one optional register: - Option Register (OR) Each I/O pin may be programmed using the corresponding register bits in the DDR and OR registers: bit X corresponding to pin X of the port. The same correspondence is used for the DR register. The following description takes into account the OR register, (for specific ports which do not provide this register refer to the I/O Port Implementation section). The generic I/O block diagram is shown in Figure 28 10.2.1 Input Modes The input configuration is selected by clearing the corresponding DDR register bit. In this case, reading the DR register returns the digital value applied to the external I/O pin. Different input modes can be selected by software through the OR register. Note: Writing the DR register modifies the latch value but does not affect the pin status. External interrupt function When an I/O is configured as Input with Interrupt, an event on this I/O can generate an external interrupt request to the CPU. Each pin can independently generate an interrupt request. The interrupt sensitivity is independently programmable using the sensitivity bits in the EICR register. Each external interrupt vector is linked to a dedicated group of I/O port pins (see pinout description and interrupt section). If several input pins are selected simultaneously as interrupt source, these are logically ANDed. For this reason if one of the interrupt pins is tied low, it masks the other ones. The external interrupts are hardware interrupts, which means that the request latch (not accessible directly by the application) is automatically cleared when the corresponding interrupt vector is fetched. To clear an unwanted pending interrupt by software, the sensitivity bits in the EICR register must be modified. 10.2.2 Output Modes The output configuration is selected by setting the corresponding DDR register bit. In this case, writing the DR register applies this digital value to the I/O pin through the latch. Then reading the DR register returns the previously stored value. Two different output modes can be selected by software through the OR register: Output push-pull and open-drain. DR register value and output pin status: DR 0 1 Push-pull VSS VDD Open-drain Vss Floating Note: When switching from input to output mode, the DR register has to be written first to drive the correct level on the pin as soon as the port is configured as an output. 10.2.3 Alternate Functions When an on-chip peripheral is configured to use a pin, the alternate function is automatically selected. This alternate function takes priority over the standard I/O programming under the following conditions: - When the signal is coming from an on-chip peripheral, the I/O pin is automatically configured in output mode (push-pull or open drain according to the peripheral). - When the signal is going to an on-chip peripheral, the I/O pin must be configured in floating input mode. In this case, the pin state is also digitally readable by addressing the DR register. Notes: - Input pull-up configuration can cause unexpected value at the input of the alternate peripheral input. - When an on-chip peripheral use a pin as input and output, this pin has to be configured in input floating mode. 41/122 1 ST7LITE0, ST7SUPERLITE I/O PORTS (Cont'd) Figure 28. I/O Port General Block Diagram REGISTER ACCESS ALTERNATE OUTPUT 1 VDD 0 ALTERNATE ENABLE DR P-BUFFER (see table below) PULL-UP (see table below) VDD DDR PULL-UP CONDITION If implemented OR SEL N-BUFFER DDR SEL CMOS SCHMITT TRIGGER ANALOG INPUT DIODES (see table below) PAD OR EXTERNAL INTERRUPT SOURCE (eix) Table 9. I/O Port Mode Options Configuration Mode Input Output Floating with/without Interrupt Pull-up with/without Interrupt Push-pull Open Drain (logic level) Pull-Up Off On Off P-Buffer Off On Off On On Diodes to VDD to VSS Legend: NI - not implemented Off - implemented not activated On - implemented and activated 42/122 DATA BUS DR SEL 1 0 ALTERNATE INPUT FROM OTHER BITS POLARITY SELECTION 1 ST7LITE0, ST7SUPERLITE I/O PORTS (Cont'd) Table 10. I/O Port Configurations Hardware Configuration VDD RPU PAD PULL-UP CONDITION DR REGISTER ACCESS DR REGISTER W DATA BUS R INPUT 1) ALTERNATE INPUT FROM OTHER PINS INTERRUPT CONDITION POLARITY SELECTION ANALOG INPUT EXTERNAL INTERRUPT SOURCE (eix) OPEN-DRAIN OUTPUT 2) VDD RPU PAD DR REGISTER ACCESS DR REGISTER R/W DATA BUS ALTERNATE ENABLE ALTERNATE OUTPUT PUSH-PULL OUTPUT 2) VDD RPU PAD DR REGISTER ACCESS DR REGISTER R/W DATA BUS ALTERNATE ENABLE ALTERNATE OUTPUT Notes: 1. When the I/O port is in input configuration and the associated alternate function is enabled as an output, reading the DR register will read the alternate function output status. 2. When the I/O port is in output configuration and the associated alternate function is enabled as an input, the alternate function reads the pin status given by the DR register content. 43/122 1 ST7LITE0, ST7SUPERLITE I/O PORTS (Cont'd) CAUTION: The alternate function must not be activated as long as the pin is configured as input with interrupt, in order to avoid generating spurious interrupts. Analog alternate function When the pin is used as an ADC input, the I/O must be configured as floating input. The analog multiplexer (controlled by the ADC registers) switches the analog voltage present on the selected pin to the common analog rail which is connected to the ADC input. It is recommended not to change the voltage level or loading on any port pin while conversion is in progress. Furthermore it is recommended not to have clocking pins located close to a selected analog pin. WARNING: The analog input voltage level must be within the limits stated in the absolute maximum ratings. 10.3 UNUSED I/O PINS Unused I/O pins must be connected to fixed voltage levels. Refer to Section 13.8. 10.4 LOW POWER MODES Mode WAIT HALT Description No effect on I/O ports. External interrupts cause the device to exit from WAIT mode. No effect on I/O ports. External interrupts cause the device to exit from HALT mode. 01 INPUT floating/pull-up interrupt 10.5 INTERRUPTS The external interrupt event generates an interrupt if the corresponding configuration is selected with DDR and OR registers and the interrupt mask in the CC register is not active (RIM instruction). Interrupt Event External interrupt on selected external event Enable Event Control Flag Bit DDRx ORx Exit from Wait Yes Exit from Halt Yes 10.6 I/O PORT IMPLEMENTATION The hardware implementation on each I/O port depends on the settings in the DDR and OR registers and specific feature of the I/O port such as ADC Input or true open drain. Switching these I/O ports from one state to another should be done in a sequence that prevents unwanted side effects. Recommended safe transitions are illustrated in Figure 29 Other transitions are potentially risky and should be avoided, since they are likely to present unwanted side-effects such as spurious interrupt generation. Figure 29. Interrupt I/O Port State Transitions 00 INPUT floating (reset state) 10 OUTPUT open-drain 11 OUTPUT push-pull XX = DDR, OR The I/O port register configurations are summarised as follows. Table 11. Port Configuration Port Pin name PA7 Port A PA6:1 PA0 PB4 Port B PB3 PB2:1 PB0 Input (DDR=0) OR = 0 OR = 1 floating floating floating floating floating floating floating pull-up interrupt pull-up pull-up interrupt pull-up pull-up interrupt pull-up pull-up interrupt Output (DDR=1) OR = 0 OR = 1 open drain open drain open drain open drain open drain open drain open drain push-pull push-pull push-pull push-pull push-pull push-pull push-pull 44/122 1 ST7LITE0, ST7SUPERLITE I/O PORTS (Cont'd) Table 12. I/O Port Register Map and Reset Values Address (Hex.) 0000h 0001h 0002h 0003h 0004h 0005h Register Label PADR Reset Value PADDR Reset Value PAOR Reset Value PBDR Reset Value PBDDR Reset Value PBOR Reset Value 7 MSB 0 MSB 0 MSB 0 MSB 1 MSB 0 MSB 0 6 5 4 3 2 1 0 LSB 0 LSB 0 LSB 0 LSB 0 LSB 0 LSB 0 0 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 45/122 1 ST7LITE0, ST7SUPERLITE 11 ON-CHIP PERIPHERALS 11.1 LITE TIMER (LT) 11.1.1 Introduction The Lite Timer can be used for general-purpose timing functions. It is based on a free-running 8-bit upcounter with two software-selectable timebase periods, an 8-bit input capture register and watchdog function. 11.1.2 Main Features s Realtime Clock - 8-bit upcounter - 1 ms or 2 ms timebase period (@ 8 MHz fOSC) - Maskable timebase interrupt s Input Capture - 8-bit input capture register (LTICR) - Maskable interrupt with wakeup from Halt Mode capability Figure 30. Lite Timer Block Diagram fLTIMER To 12-bit AT TImer s Watchdog - Enabled by hardware or software (configurable by option byte) - Optional reset on HALT instruction (configurable by option byte) - Automatically resets the device unless disable bit is refreshed - Software reset (Forced Watchdog reset) - Watchdog reset status flag fWDG fOSC/32 8-bit UPCOUNTER /2 fLTIMER 1 WATCHDOG WATCHDOG RESET Timebase 1 or 2 ms 0 (@ 8MHz fOSC) LTICR 8 LTIC 8-bit INPUT CAPTURE REGISTER LTCSR ICIE 7 ICF TB TBIE TBF WDG RF WDGE WDGD 0 LTTB INTERRUPT REQUEST LTIC INTERRUPT REQUEST 46/122 1 ST7LITE0, ST7SUPERLITE LITE TIMER (Cont'd) 11.1.3 Functional Description The value of the 8-bit counter cannot be read or written by software. After an MCU reset, it starts incrementing from 0 at a frequency of fOSC/32. A counter overflow event occurs when the counter rolls over from F9h to 00h. If fOSC = 8 MHz, then the time period between two counter overflow events is 1 ms. This period can be doubled by setting the TB bit in the LTCSR register. When the timer overflows, the TBF bit is set by hardware and an interrupt request is generated if the TBIE is set. The TBF bit is cleared by software reading the LTCSR register. 11.1.3.1 Watchdog The watchdog is enabled using the WDGE bit. The normal Watchdog timeout is 2ms (@ = 8 MHz fOSC), after which it then generates a reset. To prevent this watchdog reset occuring, software must set the WDGD bit. The WDGD bit is cleared by hardware after tWDG . This means that software must write to the WDGD bit at regular intervals to prevent a watchdog reset occurring. Refer to Figure 31. If the watchdog is not enabled immediately after reset, the first watchdog timeout will be shorter than 2ms, because this period is counted starting from reset. Moreover, if a 2ms period has already elapsed after the last MCU reset, the watchdog reset will take place as soon as the WDGE bit is set. For these reasons, it is recommended to enable the Watchdog immediately after reset or else to set the WDGD bit before the WGDE bit so a watchdog reset will not occur for at least 2ms. Note: Software can use the timebase feature to set the WDGD bit at 1 or 2 ms intervals. A Watchdog reset can be forced at any time by setting the WDGRF bit. To generate a forced watchdog reset, first watchdog has to be activated by setting the WDGE bit and then the WDGRF bit has to be set. The WDGRF bit also acts as a flag, indicating that the Watchdog was the source of the reset. It is automatically cleared after it has been read. Caution: When the WDGRF bit is set, software must clear it, otherwise the next time the watchdog is enabled (by hardware or software), the microcontroller will be immediately reset. Hardware Watchdog Option If Hardware Watchdog is selected by option byte, the watchdog is always active and the WDGE bit in the LTCSR is not used. Refer to the Option Byte description in the "device configuration and ordering information" section. Using Halt Mode with the Watchdog (option) If the Watchdog reset on HALT option is not selected by option byte, the Halt mode can be used when the watchdog is enabled. In this case, the HALT instruction stops the oscillator. When the oscillator is stopped, the Lite Timer stops counting and is no longer able to generate a Watchdog reset until the microcontroller receives an external interrupt or a reset. If an external interrupt is received, the WDG restarts counting after 256 CPU clocks. If a reset is generated, the Watchdog is disabled (reset state). If Halt mode with Watchdog is enabled by option byte (No watchdog reset on HALT instruction), it is recommended before executing the HALT instruction to refresh the WDG counter, to avoid an unexpected WDG reset immediately after waking up the microcontroller. 47/122 1 ST7LITE0, ST7SUPERLITE Figure 31. Watchdog Timing Diagram HARDWARE CLEARS WDGD BIT fWDG WDGD BIT INTERNAL WATCHDOG RESET tWDG (2ms @ 8MHz fOSC) SOFTWARE SETS WDGD BIT WATCHDOG RESET 48/122 1 ST7LITE0, ST7SUPERLITE LITE TIMER (Cont'd) Input Capture The 8-bit input capture register is used to latch the free-running upcounter after a rising or falling edge is detected on the ICAP1 pin. When an input capture occurs, the ICF bit is set and the LTICR register contains the MSB of the free-running upcounter. An interrupt is generated if the ICIE bit is set. The ICF bit is cleared by reading the LTICR register. The LTICR is a read only register and always contains the data from the last input capture. Input capture is inhibited if the ICF bit is set. 11.1.4 Low Power Modes Mode SLOW WAIT Description No effect on Lite timer (this peripheral is driven directly by f OSC/32) No effect on Lite timer ACTIVE-HALT No effect on Lite timer HALT Lite timer stops counting 11.1.5 Interrupts Interrupt Event Timebase Event IC Event Event Flag TBF ICF Enable Control Bit TBIE ICIE Exit from Wait Yes Yes Exit from Halt No No Exit from ActiveHalt Yes No Note: The TBF and ICF interrupt events are connected to separate interrupt vectors (see Interrupts chapter). They generate an interrupt if the enable bit is set in the LTCSR register and the interrupt mask in the CC register is reset (RIM instruction). Figure 32. Input Capture Timing Diagram. 4s (@ 8MHz fOSC) fCPU f OSC/32 CLEARED BY S/W READING LTIC REGISTER 8-bit COUNTER 01h 02h 03h 04h 05h 06h 07h LTIC PIN ICF FLAG LTICR REGISTER xxh 04h 07h t 49/122 1 ST7LITE0, ST7SUPERLITE LITE TIMER (Cont'd) 11.1.6 Register Description LITE TIMER CONTROL/STATUS REGISTER (LTCSR) Read / Write Reset Value: 0x00 0000 (x0h) 7 ICIE ICF TB TBIE TBF 0 WDGR WDGE WDGD 0: No counter overflow 1: A counter overflow has occurred Bit 2 = WDGRF Force Reset/ Reset Status Flag This bit is used in two ways: it is set by software to force a watchdog reset. It is set by hardware when a watchdog reset occurs and cleared by hardware or by software. It is cleared by hardware only when an LVD reset occurs. It can be cleared by software after a read access to the LTCSR register. 0: No watchdog reset occurred. 1: Force a watchdog reset (write), or, a watchdog reset occurred (read). Bit 1 = WDGE Watchdog Enable This bit is set and cleared by software. 0: Watchdog disabled 1: Watchdog enabled Bit 0 = WDGD Watchdog Reset Delay This bit is set by software. It is cleared by hardware at the end of each tWDG period. 0: Watchdog reset not delayed 1: Watchdog reset delayed LITE TIMER INPUT CAPTURE REGISTER (LTICR) Read only Reset Value: 0000 0000 (00h) 7 ICR7 ICR6 ICR5 ICR4 ICR3 ICR2 ICR1 0 ICR0 Bit 7 = ICIE Interrupt Enable. This bit is set and cleared by software. 0: Input Capture (IC) interrupt disabled 1: Input Capture (IC) interrupt enabled Bit 6 = ICF Input Capture Flag. This bit is set by hardware and cleared by software by reading the LTICR register. Writing to this bit does not change the bit value. 0: No input capture 1: An input capture has occurred Note: After an MCU reset, software must initialise the ICF bit by reading the LTICR register Bit 5 = TB Timebase period selection. This bit is set and cleared by software. 0: Timebase period = tOSC * 8000 (1ms @ 8 MHz) 1: Timebase period = tOSC * 16000 (2ms @ 8 MHz) Bit 4 = TBIE Timebase Interrupt enable. This bit is set and cleared by software. 0: Timebase (TB) interrupt disabled 1: Timebase (TB) interrupt enabled Bit 3 = TBF Timebase Interrupt Flag. This bit is set by hardware and cleared by software reading the LTCSR register. Writing to this bit has no effect. Bit 7:0 = ICR[7:0] Input Capture Value These bits are read by software and cleared by hardware after a reset. If the ICF bit in the LTCSR is cleared, the value of the 8-bit up-counter will be captured when a rising or falling edge occurs on the LTIC pin. Table 13. Lite Timer Register Map and Reset Values Address (Hex.) 0B 0C Register Label LTCSR Reset Value LTICR Reset Value 7 ICIE 0 ICR7 0 6 ICF x ICR6 0 5 TB 0 ICR5 0 4 TBIE 0 ICR4 0 3 TBF 0 ICR3 0 2 WDGRF 0 ICR2 0 1 WDGE 0 ICR1 0 0 WDGD 0 ICR0 0 50/122 1 ST7LITE0, ST7SUPERLITE 11.2 12-BIT AUTORELOAD TIMER (AT) 11.2.1 Introduction The 12-bit Autoreload Timer can be used for general-purpose timing functions. It is based on a freerunning 12-bit upcounter with a PWM output channel. 11.2.2 Main Features s 12-bit upcounter with 12-bit autoreload register (ATR) s Maskable overflow interrupt Figure 33. Block Diagram 7 ATCSR 0 0 0 CK1 CK0 0 OVF OVFIE CMPIE OVF INTERRUPT REQUEST s s s PWM signal generator Frequency range 2KHz-4MHz (@ 8 MHz fCPU) - Programmable duty-cycle - Polarity control - Maskable Compare interrupt Output Compare Function fLTIMER (1 ms timebase @ 8MHz) fCPU CMPF0 fCOUNTER CNTR 12-BIT UPCOUNTER CMP INTERRUPT REQUEST Update on OVF Event 12-BIT AUTORELOAD VALUE ATR OE0 bit PWM GENERATION OE0 bit CMPF0 bit 0 COMPPARE OP0 bit fPWM POLARITY OUTPUT CONTROL DCR0H DCR0L Preload Preload on OVF Event IF OE0=1 PWM0 1 12-BIT DUTY CYCLE VALUE (shadow) 51/122 1 ST7LITE0, ST7SUPERLITE 12-BIT AUTORELOAD TIMER (Cont'd) 11.2.3 Functional Description PWM Mode This mode allows a Pulse Width Modulated signals to be generated on the PWM0 output pin with minimum core processing overhead. The PWM0 output signal can be enabled or disabled using the OE0 bit in the PWMCR register. When this bit is set the PWM I/O pin is configured as output pushpull alternate function. Note: CMPF0 is available in PWM mode (see PWM0CSR description on page 55). PWM Frequency and Duty Cycle The PWM signal frequency (fPWM) is controlled by the counter period and the ATR register value. fPWM = fCOUNTER / (4096 - ATR) Following the above formula, if f CPU is 8 MHz, the maximum value of fPWM is 4 Mhz (ATR register value = 4094), and the minimum value is 2 kHz (ATR register value = 0). Note: The maximum value of ATR is 4094 because it must be lower than the DCR value which must be 4095 in this case. At reset, the counter starts counting from 0. Software must write the duty cycle value in the DCR0H and DCR0L preload registers. The DCR0H register must be written first. See caution below. When a upcounter overflow occurs (OVF event), the ATR value is loaded in the upcounter, the preloaded Duty cycle value is transferred to the Duty Cycle register and the PWM0 signal is set to a high level. When the upcounter matches the DCRx value the PWM0 signals is set to a low level. To obtain a signal on the PWM0 pin, the contents of the DCR0 register must be greater than the contents of the ATR register. The polarity bit can be used to invert the output signal. The maximum available resolution for the PWM0 duty cycle is: Resolution = 1 / (4096 - ATR) Note: To get the maximum resolution (1/4096), the ATR register must be 0. With this maximum resolution and assuming that DCR=ATR, a 0% or 100% duty cycle can be obtained by changing the polarity . Caution: As soon as the DCR0H is written, the compare function is disabled and will start only when the DCR0L value is written. If the DCR0H write occurs just before the compare event, the signal on the PWM output may not be set to a low level. In this case, the DCRx register should be updated just after an OVF event. If the DCR and ATR values are close, then the DCRx register shouldbe updated just before an OVF event, in order not to miss a compare event and to have the right signal applied on the PWM output. Figure 34. PWM Function 4095 DUTY CYCLE REGISTER (DCR0) COUNTER AUTO-RELOAD REGISTER (ATR) 000 t PWM0 OUTPUT WITH OE0=1 AND OP0=0 WITH OE0=1 AND OP0=1 52/122 1 ST7LITE0, ST7SUPERLITE 12-BIT AUTORELOAD TIMER (Cont'd) Figure 35. PWM Signal Example fCOUNTER ATR= FFDh PWM0 OUTPUT WITH OE0=1 AND OP0=0 COUNTER FFDh FFEh FFFh FFDh FFEh FFFh FFDh FFEh DCR0=FFEh t Output Compare Mode To use this function, the OE bit must be 0, otherwise the compare is done with the shadow register instead of the DCRx register. Software must then write a 12-bit value in the DCR0H and DCR0L registers. This value will be loaded immediately (without waiting for an OVF event). The DCR0H must be written first, the output compare function starts only when the DCR0L value is written. When the 12-bit upcounter (CNTR) reaches the value stored in the DCR0H and DCR0L registers, the CMPF0 bit in the PWM0CSR register is set and an interrupt request is generated if the CMPIE bit is set. Note: The output compare function is only available for DCRx values other than 0 (reset value). Caution: At each OVF event, the DCRx value is written in a shadow register, even if the DCR0L value has not yet been written (in this case, the shadow register will contain the new DCR0H value and the old DCR0L value), then: - If OE=1 (PWM mode): the compare is done between the timer counter and the shadow register (and not DCRx) - if OE=0 (OCMP mode): the compare is done between the timer counter and DCRx. There is no PWM signal. The compare between DCRx or the shadow register and the timer counter is locked until DCR0L is written. 11.2.4 Low Power Modes Description The input frequency is divided SLOW by 32 WAIT No effect on AT timer AT timer halted except if CK0=1, ACTIVE-HALT CK1=0 and OVFIE=1 HALT AT timer halted 11.2.5 Interrupts Interrupt Event 1) Overflow Event CMP Event Enable Exit Exit Event Control from from Flag Bit Wait Halt OVF OVFIE Yes Yes No No Exit from ActiveHalt Yes2) No Mode CMPFx CMPIE Note 1: The interrupt events are connected to separate interrupt vectors (see Interrupts chapter). They generate an interrupt if the enable bit is set in the ATCSR register and the interrupt mask in the CC register is reset (RIM instruction). Note 2: only if CK0=1and CK1=0 53/122 1 ST7LITE0, ST7SUPERLITE 12-BIT AUTORELOAD TIMER (Cont'd) 11.2.6 Register Description TIMER CONTROL STATUS REGISTER (ATCSR) Read / Write Reset Value: 0000 0000 (00h) 7 0 0 0 CK1 CK0 OVF 0 OVFIE CMPIE 0: OVF interrupt disabled 1: OVF interrupt enabled Bit 0 = CMPIE Compare Interrupt Enable. This bit is read/write by software and clear by hardware after a reset. It allows to mask the interrupt generation when CMPF bit is set. 0: CMPF interrupt disabled 1: CMPF interrupt enabled Bit 7:5 = Reserved, must be kept cleared. Bit 4:3 = CK[1:0] Counter Clock Selection. These bits are set and cleared by software and cleared by hardware after a reset. They select the clock frequency of the counter. The change becomes effective after an overflow. Counter Clock Selection OFF fLTIMER (1 ms timebase @ 8 MHz) fCPU Reserved CK1 0 0 1 1 CK0 0 1 0 1 COUNTER REGISTER HIGH (CNTRH) Read only Reset Value: 0000 0000 (00h) 15 0 0 0 0 CN11 CN10 CN9 8 CN8 COUNTER REGISTER LOW (CNTRL) Read only Reset Value: 0000 0000 (00h) 7 CN7 CN6 CN5 CN4 CN3 CN2 CN1 0 CN0 Bit 2 = OVF Overflow Flag. This bit is set by hardware and cleared by software by reading the ATCSR register. It indicates the transition of the counter from FFh to ATR value. 0: No counter overflow occurred 1: Counter overflow occurred Caution: When set, the OVF bit stays high for 1 f COUNTER cycle, (up to 1ms depending on the clock selection). Bits 15:12 = Reserved, must be kept cleared. Bits 11:0 = CNTR[11:0] Counter Value. This 12-bit register is read by software and cleared by hardware after a reset. The counter is incremented continuously as soon as a counter clock is selected. To obtain the 12-bit value, software should read the counter value in two consecutive read operations, LSB first. When a counter overflow occurs, the counter restarts from the value specified in the ATR register. Bit 1 = OVFIE Overflow Interrupt Enable. This bit is read/write by software and cleared by hardware after a reset. 54/122 1 ST7LITE0, ST7SUPERLITE 12-BIT AUTORELOAD TIMER (Cont'd) AUTO RELOAD REGISTER (ATRH) Read / Write Reset Value: 0000 0000 (00h) 15 0 0 0 0 ATR11 ATR10 ATR9 8 ATR8 PWM0 DUTY CYCLE REGISTER LOW (DCR0L) Read / Write Reset Value: 0000 0000 (00h) 7 DCR7 DCR6 DCR5 DCR4 DCR3 DCR2 0 DCR1 DCR0 AUTO RELOAD REGISTER (ATRL) Read / Write Reset Value: 0000 0000 (00h) 7 ATR7 ATR6 ATR5 ATR4 ATR3 ATR2 ATR1 0 ATR0 Bits 15:12 = Reserved, must be kept cleared. Bits 11:0 = DCR[11:0] PWMx Duty Cycle Value This 12-bit value is written by software. The high register must be written first. In PWM mode (OE0=1 in the PWMCR register) the DCR[11:0] bits define the duty cycle of the PWM0 output signal (see Figure 34). In Output Compare mode, (OE0=0 in the PWMCR register) they define the value to be compared with the 12bit upcounter value. Bits 15:12 = Reserved, must be kept cleared. Bits 11:0 = ATR[11:0] Autoreload Register. This is a 12-bit register which is written by software. The ATR register value is automatically loaded into the upcounter when an overflow occurs. The register value is used to set the PWM frequency. PWM0 DUTY CYCLE REGISTER HIGH (DCR0H) Read / Write Reset Value: 0000 0000 (00h) 15 0 0 0 0 DCR11 DCR10 DCR9 8 PWM0 CONTROL/STATUS (PWM0CSR) Read / Write Reset Value: 0000 0000 (00h) 7 0 0 0 0 0 0 REGISTER 0 OP0 CMPF0 Bit 7:2= Reserved, must be kept cleared. DCR8 Bit 1 = OP0 PWM0 Output Polarity. This bit is read/write by software and cleared by hardware after a reset. This bit selects the polarity of the PWM0 signal. 0: The PWM0 signal is not inverted. 1: The PWM0 signal is inverted. Bit 0 = CMPF0 PWM0 Compare Flag. This bit is set by hardware and cleared by software by reading the PWM0CSR register. It indicates that the upcounter value matches the DCR0 register value. 0: Upcounter value does not match DCR value. 1: Upcounter value matches DCR value. 55/122 1 ST7LITE0, ST7SUPERLITE 12-BIT AUTORELOAD TIMER (Cont'd) PWM OUTPUT CONTROL REGISTER (PWMCR) Read/Write Reset Value: 0000 0000 (00h) 7 0 0 0 0 0 0 0 Bits 7:1 = Reserved, must be kept cleared. Bit 0 = OE0 PWM0 Output enable. This bit is set and cleared by software. 0: PWM0 output Alternate Function disabled (I/O pin free for general purpose I/O) 1: PWM0 output enabled 0 OE0 Table 14. Register Map and Reset Values Address (Hex.) 0D 0E 0F 10 11 12 13 17 18 Register Label ATCSR Reset Value CNTRH Reset Value CNTRL Reset Value ATRH Reset Value ATRL Reset Value PWMCR Reset Value PWM0CSR Reset Value DCR0H Reset Value DCR0L Reset Value 7 6 5 4 CK1 0 0 CN6 0 0 ATR4 0 0 0 0 DCR4 0 3 CK0 0 CN11 0 CN3 0 ATR11 0 ATR3 0 0 0 DCR11 0 DCR3 0 2 OVF 0 CN10 0 CN2 0 ATR10 0 ATR2 0 0 0 DCR10 0 DCR2 0 1 OVFIE 0 CN9 0 CN1 0 ATR9 0 ATR1 0 0 OP 0 DCR9 0 DCR1 0 0 CMPIE 0 CN8 0 CN0 0 ATR8 0 ATR0 0 OE0 0 CMPF0 0 DCR8 0 DCR0 0 0 0 CN7 0 0 ATR7 0 0 0 0 DCR7 0 0 0 CN8 0 0 ATR6 0 0 0 0 DCR6 0 0 0 CN7 0 0 ATR5 0 0 0 0 DCR5 0 56/122 1 ST7LITE0, ST7SUPERLITE 11.3 SERIAL PERIPHERAL INTERFACE (SPI) 11.3.1 Introduction The Serial Peripheral Interface (SPI) allows fullduplex, synchronous, serial communication with external devices. An SPI system may consist of a master and one or more slaves however the SPI interface can not be a master in a multi-master system. 11.3.2 Main Features s Full duplex synchronous transfers (on 3 lines) s Simplex synchronous transfers (on 2 lines) s Master or slave operation s Six master mode frequencies (fCPU /4 max.) s fCPU/2 max. slave mode frequency s SS Management by software or hardware s Programmable clock polarity and phase s End of transfer interrupt flag s Write collision, Master Mode Fault and Overrun flags 11.3.3 General Description Figure 36 shows the serial peripheral interface (SPI) block diagram. There are 3 registers: - SPI Control Register (SPICR) - SPI Control/Status Register (SPICSR) - SPI Data Register (SPIDR) The SPI is connected to external devices through 3 pins: - MISO: Master In / Slave Out data - MOSI: Master Out / Slave In data - SCK: Serial Clock out by SPI masters and input by SPI slaves - SS: Slave select: This input signal acts as a `chip select' to let the SPI master communicate with slaves individually and to avoid contention on the data lines. Slave SS inputs can be driven by standard I/O ports on the master MCU. Figure 36. Serial Peripheral Interface Block Diagram Data/Address Bus SPIDR Read Read Buffer Interrupt request MOSI MISO 8-Bit Shift Register 7 SPIF WCOL OVR MODF 0 SPICSR SOD SSM 0 SSI SOD bit Write SS SPI STATE CONTROL 1 0 SCK 7 SPIE SPICR 0 SPE SPR2 MSTR CPOL CPHA SPR1 SPR0 MASTER CONTROL SERIAL CLOCK GENERATOR SS 57/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) 11.3.3.1 Functional Description A basic example of interconnections between a single master and a single slave is illustrated in Figure 37. The MOSI pins are connected together and the MISO pins are connected together. In this way data is transferred serially between master and slave (most significant bit first). The communication is always initiated by the master. When the master device transmits data to a slave device via MOSI pin, the slave device reFigure 37. Single Master/ Single Slave Application SLAVE LSBit MISO MISO MSBit LSBit sponds by sending data to the master device via the MISO pin. This implies full duplex communication with both data out and data in synchronized with the same clock signal (which is provided by the master device via the SCK pin). To use a single data line, the MISO and MOSI pins must be connected at each node ( in this case only simplex communication is possible). Four possible data/clock timing relationships may be chosen (see Figure 40) but master and slave must be programmed with the same timing mode. MASTER MSBit 8-BIT SHIFT REGISTER 8-BIT SHIFT REGISTER MOSI MOSI SPI CLOCK GENERATOR SCK SS +5V SCK SS Not used if SS is managed by software 58/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) 11.3.3.2 Slave Select Management As an alternative to using the SS pin to control the Slave Select signal, the application can choose to manage the Slave Select signal by software. This is configured by the SSM bit in the SPICSR register (see Figure 39) In software management, the external SS pin is free for other application uses and the internal SS signal level is driven by writing to the SSI bit in the SPICSR register. In Master mode: - SS internal must be held high continuously In Slave Mode: There are two cases depending on the data/clock timing relationship (see Figure 38): If CPHA=1 (data latched on 2nd clock edge): - SS internal must be held low during the entire transmission. This implies that in single slave applications the SS pin either can be tied to VSS, or made free for standard I/O by managing the SS function by software (SSM= 1 and SSI=0 in the in the SPICSR register) If CPHA=0 (data latched on 1st clock edge): - SS internal must be held low during byte transmission and pulled high between each byte to allow the slave to write to the shift register. If SS is not pulled high, a Write Collision error will occur when the slave writes to the shift register (see Section 11.3.5.3). Figure 38. Generic SS Timing Diagram MOSI/MISO Master SS Slave SS (if CPHA=0) Slave SS (if CPHA=1) Byte 1 Byte 2 Byte 3 Figure 39. Hardware/Software Slave Select Management SSM bit SSI bit SS external pin 1 0 SS internal 59/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) 11.3.3.3 Master Mode Operation In master mode, the serial clock is output on the SCK pin. The clock frequency, polarity and phase are configured by software (refer to the description of the SPICSR register). Note: The idle state of SCK must correspond to the polarity selected in the SPICSR register (by pulling up SCK if CPOL=1 or pulling down SCK if CPOL=0). To operate the SPI in master mode, perform the following two steps in order (if the SPICSR register is not written first, the SPICR register setting may be not taken into account): 1. Write to the SPICSR register: - Select the clock frequency by configuring the SPR[2:0] bits. - Select the clock polarity and clock phase by configuring the CPOL and CPHA bits. Figure 40 shows the four possible configurations. Note: The slave must have the same CPOL and CPHA settings as the master. - Either set the SSM bit and set the SSI bit or clear the SSM bit and tie the SS pin high for the complete byte transmit sequence. 2. Write to the SPICR register: - Set the MSTR and SPE bits Note: MSTR and SPE bits remain set only if SS is high). The transmit sequence begins when software writes a byte in the SPIDR register. 11.3.3.4 Master Mode Transmit Sequence When software writes to the SPIDR register, the data byte is loaded into the 8-bit shift register and then shifted out serially to the MOSI pin most significant bit first. When data transfer is complete: - The SPIF bit is set by hardware - An interrupt request is generated if the SPIE bit is set and the interrupt mask in the CCR register is cleared. Clearing the SPIF bit is performed by the following software sequence: 1. An access to the SPICSR register while the SPIF bit is set 2. A read to the SPIDR register. Note: While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR register is read. 11.3.3.5 Slave Mode Operation In slave mode, the serial clock is received on the SCK pin from the master device. To operate the SPI in slave mode: 1. Write to the SPICSR register to perform the following actions: - Select the clock polarity and clock phase by configuring the CPOL and CPHA bits (see Figure 40). Note: The slave must have the same CPOL and CPHA settings as the master. - Manage the SS pin as described in Section 11.3.3.2 and Figure 38. If CPHA=1 SS must be held low continuously. If CPHA=0 SS must be held low during byte transmission and pulled up between each byte to let the slave write in the shift register. 2. Write to the SPICR register to clear the MSTR bit and set the SPE bit to enable the SPI I/O functions. 11.3.3.6 Slave Mode Transmit Sequence When software writes to the SPIDR register, the data byte is loaded into the 8-bit shift register and then shifted out serially to the MISO pin most significant bit first. The transmit sequence begins when the slave device receives the clock signal and the most significant bit of the data on its MOSI pin. When data transfer is complete: - The SPIF bit is set by hardware - An interrupt request is generated if SPIE bit is set and interrupt mask in the CCR register is cleared. Clearing the SPIF bit is performed by the following software sequence: 1. An access to the SPICSR register while the SPIF bit is set. 2. A write or a read to the SPIDR register. Notes: While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR register is read. The SPIF bit can be cleared during a second transmission; however, it must be cleared before the second SPIF bit in order to prevent an Overrun condition (see Section 11.3.5.2). 60/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) 11.3.4 Clock Phase and Clock Polarity Four possible timing relationships may be chosen by software, using the CPOL and CPHA bits (See Figure 40). Note: The idle state of SCK must correspond to the polarity selected in the SPICSR register (by pulling up SCK if CPOL=1 or pulling down SCK if CPOL=0). The combination of the CPOL clock polarity and CPHA (clock phase) bits selects the data capture clock edge Figure 40. Data Clock Timing Diagram Figure 40, shows an SPI transfer with the four combinations of the CPHA and CPOL bits. The diagram may be interpreted as a master or slave timing diagram where the SCK pin, the MISO pin, the MOSI pin are directly connected between the master and the slave device. Note: If CPOL is changed at the communication byte boundaries, the SPI must be disabled by resetting the SPE bit. CPHA =1 SCK (CPOL = 1) SCK (CPOL = 0) MISO (from master) MOSI (from slave) SS (to slave) CAPTURE STROBE MSBit Bit 6 Bit 5 Bit 4 Bit3 Bit 2 Bit 1 LSBit MSBit Bit 6 Bit 5 Bit 4 Bit3 Bit 2 Bit 1 LSBit CPHA =0 SCK (CPOL = 1) SCK (CPOL = 0) MISO (from master) MOSI (from slave) SS (to slave) CAPTURE STROBE MSBit Bit 6 Bit 5 Bit 4 Bit3 Bit 2 Bit 1 LSBit MSBit Bit 6 Bit 5 Bit 4 Bit3 Bit 2 Bit 1 LSBit Note: This figure should not be used as a replacement for parametric information. Refer to the Electrical Characteristics chapter. 61/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) 11.3.5 Error Flags 11.3.5.1 Master Mode Fault (MODF) Master mode fault occurs when the master device has its SS pin pulled low. When a Master mode fault occurs: - The MODF bit is set and an SPI interrupt request is generated if the SPIE bit is set. - The SPE bit is reset. This blocks all output from the device and disables the SPI peripheral. - The MSTR bit is reset, thus forcing the device into slave mode. Clearing the MODF bit is done through a software sequence: 1. A read access to the SPICSR register while the MODF bit is set. 2. A write to the SPICR register. Notes: To avoid any conflicts in an application with multiple slaves, the SS pin must be pulled high during the MODF bit clearing sequence. The SPE and MSTR bits may be restored to their original state during or after this clearing sequence. Hardware does not allow the user to set the SPE and MSTR bits while the MODF bit is set except in the MODF bit clearing sequence. 11.3.5.2 Overrun Condition (OVR) An overrun condition occurs, when the master device has sent a data byte and the slave device has not cleared the SPIF bit issued from the previously transmitted byte. When an Overrun occurs: - The OVR bit is set and an interrupt request is generated if the SPIE bit is set. In this case, the receiver buffer contains the byte sent after the SPIF bit was last cleared. A read to the SPIDR register returns this byte. All other bytes are lost. The OVR bit is cleared by reading the SPICSR register. 11.3.5.3 Write Collision Error (WCOL) A write collision occurs when the software tries to write to the SPIDR register while a data transfer is taking place with an external device. When this happens, the transfer continues uninterrupted; and the software write will be unsuccessful. Write collisions can occur both in master and slave mode. See also Section 11.3.3.2 Slave Select Management. Note: a "read collision" will never occur since the received data byte is placed in a buffer in which access is always synchronous with the MCU operation. The WCOL bit in the SPICSR register is set if a write collision occurs. No SPI interrupt is generated when the WCOL bit is set (the WCOL bit is a status flag only). Clearing the WCOL bit is done through a software sequence (see Figure 41). Figure 41. Clearing the WCOL bit (Write Collision Flag) Software Sequence Clearing sequence after SPIF = 1 (end of a data byte transfer) 1st Step Read SPICSR RESULT 2nd Step Read SPIDR SPIF =0 WCOL=0 Clearing sequence before SPIF = 1 (during a data byte transfer) 1st Step 2nd Step Read SPICSR RESULT Read SPIDR WCOL=0 Note: Writing to the SPIDR register instead of reading it does not reset the WCOL bit 62/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) 11.3.5.4 Single Master Systems A typical single master system may be configured, using an MCU as the master and four MCUs as slaves (see Figure 42). The master device selects the individual slave devices by using four pins of a parallel port to control the four SS pins of the slave devices. The SS pins are pulled high during reset since the master device ports will be forced to be inputs at that time, thus disabling the slave devices. Note: To prevent a bus conflict on the MISO line the master allows only one active slave device during a transmission. For more security, the slave device may respond to the master with the received data byte. Then the master will receive the previous byte back from the slave device if all MISO and MOSI pins are connected and the slave has not written to its SPIDR register. Other transmission security methods can use ports for handshake lines or data bytes with command fields. Figure 42. Single Master / Multiple Slave Configuration SS SCK Slave MCU MOSI MISO SCK Slave MCU SS SCK Slave MCU SS SCK Slave MCU SS MOSI MISO MOSI MISO MOSI MISO MOSI MISO SCK Master MCU 5V SS Ports 63/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) 11.3.6 Low Power Modes Mode WAIT Description No effect on SPI. SPI interrupt events cause the device to exit from WAIT mode. SPI registers are frozen. In HALT mode, the SPI is inactive. SPI operation resumes when the MCU is woken up by an interrupt with "exit from HALT mode" capability. The data received is subsequently read from the SPIDR register when the software is running (interrupt vector fetching). If several data are received before the wakeup event, then an overrun error is generated. This error can be detected after the fetch of the interrupt routine that woke up the device. SPI exits from Slave mode, it returns to normal state immediately. Caution: The SPI can wake up the ST7 from Halt mode only if the Slave Select signal (external SS pin or the SSI bit in the SPICSR register) is low when the ST7 enters Halt mode. So if Slave selection is configured as external (see Section 11.3.3.2), make sure the master drives a low level on the SS pin when the slave enters Halt mode. 11.3.7 Interrupts Interrupt Event SPI End of Transfer Event Master Mode Fault Event Overrun Error Event Flag SPIF MODF OVR SPIE Enable Control Bit Exit from Wait Yes Yes Yes Exit from Halt Yes No No HALT 11.3.6.1 Using the SPI to wakeup the MCU from Halt mode In slave configuration, the SPI is able to wakeup the ST7 device from HALT mode through a SPIF interrupt. The data received is subsequently read from the SPIDR register when the software is running (interrupt vector fetch). If multiple data transfers have been performed before software clears the SPIF bit, then the OVR bit is set by hardware. Note: When waking up from Halt mode, if the SPI remains in Slave mode, it is recommended to perform an extra communications cycle to bring the SPI from Halt mode state to normal state. If the Note: The SPI interrupt events are connected to the same interrupt vector (see Interrupts chapter). They generate an interrupt if the corresponding Enable Control Bit is set and the interrupt mask in the CC register is reset (RIM instruction). 64/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) 11.3.8 Register Description CONTROL REGISTER (SPICR) Read/Write Reset Value: 0000 xxxx (0xh) 7 SPIE SPE SPR2 MSTR CPOL CPHA SPR1 0 SPR0 Bit 7 = SPIE Serial Peripheral Interrupt Enable. This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SPI interrupt is generated whenever SPIF=1, MODF=1 or OVR=1 in the SPICSR register Bit 6 = SPE Serial Peripheral Output Enable. This bit is set and cleared by software. It is also cleared by hardware when, in master mode, SS=0 (see Section 11.3.5.1 Master Mode Fault (MODF)). The SPE bit is cleared by reset, so the SPI peripheral is not initially connected to the external pins. 0: I/O pins free for general purpose I/O 1: SPI I/O pin alternate functions enabled Bit 5 = SPR2 Divider Enable. This bit is set and cleared by software and is cleared by reset. It is used with the SPR[1:0] bits to set the baud rate. Refer to Table 15 SPI Master mode SCK Frequency. 0: Divider by 2 enabled 1: Divider by 2 disabled Note: This bit has no effect in slave mode. Bit 4 = MSTR Master Mode. This bit is set and cleared by software. It is also cleared by hardware when, in master mode, SS=0 (see Section 11.3.5.1 Master Mode Fault (MODF)). 0: Slave mode 1: Master mode. The function of the SCK pin changes from an input to an output and the functions of the MISO and MOSI pins are reversed. Bit 3 = CPOL Clock Polarity. This bit is set and cleared by software. This bit determines the idle state of the serial Clock. The CPOL bit affects both the master and slave modes. 0: SCK pin has a low level idle state 1: SCK pin has a high level idle state Note: If CPOL is changed at the communication byte boundaries, the SPI must be disabled by resetting the SPE bit. Bit 2 = CPHA Clock Phase. This bit is set and cleared by software. 0: The first clock transition is the first data capture edge. 1: The second clock transition is the first capture edge. Note: The slave must have the same CPOL and CPHA settings as the master. Bits 1:0 = SPR[1:0] Serial Clock Frequency. These bits are set and cleared by software. Used with the SPR2 bit, they select the baud rate of the SPI serial clock SCK output by the SPI in master mode. Note: These 2 bits have no effect in slave mode. Table 15. SPI Master mode SCK Frequency Serial Clock fCPU/4 fCPU/8 fCPU/16 fCPU/32 fCPU/64 fCPU/128 SPR2 1 0 0 1 0 0 SPR1 0 0 0 1 1 1 SPR0 0 0 1 0 0 1 65/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) CONTROL/STATUS REGISTER (SPICSR) Read/Write (some bits Read Only) Reset Value: 0000 0000 (00h) 7 SPIF WCOL OVR MODF SOD SSM 0 SSI Bit 3 = Reserved, must be kept cleared. Bit 2 = SOD SPI Output Disable. This bit is set and cleared by software. When set, it disables the alternate function of the SPI output (MOSI in master mode / MISO in slave mode) 0: SPI output enabled (if SPE=1) 1: SPI output disabled Bit 1 = SSM SS Management. This bit is set and cleared by software. When set, it disables the alternate function of the SPI SS pin and uses the SSI bit value instead. See Section 11.3.3.2 Slave Select Management. 0: Hardware management (SS managed by external pin) 1: Software management (internal SS signal controlled by SSI bit. External SS pin free for general-purpose I/O) Bit 0 = SSI SS Internal Mode. This bit is set and cleared by software. It acts as a `chip select' by controlling the level of the SS slave select signal when the SSM bit is set. 0 : Slave selected 1 : Slave deselected DATA I/O REGISTER (SPIDR) Read/Write Reset Value: Undefined 7 0 D6 D5 D4 D3 D2 D1 D0 Bit 7 = SPIF Serial Peripheral Data Transfer Flag (Read only). This bit is set by hardware when a transfer has been completed. An interrupt is generated if SPIE=1 in the SPICR register. It is cleared by a software sequence (an access to the SPICSR register followed by a write or a read to the SPIDR register). 0: Data transfer is in progress or the flag has been cleared. 1: Data transfer between the device and an external device has been completed. Note: While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR register is read. Bit 6 = WCOL Write Collision status (Read only). This bit is set by hardware when a write to the SPIDR register is done during a transmit sequence. It is cleared by a software sequence (see Figure 41). 0: No write collision occurred 1: A write collision has been detected Bit 5 = OVR SPI Overrun error (Read only). This bit is set by hardware when the byte currently being received in the shift register is ready to be transferred into the SPIDR register while SPIF = 1 (See Section 11.3.5.2). An interrupt is generated if SPIE = 1 in SPICSR register. The OVR bit is cleared by software reading the SPICSR register. 0: No overrun error 1: Overrun error detected Bit 4 = MODF Mode Fault flag (Read only). This bit is set by hardware when the SS pin is pulled low in master mode (see Section 11.3.5.1 Master Mode Fault (MODF)). An SPI interrupt can be generated if SPIE=1 in the SPICSR register. This bit is cleared by a software sequence (An access to the SPICSR register while MODF=1 followed by a write to the SPICR register). 0: No master mode fault detected 1: A fault in master mode has been detected D7 The SPIDR register is used to transmit and receive data on the serial bus. In a master device, a write to this register will initiate transmission/reception of another byte. Notes: During the last clock cycle the SPIF bit is set, a copy of the received data byte in the shift register is moved to a buffer. When the user reads the serial peripheral data I/O register, the buffer is actually being read. While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR register is read. Warning: A write to the SPIDR register places data directly into the shift register for transmission. A read to the SPIDR register returns the value located in the buffer and not the content of the shift register (see Figure 36). 66/122 1 ST7LITE0, ST7SUPERLITE SERIAL PERIPHERAL INTERFACE (Cont'd) Table 16. SPI Register Map and Reset Values Address (Hex.) 31 32 33 Register Label SPIDR Reset Value SPICR Reset Value SPICSR Reset Value 7 MSB x SPIE 0 SPIF 0 6 5 4 3 2 1 0 LSB x SPR0 x SSI 0 x SPE 0 WCOL 0 x SPR2 0 OVR 0 x MSTR 0 MODF 0 x CPOL x 0 x CPHA x SOD 0 x SPR1 x SSM 0 67/122 1 ST7LITE0, ST7SUPERLITE 11.4 8-BIT A/D CONVERTER (ADC) 11.4.1 Introduction The on-chip Analog to Digital Converter (ADC) peripheral is a 8-bit, successive approximation converter with internal sample and hold circuitry. This peripheral has up to 5 multiplexed analog input channels (refer to device pin out description) that allow the peripheral to convert the analog voltage levels from up to 5 different sources. The result of the conversion is stored in a 8-bit Data Register. The A/D converter is controlled through a Control/Status Register. 11.4.2 Main Features s 8-bit conversion s Up to 5 channels with multiplexed input s Linear successive approximation s Dual input range - 0 to VDD or - 0V to 250mV s Data register (DR) which contains the results s Conversion complete status flag s On/off bit (to reduce consumption) s Fixed gain operational amplifier (x8) (not available on ST7LITES5 devices) 11.4.3 Functional Description 11.4.3.1 Analog Power Supply The block diagram is shown in Figure 43. VDD and VSS are the high and low level reference voltage pins. Conversion accuracy may therefore be impacted by voltage drops and noise in the event of heavily loaded or badly decoupled power supply lines. For more details, refer to the Electrical characteristics section. 11.4.3.2 Input Voltage Amplifier The input voltage can be amplified by a factor of 8 by enabling the AMPSEL bit in the ADAMP register. When the amplifier is enabled, the input range is 0V to 250 mV. For example, if VDD = 5V, then the ADC can convert voltages in the range 0V to 250mV with an ideal resolution of 2.4mV (equivalent to 11-bit resolution with reference to a VSS to VDD range). For more details, refer to the Electrical characteristics section. Note: The amplifier is switched on by the ADON bit in the ADCCSR register, so no additional startup time is required when the amplifier is selected by the AMPSEL bit. Figure 43. ADC Block Diagram fCPU DIV 2 DIV 4 0 0 1 7 EOC SPEED ADON 0 0 1 fADC SLOW (ADCAMP Register) bit 0 CH2 CH1 CH0 ADCCSR 3 AIN0 HOLD CONTROL AIN1 ANALOG MUX AINx x 1 or x8 RADC CADC ANALOG TO DIGITAL CONVERTER AMPSEL bit (ADCAMP Register) ADCDR D7 D6 D5 D4 D3 D2 D1 D0 68/122 1 ST7LITE0, ST7SUPERLITE 8-BIT A/D CONVERTER (ADC) (Cont'd) 11.4.3.3 Digital A/D Conversion Result The conversion is monotonic, meaning that the result never decreases if the analog input does not and never increases if the analog input does not. If the input voltage (VAIN) is greater than or equal to V DDA (high-level voltage reference) then the conversion result in the DR register is FFh (full scale) without overflow indication. If input voltage (VAIN) is lower than or equal to VSSA (low-level voltage reference) then the conversion result in the DR register is 00h. The A/D converter is linear and the digital result of the conversion is stored in the ADCDR register. The accuracy of the conversion is described in the parametric section. RAIN is the maximum recommended impedance for an analog input signal. If the impedance is too high, this will result in a loss of accuracy due to leakage and sampling not being completed in the alloted time. 11.4.3.4 A/D Conversion Phases The A/D conversion is based on two conversion phases as shown in Figure 44: s Sample capacitor loading [duration: tSAMPLE] During this phase, the VAIN input voltage to be measured is loaded into the CADC sample capacitor. s A/D conversion [duration: tHOLD] During this phase, the A/D conversion is computed (8 successive approximations cycles) and the CADC sample capacitor is disconnected from the analog input pin to get the optimum analog to digital conversion accuracy. s The total conversion time: tCONV = tSAMPLE + tHOLD While the ADC is on, these two phases are continuously repeated. At the end of each conversion, the sample capacitor is kept loaded with the previous measurement load. The advantage of this behaviour is that it minimizes the current consumption on the analog pin in case of single input channel measurement. 11.4.3.5 Software Procedure Refer to the control/status register (CSR) and data register (DR) in Section 11.4.6 for the bit definitions and to Figure 44 for the timings. ADC Configuration The analog input ports must be configured as input, no pull-up, no interrupt. Refer to the I/O ports chapter. Using these pins as analog inputs does not affect the ability of the port to be read as a logic input. In the CSR register: - Select the CH[2:0] bits to assign the analog channel to be converted. ADC Conversion In the CSR register: - Set the ADON bit to enable the A/D converter and to start the first conversion. From this time on, the ADC performs a continuous conversion of the selected channel. When a conversion is complete - The EOC bit is set by hardware. - No interrupt is generated. - The result is in the DR register and remains valid until the next conversion has ended. A write to the ADCCSR register (with ADON set) aborts the current conversion, resets the EOC bit and starts a new conversion. Figure 44. ADC Conversion Timings ADON tCONV tHOLD ADCCSR WRITE OPERATION HOLD CONTROL tSAMPLE EOC BIT SET 11.4.4 Low Power Modes Mode WAIT HALT Description No effect on A/D Converter A/D Converter disabled. After wakeup from Halt mode, the A/D Converter requires a stabilization time before accurate conversions can be performed. Note: The A/D converter may be disabled by resetting the ADON bit. This feature allows reduced power consumption when no conversion is needed and between single shot conversions. 11.4.5 Interrupts None 69/122 1 ST7LITE0, ST7SUPERLITE 8-BIT A/D CONVERTER (ADC) (Cont'd) 11.4.6 Register Description CONTROL/STATUS REGISTER (ADCCSR) Read /Write Reset Value: 0000 0000 (00h) 7 EOC SPEED ADON 0 0 CH2 CH1 DATA REGISTER (ADCDAT) Read Only Reset Value: 0000 0000 (00h) 0 CH0 7 D7 D6 D5 D4 D3 D2 D1 0 D0 Bit 7 = EOC Conversion Complete This bit is set by hardware. It is cleared by software reading the result in the DR register or writing to the CSR register. 0: Conversion is not complete 1: Conversion can be read from the DR register Bit 6 = SPEED ADC clock selection This bit is set and cleared by software. It is used together with the SLOW bit to configure the ADC clock speed. Refer to the table in the SLOW bit description. Bit 5 = ADON A/D Converter and Amplifier On This bit is set and cleared by software. 0: A/D converter and amplifier are switched off 1: A/D converter and amplifier are switched on Note: Amplifier not available on ST7LITES5 devices Bit 4:3 = Reserved. must always be cleared. Bits 2:0 = CH[2:0] Channel Selection These bits are set and cleared by software. They select the analog input to convert. Channel Pin1 AIN0 AIN1 AIN2 AIN3 AIN4 CH2 0 0 0 0 1 CH1 0 0 1 1 0 CH0 0 1 0 1 0 Bits 7:0 = D[7:0] Analog Converted Value This register contains the converted analog value in the range 00h to FFh. Note: Reading this register reset the EOC flag. AMPLIFIER CONTROL REGISTER (ADCAMP) Read/Write Reset Value: 0000 0000 (00h) 7 0 0 0 0 SLOW AMPSEL 0 0 0 Bit 7:4 = Reserved. Forced by hardware to 0. Bit 3 = SLOW Slow mode This bit is set and cleared by software. It is used together with the SPEED bit to configure the ADC clock speed as shown on the table below. fADC SLOW SPEED 0 0 1 0 1 x fCPU/2 fCPU fCPU/4 Notes: 1. The number of pins AND the channel selection varies according to the device. Refer to the device pinout. 2. A write to the ADCCSR register (with ADON set) aborts the current conversion, resets the EOC bit and starts a new conversion. Bit 2 = AMPSEL Amplifier Selection Bit This bit is set and cleared by software. For ST7LITES5 devices, this bit must be kept at its reset value (0). 0: Amplifier is not selected 1: Amplifier is selected Note: When AMPSEL=1 it is mandatory that fADC be less than or equal to 2 MHz. Bit 1:0 = Reserved. Forced by hardware to 0. Note: If ADC settings are changed by writing the ADCAMP register while the ADC is running, a dummy conversion is needed before obtaining results with the new settings. 70/122 1 ST7LITE0, ST7SUPERLITE Table 17. ADC Register Map and Reset Values Address (Hex.) 34h 35h 36h Register Label ADCCSR Reset Value ADCDAT Reset Value ADCAMP Reset Value 7 EOC 0 D7 0 0 6 SPEED 0 D6 0 0 5 ADON 0 D5 0 0 4 3 2 CH2 0 D2 0 AMPSEL 0 1 CH1 0 D1 0 0 0 CH0 0 D0 0 0 0 D4 0 0 0 D3 0 SLOW 0 71/122 1 ST7LITE0, ST7SUPERLITE 12 INSTRUCTION SET 12.1 ST7 ADDRESSING MODES The ST7 Core features 17 different addressing modes which can be classified in 7 main groups: Addressing Mode Inherent Immediate Direct Indexed Indirect Relative Bit operation Example nop ld A,#$55 ld A,$55 ld A,($55,X) ld A,([$55],X) jrne loop bset byte,#5 The ST7 Instruction set is designed to minimize the number of bytes required per instruction: To do Table 18. ST7 Addressing Mode Overview Mode Inherent Immediate Short Long No Offset Short Long Short Long Short Long Relative Relative Bit Bit Bit Bit Direct Direct Direct Direct Direct Indirect Indirect Indirect Indirect Direct Indirect Direct Indirect Direct Indirect Relative Relative Indexed Indexed Indexed Indexed Indexed nop ld A,#$55 ld A,$10 ld A,$1000 ld A,(X) ld A,($10,X) ld A,($1000,X) ld A,[$10] ld A,[$10.w] ld A,([$10],X) ld A,([$10.w],X) jrne loop jrne [$10] bset $10,#7 bset [$10],#7 btjt $10,#7,skip Syntax so, most of the addressing modes may be subdivided in two sub-modes called long and short: - Long addressing mode is more powerful because it can use the full 64 Kbyte address space, however it uses more bytes and more CPU cycles. - Short addressing mode is less powerful because it can generally only access page zero (0000h 00FFh range), but the instruction size is more compact, and faster. All memory to memory instructions use short addressing modes only (CLR, CPL, NEG, BSET, BRES, BTJT, BTJF, INC, DEC, RLC, RRC, SLL, SRL, SRA, SWAP) The ST7 Assembler optimizes the use of long and short addressing modes. Destination/ Source Pointer Address (Hex.) Pointer Size (Hex.) +0 +1 Length (Bytes) 00..FF 0000..FFFF 00..FF 00..1FE 0000..FFFF 00..FF 0000..FFFF 00..1FE 0000..FFFF PC-128/PC+1271) PC-128/PC+1271) 00..FF 00..FF 00..FF 00..FF byte 00..FF byte 00..FF byte 00..FF 00..FF 00..FF 00..FF byte word byte word +1 +2 + 0 (with X register) + 1 (with Y register) +1 +2 +2 +2 +2 +2 +1 +2 +1 +2 +2 +3 btjt [$10],#7,skip 00..FF Note 1. At the time the instruction is executed, the Program Counter (PC) points to the instruction following JRxx. 72/122 1 ST7LITE0, ST7SUPERLITE ST7 ADDRESSING MODES (Cont'd) 12.1.1 Inherent All Inherent instructions consist of a single byte. The opcode fully specifies all the required information for the CPU to process the operation. Inherent Instruction NOP TRAP WFI HALT RET IRET SIM RIM SCF RCF RSP LD CLR PUSH/POP INC/DEC TNZ CPL, NEG MUL SLL, SRL, SRA, RLC, RRC SWAP Function No operation S/W Interrupt Wait For Interrupt (Low Power Mode) Halt Oscillator (Lowest Power Mode) Sub-routine Return Interrupt Sub-routine Return Set Interrupt Mask Reset Interrupt Mask Set Carry Flag Reset Carry Flag Reset Stack Pointer Load Clear Push/Pop to/from the stack Increment/Decrement Test Negative or Zero 1 or 2 Complement Byte Multiplication Shift and Rotate Operations Swap Nibbles 12.1.3 Direct In Direct instructions, the operands are referenced by their memory address. The direct addressing mode consists of two submodes: Direct (short) The address is a byte, thus requires only one byte after the opcode, but only allows 00 - FF addressing space. Direct (long) The address is a word, thus allowing 64 Kbyte addressing space, but requires 2 bytes after the opcode. 12.1.4 Indexed (No Offset, Short, Long) In this mode, the operand is referenced by its memory address, which is defined by the unsigned addition of an index register (X or Y) with an offset. The indirect addressing mode consists of three sub-modes: Indexed (No Offset) There is no offset, (no extra byte after the opcode), and allows 00 - FF addressing space. Indexed (Short) The offset is a byte, thus requires only one byte after the opcode and allows 00 - 1FE addressing space. Indexed (long) The offset is a word, thus allowing 64 Kbyte addressing space and requires 2 bytes after the opcode. 12.1.5 Indirect (Short, Long) The required data byte to do the operation is found by its memory address, located in memory (pointer). The pointer address follows the opcode. The indirect addressing mode consists of two sub-modes: Indirect (short) The pointer address is a byte, the pointer size is a byte, thus allowing 00 - FF addressing space, and requires 1 byte after the opcode. Indirect (long) The pointer address is a byte, the pointer size is a word, thus allowing 64 Kbyte addressing space, and requires 1 byte after the opcode. 12.1.2 Immediate Immediate instructions have two bytes, the first byte contains the opcode, the second byte contains the operand value. Immediate Instruction LD CP BCP AND, OR, XOR ADC, ADD, SUB, SBC Load Compare Bit Compare Logical Operations Arithmetic Operations Function 73/122 1 ST7LITE0, ST7SUPERLITE ST7 ADDRESSING MODES (Cont'd) 12.1.6 Indirect Indexed (Short, Long) This is a combination of indirect and short indexed addressing modes. The operand is referenced by its memory address, which is defined by the unsigned addition of an index register value (X or Y) with a pointer value located in memory. The pointer address follows the opcode. The indirect indexed addressing mode consists of two sub-modes: Indirect Indexed (Short) The pointer address is a byte, the pointer size is a byte, thus allowing 00 - 1FE addressing space, and requires 1 byte after the opcode. Indirect Indexed (Long) The pointer address is a byte, the pointer size is a word, thus allowing 64 Kbyte addressing space, and requires 1 byte after the opcode. Table 19. Instructions Supporting Direct, Indexed, Indirect and Indirect Indexed Addressing Modes Long and Short Instructions LD CP AND, OR, XOR ADC, ADD, SUB, SBC BCP Load Compare Logical Operations Arithmetic Addition/subtraction operations Bit Compare Function SWAP CALL, JP Swap Nibbles Call or Jump subroutine 12.1.7 Relative Mode (Direct, Indirect) This addressing mode is used to modify the PC register value by adding an 8-bit signed offset to it. Available Relative Direct/ Indirect Instructions JRxx CALLR Function Conditional Jump Call Relative The relative addressing mode consists of two submodes: Relative (Direct) The offset follows the opcode. Relative (Indirect) The offset is defined in memory, of which the address follows the opcode. Short Instructions Only CLR INC, DEC TNZ CPL, NEG BSET, BRES BTJT, BTJF SLL, SRL, SRA, RLC, RRC Clear Function Increment/Decrement Test Negative or Zero 1 or 2 Complement Bit Operations Bit Test and Jump Operations Shift and Rotate Operations 74/122 1 ST7LITE0, ST7SUPERLITE 12.2 INSTRUCTION GROUPS The ST7 family devices use an Instruction Set consisting of 63 instructions. The instructions may Load and Transfer Stack operation Increment/Decrement Compare and Tests Logical operations Bit Operation Conditional Bit Test and Branch Arithmetic operations Shift and Rotates Unconditional Jump or Call Conditional Branch Interruption management Condition Code Flag modification LD PUSH INC CP AND BSET BTJT ADC SLL JRA JRxx TRAP SIM WFI RIM HALT SCF IRET RCF CLR POP DEC TNZ OR BRES BTJF ADD SRL JRT SUB SRA JRF SBC RLC JP MUL RRC CALL SWAP CALLR SLA NOP RET BCP XOR CPL NEG RSP be subdivided into 13 main groups as illustrated in the following table: Using a pre-byte The instructions are described with one to four bytes. In order to extend the number of available opcodes for an 8-bit CPU (256 opcodes), three different prebyte opcodes are defined. These prebytes modify the meaning of the instruction they precede. The whole instruction becomes: PC-2 End of previous instruction PC-1 Prebyte PC Opcode PC+1 Additional word (0 to 2) according to the number of bytes required to compute the effective address These prebytes enable instruction in Y as well as indirect addressing modes to be implemented. They precede the opcode of the instruction in X or the instruction using direct addressing mode. The prebytes are: PDY 90 Replace an X based instruction using immediate, direct, indexed, or inherent addressing mode by a Y one. PIX 92 Replace an instruction using direct, direct bit, or direct relative addressing mode to an instruction using the corresponding indirect addressing mode. It also changes an instruction using X indexed addressing mode to an instruction using indirect X indexed addressing mode. PIY 91 Replace an instruction using X indirect indexed addressing mode by a Y one. 75/122 1 ST7LITE0, ST7SUPERLITE INSTRUCTION GROUPS (Cont'd) Mnemo ADC ADD AND BCP BRES BSET BTJF BTJT CALL CALLR CLR CP CPL DEC HALT IRET INC JP JRA JRT JRF JRIH JRIL JRH JRNH JRM JRNM JRMI JRPL JREQ JRNE JRC JRNC JRULT JRUGE JRUGT Description Add with Carry Addition Logical And Bit compare A, Memory Bit Reset Bit Set Jump if bit is false (0) Jump if bit is true (1) Call subroutine Call subroutine relative Clear Arithmetic Compare One Complement Decrement Halt Interrupt routine return Increment Absolute Jump Jump relative always Jump relative Never jump Jump if ext. interrupt = 1 Jump if ext. interrupt = 0 Jump if H = 1 Jump if H = 0 Jump if I = 1 Jump if I = 0 Jump if N = 1 (minus) Jump if N = 0 (plus) Jump if Z = 1 (equal) Jump if Z = 0 (not equal) Jump if C = 1 Jump if C = 0 Jump if C = 1 Jump if C = 0 Jump if (C + Z = 0) H=1? H=0? I=1? I=0? N=1? N=0? Z=1? Z=0? C=1? C=0? Unsigned < Jmp if unsigned >= Unsigned > jrf * Pop CC, A, X, PC inc X jp [TBL.w] reg, M H tst(Reg - M) A = FFH-A dec Y reg, M reg reg, M reg, M 0 I N N Z Z C M 0 N N N 1 Z Z Z C 1 Function/Example A=A+M+C A=A+M A=A.M tst (A . M) bres Byte, #3 bset Byte, #3 btjf Byte, #3, Jmp1 btjt Byte, #3, Jmp1 A A A A M M M M C C Dst M M M M Src H H H I N N N N N Z Z Z Z Z C C C 76/122 1 ST7LITE0, ST7SUPERLITE INSTRUCTION GROUPS (Cont'd) Mnemo JRULE LD MUL NEG NOP OR POP Description Jump if (C + Z = 1) Load Multiply Negate (2's compl) No Operation OR operation Pop from the Stack A=A+M pop reg pop CC PUSH RCF RET RIM RLC RRC RSP SBC SCF SIM SLA SLL SRL SRA SUB SWAP TNZ TRAP WFI XOR Push onto the Stack Reset carry flag Subroutine Return Enable Interrupts Rotate left true C Rotate right true C Reset Stack Pointer Subtract with Carry Set carry flag Disable Interrupts Shift left Arithmetic Shift left Logic Shift right Logic Shift right Arithmetic Subtraction SWAP nibbles Test for Neg & Zero S/W trap Wait for Interrupt Exclusive OR A = A XOR M A M I=0 C <= Dst <= C C => Dst => C S = Max allowed A=A-M-C C=1 I=1 C <= Dst <= 0 C <= Dst <= 0 0 => Dst => C Dst7 => Dst => C A=A-M reg, M reg, M reg, M reg, M A M 1 N N 0 N N N N 1 0 N Z Z Z Z Z Z Z Z C C C C C A M N Z C 1 reg, M reg, M 0 N N Z Z C C push Y C=0 A reg CC M M M M reg, CC 0 H I N Z C N Z Function/Example Unsigned <= dst <= src X,A = X * A neg $10 reg, M A, X, Y reg, M M, reg X, Y, A 0 N Z N Z 0 C Dst Src H I N Z C Dst[7..4] <=> Dst[3..0] reg, M tnz lbl1 S/W interrupt 77/122 1 ST7LITE0, ST7SUPERLITE 13 ELECTRICAL CHARACTERISTICS 13.1 PARAMETER CONDITIONS Unless otherwise specified, all voltages are referred to V SS. 13.1.1 Minimum and Maximum values Unless otherwise specified the minimum and maximum values are guaranteed in the worst conditions of ambient temperature, supply voltage and frequencies by tests in production on 100% of the devices with an ambient temperature at TA=25C and TA=TAmax (given by the selected temperature range). Data based on characterization results, design simulation and/or technology characteristics are indicated in the table footnotes and are not tested in production. Based on characterization, the minimum and maximum values refer to sample tests and represent the mean value plus or minus three times the standard deviation (mean3). 13.1.2 Typical values Unless otherwise specified, typical data are based on TA=25C, VDD=5V (for the 4.5VVDD5.5V voltage range), VDD=3.75V (for the 3VVDD4.5V voltage range) and VDD=2.7V (for the 2.4VVDD3V voltage range). They are given only as design guidelines and are not tested. 13.1.3 Typical curves Unless otherwise specified, all typical curves are given only as design guidelines and are not tested. 13.1.4 Loading capacitor The loading conditions used for pin parameter measurement are shown in Figure 45. Figure 45. Pin loading conditions 13.1.5 Pin input voltage The input voltage measurement on a pin of the device is described in Figure 46. Figure 46. Pin input voltage ST7 PIN VIN ST7 PIN CL 78/122 1 ST7LITE0, ST7SUPERLITE 13.2 ABSOLUTE MAXIMUM RATINGS Stresses above those listed as "absolute maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device under these condi13.2.1 Voltage Characteristics Symbol VDD - VSS VIN VESD(HBM) VESD(MM) Supply voltage Input voltage on any pin 1) & 2) tions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Ratings Maximum value 7.0 VSS-0.3 to VDD+0.3 Unit V Electrostatic discharge voltage (Human Body Model) Electrostatic discharge voltage (Machine Model) see section 13.7.2 on page 91 13.2.2 Current Characteristics Symbol IVDD IVSS IIO IINJ(PIN) 2) & 4) IINJ(PIN) 2) Ratings Total current into VDD power lines (source) Total current out of VSS ground lines (sink) 3) 3) Maximum value 100 100 25 50 - 25 5 5 20 Unit Output current sunk by any standard I/O and control pin Output current sunk by any high sink I/O pin Output current source by any I/Os and control pin Injected current on RESET pin Injected current on any other pin 5) & 6) Total injected current (sum of all I/O and control pins) 5) mA 13.2.3 Thermal Characteristics Symbol TSTG TJ Ratings Storage temperature range Value -65 to +150 Unit C Maximum junction temperature (see Section 14.2 THERMAL CHARACTERISTICS) Notes: 1. Directly connecting the RESET and I/O pins to VDD or VSS could damage the device if an unintentional internal reset is generated or an unexpected change of the I/O configuration occurs (for example, due to a corrupted program counter). To guarantee safe operation, this connection has to be done through a pull-up or pull-down resistor (typical: 4.7k for RESET, 10k for I/Os). Unused I/O pins must be tied in the same way to VDD or VSS according to their reset configuration. 2. When the current limitation is not possible, the VIN absolute maximum rating must be respected, otherwise refer to IINJ(PIN) specification. A positive injection is induced by VIN>VDD while a negative injection is induced by VIN 1 ST7LITE0, ST7SUPERLITE 13.3 OPERATING CONDITIONS 13.3.1 General Operating Conditions: Suffix 6 Devices TA = -40 to +85C unless otherwise specified. Symbol VDD Parameter Supply voltage Conditions fOSC = 8 MHz. max., TA = 0 to 70C fOSC = 8 MHz. max. fOSC = 16 MHz. max. fCLKIN External clock frequency on CLKIN pin VDD3.3V Min 2.4 2.7 3.3 Max 5.5 5.5 5.5 V Unit 0 0 16 8 VDD2.4V, TA = 0 to +70C VDD2.7V MHz Figure 47. fCLKIN Maximum Operating Frequency Versus VDD Supply Voltage fCLKIN [MHz] FUNCTIONALITY GUARANTEED IN THIS AREA (UNLESS OTHERWISE STATED IN THE TABLES OF PARAMETRIC DATA) 16 FUNCTIONALITY NOT GUARANTEED IN THIS AREA 8 FUNCTIONALITY GUARANTEED IN THIS AREA AT TA 0 to 70C 4 1 0 2.0 2.4 2.7 3.3 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE [V] 80/122 1 ST7LITE0, ST7SUPERLITE 13.3.2 Operating Conditions with Low Voltage Detector (LVD) TA = -40 to 125C, unless otherwise specified Symbol VIT+(LVD) Parameter Reset release threshold (VDD rise) Reset generation threshold (VDD fall) LVD voltage threshold hysteresis VDD rise time rate 1) Filtered glitch delay on VDD LVD/AVD current consumption Not detected by the LVD 200 Conditions High Threshold Med. Threshold Low Threshold High Threshold Med. Threshold Low Threshold VIT+(LVD)-VIT-(LVD) 20 Min 4.00 3.40 2.65 3.80 3.20 2.40 Typ 4.25 3.60 2.90 4.05 3.40 2.70 200 20000 150 Max 4.50 3.80 3.15 4.30 3.65 2.90 Unit V VIT-(LVD) Vhys VtPOR tg(VDD) IDD(LVD) mV s/V ns A Notes: 1. Not tested in production. The VDD rise time rate condition is needed to ensure a correct device power-on and LVD reset. When the VDD slope is outside these values, the LVD may not ensure a proper reset of the MCU. 13.3.3 Auxiliary Voltage Detector (AVD) Thresholds TA = -40 to 125C, unless otherwise specified Symbol VIT+(AVD) Parameter 1=>0 AVDF flag toggle threshold (VDD rise) 0=>1 AVDF flag toggle threshold (VDD fall) AVD voltage threshold hysteresis Voltage drop between AVD flag set and LVD reset activation Conditions High Threshold Med. Threshold Low Threshold High Threshold Med. Threshold Low Threshold VIT+(AVD)-VIT-(AVD) VDD fall TBD Min 4.40 3.90 3.20 4.30 3.70 2.90 Typ 4.70 4.10 3.40 4.60 3.90 3.20 150 0.45 Max 5.00 4.30 3.60 4.90 4.10 3.40 Unit V VIT-(AVD) Vhys VIT- mV V 13.3.4 Internal RC Oscillator and PLL The ST7 internal clock can be supplied by an internal RC oscillator and PLL (selectable by option byte). Symbol VDD(RC) VDD(x4PLL) VDD(x8PLL) Parameter Internal RC Oscillator operating voltage x4 PLL operating voltage x8 PLL operating voltage Conditions Min 2.4 2.4 3.3 Typ Max 5.5 3.3 5.5 PLL input clock (fPLL) cycles V Unit tSTARTUP PLL Startup time 60 81/122 1 ST7LITE0, ST7SUPERLITE OPERATING CONDITIONS (Cont'd) The RC oscillator and PLL characteristics are temperature-dependent and are grouped in four tables. 13.3.4.1 Devices with `"6" order code suffix (tested for TA = -40 to +85C) @ VDD = 4.5 to 5.5V Symbol fRC Parameter Conditions Min Typ 760 1000 -1 -5 -21) 9701) 10 11) 2 4 fRC = 1MHz@TA=25C,VDD=4.5 to 5.5V fRC = 1MHz@TA=-40 to +85C,VDD=5V fRC = 1MHz 0.14) 0.1 4) 2) Max Unit kHz Internal RC oscillator fre- RCCR = FF (reset value), TA=25C,VDD=5V quency RCCR = RCCR02 ),TA=25C,VDD=5V Accuracy of Internal RC oscillator with RCCR=RCCR02) TA=25C,VDD=4.5 to 5.5V TA=-40 to +85C,VDD=5V TA=0 to +85C,VDD=4.5 to 5.5V +1 +2 +21) % % % A ACCRC IDD(RC) tsu(RC) fPLL tLOCK tSTAB ACCPLL tw(JIT) JITPLL IDD(PLL) RC oscillator current conTA=25C,VDD=5V sumption RC oscillator setup time x8 PLL input clock PLL Lock time5) PLL Stabilization time5) x8 PLL Accuracy PLL jitter period PLL jitter (fCPU/fCPU) PLL current consumption TA=25C TA=25C,VDD=5V s MHz ms ms % % kHz % A 83) 13) 6001) Notes: 1. Data based on characterization results, not tested in production 2. RCCR0 is a factory-calibrated setting for 1000kHz with 0.2 accuracy @ TA =25C, VDD=5V. See "INTERNAL RC OSCILLATOR ADJUSTMENT" on page 23 3. Guaranteed by design. 4. Averaged over a 4ms period. After the LOCKED bit is set, a period of tSTAB is required to reach ACCPLL accuracy. 5. After the LOCKED bit is set ACCPLL is max. 10% until tSTAB has elapsed. See Figure 12 on page 24. 82/122 1 ST7LITE0, ST7SUPERLITE OPERATING CONDITIONS (Cont'd) 13.3.4.2 Devices with `"6" order code suffix (tested for TA = -40 to +85C) @ VDD = 2.7 to 3.3V Symbol fRC Parameter Conditions Min Typ 560 700 -2 -25 -15 7001) 102) 1 1) Max Unit kHz Internal RC oscillator fre- RCCR = FF (reset value), TA=25C, VDD= 3.0V quency RCCR=RCCR12) ,TA=25C,VDD= 3V Accuracy of Internal RC TA=25C,VDD=3V oscillator when calibrated TA=25C,VDD=2.7 to 3.3V with RCCR=RCCR11)2) TA=-40 to +85C,VDD=3V RC oscillator current conTA=25C,VDD=3V sumption RC oscillator setup time x4 PLL input clock PLL Lock time5) PLL Stabilization time5) x4 PLL Accuracy PLL jitter period PLL jitter (fCPU/fCPU) PLL current consumption TA=25C fRC = 1MHz@TA=25C,VDD=2.7 to 3.3V fRC = 1MHz@TA=40 to +85C,VDD= 3V fRC = 1MHz TA=25C,VDD=3V +2 +25 15 % % % A ACCRC IDD(RC) tsu(RC) s MHz ms ms fPLL tLOCK tSTAB ACCPLL tw(JIT) JITPLL IDD(PLL) 2 4 0.1 4) % % kHz % A 0.14) 83) 13) 1901) Notes: 1. Data based on characterization results, not tested in production 2. RCCR1 is a factory-calibrated setting for 700kHz with 2% accuracy @ TA =25C, VDD=3V. See "INTERNAL RC OSCILLATOR ADJUSTMENT" on page 23. 3. Guaranteed by design. 4. Averaged over a 4ms period. After the LOCKED bit is set, a period of tSTAB is required to reach ACCPLL accuracy 5. After the LOCKED bit is set ACCPLL is max. 10% until tSTAB has elapsed. See Figure 12 on page 24. 83/122 1 ST7LITE0, ST7SUPERLITE OPERATING CONDITIONS (Cont'd) Figure 48. RC Osc Freq vs VDD @ TA=25C (Calibrated with RCCR1: 3V @ 25C) Figure 49. RC Osc Freq vs VDD (Calibrated with RCCR0: 5V@ 25C) 1.00 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.50 2.4 2.6 2.8 3 3.2 VDD (V) 3.4 3.6 3.8 4 1.10 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 2.5 3 3.5 4 4.5 5 5.5 6 Vdd (V) Output Freq (MHz) Output Freq. (MHz) -45 0 25 90 105 130 Figure 50. Typical RC oscillator Accuracy vs temperature @ V DD=5V (Calibrated with RCCR0: 5V @ 25C Figure 51. RC Osc Freq vs V DD and RCCR Value 1.80 2 1 RC Accuracy () * 1.60 Output Freq. (MHz) 1.40 1.20 1.00 0.80 0.60 0.40 0.20 rccr=00h rccr=64h rccr=80h rccr=C0h rccr=FFh 0 -1 -2 -3 -4 -5 () () * * -45 0 25 Temperature (C) 85 125 ( ) tested in production * 0.00 2.4 2.7 3 3.3 3.75 4 4.5 5 5.5 6 Vdd (V) 84/122 1 ST7LITE0, ST7SUPERLITE OPERATING CONDITIONS (Cont'd) Figure 52. PLL fCPU/fCPU versus time fCPU/fCPU Max t 0 Min tw(JIT) tw(JIT) Figure 53. PLLx4 Output vs CLKIN frequency 7.00 Figure 54. PLLx8 Output vs CLKIN frequency 11.00 Output Frequency (MHz) 6.00 5.00 4.00 3.00 2.00 1.00 1 1.5 2 2.5 3 3.3 3 2.7 Output Frequency (MHz) 9.00 7.00 5.00 3.00 1.00 0.85 0.9 1 1.5 2 2.5 5.5 5 4.5 4 External Input Clock Frequency (MHz) External Input Clock Frequency (MHz) Note: fOSC = fCLKIN/2*PLL4 Note: fOSC = fCLKIN/2*PLL8 85/122 1 ST7LITE0, ST7SUPERLITE 13.4 SUPPLY CURRENT CHARACTERISTICS The following current consumption specified for the ST7 functional operating modes over temperature range does not take into account the clock source current consumption. To get the total de13.4.1 Supply Current TA = -40 to +125C unless otherwise specified Symbol Parameter Supply current in RUN mode VDD=5.5V Supply current in WAIT mode IDD Supply current in SLOW mode Supply current in SLOW WAIT mode Supply current in HALT mode vice consumption, the two current values must be added (except for HALT mode for which the clock is stopped). Conditions fCPU=8MHz 1) fCPU=8MHz 2) fCPU=500kHz 3) fCPU=500kHz 4) -40CTA+85C Typ 4.50 1.75 0.75 0.65 Max 7.00 2.70 1.13 1 Unit mA 0.50 5 TA= +125C 10 100 A Notes: 1. CPU running with memory access, all I/O pins in input mode with a static value at VDD or VSS (no load), all peripherals in reset state; clock input (CLKIN) driven by external square wave, LVD disabled. 2. All I/O pins in input mode with a static value at VDD or VSS (no load), all peripherals in reset state; clock input (CLKIN) driven by external square wave, LVD disabled. 3. SLOW mode selected with fCPU based on fOSC divided by 32. All I/O pins in input mode with a static value at VDD or VSS (no load), all peripherals in reset state; clock input (CLKIN) driven by external square wave, LVD disabled. 4. SLOW-WAIT mode selected with fCPU based on fOSC divided by 32. All I/O pins in input mode with a static value at VDD or VSS (no load), all peripherals in reset state; clock input (CLKIN) driven by external square wave, LVD disabled. Figure 55. Typical IDD in RUN vs. fCPU 8MHz 4MHz 1MHz Figure 56. Typical IDD in SLOW vs. fCPU 5.0 4.0 0.80 0.70 0.60 Idd (mA) 0.50 0.40 0.30 0.20 0.10 500kHz 250kHz 125kHz Idd (mA) 3.0 2.0 1.0 0.0 2.4 2.7 3.7 4.5 5 5.5 0.00 2.4 2.7 3.7 4.5 5 5.5 VDD (V) Vdd (V) Figure 57. Typical IDD in WAIT vs. f CPU 2.0 Figure 58. Typical IDD in SLOW-WAIT vs. fCPU 0.70 0.60 0.50 Idd (mA) 0.40 0.30 0.20 0.10 0.00 500kHz 250kHz 125kHz 8MHz 4MHz 1MHz Idd (mA) 1.5 1.0 0.5 0.0 2.4 2.7 3.7 4.5 5 5.5 2.4 2.7 3.7 Vdd (V) 4.5 5 5.5 Vdd (V) 86/122 1 ST7LITE0, ST7SUPERLITE SUPPLY CURRENT CHARACTERISTICS (Cont'd) Figure 59. Typical IDD vs. Temperature at V DD = 5V and fCPU = 8MHz 5.00 4.50 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0.00 -45 25 90 130 Idd (mA) RUN WAIT SLOW SLOW WAIT Temperature (C) 13.4.2 On-chip peripherals Symbol IDD(AT) Parameter 12-bit Auto-Reload Timer supply current 1) SPI supply current 2) ADC supply current when converting 3) Conditions fCPU=4MHz VDD=3.0V VDD=5.0V VDD=3.0V VDD=5.0V VDD=3.0V Typ Unit 50 150 50 300 780 1100 A fCPU=8MHz fCPU=4MHz fCPU=8MHz fADC=4MHz IDD(SPI) IDD(ADC) VDD=5.0V 1. Data based on a differential IDD measurement between reset configuration (timer stopped) and a timer running in PWM mode at fcpu=8MHz. 2. Data based on a differential IDD measurement between reset configuration and a permanent SPI master communication (data sent equal to 55h). 3. Data based on a differential IDD measurement between reset configuration and continuous A/D conversions with amplifier off. 87/122 1 ST7LITE0, ST7SUPERLITE 13.5 CLOCK AND TIMING CHARACTERISTICS Subject to general operating conditions for V DD, fOSC, and TA. 13.5.1 General Timings Symbol tc(INST) tv(IT) Parameter 1 Instruction cycle time Interrupt reaction time tv(IT) = tc(INST) + 10 3) Conditions fCPU=8MHz fCPU=8MHz Min 2 250 10 1.25 Typ 2) 3 375 Max 12 1500 22 2.75 Unit tCPU ns tCPU s Notes: 1. Guaranteed by Design. Not tested in production. 2. Data based on typical application software. 3. Time measured between interrupt event and interrupt vector fetch. Dtc(INST) is the number of tCPU cycles needed to finish the current instruction execution. 88/122 1 ST7LITE0, ST7SUPERLITE 13.6 MEMORY CHARACTERISTICS TA = -40C to 125C, unless otherwise specified 13.6.1 RAM and Hardware Registers Symbol VRM Parameter Data retention mode 1) Conditions HALT mode (or RESET) Min 1.6 Typ Max Unit V 13.6.2 FLASH Program Memory Symbol VDD tprog Parameter Operating voltage for Flash write/erase Programming time for 1~32 bytes 2) Conditions TA=-40 to +85C TA=+25C TA=+55C3) 20 Min 2.4 Typ Max 5.5 Unit V 5 0.24 10 0.48 ms s years cycles Programming time for 1.5 kBytes Data retention 4) Write erase cycles tRET NRW IDD Supply current 10K 7) TA=+25C Read / Write / Erase modes fCPU = 8MHz, VDD = 5.5V No Read/No Write Mode Power down mode / HALT 2.6 6) 100 0.1 mA A A 0 13.6.3 EEPROM Data Memory Symbol tprog Parameter Programming time for 1~32 bytes Data retention 4) Write erase cycles Conditions TA=-40 to +85C TA=+55C 3) TA=+25C 20 300K 7) Min Typ Max Unit 5 10 ms years cycles tret NRW Notes: 1. Minimum VDD supply voltage without losing data stored in RAM (in HALT mode or under RESET) or in hardware registers (only in HALT mode). Guaranteed by construction, not tested in production. 2. Up to 32 bytes can be programmed at a time. 3. The data retention time increases when the TA decreases. 4. Data based on reliability test results and monitored in production. 5. Data based on characterization results, not tested in production. 6. Guaranteed by Design. Not tested in production. 7. Design target value pending full product characterization. 89/122 1 ST7LITE0, ST7SUPERLITE 13.7 EMC CHARACTERISTICS Susceptibility tests are performed on a sample basis during product characterization. 13.7.1 Functional EMS (Electro Magnetic Susceptibility) Based on a simple running application on the product (toggling 2 LEDs through I/O ports), the product is stressed by two electro magnetic events until a failure occurs (indicated by the LEDs). ESD: Electro-Static Discharge (positive and negative) is applied on all pins of the device until a functional disturbance occurs. This test conforms with the IEC 1000-4-2 standard. s FTB: A Burst of Fast Transient voltage (positive and negative) is applied to V DD and VSS through a 100pF capacitor, until a functional disturbance occurs. This test conforms with the IEC 1000-44 standard. A device reset allows normal operations to be resumed. s Symbol VFESD Parameter Voltage limits to be applied on any I/O pin to induce a functional disturbance Conditions VDD=5V, TA=+25C, fOSC=8MHz conforms to IEC 1000-4-2 Neg 1) Pos 1) Unit -0.7 -1.2 >1.5 kV 1.2 VFFTB Fast transient voltage burst limits to be apVDD=5V, TA=+25C, fOSC=8MHz plied through 100pF on VDD and VDD pins conforms to IEC 1000-4-4 to induce a functional disturbance Figure 60. EMC Recommended power supply connection 2) ST72XXX 10F 0.1F ST7 DIGITAL NOISE FILTERING VDD VSS VDD Notes: 1. Data based on characterization results, not tested in production. 2. The suggested 10F and 0.1F decoupling capacitors on the power supply lines are proposed as a good price vs. EMC performance tradeoff. They have to be put as close as possible to the device power supply pins. Other EMC recommendations are given in other sections (I/Os, RESET, OSCx pin characteristics). 90/122 1 ST7LITE0, ST7SUPERLITE EMC CHARACTERISTICS (Cont'd) 13.7.2 Absolute Electrical Sensitivity Based on three different tests (ESD, LU and DLU) using specific measurement methods, the product is stressed in order to determine its performance in terms of electrical sensitivity. For more details, refer to the AN1181 ST7 application note. 13.7.2.1 Electro-Static Discharge (ESD) Electro-Static Discharges (3 positive then 3 negative pulses separated by 1 second) are applied to the pins of each sample according to each pin combination. The sample size depends of the number of supply pins of the device (3 parts*(n+1) supply pin). Two models are usually simulated: Human Body Model and Machine Model. This test conforms to the JESD22-A114A/A115A standard. See Figure 61 and the following test sequences. Human Body Model Test Sequence - C L is loaded through S1 by the HV pulse generator. - S1 switches position from generator to R. - A discharge from CL through R (body resistance) to the ST7 occurs. - S2 must be closed 10 to 100ms after the pulse delivery period to ensure the ST7 is not left in charge state. S2 must be opened at least 10ms prior to the delivery of the next pulse. Absolute Maximum Ratings Symbol VESD(HBM) Ratings Electro-static discharge voltage (Human Body Model) Electro-static discharge voltage (Machine Model) TA=+25C TA=+25C Conditions Maximum value 1) Unit Machine Model Test Sequence - CL is loaded through S1 by the HV pulse generator. - S1 switches position from generator to ST7. - A discharge from CL to the ST7 occurs. - S2 must be closed 10 to 100ms after the pulse delivery period to ensure the ST7 is not left in charge state. S2 must be opened at least 10ms prior to the delivery of the next pulse. - R (machine resistance), in series with S2, ensures a slow discharge of the ST7. 4000 V TBD VESD(MM) Figure 61. Typical Equivalent ESD Circuits S1 R=1500 S1 R=10k~10M HIGH VOLTAGE PULSE GENERATOR CL=100pF ST7 S2 HIGH VOLTAGE PULSE GENERATOR CL=200pF ST7 S2 HUMAN BODY MODEL MACHINE MODEL Notes: 1. Data based on characterization results, not tested in production. 91/122 1 ST7LITE0, ST7SUPERLITE EMC CHARACTERISTICS (Cont'd) 13.7.2.2 Static and Dynamic Latch-Up s LU: 3 complementary static tests are required on 10 parts to assess the latch-up performance. A supply overvoltage (applied to each power supply pin), a current injection (applied to each input, output and configurable I/O pin) and a power supply switch sequence are performed on each sample. This test conforms to the EIA/ JESD 78 IC latch-up standard. For more details, refer to the AN1181 ST7 application note. s DLU: Electro-Static Discharges (one positive then one negative test) are applied to each pin of 3 samples when the micro is running to assess the latch-up performance in dynamic mode. Power supplies are set to the typical values, the oscillator is connected as near as possible to the pins of the micro and the component is put in reset mode. This test conforms to the IEC1000-4-2 and SAEJ1752/3 standards and is described in Figure 62. For more details, refer to the AN1181 ST7 application note. Electrical Sensitivities Symbol LU Parameter Static latch-up class TA=+25C TA=+85C Conditions Class 1) A A A DLU Dynamic latch-up class VDD=5.5V, fOSC=4MHz, TA=+25C Figure 62. Simplified Diagram of the ESD Generator for DLU RCH=50M RD=330 DISCHARGE TIP VDD VSS CS=150pF ESD GENERATOR 2) HV RELAY ST7 DISCHARGE RETURN CONNECTION Notes: 1. Class description: A Class is an STMicroelectronics internal specification. All its limits are higher than the JEDEC specifications, that means when a device belongs to Class A it exceeds the JEDEC standard. B Class strictly covers all the JEDEC criteria (international standard). 2. Schaffner NSG435 with a pointed test finger. 92/122 1 ST7LITE0, ST7SUPERLITE EMC CHARACTERISTICS (Cont'd) 13.7.3 ESD Pin Protection Strategy To protect an integrated circuit against ElectroStatic Discharge the stress must be controlled to prevent degradation or destruction of the circuit elements. The stress generally affects the circuit elements which are connected to the pads but can also affect the internal devices when the supply pads receive the stress. The elements to be protected must not receive excessive current, voltage or heating within their structure. An ESD network combines the different input and output ESD protections. This network works, by allowing safe discharge paths for the pins subjected to ESD stress. Two critical ESD stress cases are presented in Figure 63 and Figure 64 for standard pins. Standard Pin Protection To protect the output structure the following elements are added: - A diode to VDD (3a) and a diode from VSS (3b) - A protection device between VDD and V SS (4) To protect the input structure the following elements are added: - A resistor in series with the pad (1) - A diode to VDD (2a) and a diode from VSS (2b) - A protection device between VDD and V SS (4) Figure 63. Positive Stress on a Standard Pad vs. VSS VDD VDD (3a) (2a) (1) OUT (4) IN Main path Path to avoid (3b) (2b) VSS VSS Figure 64. Negative Stress on a Standard Pad vs. VDD VDD VDD (3a) (2a) (1) OUT (4) IN Main path (3b) (2b) VSS VSS 93/122 1 ST7LITE0, ST7SUPERLITE 13.8 I/O PORT PIN CHARACTERISTICS 13.8.1 General Characteristics Subject to general operating conditions for V DD, fOSC, and TA unless otherwise specified. Symbol VIL VIH Vhys IL IS RPU CIO tf(IO)out tr(IO)out tw(IT)in Parameter Input low level voltage Input high level voltage Schmitt trigger voltage hysteresis 1) Input leakage current Static current consumption 2) Weak pull-up equivalent resistor3) I/O pin capacitance Output high to low level fall time 1) Output low to high level rise time 1) External interrupt pulse time 4) CL=50pF Between 10% and 90% 1 VSSVINVDD Floating input mode VIN=VSS VDD=5V VDD=3V 50 120 160 5 25 ns 25 tCPU 0.7xVDD 400 1 200 250 Conditions Min Typ Max 0.3xVDD Unit V mV A k pF Notes: 1. Data based on characterization results, not tested in production. 2. Configuration not recommended, all unused pins must be kept at a fixed voltage: using the output mode of the I/O for example or an external pull-up or pull-down resistor (see Figure 65). Data based on design simulation and/or technology characteristics, not tested in production. 3. The RPU pull-up equivalent resistor is based on a resistive transistor (corresponding IPU current characteristics described in Figure 66). 4. To generate an external interrupt, a minimum pulse width has to be applied on an I/O port pin configured as an external interrupt source. Figure 65. Two typical Applications with unused I/O Pin VDD 10k ST7XXX 10k UNUSED I/O PORT UNUSED I/O PORT ST7XXX Note: only external pull-up allowed on ICCCLK pin Figure 66. Typical IPU vs. VDD with V IN=VSS l 90 80 70 60 Ip u(uA ) 50 40 30 20 10 0 2 2.5 3 3.5 4 4.5 Vdd(V) 5 5.5 6 Ta=1 40C Ta=9 5C Ta=2 5C Ta=-45 C TO BE CHARACTERIZED 94/122 1 ST7LITE0, ST7SUPERLITE I/O PORT PIN CHARACTERISTICS (Cont'd) 13.8.2 Output Driving Current Subject to general operating conditions for V DD, fCPU, and TA unless otherwise specified. Symbol Parameter Output low level voltage for a standard I/O pin when 8 pins are sunk at same time (see Figure 70) VOL 1) Conditions IIO=+5mA TA85C TA85C Min Max Unit 1.0 1.2 0.4 0.5 1.3 1.5 0.75 0.85 IIO=+2mA TA85C TA85C VDD=5V Output low level voltage for a high sink I/O pin when 4 pins are sunk at same time (see Figure 72) Output high level voltage for an I/O pin when 4 pins are sourced at same time (see Figure 78) IIO=+20mA,TA85C TA85C IIO=+8mA TA85C TA85C IIO=-5mA, TA85C VDD-1.5 TA85C VDD-1.6 IIO=-2mA T A85C VDD-0.8 TA85C VDD-1.0 VOH 2) VDD=3.3V Output low level voltage for a standard I/O pin when 8 pins are sunk at same time VOL 1)3) (see Figure 69) Output low level voltage for a high sink I/O pin when 4 pins are sunk at same time IIO=+2mA TA85C TA85C 0.5 0.6 0.5 0.6 V IIO=+8mA TA85C TA85C IIO=-2mA T A85C VDD-0.8 TA85C VDD-1.0 VOH 2)3) Output high level voltage for an I/O pin when 4 pins are sourced at same time Output high level voltage for an I/O pin VOH 2)3) when 4 pins are sourced at same time (see Figure 75) Notes: VDD=2.7V Output low level voltage for a standard I/O pin when 8 pins are sunk at same time 1)3) (see Figure 68) VOL Output low level voltage for a high sink I/O pin when 4 pins are sunk at same time IIO=+2mA TA85C TA85C 0.6 0.7 0.6 0.7 IIO=+8mA TA85C TA85C IIO=-2mA T A85C VDD-0.9 TA85C VDD-1.0 1. The IIO current sunk must always respect the absolute maximum rating specified in Section 13.2.2 and the sum of IIO (I/O ports and control pins) must not exceed IVSS. 2. The IIO current sourced must always respect the absolute maximum rating specified in Section 13.2.2 and the sum of IIO (I/O ports and control pins) must not exceed IVDD. True open drain I/O pins does not have VOH. 3. Not tested in production, based on characterization results. Figure 67. Typical VOL at VDD=2.4V (standard) 0.70 0.60 VOL at VDD=2.4V 0.50 0.40 0.30 0.20 0.10 0.00 0.01 1 lio (mA) 2 -45 0C Figure 68. Typical VOL at VDD=2.7V (standard) 0.60 0.50 VOL at VDD=2.7V 0.40 0.30 0.20 0.10 0.00 0.01 1 lio (mA) 2 -45C 0C 25C 90C 130C TO BE CHARACTERIZED 25C 90C 130C 95/122 1 ST7LITE0, ST7SUPERLITE I/O PORT PIN CHARACTERISTICS (Cont'd) Figure 69. Typical VOL at VDD=3.3V (standard) Figure 70. Typical VOL at VDD=5V (standard) 0.70 0.60 VOL at VDD=3.3V 0.50 0.40 0.30 0.20 0.10 0.00 0.01 1 lio (mA) 2 3 -45C 0C 25C 90C 130C 0.80 0.70 VOL at VDD=5V 0.60 0.50 0.40 0.30 0.20 0.10 0.00 0.01 1 2 lio (mA) 3 4 5 -45C 0C 25C 90C 130C Figure 71. Typical VOL at VDD=2.4V (high-sink) 1.00 0.90 Figure 73. Typical VOL at VDD=3V (high-sink) 1.20 1.00 0.80 0.60 0.40 0.20 0.00 6 7 8 lio (mA) 9 10 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 -45 0C 25C 90C 130C Vol (V) at VDD=3V (HS) 0.80 VOL at VDD=2.4V (HS) -45 0C 25C 90C 130C 6 7 8 9 lio (mA) 10 15 Figure 72. Typical VOL at VDD=5V (high-sink) 2.50 2.00 Vol (V) at VDD=5V (HS) 1.50 1.00 -45 0C 25C 90C 130C 0.50 0.00 6 7 8 9 10 15 lio (mA) 20 25 30 35 40 96/122 1 ST7LITE0, ST7SUPERLITE I/O PORT PIN CHARACTERISTICS (Cont'd) Figure 74. Typical VDD-VOH at VDD=2.4V Figure 76. Typical VDD-VOH at VDD=3V 1.60 1.40 VDD-VOH at VDD=3V 1.20 1.00 0.80 0.60 0.40 0.20 0.00 -0.01 -1 lio (mA) -2 1.60 1.40 VDD-VOH at VDD=2.4V 1.20 1.00 0.80 0.60 0.40 0.20 0.00 -45C 0C 25C 90C 130C -45C 0C 25C 90C 130C -0.01 -1 lio (mA) -2 -3 Figure 75. Typical VDD-VOH at VDD=2.7V 1.20 1.00 VDD-VOH at VDD=2.7V 0.80 0.60 0.40 0.20 0.00 -0.01 -1 lio(mA) -2 Figure 77. Typical VDD-VOH at VDD=4V 2.50 2.00 VDD-VOH at VDD=4V -45C 0C 25C 90C 130C -45C 0C 25C 90C 130C 1.50 1.00 0.50 0.00 -0.01 -1 -2 lio (mA) -3 -4 -5 Figure 78. Typical VDD-VOH at VDD=5V 2.00 1.80 VDD-VOH at VDD=5V 1.60 1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 -0.01 -1 -2 lio (mA) -3 -4 -5 -45C 0C 25C 90C 130C TO BE CHARACTERIZED 97/122 1 ST7LITE0, ST7SUPERLITE I/O PORT PIN CHARACTERISTICS (Cont'd) Figure 79. Typical VOL vs. VDD (standard I/Os) 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 2.4 2.7 VDD (V) 3.3 5 -45 0C 25C 90C 130C Vol (V) at lio=0.01mA Vol (V) at lio=2mA 0.06 0.05 0.04 0.03 0.02 0.01 0.00 2.4 2.7 VDD (V) 3.3 5 -45 0C 25C 90C 130C Figure 80. Typical VOL vs. VDD (high-sink I/Os) 0.70 VOL vs VDD (HS) at lio=20mA 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 2.4 3 VDD (V) 5 -45 0C 25C 90C 130C VOL vs VDD (HS) at lio=8mA 0.60 0.50 0.40 0.30 0.20 0.10 0.00 2.4 3 VDD (V) 5 -45 0C 25C 90C 130C Figure 81. Typical VDD-VOH vs. VDD 1.80 1.70 1.60 VDD-VOH at lio=-5mA 1.50 1.40 1.30 1.20 1.10 1.00 0.90 0.80 4 VDD 5 -45C 0C 25C 90C 130C 1.10 VDD-VOH (V) at lio=-2mA 1.00 0.90 0.80 0.70 0.60 0.50 0.40 2.4 2.7 3 VDD (V) 4 5 -45C 0C 25C 90C 130C 98/122 1 ST7LITE0, ST7SUPERLITE 13.9 CONTROL PIN CHARACTERISTICS 13.9.1 Asynchronous RESET Pin TA = -40C to 125C, unless otherwise specified Symbol VIL VIH Vhys VOL Parameter Input low level voltage Input high level voltage Schmitt trigger voltage hysteresis 1) Output low level voltage 2) IIO=+5mA TA85C TA85C 0.7xVDD 1 Conditions Min Typ Max 0.3xVDD Unit V V 0.5 0.2 20 40 TBD 30 20 200 VDD=5V VDD=5V VDD=3V 1.0 1.2 0.4 0.5 80 IIO=+2mA TA85C TA85C V RON Pull-up equivalent resistor 3) 1) k s s ns tw(RSTL)out Generated reset pulse duration th(RSTL)in External reset pulse hold time tg(RSTL)in Filtered glitch duration 5) 4) Internal reset sources Figure 82. Typical Application with RESET pin 6)7)8) Recommended if LVD is disabled VDD VDD VDD RON ST72XXX USER EXTERNAL RESET CIRCUIT 5) 0.01F 4.7k INTERNAL Filter RESET 0.01F PULSE GENERATOR WATCHDOG LVD RESET Required if LVD is disabled Notes: 1. Data based on characterization results, not tested in production. 2. The IIO current sunk must always respect the absolute maximum rating specified in Section 13.2.2 and the sum of IIO (I/O ports and control pins) must not exceed IVSS. 3. The RON pull-up equivalent resistor is based on a resistive transistor. Specfied for voltages on RESET pin between VILmax and VDD 4. To guarantee the reset of the device, a minimum pulse has to be applied to the RESET pin. All short pulses applied on RESET pin with a duration below th(RSTL)in can be ignored. 5. The reset network protects the device against parasitic resets. 6. The output of the external reset circuit must have an open-drain output to drive the ST7 reset pad. Otherwise the device can be damaged when the ST7 generates an internal reset (LVD or watchdog). 7. Whatever the reset source is (internal or external), the user must ensure that the level on the RESET pin can go below the VIL max. level specified in section 13.9.1 on page 99. Otherwise the reset will not be taken into account internally. 8. Because the reset circuit is designed to allow the internal RESET to be output in the RESET pin, the user must ensure that the current sunk on the RESET pin (by an external pull-p for example) is less than the absolute maximum value specified for IINJ(RESET) in section 13.2.2 on page 79. 99/122 1 ST7LITE0, ST7SUPERLITE 13.10 COMMUNICATION INTERFACE CHARACTERISTICS 13.10.1 SPI - Serial Peripheral Interface Subject to general operating conditions for V DD, fOSC, and TA unless otherwise specified. Symbol fSCK 1/tc(SCK) tr(SCK) tf(SCK) tsu(SS) th(SS) tw(SCKH) tw(SCKL) tsu(MI) tsu(SI) th(MI) th(SI) ta(SO) tdis(SO) tv(SO) th(SO) tv(MO) th(MO) Parameter Master SPI clock frequency fCPU=8MHz Slave fCPU=8MHz SPI clock rise and fall time SS setup time SS hold time SCK high and low time Data input setup time Data input hold time Data output access time Data output disable time Data output valid time Data output hold time Data output valid time Data output hold time Slave Slave Master Slave Master Slave Master Slave Slave Slave Slave (after enable edge) Master (before capture edge) 0 0.25 0.25 tCPU Refer to I/O port characteristics for more details on the input/output alternate function characteristics (SS, SCK, MOSI, MISO). Conditions Min fCPU/128 0.0625 0 Max fCPU/42 MHz Unit fCPU/24 see I/O port pin description 120 120 100 90 100 100 100 100 0 120 240 120 ns Figure 83. SPI Slave Timing Diagram with CPHA=0 3) SS INPUT tsu(SS) SCK INPUT CPHA=0 CPOL=0 CPHA=0 CPOL=1 ta(SO) MISO OUTPUT tw(SCKH) tw(SCKL) tv(SO) th(SO) tr(SCK) tf(SCK) LSB OUT tc(SCK) th(SS) tdis(SO) see note 2 see note 2 MSB OUT BIT6 OUT tsu(SI) th(SI) MOSI INPUT MSB IN BIT1 IN LSB IN Notes: 1. Data based on design simulation and/or characterisation results, not tested in production. 2. When no communication is on-going the data output line of the SPI (MOSI in master mode, MISO in slave mode) has its alternate function capability released. In this case, the pin status depends on the I/O port configuration. 3. Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD. 100/122 1 ST7LITE0, ST7SUPERLITE COMMUNICATION INTERFACE CHARACTERISTICS (Cont'd) Figure 84. SPI Slave Timing Diagram with CPHA=11) SS INPUT tsu(SS) SCK INPUT CPHA=0 CPOL=0 CPHA=0 CPOL=1 ta(SO) tw(SCKH) tw(SCKL) tv(SO) th(SO) tr(SCK) tf(SCK) LSB OUT tc(SCK) th(SS) tdis(SO) MISO OUTPUT see note 2 HZ MSB OUT BIT6 OUT see note 2 tsu(SI) th(SI) MOSI INPUT MSB IN BIT1 IN LSB IN Figure 85. SPI Master Timing Diagram 1) SS INPUT tc(SCK) CPHA=0 CPOL=0 SCK INPUT CPHA=0 CPOL=1 CPHA=1 CPOL=0 CPHA=1 CPOL=1 tw(SCKH) tw(SCKL) tsu(MI) MISO INPUT tv(MO) th(MI) tr(SCK) tf(SCK) MSB IN BIT6 IN LSB IN th(MO) MOSI OUTPUT see note 2 MSB OUT BIT6 OUT LSB OUT see note 2 Notes: 1. Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD. 2. When no communication is on-going the data output line of the SPI (MOSI in master mode, MISO in slave mode) has its alternate function capability released. In this case, the pin status depends of the I/O port configuration. 101/122 1 ST7LITE0, ST7SUPERLITE 13.11 8-BIT ADC CHARACTERISTICS TA = -40C to 125C, unless otherwise specified Symbol fADC VAIN RAIN CADC tSTAB Parameter ADC clock frequency Conversion voltage range External input resistor Internal sample and hold capacitor Stabilization time after ADC enable Conversion time (tSAMPLE+tHOLD) Sample capacitor loading time Hold conversion time fCPU=8MHz, fADC=4MHz 4 8 VDD=5V 3 0 2) 3 VSS Conditions Min Typ Max 4 VDD 10 1) Unit MHz V k pF tCONV tSAMPLE tHOLD s 1/fADC Figure 86. RAIN max. vs fADC with CAIN=0pF3) 45 40 Figure 87. Recommended CAIN/R AIN values4) 1000 Cain 10 nF 4 MHz Max. R AIN (Kohm) 2 MHz 1 MHz 100 Max. R AIN (Kohm) 35 30 25 20 15 10 5 0 0 10 30 Cain 22 nF Cain 47 nF 10 1 0.1 70 0.01 0.1 1 10 CPARASITIC (pF) f AIN(KHz) Figure 88. Typical Application with ADC VDD VT 0.6V RAIN VAIN AINx 2k(max) 8-Bit A/D Conversion CADC 3pF CAIN VT 0.6V IL 1A ST72XXX Notes: 1. Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than 10k). Data based on characterization results, not tested in production. 2. The stabilization time of the AD converter is masked by the first tLOAD. The first conversion after the enable is then always valid. 3.CPARASITIC represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the pad capacitance (3pF). A high CPARASITIC value will downgrade conversion accuracy. To remedy this, fADC should be reduced. 4. This graph shows that depending on the input signal variation (fAIN), CAIN can be increased for stabilization and to allow the use of a larger serial resistor (RAIN). It is valid for all fADC frequencies 4MHz. 102/122 1 ST7LITE0, ST7SUPERLITE ADC CHARACTERISTICS (Cont'd) 13.11.0.1 General PCB Design Guidelines To obtain best results, some general design and layout rules should be followed when designing the application PCB to shield the noise-sensitive, analog physical interface from noise-generating CMOS logic signals. - Properly place components and route the signal traces on the PCB to shield the analog inputs. ADC Accuracy TA = -40C to 85C, unless otherwise specified Symbol ET EO EG ED EL ET EO EG ED EL Parameter Total unadjusted Offset error 2) Gain Error 2) 2) Analog signals paths should run over the analog ground plane and be as short as possible. Isolate analog signals from digital signals that may switch while the analog inputs are being sampled by the A/D converter. Do not toggle digital outputs on the same I/O port as the A/D input being converted. Conditions Typ 1 Max -0.5 / +1 Unit error 2) fCPU=4MHz, fADC=2MHz ,VDD=5.0V 1 1 2 -0.5 / 3.5 1) LSB Differential linearity error Integral linearity error 2) Total unadjusted error 2) Offset error 2) Gain Error 2) 11) fCPU=8MHz, fADC=4MHz ,VDD=5.0V 2) -2 / 0 11) 11) LSB Differential linearity error Integral linearity error 2) Notes: 1) Data based on characterization results over the whole temperature range, monitored in production. 2) Injecting negative current on any of the analog input pins significantly reduces the accuracy of any conversion being performed on any analog input. Analog pins can be protected against negative injection by adding a Schottky diode (pin to ground). Injecting negative current on digital input pins degrades ADC accuracy especially if performed on a pin close to the analog input pins. Any positive injection current within the limits specified for IINJ(PIN) and IINJ(PIN) in Section 13.8 does not affect the ADC accuracy. 103/122 ST7LITE0, ST7SUPERLITE ADC CHARACTERISTICS (Cont'd) Figure 89. ADC Accuracy Characteristics with Amplifier disabled Digital Result ADCDR 255 254 253 EG 1LSB IDEAL V -V DDA S SA = ---------------------------------------256 (2) ET (1) Example of an actual transfer curve (2) The ideal transfer curve (3) End point correlation line ET=Total Unadjusted Error: maximum deviation between the actual and the ideal transfer curves. EO=Offset Error: deviation between the first actual transition and the first ideal one. EG=Gain Error: deviation between the last ideal transition and the last actual one. ED=Differential Linearity Error: maximum deviation between actual steps and the ideal one. EL=Integral Linearity Error: maximum deviation between any actual transition and the end point correlation line. 7 6 5 4 3 2 1 (3) (1) EO EL ED 1 LSBIDEAL 0 1 VSSA Vin (LSBIDEAL) 2 3 4 5 6 7 253 254 255 256 VDDA 104/122 ST7LITE0, ST7SUPERLITE ADC CHARACTERISTICS (Cont'd) Figure 90. ADC Accuracy Characteristics with Amplifier enabled Digital Result ADCDR EG - VSSA DDA = ------------------------------------1LSB IDE AL 103 x 8 V (2) ET n+7 n+6 n+5 n+4 n+3 n+2 n+1 0 VSS 1 2 3 4 1 LSBIDEAL EO EL ED (3) (1) (1) Example of an actual transfer curve (2) The ideal transfer curve (3) End point correlation line ET=Total Unadjusted Error: maximum deviation between the actual and the ideal transfer curves. EO=Offset Error: deviation between the first actual transition and the first ideal one. EG=Gain Error: deviation between the last ideal transition and the last actual one. ED=Differential Linearity Error: maximum deviation between actual steps and the ideal one. EL=Integral Linearity Error: maximum deviation between any actual transition and the end point correlation line. n=Amplifier Offset Vin (LSBIDEAL) 5 6 7 100 101 102 103 250 mV Note: When the AMPSEL bit in the ADCDRL register is set, it is mandatory that fADC be less than or equal to 2 MHz. (if fCPU=8MHz. then SPEED=0, SLOW=1). Symbol VDD(AMP) VIN VOFFSET VSTEP Linearity Gain factor Vmax Vmin Parameter Amplifier operating voltage Amplifier input voltage Amplifier offset voltage Step size for monotonicity3) Output Voltage Response Amplified Analog input Gain 2) Conditions VDD=5V Min 4.5 0 Typ Max 5.5 250 Unit V mV mV mV 200 5 Linear 7 VINmax = 250mV, VDD=5V 1) 8 2.2 0.22 91) 2.4 0.25 V V Output Linearity Max Voltage Output Linearity Min Voltage 2.05 01) Notes: 1) Data based on characterization results over the whole temperature range, not tested in production. 2) For precise conversion results it is recommended to calibrate the amplifier at the following two points: - offset at VINmin = 0V - gain at full scale (for example VIN=250mV) 3) Monotonicity guaranteed if VIN increases or decreases in steps of min. 5mV. 105/122 ST7LITE0, ST7SUPERLITE 14 PACKAGE CHARACTERISTICS 14.1 PACKAGE MECHANICAL DATA Figure 91. 16-Pin Plastic Dual In-Line Package, 300-mil Width mm Min 0.38 2.92 0.36 1.14 0.76 0.20 0.13 2.54 7.62 6.10 2.92 Typ Max 5.33 0.015 3.30 4.95 0.115 0.130 0.195 0.46 0.56 0.014 0.018 0.022 1.52 1.78 0.045 0.060 0.070 0.99 1.14 0.030 0.039 0.045 0.25 0.36 0.008 0.010 0.014 0.005 0.100 7.87 8.26 0.300 0.310 0.325 6.35 7.11 0.240 0.250 0.280 3.30 3.81 0.115 0.130 0.150 10.92 Number of Pins N 16 0.430 Min inches Typ Max 0.210 Dim. E A A2 A1 A A1 A2 b c E1 L b2 b3 c D D1 e E E1 L eB b2 D1 b3 b e eB D 18.67 19.18 19.69 0.735 0.755 0.775 Figure 92. 16-Pin Plastic Small Outline Package, 150-mil Width L 45x Dim. A mm Min 1.35 0.10 0.33 0.19 9.80 3.80 1.27 5.80 0 0.40 6.20 0.228 8 0 1.27 0.016 Typ Max Min 1.75 0.053 0.25 0.004 0.51 0.013 0.25 0.007 10.00 0.386 4.00 0.150 inches Typ Max 0.069 0.010 0.020 0.010 0.394 0.157 0.050 0.244 8 0.050 A B A1 a H A1 C A1 B C D E e H e D 16 9 E L N 0016020 1 8 Number of Pins 16 106/122 ST7LITE0, ST7SUPERLITE 14.2 THERMAL CHARACTERISTICS Symbol RthJA PD TJmax Power dissipation 1) Ratings Package thermal resistance (junction to ambient) Maximum junction temperature 2) Value TBD 500 150 Unit C/W mW C Notes: 1. The power dissipation is obtained from the formula PD=PINT+PPORT where PINT is the chip internal power (IDDxVDD) and PPORT is the port power dissipation determined by the user. 2. The average chip-junction temperature can be obtained from the formula TJ = TA + PD x RthJA. 107/122 ST7LITE0, ST7SUPERLITE 14.3 SOLDERING AND GLUEABILITY INFORMATION Recommended soldering information given only as design guidelines. Figure 93. Recommended Wave Soldering Profile (with 37% Sn and 63% Pb) 250 200 150 Temp. [C] 100 50 0 20 40 60 80 100 120 140 160 PREHEATING PHASE Time [sec] 80C 5 sec SOLDERING PHASE COOLING PHASE (ROOM TEMPERATURE) Figure 94. Recommended Reflow Soldering Oven Profile (MID JEDEC) 250 200 150 Temp. [C] 100 50 0 100 200 300 400 ramp up 2C/sec for 50sec ramp down natural 2C/sec max 90 sec at 125C 150 sec above 183C Tmax=220+/-5C for 25 sec Time [sec] Recommended glue for SMD plastic packages: s Heraeus: PD945, PD955 s Loctite: 3615, 3298 108/122 ST7LITE0, ST7SUPERLITE 15 DEVICE CONFIGURATION AND ORDERING INFORMATION Each device is available for production in user programmable versions (FLASH) as well as in factory coded versions (FASTROM). ST7PLITE0x and ST7PLITES2/S5 devices are Factory Advanced Service Technique ROM (FASTROM) versions: they are factory-programmed XFlash devices. ST7FLITE0x and ST7FLITES2/S5 XFlash devices are shipped to customers with a default program memory content (FFh). The OSC option bit is programmed to 0 by default. The FASTROM factory coded parts contain the code supplied by the customer. This implies that FLASH devices have to be configured by the customer using the Option Bytes while the FASTROM devices are factory-configured. OPTION BYTE 0 Bit 7:4 = Reserved, must always be 1. Bit 3:2 = SEC[1:0] Sector 0 size definition These option bits indicate the size of sector 0 according to the following table. Sector 0 Size 0.5k 1k 1.5k 1) SEC1 0 0 1 SEC0 0 1 x 15.1 OPTION BYTES The two option bytes allow the hardware configuration of the microcontroller to be selected. The option bytes can be accessed only in programming mode (for example using a standard ST7 programming tool). Note 1: Configuration available for ST7LITE0 devices only. Bit 1 = FMP_R Read-out protection This option indicates if the FLASH program memory and Data EEPROM is protected against piracy. The read-out protection blocks access to the program and data areas in any mode except user mode and IAP mode. Erasing the option bytes when the FMP_R option is selected will cause the whole memory to be erased first, , and the device can be reprogrammed. Refer to Section 4.5 and the ST7 Flash Programming Reference Manual for more details. 0: Read-out protection off 1: Read-out protection on Bit 0 = FMP_W FLASH write protection This option indicates if the FLASH program memory is write protected. Warning: When this option is selected, the program memory (and the option bit itself) can never be erased or programmed again. 0: Write protection off 1: Write protection on 109/122 ST7LITE0, ST7SUPERLITE OPTION BYTES (Cont'd) OPTION BYTE 1 Bit 7 = PLLx4x8 PLL Factor selection. 0: PLLx4 1: PLLx8 Bit 6 = PLLOFF PLL disable. 0: PLL enabled 1: PLL disabled (by-passed) Table 20. List of valid option combinations VDD range Operating conditions Clock Source Internal RC 1% 2.4V - 3.3V External clock PLL off x4 x8 off x4 x8 off x4 x8 off x4 x8 Typ fCPU 0.7MHz @3V 2.8MHz @3V 0-4MHz 4MHz 1MHz @5V 8MHz @5V 0-8MHz 8 MHz OSC 0 0 1 1 0 0 1 1 Option Bits PLLOFF PLLx4x8 1 x 0 0 1 x 0 0 1 x 0 1 1 x 0 1 Bit 5 = Reserved, must always be 1. Bit 4 = OSC RC Oscillator selection 0: RC oscillator on 1: RC oscillator off Internal RC 1% 3.3V - 5.5V External clock Note 1: see Clock Management Block diagram in Figure 13 Bit 1 = WDG SW Hardware or software watchdog This option bit selects the watchdog type. Bit 3:2 = LVD[1:0] Low voltage detection selection 0: Hardware (watchdog always enabled) These option bits enable the LVD block with a se1: Software (watchdog to be enabled by software) lected threshold as shown in Table 21. Bit 0 = WDG HALT Watchdog Reset on Halt Table 21. LVD Threshold Configuration This option bit determines if a RESET is generated Configuration LVD1 LVD0 when entering HALT mode while the Watchdog is 1 1 active. LVD Off 0: No Reset generation when entering Halt mode 1 0 Highest Voltage Threshold (4.1V) 1: Reset generation when entering Halt mode Medium Voltage Threshold (3.5V) 0 0 1 0 OPTION BYTE 1 0 Reserved Default Value 1 1 1 1 7 0 WDG WDG OSC LVD1 LVD0 SW HALT 1 0 1 1 1 1 Lowest Voltage Threshold (2.8V) OPTION BYTE 0 7 FMP FMP PLL PLL SEC1 SEC0 R W x4x8 OFF 1 1 0 0 1 1 110/122 ST7LITE0, ST7SUPERLITE 15.2 DEVICE ORDERING INFORMATION AND TRANSFER OF CUSTOMER CODE Customer code is made up of the FASTROM contents and the list of the selected options (if any). The FASTROM contents are to be sent on diskette, or by electronic means, with the S19 hexadecimal file generated by the development tool. All unused bytes must be set to FFh. The selected options are communicated to STMicroelectronics using the correctly completed OPTION LIST appended. Refer to application note AN1635 for information on the counter listing returned by ST after code has been transferred. The STMicroelectronics Sales Organization will be pleased to provide detailed information on contractual points. Table 22. Supported part numbers Part Number ST7FLITES2Y0B6 ST7FLITES2Y0M6 ST7FLITES5Y0B6 ST7FLITES5Y0M6 ST7PLITES2Y0B6 ST7PLITES2Y0M6 ST7PLITES5Y0B6 ST7PLITES5Y0M6 ST7FLITE02Y0B6 ST7FLITE02Y0M6 ST7FLITE05Y0B6 ST7FLITE05Y0M6 ST7FLITE09Y0B6 ST7FLITE09Y0M6 ST7PLITE02Y0B6 ST7PLITE02Y0M6 ST7PLITE05Y0B6 ST7PLITE05Y0M6 ST7PLITE09Y0B6 ST7PLITE09Y0M6 1.5K FASTROM 1.5K FLASH 1K FASTROM 1K FLASH Program Memory (Bytes) Data EEPROM (Bytes) 128 128 128 128 128 128 128 128 RAM (Bytes) ADC yes 1) yes 1) yes yes yes yes yes 2) 2) 2) 1) Temp. Range Package DIP16 -40C +85C SO16 DIP16 SO16 DIP16 SO16 DIP16 SO16 DIP16 SO16 DIP16 SO16 DIP16 SO16 DIP16 SO16 DIP16 SO16 DIP16 SO16 -40C +85C yes 1) yes 2) 2) -40C +85C yes 2) -40C +85C yes 2) yes 2) Contact ST sales office for product availability Note 1: available without Operational Amplifier Note 2: available with Operational Amplifier 111/122 ST7LITE0, ST7SUPERLITE ST7LITE0 AND ST7SUPERLITE FASTROM MICROCONTROLLER OPTION LIST ................................................................... ................................................................... ................................................................... Contact ................................................................... Phone No ................................................................... Reference/FASTROM Code*: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . *FASTROM code name is assigned by STMicroelectronics. FASTROM code must be sent in .S19 format. .Hex extension cannot be processed. Device Type/Memory Size/Package (check only one option): --------------------------------- | ----------------------------------------- | ----------------------------------------1K 1.5K FASTROM DEVICE: --------------------------------- | ----------------------------------------- | ----------------------------------------PDIP16: | [ ] ST7PLITE02Y0B6 | [ ] ST7PLITES2Y0B6 | [ ] ST7PLITE05Y0B6 | [ ] ST7PLITES5Y0B6 | [ ] ST7PLITE09Y0B6 | SO16: | [ ] ST7PLITE02Y0M6 | [ ] ST7PLITES2Y0M6 | [ ] ST7PLITE05Y0M6 | [ ] ST7PLITES5Y0M6 | [ ] ST7PLITE09Y0M6 | Customer Address .... .... .... .... .... .... ... ... ... ... ... ... Warning: Addresses 1000h, 1001h, FFDEh and FFDFh are reserved areas for ST to program RCCR0 and RCCR1 (see section 7.1 on page 23). Conditioning (check only one option): --------------------------------------------------------------------------| - Packaged Product (do not specify for DIP package) --------------------------------------------------------------------------| [ ] Tape & Reel [ ] Tube | | | Special Marking: [ ] No [ ] Yes "_ _ _ _ _ _ _ _ _" (DIP16 only) Authorized characters are letters, digits, '.', '-', '/' and spaces only. Maximum character count: PDIP16 (9 char. max) : _ _ _ _ _ _ _ _ _ SO16 (6 char. max) : _ _ _ _ _ _ Sector 0 size: [ ] 0.5K [ ] 1K [ ] 1.5K (ST7LITE0 devices only) [ ] Disabled [ ] Disabled [ ] Internal RC [ ] Disabled [ ] Disabled [ ] Enabled [ ] Enabled [ ] External Clock [ ] PLLx4 [ ] PLLx8 Readout Protection: FLASH write Protection: Clock Source Selection: PLL LVD Reset [ ] Highest threshold [ ] Medium threshold [ ] Lowest threshold Watchdog Selection: Watchdog Reset on Halt: [ ] Software Activation [ ] Disabled [ ] Hardware Activation [ ] Enabled Comments : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supply Operating Range in the application: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Notes .......................................................................... Date: .......................................................................... Signature: .......................................................................... Important note: Not all configurations are available. See Table 20 on page 110 for authorized option byte combinations. 112/122 ST7LITE0, ST7SUPERLITE 15.3 DEVELOPMENT TOOLS STmicroelectronics offers a range of hardware and software development tools for the ST7 microcontroller family. Full details of tools available for the ST7 from third party manufacturers can be obtain from the STMicroelectronics Internet site: http//mcu.st.com. Tools from these manufacturers include C compliers, emulators and gang programmers. STMicroelectronics Tools Three types of development tool are offered by ST, all of them connect to a PC via a parallel (LPT) or USB port: see Table 23 and Table 24 for more details. Table 23. STMicroelectronics Tools Features In-Circuit Emulation ST7 In Circuit Debugging Kit ST7 Emulator Yes Yes, powerful emulation features including trace/ logic analyzer Programming Capability1) Yes (all packages) No Software Included ST7 CD ROM with: - ST7 Assembly toolchain - STVD7 powerful Source Level Debugger for Win 9x and NT - C compiler demo versions - ST Realizer for Win 3.1 and Win 95. - Windows Programming Tools for Win 9x and NT ST7 Programming Board No Yes (All packages) Table 24. Dedicated STMicroelectronics Development Tools Supported Products ST7FLITE02, ST7FLITE05, ST7FLITE09, ST7FLITES2, ST7FLITES5 ST7 In Circuit Debugging Kit ST7FLITE0-INDART (parallel port) ST7FLIT0-IND/USB (USB port) ST7 Emulator ST7 Programming Board ST7MDT10-EMU3 ST7MDT10-EPB Note: 1. In-Circuit Programming (ICP) interface for FLASH devices. 113/122 ST7LITE0, ST7SUPERLITE 15.4 ST7 APPLICATION NOTES IDENTIFICATION DESCRIPTION EXAMPLE DRIVERS AN 969 SCI COMMUNICATION BETWEEN ST7 AND PC AN 970 SPI COMMUNICATION BETWEEN ST7 AND EEPROM AN 971 IC COMMUNICATING BETWEEN ST7 AND M24CXX EEPROM AN 972 ST7 SOFTWARE SPI MASTER COMMUNICATION AN 973 SCI SOFTWARE COMMUNICATION WITH A PC USING ST72251 16-BIT TIMER AN 974 REAL TIME CLOCK WITH ST7 TIMER OUTPUT COMPARE AN 976 DRIVING A BUZZER THROUGH ST7 TIMER PWM FUNCTION AN 979 DRIVING AN ANALOG KEYBOARD WITH THE ST7 ADC AN 980 ST7 KEYPAD DECODING TECHNIQUES, IMPLEMENTING WAKE-UP ON KEYSTROKE AN1017 USING THE ST7 UNIVERSAL SERIAL BUS MICROCONTROLLER AN1041 USING ST7 PWM SIGNAL TO GENERATE ANALOG OUTPUT (SINUSOID) AN1042 ST7 ROUTINE FOR IC SLAVE MODE MANAGEMENT AN1044 MULTIPLE INTERRUPT SOURCES MANAGEMENT FOR ST7 MCUS AN1045 ST7 S/W IMPLEMENTATION OF IC BUS MASTER AN1046 UART EMULATION SOFTWARE AN1047 MANAGING RECEPTION ERRORS WITH THE ST7 SCI PERIPHERALS AN1048 ST7 SOFTWARE LCD DRIVER AN1078 PWM DUTY CYCLE SWITCH IMPLEMENTING TRUE 0% & 100% DUTY CYCLE AN1082 DESCRIPTION OF THE ST72141 MOTOR CONTROL PERIPHERAL REGISTERS AN1083 ST72141 BLDC MOTOR CONTROL SOFTWARE AND FLOWCHART EXAMPLE AN1105 ST7 PCAN PERIPHERAL DRIVER AN1129 PERMANENT MAGNET DC MOTOR DRIVE. AN INTRODUCTION TO SENSORLESS BRUSHLESS DC MOTOR DRIVE APPLICATIONS AN1130 WITH THE ST72141 AN1148 USING THE ST7263 FOR DESIGNING A USB MOUSE AN1149 HANDLING SUSPEND MODE ON A USB MOUSE AN1180 USING THE ST7263 KIT TO IMPLEMENT A USB GAME PAD AN1276 BLDC MOTOR START ROUTINE FOR THE ST72141 MICROCONTROLLER AN1321 USING THE ST72141 MOTOR CONTROL MCU IN SENSOR MODE AN1325 USING THE ST7 USB LOW-SPEED FIRMWARE V4.X AN1445 USING THE ST7 SPI TO EMULATE A 16-BIT SLAVE AN1475 DEVELOPING AN ST7265X MASS STORAGE APPLICATION AN1504 STARTING A PWM SIGNAL DIRECTLY AT HIGH LEVEL USING THE ST7 16-BIT TIMER PRODUCT EVALUATION AN 910 PERFORMANCE BENCHMARKING AN 990 ST7 BENEFITS VERSUS INDUSTRY STANDARD AN1077 OVERVIEW OF ENHANCED CAN CONTROLLERS FOR ST7 AND ST9 MCUS AN1086 U435 CAN-DO SOLUTIONS FOR CAR MULTIPLEXING AN1150 BENCHMARK ST72 VS PC16 AN1151 PERFORMANCE COMPARISON BETWEEN ST72254 & PC16F876 AN1278 LIN (LOCAL INTERCONNECT NETWORK) SOLUTIONS PRODUCT MIGRATION AN1131 MIGRATING APPLICATIONS FROM ST72511/311/214/124 TO ST72521/321/324 AN1322 MIGRATING AN APPLICATION FROM ST7263 REV.B TO ST7263B AN1365 GUIDELINES FOR MIGRATING ST72C254 APPLICATION TO ST72F264 PRODUCT OPTIMIZATION 114/122 ST7LITE0, ST7SUPERLITE DESCRIPTION USING ST7 WITH CERAMIC RESONATOR HOW TO MINIMIZE THE ST7 POWER CONSUMPTION SOFTWARE TECHNIQUES FOR IMPROVING MICROCONTROLLER EMC PERFORMANCE MONITORING THE VBUS SIGNAL FOR USB SELF-POWERED DEVICES ST7 CHECKSUM SELF-CHECKING CAPABILITY CALIBRATING THE RC OSCILLATOR OF THE ST7FLITE0 MCU USING THE MAINS EMULATED DATA EEPROM WITH XFLASH MEMORY EMULATED DATA EEPROM WITH ST7 HDFLASH MEMORY EXTENDING THE CURRENT & VOLTAGE CAPABILITY ON THE ST7265 VDDF SUPPLY ACCURATE TIMEBASE FOR LOW-COST ST7 APPLICATIONS WITH INTERNAL RC OSCILAN1530 LATOR PROGRAMMING AND TOOLS AN 978 KEY FEATURES OF THE STVD7 ST7 VISUAL DEBUG PACKAGE AN 983 KEY FEATURES OF THE COSMIC ST7 C-COMPILER PACKAGE AN 985 EXECUTING CODE IN ST7 RAM AN 986 USING THE INDIRECT ADDRESSING MODE WITH ST7 AN 987 ST7 SERIAL TEST CONTROLLER PROGRAMMING AN 988 STARTING WITH ST7 ASSEMBLY TOOL CHAIN AN 989 GETTING STARTED WITH THE ST7 HIWARE C TOOLCHAIN AN1039 ST7 MATH UTILITY ROUTINES AN1064 WRITING OPTIMIZED HIWARE C LANGUAGE FOR ST7 AN1071 HALF DUPLEX USB-TO-SERIAL BRIDGE USING THE ST72611 USB MICROCONTROLLER AN1106 TRANSLATING ASSEMBLY CODE FROM HC05 TO ST7 PROGRAMMING ST7 FLASH MICROCONTROLLERS IN REMOTE ISP MODE (IN-SITU PROAN1179 GRAMMING) AN1446 USING THE ST72521 EMULATOR TO DEBUG A ST72324 TARGET APPLICATION AN1478 PORTING AN ST7 PANTA PROJECT TO CODEWARRIOR IDE AN1527 DEVELOPING A USB SMARTCARD READER WITH ST7SCR AN1575 ON-BOARD PROGRAMMING METHODS FOR XFLASH AND HDFLASH ST7 MCUS IDENTIFICATION AN 982 AN1014 AN1015 AN1040 AN1070 AN1324 AN1477 AN1502 AN1529 115/122 ST7LITE0, ST7SUPERLITE 16 IMPORTANT NOTES 16.1 Execution of BTJX Instruction Description Executing a BTJx instruction jumps to a random address in the following conditions: the jump goes to a lower address (jump backward) and the test is performed on a data located at the address 00FFh. 16.2 In-Circuit Programming of devices previously programmed with Hardware Watchdog option Description Workaround Devices configured with Hardware Watchdog must be programmed using a specific programming mode that ignores the option byte settings. In this mode, an external clock, normally provided by the programming tool, has to be used. In ST tools, this mode is called "ICP OPTIONS DISABLED". Socke ts on ST p ro gramming tools (such as ST7MDT10-EPB) are controlled using "ICP OPTIONS DISABLED" mode. Devices can therefore be reprogrammed by plugging them in the ST Programming Board socket, whatever the watchdog configuration. When using third-party tools, please refer the manufacturer's documentation to check how to access specific programming modes. If a tool does not have a mode that ignores the option byte settings, devices programmed with the Hardware watchdog option cannot be reprogrammed using this tool. 16.3 In-Circuit Watchdog Debugging with Hardware In-Circuit Programming of devices configured with Hardware Watchdog (WDGSW bit in option byte 1 programmed to 0) requires certain precautions (see below). In-Circuit Programming uses ICC mode. In this mode, the Hardware Watchdog is not automatically deactivated as one might expect. As a consequence, internal resets are generated every 2 ms by the watchdog, thus preventing programming. The device factory configuration is Software Watchdog so this issue is not seen with devices that are programmed for the first time. For the same reason, devices programmed by the user with the Software Watchdog option are not impacted. The only devices impacted are those that have previously been programmed with the Hardware Watchdog option. In Circuit Debugging is impacted in the same way as In Circuit Programming by the activation of the hardware watchdog in ICC mode. Please refer to Section 16.2. 116/122 ST7LITE0, ST7SUPERLITE 17 SUMMARY OF CHANGES Revision Main changes Added ST7LITE02x devices and ST7SUPERLITE devices Changed Caution to pin n10 in Table 1, "Device Pin Description," on page 7 Changed note 5 in section 4.4 on page 13 Changed section 4.5.1 on page 14 Changed section 11.4.6 on page 70: added note in the description of ADON Bit (ADCCSR register) and modified description of AMPSEL bit in the ADCAMP register Changed section 13.3.1 on page 80: fCLKIN instead of fOSC Changed note 2 in section 13.3.4.2 on page 83 Changed section 13.7.1 on page 90 Updated section 13.7.2.2 on page 92 ("Electrical Sensitivities" table) Changed section 15 on page 109 Changed section 15.2 on page 111 Changed Table 24, "Dedicated STMicroelectronics Development Tools," on page 113 Changed option list on page 112 Date 2.4 August-03 117/122 ERRATA SHEET ST7LITE0, ST7SUPERLITE LIMITATIONS AND CORRECTIONS 18 SILICON IDENTIFICATION This section of the document refers to rev Y ST7FLITE0 and ST7FLITES2/S5 devices. They are identifiable: s s On the device package, by the last letter of the Trace code marked on the device package On the box, by the last 3 digits of the Internal Sales Type printed on the box label. Table 25. Device Identification Trace Code marked on device Internal Sales Type on box label 7FLITE09Y0M6$U5 7FLITE09Y0B6$U5 7FLITE05Y0M6$U5 7FLITE05Y0B6$U5 7FLITE02Y0M6$U5 7FLITE02Y0B6$U5 7FLITES5Y0M6$U5 7FLITES5Y0B6$U5 7FLITES2Y0M6$U5 7FLITES2Y0B6$U5 Flash Devices: "xxxxxxxxxY" See also Figure 95 19 REFERENCE SPECIFICATION Limitations in this document are with reference to the ST7LITE0, ST7SUPERLITE Datasheet Revision 2.4 (August 2003). 20 SILICON LIMITATIONS 20.1 NEGATIVE INJECTION IMPACT ON ADC ACCURACY Injecting a negative current on an analog input pins significantly reduces the accuracy of the AD Converter. Whenever necessary, the negative injection should be prevented by the addition of a Schottky diode between the concerned I/Os and ground. Injecting a negative current on digital input pins degrades ADC accuracy especially if performed on a pin close to ADC channel in use. Rev. 2.5 August 2003 118/122 ERRATA SHEET 20.2 ADC CONVERSION SPURIOUS RESULTS Spurious conversions occur with a rate lower than 50 per million. Such conversions happen when the measured voltage is just between 2 consecutive digital values. Workaround A software filter should be implemented to remove erratic conversion results whenever they may cause unwanted consequences. 20.3 FUNCTIONAL ESD SENSITIVITY The ST7LITE0 and ST7SUPERLITE, when configured with High or Medium LVD threshold, are below the STMicroelectronics functional sensitivity standard. When positive stress is injected on I/Os, the LVD reset is activated, but normal operation resumes after reset. As a consequence, the application should be well protected against ESD. The firmware may also be designed to allow warm reset, as described in EMC application note AN1015, allowing the application to resume normal operation after a reset. This does not affect ESD absolute maximum ratings: the ST7LITE0 and ST7SUPERLITE meet STMicroelectronics standards concerning ESD levels that may cause damage to the silicon. Devices configured without LVD and with the Low LVD threshold level are not impacted. 119/122 ERRATA SHEET 21 DEVICE MARKING Figure 95. Revision Marking on Box Label and Device Marking TYPE xxxx Internalxxx$xx Trace Code LAST 2 DIGITS AFTER $ IN INTERNAL SALES TYPE ON BOX LABEL INDICATE SILICON REV. LAST LETTER OF TRACE CODE ON DEVICE INDICATES SILICON REV. 120/122 ERRATA SHEET 22 ERRATA SHEET REVISION HISTORY Revision Main Changes Date 2.5 This revision refers to the ST7LITE0, ST7SUPERLITE datasheet revision 2.4. August 2003 121/122 ERRATA SHEET Notes: Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without the express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c)2003 STMicroelectronics - All Rights Reserved. Purchase of I2C Components by STMicroelectronics conveys a license under the Philips I2C Patent. Rights to use these components in an I2C system is granted provided that the system conforms to the I 2C Standard Specification as defined by Philips. STMicroelectronics Group of Companies Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com 122/122 |
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