ST7L34 ST7L35 ST7L38 ST7L39 8-bit MCU for automotive with single voltage Flash/ROM, data EEPROM, ADC, timers, SPI, LINSCITM Features Memories - 8 Kbytes program memory: Single voltage extended Flash (XFlash) or ROM with readout protection capability. In-application programming and in-circuit programming (IAP and ICP) for XFlash devices - 384 bytes RAM - 256 bytes data EEPROM (XFlash and ROM devices) with readout protection, 300 K write/erase cycles guaranteed - XFlash and EEPROM data retention 20 years at 55C Clock, reset and supply management - Enhanced reset system - Enhanced low voltage supervisor (LVD) for main supply and an auxiliary voltage detector (AVD) with interrupt capability for implementing safe power-down procedures - Clock sources: Internal 1% RC oscillator, crystal/ceramic resonator or external clock - Optional x8 PLL for 8 MHz internal clock - 5 power saving modes: Halt, active halt, auto wakeup from halt, wait and slow I/O ports - Up to 15 multifunctional bidirectional I/O lines - 7 high sink outputs 5 timers - Configurable watchdog timer - Two 8-bit lite timers with prescaler, 1 realtime base and 1 input capture - Two 12-bit autoreload timers with 4 PWM outputs, 1 input capture and 4 output compare functions November 2011 SO20 300 mil QFN20 2 communication interfaces - Master/slave LINSCITM asynchronous serial interface - SPI synchronous serial interface Interrupt management - 10 interrupt vectors plus TRAP and reset - 12 external interrupt lines (on 4 vectors) A/D converter - 7 input channels - 10-bit resolution Instruction set - 8-bit data manipulation - 63 basic instructions with illegal opcode detection - 17 main addressing modes - 8 x 8 unsigned multiply instructions Development tools - Full hardware/software development package - DM (debug module) Doc ID 11928 Rev 8 1/234 www.st.com 1 Contents ST7L34 ST7L35 ST7L38 ST7L39 Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 1.1 Parametric data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 1.2 Debug module (DM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3 Register and memory map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4 Flash program memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5 6 2/234 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.2 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.3 Programming modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.3.1 In-circuit programming (ICP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.3.2 In-application programming (IAP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.4 ICC interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.5 Memory protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.5.1 Readout protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.5.2 Flash write/erase protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.6 Related documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.7 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Data EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.2 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.3 Memory access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.4 Power saving modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.5 Access error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.6 Data EEPROM readout protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.7 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Central processing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6.2 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 6.3 7 7.1 Internal RC oscillator adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 7.2 Phase locked loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 7.3 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 7.4 Multi-oscillator (MO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 7.6 9 CPU registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Supply, reset and clock management . . . . . . . . . . . . . . . . . . . . . . . . . . 37 7.5 8 Contents 7.4.1 External clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 7.4.2 Crystal/ceramic oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 7.4.3 Internal RC oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Reset sequence manager (RSM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 7.5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 7.5.2 Asynchronous external RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.5.3 External power-on reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7.5.4 Internal low voltage detector (LVD) reset . . . . . . . . . . . . . . . . . . . . . . . . 44 7.5.5 Internal watchdog reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 System integrity management (SI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.6.1 Low voltage detector (LVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.6.2 Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 7.6.3 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 7.6.4 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 8.1 Non maskable software interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 8.2 External interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.3 Peripheral interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Power saving modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 9.2 Slow mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 9.3 Wait mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.4 Halt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 9.4.1 Halt mode recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 9.5 Active halt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 9.6 Auto wakeup from halt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Doc ID 11928 Rev 8 3/234 Contents 10 11 ST7L34 ST7L35 ST7L38 ST7L39 I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 10.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 10.2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Input modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 10.2.2 Output modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 10.2.3 Alternate functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 10.3 I/O port implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 10.4 Unused I/O pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 10.5 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 10.6 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 10.7 Device-specific I/O port configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 On-chip peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 11.1 11.2 11.3 11.4 4/234 10.2.1 Watchdog timer (WDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 11.1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 11.1.2 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 11.1.3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 11.1.4 Hardware watchdog option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 11.1.5 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 11.1.6 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Dual 12-bit autoreload timer 3 (AT3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 11.2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 11.2.2 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 11.2.3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 11.2.4 Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 11.2.5 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 11.2.6 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 Lite timer 2 (LT2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 11.3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 11.3.2 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 11.3.3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 11.3.4 Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 11.3.5 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Serial peripheral interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 11.4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 11.4.2 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 11.5 Contents 11.4.3 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 11.4.4 Clock phase and clock polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 11.4.5 Error flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 11.4.6 Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 11.4.7 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 11.4.8 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 LINSCI serial communication interface (LIN master/slave) . . . . . . . . . . 122 11.5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 11.5.2 SCI features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 11.5.3 LIN features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 11.5.4 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 11.5.5 SCI mode - functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 11.5.6 Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 11.5.7 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 11.5.8 SCI mode registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 11.5.9 LIN mode - functional description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 11.5.10 LIN mode register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 11.6 12 10-bit A/D converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 11.6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 11.6.2 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 11.6.3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 11.6.4 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 11.6.5 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 11.6.6 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 Instruction set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 12.1 12.2 ST7 addressing modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 12.1.1 Inherent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 12.1.2 Immediate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 12.1.3 Direct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 12.1.4 Indexed (no offset, short, long) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 12.1.5 Indirect (short, long) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 12.1.6 Indirect indexed (short, long) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 12.1.7 Relative mode (direct, indirect) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 Instruction groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 12.2.1 Using a prebyte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 12.2.2 Illegal opcode reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 Doc ID 11928 Rev 8 5/234 Contents 13 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 13.1 13.2 13.3 13.4 13.5 13.6 13.7 13.8 13.9 Parameter conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 13.1.1 Minimum and maximum values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 13.1.2 Typical values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 13.1.3 Typical curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 13.1.4 Loading capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 13.1.5 Pin input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179 13.2.1 Voltage characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 13.2.2 Current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 13.2.3 Thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 13.3.1 General operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 13.3.2 Operating conditions with low voltage detector (LVD) . . . . . . . . . . . . . 186 13.3.3 Auxiliary voltage detector (AVD) thresholds . . . . . . . . . . . . . . . . . . . . . 188 13.3.4 Internal RC oscillator and PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Supply current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189 13.4.1 Supply current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189 13.4.2 On-chip peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192 Clock and timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193 13.5.1 General timings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193 13.5.2 Crystal and ceramic resonator oscillators . . . . . . . . . . . . . . . . . . . . . . 194 Memory characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 13.6.1 RAM and hardware registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 13.6.2 Flash program memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 13.6.3 EEPROM data memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 Electromagnetic compatibility (EMC) characteristics . . . . . . . . . . . . . . . 196 13.7.1 Functional electromagnetic susceptibility (EMS) . . . . . . . . . . . . . . . . . 196 13.7.2 Electromagnetic interference (EMI) . . . . . . . . . . . . . . . . . . . . . . . . . . . 197 13.7.3 Absolute maximum ratings (electrical sensitivity) . . . . . . . . . . . . . . . . 198 I/O port pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199 13.8.1 General characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199 13.8.2 Output driving current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 Control pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 13.9.1 Asynchronous RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 13.10 Communication interface characteristics . . . . . . . . . . . . . . . . . . . . . . . . 207 6/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Contents 13.10.1 Serial peripheral interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207 13.11 10-bit ADC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 14 15 16 Package characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212 14.1 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212 14.2 Packaging for automatic handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214 14.3 Thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214 Device configuration and ordering information . . . . . . . . . . . . . . . . . 215 15.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215 15.2 Option bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215 15.2.1 Flash option bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216 15.2.2 ROM option bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217 15.3 Device ordering information and transfer of customer code . . . . . . . . . . 219 15.4 Development tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 15.4.1 Starter Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 15.4.2 Development and debugging tools . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 15.4.3 Programming tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 15.4.4 Order codes for development and programming tools . . . . . . . . . . . . . 225 Important notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226 16.1 Clearing active interrupts outside interrupt routine . . . . . . . . . . . . . . . . . 226 16.2 LINSCI limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226 16.2.1 17 Header time-out does not prevent wake-up from mute mode . . . . . . . 226 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228 Doc ID 11928 Rev 8 7/234 List of tables ST7L34 ST7L35 ST7L38 ST7L39 List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Table 17. Table 18. Table 19. Table 20. Table 21. Table 22. Table 23. Table 24. Table 25. Table 26. Table 27. Table 28. Table 29. Table 30. Table 31. Table 32. Table 33. Table 34. Table 35. Table 36. Table 37. Table 38. Table 39. Table 40. Table 41. Table 42. Table 43. Table 44. Table 45. Table 46. Table 47. Table 48. 8/234 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Device pin description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Hardware register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 EECSR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Data EEPROM register map and reset values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 CC register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 RCCR calibration registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 MCCSR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 RCCR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Clock cycle delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Effect of low power modes on system integrity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Supply, reset and clock management interrupt control/wake-up capability . . . . . . . . . . . . 47 SICSR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Interrupt mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 EICR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Interrupt sensitivity bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 EISR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 LTCSR/ATCSR register status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 AWUCSR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 AWUPR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 AWUPR dividing factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 AWU register map and reset values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 DR value and output pin status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 I/O port mode options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 I/O configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Effect of low power modes on I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 I/O interrupt control/wake-up capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Port configuration (standard ports) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Port configuration (external interrupts) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 I/O port register map and reset values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Watchdog timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 WDGCR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Watchdog timer register map and reset values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Effect of low power modes on AT3 timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 AT3 interrupt control/wake-up capability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 ATCSR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 CNTR1H and CNTR1L register descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 ATR1H and ATR1L register descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 PWMCR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 PWMxCSR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 BREAKCR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 DCRxH and DCRxL register descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 ATICRH and ATICRL register descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 ATCSR2 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 ATR2H and ATR2L register descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 DTGR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Register map and reset values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Effect of low power modes on lite timer 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 49. Table 50. Table 51. Table 52. Table 53. Table 54. Table 55. Table 56. Table 57. Table 58. Table 59. Table 60. Table 61. Table 62. Table 63. Table 64. Table 65. Table 66. Table 67. Table 68. Table 69. Table 70. Table 71. Table 72. Table 73. Table 74. Table 75. Table 76. Table 77. Table 78. Table 79. Table 80. Table 81. Table 82. Table 83. Table 84. Table 85. Table 86. Table 87. Table 88. Table 89. Table 90. Table 91. Table 92. Table 93. Table 94. Table 95. Table 96. Table 97. Table 98. Table 99. Table 100. List of tables Lite timer 2 interrupt control/wake-up capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 LTCSR2 register description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 LTARR register description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 LTCNTR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 LTCSR1 register description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 LTICR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Lite timer register map and reset values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Effect of low power modes on SPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 SPI interrupt control/wake-up capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 SPICR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 SPICSR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 SPI register map and reset values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Character formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 Effect of low power modes on SCI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 SCI interrupt control/wake-up capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 SCISR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 SCICR1 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 SCICR2 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 SCIBRR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 SCIERPR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 SCIETPR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 SCISR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 SCICR1 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 SCICR2 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 SCICR3 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 LPR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 LIN mantissa rounded values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 LPFR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 LDIV fractions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 LHLR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 LIN header mantissa values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 LIN header fractions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 LINSCI1 register map and reset values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 Effect of low power modes on the A/D converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 ADCCSR register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 ADCDRH register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 ADCDRL register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 ADC clock configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 ADC register map and reset values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 CPU addressing mode groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 CPU addressing mode overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 Inherent instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Immediate instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Instructions supporting direct, indexed, indirect and indirect indexed addressing modes 173 Short instructions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 Relative mode instructions (direct and indirect) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 Instruction groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 Instruction set overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176 Voltage characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 Current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181 General operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 Doc ID 11928 Rev 8 9/234 List of tables Table 101. Table 102. Table 103. Table 104. Table 105. Table 106. Table 107. Table 108. Table 109. Table 110. Table 111. Table 112. Table 113. Table 114. Table 115. Table 116. Table 117. Table 118. Table 119. Table 120. Table 121. Table 122. Table 123. Table 124. Table 125. Table 126. Table 127. Table 128. Table 129. Table 130. Table 131. Table 132. Table 133. Table 134. Table 135. Table 136. 10/234 ST7L34 ST7L35 ST7L38 ST7L39 Operating conditions (tested for TA = -40 to +125 C) @ VDD = 4.5 to 5.5 V . . . . . . . . . . 183 Operating conditions (tested for TA = -40 to +125 C) @ VDD = 4.5 to 5.5 V . . . . . . . . . . 183 Operating conditions (tested for TA = -40 to +125 C) @ VDD = 3.0 to 3.6 V . . . . . . . . . . 184 Operating conditions (tested for TA = -40 to +125 C) @ VDD = 3.0 to 3.6 V . . . . . . . . . . 185 Operating conditions with low voltage detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 Auxiliary voltage detector (AVD) thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Internal RC oscillator and PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 Supply current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189 On-chip peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192 General timings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193 Oscillator parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194 Typical ceramic resonator characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194 RAM and hardware registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 Characteristics of dual voltage HDFlash memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 Characteristics of EEPROM data memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 Electromagnetic test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197 EMI emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197 ESD absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 Latch up results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 I/O general port pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199 Output driving current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 Asynchronous RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 SPI characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207 10-bit ADC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 ADC accuracy with 4.5 V < VDD < 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 ADC accuracy with 3 V < VDD < 3.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211 20-pin plastic small outline package, 300-mil width, mechanical data . . . . . . . . . . . . . . . 212 QFN 5x6: 20-terminal very thin fine pitch quad flat no-lead package . . . . . . . . . . . . . . . . 213 Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214 Flash and ROM option bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215 Option byte 0 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216 Option byte 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217 Option byte 0 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217 Option byte 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218 ST7L3 development and programming tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Figure 23. Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. Figure 29. Figure 30. Figure 31. Figure 32. Figure 33. Figure 34. Figure 35. Figure 36. Figure 37. Figure 38. Figure 39. Figure 40. Figure 41. Figure 42. Figure 43. Figure 44. Figure 45. Figure 46. Figure 47. Figure 48. General block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 20-pin SO package pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 20-pin QFN package pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Memory map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Typical ICC interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 EEPROM block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Data EEPROM programming flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Data EEPROM write operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Data EEPROM programming cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 CPU registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Stack manipulation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 PLL output frequency timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Clock management block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 ST7 clock sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Reset sequence phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Reset block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Reset sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Low voltage detector vs. reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Reset and supply management block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Using the AVD to monitor VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Interrupt processing flowchart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Power saving mode transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Slow mode clock transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Wait mode flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Halt timing overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Halt mode flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Active halt timing overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Active halt mode flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 AWUFH mode block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 AWUF halt timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 AWUFH mode flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 I/O port general block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Interrupt I/O port state transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Watchdog block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Single timer mode (ENCNTR2 = 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Dual timer mode (ENCNTR2 = 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 PWM polarity inversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 PWM function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 PWM signal from 0% to 100%duty cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Dead time generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Block diagram of break function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 Block diagram of output compare mode (single timer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Block diagram of input capture mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Input capture timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Long range input capture block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 Long range input capture timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Lite timer 2 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 Input capture timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Doc ID 11928 Rev 8 11/234 List of figures Figure 49. Figure 50. Figure 51. Figure 52. Figure 53. Figure 54. Figure 55. Figure 56. Figure 57. Figure 58. Figure 59. Figure 60. Figure 61. Figure 62. Figure 63. Figure 64. Figure 65. Figure 66. Figure 67. Figure 68. Figure 69. Figure 70. Figure 71. Figure 72. Figure 73. Figure 74. Figure 75. Figure 76. Figure 77. Figure 78. Figure 79. Figure 80. Figure 81. Figure 82. Figure 83. Figure 84. Figure 85. Figure 86. Figure 87. Figure 88. Figure 89. Figure 90. Figure 91. Figure 92. Figure 93. Figure 94. Figure 95. Figure 96. Figure 97. Figure 98. Figure 99. Figure 100. 12/234 ST7L34 ST7L35 ST7L38 ST7L39 Serial peripheral interface block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 Single master/single slave application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 Generic SS timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 Hardware/software slave select management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 Data clock timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Clearing the WCOL bit (write collision flag) software sequence . . . . . . . . . . . . . . . . . . . . 116 Single master/multiple slave configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 SCI block diagram (in conventional baud rate generator mode). . . . . . . . . . . . . . . . . . . . 125 Word length programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 SCI baud rate and extended prescaler block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 LIN characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 SCI block diagram in LIN slave mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 LIN header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 LIN identifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 LIN header reception timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 LIN synch field measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 LDIV read/write operations when LDUM = 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 LDIV read/write operations when LDUM = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Bit sampling in reception mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 LSF bit set and clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 ADC block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 Pin loading conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 Pin input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179 fCLKIN maximum operating frequency vs VDD supply voltage . . . . . . . . . . . . . . . . . . . . . . 182 Typical accuracy with RCCR = RCCR0 vs. VDD = 4.5 to 5.5 V and temperature. . . . . . . 184 fRC vs. VDD and temperature for calibrated RCCR0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184 Typical accuracy with RCCR = RCCR1 vs. VDD = 3 to 3.6 V and temperature. . . . . . . . 185 fRC vs. VDD and temperature for calibrated RCCR1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 PLL x 8 output vs. CLKIN frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 Typical IDD in run mode vs. fCPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 Typical IDD in slow mode vs. fCPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 Typical IDD in wait mode vs. fCPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 Typical IDD in slow-wait mode vs. fCPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191 Typical IDD vs. temperature at VDD = 5 V and fCLKIN = 16 MHz . . . . . . . . . . . . . . . . . . . . 191 Typical IDD vs. temperature and VDD at fCLKIN = 16 MHz . . . . . . . . . . . . . . . . . . . . . . . . . 191 Two typical applications with unused I/O pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199 Typical IPU vs. VDD with VIN = VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 Typical VOL at VDD = 3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 Typical VOL at VDD = 4 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 Typical VOL at VDD = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 Typical VOL at VDD = 3 V (high-sink) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Typical VOL at VDD = 4 V (high-sink) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Typical VOL at VDD = 5 V (high-sink) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Typical VDD - VOH at VDD = 3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 Typical VDD - VOH at VDD = 4 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 Typical VDD - VOH at VDD = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 Typical VOL vs. VDD (standard I/Os) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 Typical VDD - VOH vs. VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 RESET pin protection when LVD is disabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 RESET pin protection when LVD Is enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 SPI slave timing diagram with CPHA = 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 SPI slave timing diagram with CPHA = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Figure 101. Figure 102. Figure 103. Figure 104. Figure 105. Figure 106. Figure 107. Figure 108. Figure 109. Figure 110. Figure 111. List of figures SPI master timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209 Typical application with ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 ADC accuracy characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211 20-pin plastic small outline package, 300-mil width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212 QFN 5x6, 20-terminal very thin fine pitch quad flat no-lead package . . . . . . . . . . . . . . . . 213 pin 1 orientation in tape and reel conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214 ST7FL3x Flash commercial product structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 ST7FL3x FASTROM commercial product structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221 ROM commercial product code structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222 Header reception event sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227 LINSCI interrupt routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227 Doc ID 11928 Rev 8 13/234 Description 1 ST7L34 ST7L35 ST7L38 ST7L39 Description The ST7L3x is a member of the ST7 microcontroller family suitable for automotive applications. All ST7 devices are based on a common industry-standard 8-bit core, featuring an enhanced instruction set. The ST7L3x features Flash memory with byte-by-byte in-circuit programming (ICP) and inapplication programming (IAP) capability. Under software control, the ST7L3x 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. Table 1. Device summary Feature ST7L34 ST7L35 Program memory 384 bytes (128 bytes) Data EEPROM Lite timer, autoreload timer, SPI, 10-bit ADC 256 bytes Lite timer, autoreload timer, SPI, 10-bit ADC, LINSCI Operating supply CPU frequency Lite timer, Lite timer, autoreload timer, autoreload timer, SPI, 10-bit ADC, SPI, 10-bit ADC LINSCI 3.0 V to 5.5 V Up to 8 MHz (with external resonator/clock or internal RC oscillator) Operating temperature Packages 1.1 ST7L39 8 Kbytes RAM (stack) Peripherals ST7L38 Up to -40 to 85C / -40 to 125C SO20 300mil, QFN20 Parametric data For easy reference, all parametric data is located in Section 13: Electrical characteristics. 1.2 Debug module (DM) The devices feature an on-chip debug module (DM) to support in-circuit debugging (ICD). For a description of the DM registers, refer to the ST7 ICC protocol reference manual. 14/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Figure 1. Description General block diagram Int. 1% RC 1 MHz 12-bit autoreload timer 3 PLL x8 CLKIN 8-bit lite timer 2 /2 OSC1 OSC2 Ext. osc 1 MHz to 16 MHz Internal clock Port A Port B VDD VSS RESET Power supply Control 8-bit core ALU Program memory (8 Kbytes) Address and data bus LVD PA7:0 (8 bits) PB6:0 (7 bits) ADC Debug module SPI LINSCI Watchdog RAM (384 bytes) Doc ID 11928 Rev 8 Data EEPROM (128 bytes) 15/234 Pin description 2 ST7L34 ST7L35 ST7L38 ST7L39 Pin description Figure 2. 20-pin SO package pinout VSS VDD RESET SS/AIN0/PB0 20 OSC1/CLKIN 2 19 OSC2 3 18 PA0 (HS)/LTIC) 4 17 PA1 (HS)/ATIC 16 PA2 (HS)/ATPWM0 1 SCK/AIN1/PB1 5 MISO/AIN2/PB2 6 MOSI/AIN3/PB3 7 CLKIN/AIN4/PB4 8 AIN5/PB5 9 RDI/AIN6/PB6 ei3 ei0 ei2 ei1 10 ei2 15 PA3 (HS)/ATPWM1 14 PA4 (HS)/ATPWM2 13 PA5 (HS)/ATPWM3/ICCDATA 12 PA6/MCO/ICCCLK/BREAK 11 PA7 (HS)/TDO 1. eix: Associated external interrupt vector 2. (HS): 20mA high sink capability Figure 3. 20-pin QFN package pinout VDD OSC1/CLKIN 18 19 20 VSS 17 OSC2 RESET 1 16 PA0 (HS)/LTIC SS/AIN0/PB0 2 15 PA1 (HS)/ATIC SCK/AIN1/PB1 3 MISO/AIN2/PB2 4 MOSI/AIN3/PB3 5 ei0 ei3 eix (HS) associated 20mA external high sinkinterrupt capability vector 14 PA2 (HS)/ATPWM0 13 PA3 (HS)/ATPWM1 12 PA4 (HS)/ATPWM2 ei2 ei1 CLKIN/AIN4/PB4 6 11 PA5 (HS)/ATPWM3/ICCDATA ei2 RDI/AIN6/PB6 7 AIN5/PB5 16/234 8 9 10 PA7(HS)/TDO PA6/MCO/ICCCLK/BREAK Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Pin description Legend/abbreviations for Table 2: Type: Input/output level: Output level: Port and control configuration inputs: I = input, O = output, S = supply CT = CMOS 0.3 VDD/0.7 VDD with input trigger HS = 20mA high sink (on N-buffer only) float = floating, wpu = weak pull-up, int = interrupt, ana = analog ports Port and control configuration outputs: OD = open drain, PP = push-pull Note: The reset configuration of each pin (shown in bold) is valid as long as the device is in reset state. Table 2. Device pin description Port/control Input(1) Main function (after reset) 20 VDD S Main power supply 3 1 RESET I/O CT 4 2 PB0/AIN0/SS I/O CT X 5 3 PB1/AIN1/SCK I/O CT X 6 4 PB2/AIN2/MISO I/O CT X 7 5 PB3/AIN3/MOSI I/O CT X 8 6 PB4/AIN4/CLKIN/ I/O CT X 9 7 PB5/AIN5 I/O CT X X ei3 ei2 X X PP 2 OD Ground ana S int VSS wpu 19 float 1 Pin name Input QFN20 Output SO20 Output Level Type Pin no. Top priority non maskable interrupt (active low) X X X Port B0 ADC analog input 0 or SPI slave select (active low) X X X Port B1 ADC analog input 1 or SPI serial clock X X X Port B2 ADC analog input 2 or SPI master in/slave out data X X X Port B3 ADC analog input 3 or SPI master out/slave in data X X X Port B4 ADC analog input 4 or external clock input X X X Port B5 ADC analog input 5 X X X Port B6 ADC analog input 6 or LINSCI input X X Port A7 LINSCI output ei2 10 8 PB6/AIN6/RDI I/O CT 11 9 PA7/TDO I/O CT HS X X X Alternate function Doc ID 11928 Rev 8 17/234 Pin description Device pin description (continued) 12 10 PA6 /MCO/ICCCLK/ BREAK I/O CT PP OD int X Output ana Input (1) wpu Port/control float Pin name Output Level Type QFN20 SO20 Pin no. Input Table 2. ST7L34 ST7L35 ST7L38 ST7L39 Main function (after reset) Alternate function X X Port A6 Main clock output or incircuit communication clock or external BREAK Caution: During normal operation this pin must be pulled- up, internally or externally (external pull-up of 10 k mandatory in noisy environment). This is to avoid entering ICC mode unexpectedly during a reset. In the application, even if the pin is configured as output, any reset puts it back in input pull-up ei1 13 11 PA5/ICCDATA/ ATPWM3 I/O CT HS X X X Port A5 Autoreload timer PWM3 or in-circuit communication data 14 12 PA4/ATPWM2 I/O CT HS X X X Port A4 Autoreload timer PWM2 15 13 PA3/ATPWM1 I/O CT HS X X X Port A3 Autoreload timer PWM1 16 14 PA2/ATPWM0 I/O CT HS X X X Port A2 Autoreload timer PWM0 17 15 PA1/ATIC I/O CT HS X X X Port A1 Autoreload timer input capture 18 16 PA0/LTIC I/O CT HS X X X Port A0 Lite timer input capture 19 17 OSC2 O 20 18 OSC1/CLKIN I ei0 X Resonator oscillator inverter output X Resonator oscillator inverter input or external clock input 1. For input with interrupt possibility `eix' defines the associated external interrupt vector which can be assigned to one of the I/O pins using the EISR register. Each interrupt can be either weak pull-up or floating defined through option register OR. 18/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 3 Register and memory map Register and memory map As shown in Figure 4, the MCU can address 64 Kbytes of memories and I/O registers. The available memory locations consist of 128 bytes of register locations, 384 bytes of RAM, 256 bytes of data EEPROM and up to 8 Kbytes of user program memory. The RAM space includes up to 128 bytes for the stack from 180h to 1FFh. The highest address bytes contain the user reset and interrupt vectors. The Flash memory contains two sectors (see Figure 4) mapped in the upper part of the ST7 addressing space so the reset and interrupt vectors are located in Sector 0 (F000h-FFFFh). The size of Flash sector 0 and other device options are configurable by option byte (refer to Section 15.2: Option bytes on page 215). Note: Memory locations marked as `Reserved' must never be accessed. Accessing a reserved area can have unpredictable effects on the device. Figure 4. Memory map 0080h Short addressing RAM (zero page) 0000h 007Fh 0080h 01FFh 0200h 0FFFh 1000h 10FFh 1100h HW registers (see Table 3) 00FFh 0100h RAM (384 bytes) 017Fh 0180h Reserved 01FFh 16-bit addressing RAM 128 bytes stack DEE0h Data EEPROM (256 bytes) DEE1h DEE2h DEE3h Reserved DFFFh E000h E000h Flash memory (8K) FFDFh FFE0h 8K Flash program memory FBFFh FC00h FFFFh DEE4h RCCRH0 RCCRL0 RCCRH1 RCCRL1 See note 1 below and Section 7.1 on page 37 7 Kbytes sector 1 1 Kbyte sector 0 Interrupt and reset vectors (see Table 14) FFFFh 1. DEE0h, DEE1h, DEE2h and DEE3h addresses are located in a reserved area but are special bytes containing also the RC calibration values which are read-accessible only in user mode. If all the EEPROM data or Flash space (including the RC calibration values locations) has been erased (after the readout protection removal), then the RC calibration values can still be obtained through these four addresses. Doc ID 11928 Rev 8 19/234 Register and memory map ST7L34 ST7L35 ST7L38 ST7L39 Legend for Table 3: x = undefined, R/W = read/write, RO = read only Table 3. Address 0000h 0001h 0002h 0003h 0004h 0005h Hardware register map Block Register label 000Dh 000Eh 000Fh 0010h 0011h 0012h 0013h 0014h 0015h 0016h 0017h 0018h 0019h 001Ah 001Bh 001Ch 001Dh 001Eh 001Fh 0020h 0021h 0022h 0023h 0024h 0025h Remarks Port A Port A data register Port A data direction register Port A option register FFh(1) 00h 40h R/W R/W R/W Port B PBDR PBDDR PBOR Port B data register Port B data direction register Port B option register FFh(1) 00h 00h R/W R/W R/W(2) Lite timer control/status register 2 Lite timer autoreload register Lite timer counter 2 register Lite timer control/status register 1 Lite timer input capture register 0Fh 00h 00h 0x00 0000b xxh R/W R/W RO R/W RO Timer control/status register Counter register 1 high Counter register 1 low Autoreload register 1 high Autoreload register 1 low PWM output control register PWM 0 control/status register PWM 1 control/status register PWM 2 control/status register PWM 3 control/status register PWM 0 duty cycle register high PWM 0 duty cycle register low PWM 1 duty cycle register high PWM 1 duty cycle register low PWM 2 duty cycle register high PWM 2 duty cycle register low PWM 3 duty cycle register high PWM 3 duty cycle register low Input capture register high Input capture register low Timer control/status register 2 Break control register Autoreload register 2 high Autoreload register 2 low Dead time generator register 0x00 0000b 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h 03h 00h 00h 00h 00h R/W RO RO R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W RO RO R/W R/W R/W R/W R/W Reserved area (2 bytes) LTCSR2 LTARR Lite timer LTCNTR 2 LTCSR1 LTICR Autoreload timer 3 ATCSR CNTR1H CNTR1L ATR1H ATR1L PWMCR PWM0CSR PWM1CSR PWM2CSR PWM3CSR DCR0H DCR0L DCR1H DCR1L DCR2H DCR2L DCR3H DCR3L ATICRH ATICRL ATCSR2 BREAKCR ATR2H ATR2L DTGR 0026h to 002Dh Reserved area (8 bytes) 002Eh WDG WDGCR Watchdog control register 7Fh R/W 0002Fh Flash FCSR Flash control/status register 00h R/W Data EEPROM control/status register 00h R/W 00030h 20/234 Reset status PADR PADDR PAOR 0006h 0007h 0008h 0009h 000Ah 000Bh 000Ch Register name EEPROM EECSR Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 3. Register and memory map Hardware register map (continued) Register label Reset status Remarks SPI data I/O register SPI control register SPI control/status register xxh 0xh 00h R/W R/W R/W ADCCSR ADCDRH ADCDRL A/D control/status register A/D data register high A/D control and data register low 00h xxh x0h R/W RO R/W EICR External interrupt control register 00h R/W MCCSR Main clock control/status register 00h R/W FFh 0110 0xx0b R/W R/W 00h R/W Address Block 0031h 0032h 0033h SPI SPIDR SPICR SPICSR 0034h 0035h 0036h ADC 0037h ITC 0038h MCC 0039h 003Ah Clock and RCCR reset SICSR 003Bh 003Ch ITC EISR 004Bh 004Ch 004Dh 004Eh 004Fh 0050h 0051h to 007Fh External interrupt selection register Reserved area (3 bytes) LINSCI (LIN master/ slave) SCISR SCIDR SCIBRR SCICR1 SCICR2 SCICR3 SCIERPR SCIETPR 0048h 0049h 004Ah RC oscillator control register System integrity control/status register Reserved area (1 byte) 003Dh to 003Fh 0040h 0041h 0042h 0043h 0044h 0045h 0046h 0047h Register name SCI status register C0h SCI data register xxh SCI baud rate register 00xx xxxxb SCI control register 1 xxh SCI control register 2 00h SCI control register 3 00h SCI extended receive prescaler register 00h SCI extended transmit prescaler 00h register RO R/W R/W R/W R/W R/W R/W R/W Reserved area (1 byte) AWU AWUPR AWUCSR AWU prescaler register AWU control/status register FFh 00h R/W R/W DM(3) DMCR DMSR DMBK1H DMBK1L DMBK2H DMBK2L DM control register DM status register DM breakpoint register 1 high DM breakpoint register 1 low DM breakpoint register 2 high DM breakpoint register 2 low 00h 00h 00h 00h 00h 00h R/W R/W R/W R/W R/W R/W Reserved area (47 bytes) 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 3. For a description of the debug module registers, see ST7 ICC protocol reference manual Doc ID 11928 Rev 8 21/234 Flash program memory ST7L34 ST7L35 ST7L38 ST7L39 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 (ICP) or in-application programming (IAP). The array matrix organization allows each sector to be erased and reprogrammed without affecting other sectors. 4.2 4.3 Main features In-circuit programming (ICP) In-application programming (IAP) In-circuit testing (ICT) for downloading and executing user application test patterns in RAM Sector 0 size configurable by option byte Readout and write protection Programming modes The ST7 can be programmed in three different ways: 4.3.1 - Insertion in a programming tool. In this mode, Flash sectors 0 and 1, option byte row and data EEPROM (if present) can be programmed or erased. - In-circuit programming. In this mode, Flash sectors 0 and 1, option byte row and data EEPROM (if present) can be programmed or erased without removing the device from the application board. - In-application programming. In this mode, sector 1 and data EEPROM (if present) can be programmed or erased without removing the device from the application board and while the application is running. 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 a cable. ICP is performed in three steps: 22/234 - 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 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Flash program 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). IAP mode is fully controlled by user software, allowing it to be adapted to the user application (such as a user-defined strategy for entering programming mode or a choice of communications protocol used to fetch the data to be stored). This 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. 4.4 ICC interface ICP needs a minimum of four and up to six 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/PB4: Main clock input for external source - VDD: Application board power supply (optional, see note 3, Figure 5: Typical ICC interface on page 24) Doc ID 11928 Rev 8 23/234 Flash program memory Figure 5. ST7L34 ST7L35 ST7L38 ST7L39 Typical ICC interface Programming tool ICC connector ICC cable ICC connector HE10 connector type (See note 3) Optional (see note 4) 9 7 5 3 1 10 8 6 4 2 Application board Application reset source See note 2 See note 1 and caution Application power supply Application I/O ICCDATA ICCCLK RESET CLKIN/PB4 (see note 5) VDD See note 1 ST7 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 must 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 application reset circuit if it drives more than 5 mA 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 must be connected to the PB4 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. ST7 devices with multi-oscillator capability must have OSC2 grounded in this case. 5. With any programming tool, while the ICP option is disabled, the external clock must be provided on PB4. 6. In ICC mode, the internal RC oscillator is forced as a clock source, regardless of the selection in the option byte. Caution: 24/234 During normal operation the ICCCLK pin must be pulled up, internally or externally (external pull-up of 10k mandatory in noisy environment). This is to avoid entering ICC mode unexpectedly during a reset. In the application, even if the pin is configured as output, any reset puts it back in input pull-up. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 4.5 Flash program memory Memory protection There are two different types of memory protection: Readout protection and write/erase protection, which can be applied individually. 4.5.1 Readout protection Readout protection, when selected, protects against program memory content extraction and against write access to Flash memory. Even if no protection can be considered as totally unbreakable, the feature provides a very high level of protection for a general purpose microcontroller. Both program and data EE memory are protected. In Flash devices, this protection is removed by reprogramming the option. In this case, both program and data EE memory are automatically erased and the device can be reprogrammed. Readout protection selection depends on the device type: 4.5.2 In Flash devices it is enabled and removed through the FMP_R bit in the option byte. In ROM devices it is enabled by the mask option specified in the option list. Flash write/erase protection Write/erase protection, when set, makes it impossible to both overwrite and erase program memory. It does not apply to EE 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. 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. Doc ID 11928 Rev 8 25/234 Flash program memory 4.7 ST7L34 ST7L35 ST7L38 ST7L39 Register description Flash control/status register (FCSR) Reset value: 0000 0000 (00h) 1st RASS key: 0101 0110 (56h) 2nd RASS key: 10101110 (AEh) FCSR Note: 7 6 5 4 3 2 1 0 Reserved Reserved Reserved Reserved Reserved OPT LAT PGM - - - - - R/W R/W R/W 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. 26/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 5 Data EEPROM 5.1 Introduction Data EEPROM The electrically erasable programmable read only memory can be used as a non volatile back-up for storing data. Using the EEPROM requires a basic access protocol described in this chapter. 5.2 Main features 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 Figure 6. EEPROM block diagram High voltage pump EECSR 0 0 0 Address decoder 0 0 4 0 E2LAT E2PGM EEPROM memory matrix (1 row = 32 x 8 bits) Row decoder 128 4 128 32 x 8 bits data latches Data multiplexer 4 Address bus Data bus Doc ID 11928 Rev 8 27/234 Data EEPROM 5.3 ST7L34 ST7L35 ST7L38 ST7L39 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: Data EEPROM programming flowchart on page 29 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. On this device, data EEPROM can also be used to execute machine code. Do not write to the data EEPROM while executing from it. This would result in an unexpected code being executed. Write operation (E2LAT = 1) To access the write mode, the E2LAT bit must be set by software (the E2PGM bit remains cleared). When a write access to the EEPROM area occurs, 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 ensure 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: 28/234 Care should be taken during the programming cycle. Writing to the same memory location over-programs the memory (logical AND between the two write access data results) 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 illustrated by Figure 9: Data EEPROM programming cycle on page 31. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Figure 7. Data EEPROM Data EEPROM programming flowchart Read mode E2LAT = 0 E2PGM = 0 Write mode E2LAT = 1 E2PGM = 0 Write up to 32 bytes in EEPROM area (with the same 11 MSB of the address) Read bytes in EEPROM area Start programming cycle E2LAT = 1 E2PGM = 1 (set by software) 0 E2LAT 1 Cleared by hardware Figure 8. Data EEPROM write operation Row/byte Row definition 0 1 2 3 ... 30 31 Physical address 0 00h...1Fh 1 20h...3Fh ... N Nx20h...Nx20h+1Fh Read operation impossible Byte 1 Byte 2 Byte 32 Read operation possible Programming cycle Phase 1 Phase 2 Writing data latches Waiting E2PGM and E2LAT to fall E2LAT bit Set by user application Cleared by hardware E2PGM bit 1. If a programming cycle is interrupted (by a reset action), the integrity of the data in memory is not guaranteed. Doc ID 11928 Rev 8 29/234 Data EEPROM 5.4 ST7L34 ST7L35 ST7L38 ST7L39 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 immediately enters this mode if there is no programming in progress, otherwise the data EEPROM finishes the cycle and then enters 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 stops 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 is not driven. If a write access occurs while E2LAT = 0, then the data on the bus is not latched. If a programming cycle is interrupted (by reset action), the integrity of the data in memory is not guaranteed. 5.6 Data EEPROM readout protection The readout protection is enabled through an option bit (see Section 15.2: Option bytes on page 215). When this option is selected, the programs and data stored in the EEPROM memory are protected against readout (including a rewrite protection). In Flash devices, when this protection is removed by reprogramming the option byte, the entire program memory and EEPROM is first automatically erased. Note: 30/234 Both program memory and data EEPROM are protected using the same option bit. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Figure 9. Data EEPROM Data EEPROM programming cycle Read operation not possible Read operation possible Internal programming voltage Erase cycle Write cycle Write of data latches tPROG LAT PGM 5.7 Register description EEPROM control/status register (EECSR) EECSR Reset value: 0000 0000 (00h) 7 6 5 4 3 2 1 0 Reserved Reserved Reserved Reserved Reserved Reserved E2LAT E2PGM - - - - - - R/W R/W Table 4. EECSR register description Bit Bit name 7:2 - 1 0 E2LAT E2PGM Function Reserved, forced by hardware to 0 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 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 5. Data EEPROM register map and reset values Address (Hex.) 0030h Register label EECSR Reset value 7 6 5 4 3 2 1 0 0 0 0 0 0 0 E2LAT 0 E2PGM 0 Doc ID 11928 Rev 8 31/234 Central processing unit ST7L34 ST7L35 ST7L38 ST7L39 6 Central processing unit 6.1 Introduction This CPU has a full 8-bit architecture and contains six internal registers allowing efficient 8bit data manipulation. 6.2 6.3 Main features 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 CPU registers The six CPU registers shown in Figure 10 are not present in the memory mapping and are accessed by specific instructions. Figure 10. CPU registers 7 0 Accumulator register Reset value = XXh 7 0 X index register Reset value = XXh 7 0 Y index register Reset value = XXh 15 PCH 8 7 PCL 0 Program counter regsiter Reset value = reset vector @ FFFEh-FFFFh 7 1 1 0 1 H I N Z C Condition code register Reset value = 1 1 1 X 1 X X X 15 8 7 0 Stack pointer register Reset value = stack higher address 1. 32/234 X = undefined value Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Central processing unit Accumulator register (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 register (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). Condition code register (CC) CC Reset value: 111x 1xxx 7 6 5 4 3 2 1 0 1 1 1 H I N Z C R/W R/W R/W R/W R/W The 8-bit condition code register contains the interrupt masks 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. Table 6. Bit 4 CC register description Bit name Function 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 instructions. 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. Doc ID 11928 Rev 8 33/234 Central processing unit Table 6. Bit 3 2 1 0 34/234 ST7L34 ST7L35 ST7L38 ST7L39 CC register description (continued) Bit name Function 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 interruptible 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. 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 (in other words, the most significant bit is a logic 1) This bit is accessed by the JRMI and JRPL test instructions. 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. 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. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Central processing unit Stack pointer register (SP) SP Reset value: 01 FFh 15 14 13 12 11 10 9 8 Reserved Reserved Reserved Reserved Reserved Reserved Reserved 1 - - - - - - - R/W 7 6 5 4 3 2 1 0 1 SP[6:0] R/W R/W The stack pointer is a 16-bit register which always points 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: Stack manipulation example on page 36). Since the stack is 128 bytes deep, the 9 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 SP6 to SP0 bits are set) which is the stack higher address. 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: Stack manipulation example on page 36. 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. Doc ID 11928 Rev 8 35/234 Central processing unit ST7L34 ST7L35 ST7L38 ST7L39 Figure 11. Stack manipulation example Call subroutine PUSH Y Interrupt event POP Y IRET RET or RSP @ 0180h SP SP CC A A A X X X PCH PCH PCH PCL PCL PCL PCH PCH PCH PCH PCH PCL PCL PCL PCL PCL SP @ 01FFh SP Y CC CC 1. Legend: stack higher address = 01FFh; stack lower address = 0180h 36/234 Doc ID 11928 Rev 8 SP SP ST7L34 ST7L35 ST7L38 ST7L39 7 Supply, reset and clock management 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 7.1 Clock management - 1 MHz internal RC oscillator (enabled by option byte) - 1 to 16 MHz or 32 kHz external crystal/ceramic resonator (selected by option byte) - External clock input (enabled by option byte) - PLL for multiplying the frequency by 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) Internal RC oscillator adjustment The device contains an internal RC oscillator with high accuracy for a given device, temperature and voltage. It must be calibrated to obtain the frequency required in the application. This is done by the software writing an 8-bit calibration value in the RCCR (RC control register) and in the bits [6:5] in the SICSR (SI control status register). Whenever the microcontroller is reset, the RCCR returns to its default value (FFh), that is, each time the device is reset, the calibration value must be loaded in the RCCR. Predefined calibration values are stored in EEPROM for 3.3 V and 5 V VDD supply voltages at 25C, as shown in Table 7. Table 7. RCCR calibration registers RCCR RCCRH0 RCCRL0 RCCRH1 RCCRL1 Conditions ST7L3 addresses VDD = 5 V TA = 25C fRC = 1 MHz(1) DEE0h(2) (CR[9:2] bits) VDD = 3.3 V TA = 25C fRC = 1 MHz(1) DEE2h(2)(CR[9:2] bits) DEE1h(2) (CR[1:0] bits) DEE3h(2) (CR[1:0] bits) 1. RCCR0 and RCCR1 calibrated within these conditions in order to reach RC accuracy as mentioned in Table 101: Operating conditions (tested for TA = -40 to +125 C) @ VDD = 4.5 to 5.5 V on page 183 and Table 103: Operating conditions (tested for TA = -40 to +125 C) @ VDD = 3.0 to 3.6 V on page 184 2. DEE0h, DEE1h, DEE2h and DEE3h addresses are located in a reserved area but are special bytes containing also the RC calibration values which are read-accessible only in user mode. If all the EEPROM data or Flash space (including the RC calibration values locations) has been erased (after the readout protection removal), then the RC calibration values can still be obtained through these four addresses. For compatibility reasons with the SICSR register, CR[1:0] bits are stored in the fifth and sixth positions of DEE1 and DEE3 addresses. Doc ID 11928 Rev 8 37/234 Supply, reset and clock management Note: ST7L34 ST7L35 ST7L38 ST7L39 1 In ICC mode, the internal RC oscillator is forced as a clock source, regardless of the selection in the option byte. 2 For more information on the frequency and accuracy of the RC oscillator see Section 13: Electrical characteristics. 3 To improve clock stability and frequency accuracy, it is recommended to place a decoupling capacitor, typically 100 nF, between the VDD and VSS pins as close as possible to the ST7 device. 4 These bytes are systematically programmed by ST, including on FASTROM devices. Consequently, customers intending to use FASTROM service must not use these bytes. 5 RCCR0 and RCCR1 calibration values are not erased if the readout protection bit is reset after it has been set (see Section 4.5.1: Readout protection on page 25). 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 1 MHz frequency from the RC oscillator or the external clock by 8 to obtain an fOSC of 8 MHz. The PLL is enabled (by 1 option bit) and the multiplication factor is 8. The x8 PLL is intended for operation with VDD in the 3.6 V to 5.5 V range. If the PLL is disabled and the RC oscillator is enabled, then fOSC = 1 MHz. If both the RC oscillator and the PLL are disabled, fOSC is driven by the external clock. Figure 12. PLL output frequency timing diagram LOCKED bit set Output frequency 4/8 x input freq. tSTAB tLOCK tSTARTUP 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. 38/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Supply, reset and clock management When the PLL output signal reaches the operating frequency, the locked bit in the SICSCR register is set. Full PLL accuracy (ACCPLL) is reached after a stabilization time of tSTAB (see Figure 12 and Section 13.3.4: Internal RC oscillator and PLL on page 188). Refer to Section 7.6.4: Register description on page 48 for a description of the locked bit in the SICSR register. 7.3 Register description Main clock control/status register (MCCSR) MCCSR Reset value: 0000 0000 (00h) 7 6 5 4 3 2 1 0 Reserved Reserved Reserved Reserved Reserved Reserved MCO SMS - - - - - - R/W R/W Table 8. MCCSR register description Bit Bit name 7:2 - 1 0 Function Reserved, must be kept cleared MCO Main clock out enable This bit is read/write by software and cleared by hardware after a reset. This bit enables the MCO output clock. 0: MCO clock disabled, I/O port free for general purpose I/O 1: MCO clock enabled 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) RC control register (RCCR) RCCR 7 Reset value: 1111 1111 (FFh) 6 5 4 3 2 1 0 CR[9:2] R/W Doc ID 11928 Rev 8 39/234 Supply, reset and clock management Table 9. Bit 7:0 ST7L34 ST7L35 ST7L38 ST7L39 RCCR register description Bit name CR[9:2] Function 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 startup. 00h = Maximum available frequency FFh = Lowest available frequency These bits are used with the CR[1:0] bits in the SICSR register. Refer to Section 7.6.4: Register description on page 48. 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. Figure 13. Clock management block diagram CR9 CR8 CR7 CR6 CR5 CR4 CR3 CR2 RCCR CR1 CR0 SICSR CLKIN/2 (ext clock) RC OSC Tunable 1% RC oscillator 1 MHz PLL 1 MHz -> 8 MHz OSCRANGE[2:0] option bits CLKIN CLKIN/ OSC1 OSC2 CLKIN fCLKINCLKIN OSC option bit /2 divider OSC 1-16 MHZ or 32 kHz fOSC PLL clock 8 MHz OSC,PLLOFF, OSCRANGE[2:0] option bits Crystal OSC /2 /2 divider fLTIMER 8-bit lite timer 2 counter fOSC /32DIVIDER divider /32 fOSC/32 fOSC 1 0 (1ms timebase @ 8 MHz fOSC) fCPU To CPU and peripherals MCO SMS MCCSR fCPU 40/234 Doc ID 11928 Rev 8 MCO ST7L34 ST7L35 ST7L38 ST7L39 7.4 Supply, reset and clock management Multi-oscillator (MO) The main clock of the ST7 can be generated by four different source types coming from the multi-oscillator block (1 to 16 MHz or 32 kHz): An external source 5 crystal or ceramic resonator oscillators An internal high frequency RC oscillator Each oscillator is optimized for a given frequency range in terms of consumption and is selectable through the option byte. The associated hardware configurations are shown in Table 14: ST7 clock sources on page 42. Refer to Section 13: Electrical characteristics for more details. 7.4.1 External clock source In external clock mode, a clock signal (square, sinus or triangle) with ~50% duty cycle must drive the OSC1 pin while the OSC2 pin is tied to ground. Note: When the multi-oscillator is not used, PB4 is selected by default as the external clock. 7.4.2 Crystal/ceramic oscillators This family of oscillators has the advantage of producing a very accurate rate on the main clock of the ST7. The selection within a list of four oscillators with different frequency ranges has to be done by option byte in order to reduce consumption (refer to Section 15.2 on page 215 for more details on the frequency ranges). In this mode of the multi-oscillator, the resonator and the load capacitors must be placed as close as possible to the oscillator pins to minimize output distortion and startup stabilization time. The loading capacitance values must be adjusted according to the selected oscillator. These oscillators are not stopped during the reset phase to avoid losing time in the oscillator startup phase. 7.4.3 Internal RC oscillator In this mode, the tunable 1%RC oscillator is the main clock source. The two oscillator pins must be tied to ground. The calibration is done through the RCCR[7:0] and SICSR[6:5] registers. Doc ID 11928 Rev 8 41/234 Supply, reset and clock management ST7L34 ST7L35 ST7L38 ST7L39 Figure 14. ST7 clock sources External clock Hardware configuration ST7 OSC1 OSC2 Crystal/ceramic resonators External source ST7 OSC1 Internal RC oscillator CL1 OSC2 Load capacitors CL2 ST7 OSC1 7.5 Reset sequence manager (RSM) 7.5.1 Introduction OSC2 The reset sequence manager includes three reset sources as shown in Figure 16: Reset block diagram on page 44: Note: External RESET source pulse Internal LVD reset (low voltage detection) Internal watchdog reset A reset can also be triggered following the detection of an illegal opcode or prebyte code. Refer to Section 12.2.2: Illegal opcode reset on page 175 for further details. These sources act on the RESET pin which is always kept low during the delay phase. The reset service routine vector is fixed at addresses FFFEh-FFFFh in the ST7 memory map. 42/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Supply, reset and clock management The basic reset sequence consists of three phases as shown in Figure 15: Caution: Active phase depending on the reset source 256 or 4096 CPU clock cycle delay (see Table 10) Reset vector fetch When the ST7 is unprogrammed or fully erased, the Flash is blank and the reset vector is not programmed. For this reason, it is recommended to keep the RESET pin in low state until programming mode is entered, in order to avoid unwanted behavior. The 256 or 4096 CPU clock cycle delay allows the oscillator to stabilize and ensures that recovery has taken place from the reset state. The shorter or longer clock cycle delay is automatically selected depending on the clock source chosen by option byte: The reset vector fetch phase duration is two clock cycles. Table 10. Clock cycle delays Clock source CPU clock cycle delay Internal RC oscillator 256 External clock (connected to CLKIN pin) External crystal/ceramic oscillator (connected to OSC1/OSC2 pins) 4096 If the PLL is enabled by option byte, it outputs the clock after an additional delay of tSTARTUP (see Figure 12: PLL output frequency timing diagram on page 38). Figure 15. Reset sequence phases Reset Active phase 7.5.2 Internal reset Fetch vector 256 or 4096 clock cycles 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 Section 13: Electrical characteristics for more details. A reset signal originating from an external source must have a duration of at least th(RSTL)in in order to be recognized (see Figure 17: Reset sequences on page 45). This detection is asynchronous and therefore the MCU can enter the reset state even in halt mode. Doc ID 11928 Rev 8 43/234 Supply, reset and clock management ST7L34 ST7L35 ST7L38 ST7L39 Figure 16. Reset block diagram VDD RON Internal reset Filter RESET Pulse generator Watchdog reset Illegal opcode reset(1) LVD reset 1. See Section 12.2.2: Illegal opcode reset on page 175 for more details on illegal opcode reset conditions 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 Section 13: Electrical characteristics. 7.5.3 External power-on reset If the LVD is disabled by the option byte, to start up the microcontroller correctly, the user must use an external reset circuit to ensure that the reset signal is held low until VDD is over the minimum level specified for the selected fOSC frequency. A proper reset signal for a slow rising VDD supply can generally be provided by an external RC network connected to the RESET pin. 7.5.4 Internal low voltage detector (LVD) reset Two different reset sequences caused by the internal LVD circuitry can be distinguished: Power-on reset Voltage drop reset The device RESET pin acts as an output that is pulled low when VDD < VIT+ (rising edge) or VDD < VIT- (falling edge) as shown in Figure 17: Reset sequences on page 45. The LVD filter spikes on VDD larger than tg(VDD) to avoid parasitic resets. 7.5.5 Internal watchdog reset The reset sequence generated by an internal Watchdog counter overflow is shown in Figure 17: Reset sequences on page 45. Starting from the Watchdog counter underflow, the device RESET pin acts as an output that is pulled low during at least tw(RSTL)out. 44/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Supply, reset and clock management Figure 17. Reset sequences VDD VIT+(LVD) VIT-(LVD) LVD reset Run External reset Run Active phase Active phase Watchdog reset Run th(RSTL)in Run Active phase tw(RSTL)out External RESET source RESET pin Watchdog reset Watchdog underflow Internal reset (256 or 4096 tCPU) Vector fetch 7.6 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. Note: A reset can also be triggered following the detection of an illegal opcode or prebyte code. Refer to Section 12.2.2: Illegal opcode reset on page 175 for further details. 7.6.1 Low voltage detector (LVD) The low voltage detector (LVD) function 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 VIT+(LVD) reference value for power-on 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 18: Low voltage detector vs. reset on page 46. The LVD can be enabled by option byte with highest voltage threshold. Doc ID 11928 Rev 8 45/234 Supply, reset and clock management ST7L34 ST7L35 ST7L38 ST7L39 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. Note: 1 The LVD allows the device to be used without any external reset circuitry. 2 The LVD is an optional function which can be selected by the option byte. 3 Use of LVD with capacitive power supply: With this type of power supply, if power cuts occur in the application, it is recommended to pull VDD down to 0 V to ensure optimum restart conditions. Refer to the circuit example in Figure 98: RESET pin protection when LVD Is enabled on page 206 and Note on the same page. 4 For the application to function correctly, it is recommended to make sure that the VDD supply voltage rises monotonously when the device is exiting from reset, to ensure the application functions properly. Figure 18. Low voltage detector vs. reset VDD Vhys VIT+(LVD) VIT-(LVD) RESET 46/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Supply, reset and clock management Figure 19. Reset and supply management block diagram Watchdog timer (WDG) Status flag System integrity management AVD interrupt request Reset sequence manager (RSM) RESET SICSR WD GRF LOC KED LV AV AV DRF DF DIE Low voltage detector (LVD) VSS VDD Auxiliary voltage detector (AVD) 7.6.2 Low power modes Table 11. Effect of low power modes on system integrity Mode 7.6.3 Description Wait No effect on SI. AVD interrupts cause the device to exit from wait mode. Halt The SICSR register is frozen. The AVD becomes inactive and the AVD interrupt cannot be used to exit from halt mode. Interrupts The AVD interrupt event generates an interrupt if the corresponding enable control bit (AVDIE) is set and the interrupt mask in the CC register is reset (RIM instruction). Table 12. Supply, reset and clock management interrupt control/wake-up capability Interrupt event Event flag Enable control bit Exit from wait Exit from halt AVD event AVDF AVDIE Yes No 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 VIT+(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. Doc ID 11928 Rev 8 47/234 Supply, reset and clock management ST7L34 ST7L35 ST7L38 ST7L39 Monitoring the VDD main supply The AVD voltage threshold value is relative to the selected LVD threshold configured by option byte (see Section 15.2 on page 215). 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 20. Figure 20. Using the AVD to monitor VDD VDD Early warning interrupt (power has dropped, MCU not yet in reset) Vhyst VIT+(AVD) VIT-(AVD) VIT+(LVD) VIT-(LVD) AVDF bit 0 1 RESET 1 0 AVD interrupt request if AVDIE bit = 1 Interrupt cleared by reset Interrupt cleared by hardware LVD RESET 7.6.4 Register description System integrity (SI) control/status register (SICSR) SICSR 7 6 5 4 3 2 1 0 Reserved CR[1:0] WDGRF LOCKED LVDRF AVDF AVDIE - R/W R/W R/W R/W R/W R/W Table 13. SICSR register description Bit Bit name 7 - 6:5 48/234 Reset value: 0110 0xx0 (6xh) CR[1:0] Function Reserved, must be kept cleared RC oscillator frequency adjustment bits These bits, as well as CR[9:2] bits in the RCCR register must be written immediately after reset to adjust the RC oscillator frequency and to obtain an accuracy of 1%. Refer to Section 7.3: Register description on page 39 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 13. Bit 4 3 2 1 0 Supply, reset and clock management SICSR register description (continued) Bit name Function WDGRF Watchdog reset flag This bit indicates that the last reset was generated by the watchdog peripheral. It is set by hardware (watchdog reset) and cleared by software (by reading SICSR register) or an LVD reset (to ensure a stable cleared state of the WDGRF flag when CPU starts). Combined with the LVDRF flag information, the flag description is given as follows: 00 (LVDRF, WDGRF): Reset sources = External RESET pin 01 (LVDRF, WDGRF): Reset sources = Watchdog 1X (LVDRF, WDGRF): Reset sources = LVD 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 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 (by reading). When the LVD is disabled by option byte, the LVDRF bit value is undefined. Note: 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. AVDF Voltage detector flag This read-only bit is set and cleared by hardware. If the AVDIE bit is set, an interrupt request is generated when the AVDF bit is set. Refer to Figure 20 and to Monitoring the VDD main supply on page 48 for additional details. 0: VDD over AVD threshold 1: VDD under AVD threshold AVDIE Voltage detector interrupt enable This bit is set and cleared by software. It enables an interrupt to be generated when the AVDF flag is set. The pending interrupt information is automatically cleared when software enters the AVD interrupt routine. 0: AVD interrupt disabled 1: AVD interrupt enabled Doc ID 11928 Rev 8 49/234 Interrupts 8 ST7L34 ST7L35 ST7L38 ST7L39 Interrupts The ST7 core may be interrupted by one of two different methods: Maskable hardware interrupts as listed in Table 14: Interrupt mapping on page 53 and a non-maskable software interrupt (TRAP). The interrupt processing flowchart is shown in Figure 21: Interrupt processing flowchart on page 52. 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 Table 14: Interrupt mapping 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 is cleared and the main program resumes. 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 Table 14: Interrupt mapping). 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 inTable 14: Interrupt mapping). 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 is serviced according to the flowchart in Figure 21: Interrupt processing flowchart on page 52. 50/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 8.2 Interrupts 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. 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 in Section 10: I/O ports), a low level on an I/O pin, configured as input with interrupt, masks the interrupt request even in case of rising-edge 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 following conditions are met: The I bit of the CC register is cleared The corresponding enable bit is set in the control register If either of these two conditions is false, the interrupt is latched and thus remains pending. Clearing an interrupt request is done by: Note: 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. The clearing sequence resets the internal latch. A pending interrupt (that is, waiting for being enabled) will therefore be lost if the clear sequence is executed. Doc ID 11928 Rev 8 51/234 Interrupts ST7L34 ST7L35 ST7L38 ST7L39 Figure 21. Interrupt processing flowchart From reset N I bit set? Y Fetch next instruction N Interrupt pending? Y 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 52/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 14. No. Interrupt mapping Source block Description Reset Reset TRAP Software interrupt 0 AWU 1 ei0 External interrupt 0 2 ei1 External interrupt 1 3 ei2 External interrupt 2 4 ei3 External interrupt 3 5 Lite timer 6 LINSCI 7 SI 8 At timer 9 10 11 Interrupts Lite timer 12 SPI 13 At timer Auto wakeup interrupt Register label Priority order Exit from halt or AWUFH Address vector - Highest priority Yes FFFEh-FFFFh No FFFCh-FFFDh AWUCSR Yes (1) FFFAh-FFFBh FFF8h-FFF9h - Yes FFF6h-FFF7h FFF4h-FFF5h FFF2h-FFF3h Lite timer RTC2 interrupt LTCSR2 No FFF0h-FFF1h LINSCI interrupt SCICR1/ SCICR2 No FFEEh-FFEFh SICSR No FFECh-FFEDh PWMxCSR or ATCSR No FFEAh-FFEBh At timer overflow interrupt ATCSR Yes(2) FFE8h-FFE9h Lite timer input capture interrupt LTCSR No FFE6h-FFE7h Lite timer RTC1 interrupt LTCSR Yes(2) FFE4h-FFE5h SPI peripheral interrupts SPICSR Yes FFE2h-FFE3h At timer overflow interrupt 2 ATCSR2 No FFE0h-FFE1h AVD interrupt At timer output compare Interrupt or input capture interrupt lowest priority 1. This interrupt exits the MCU from `auto wakeup from halt' mode only 2. These interrupts exit the MCU from `active halt' mode only Doc ID 11928 Rev 8 53/234 Interrupts ST7L34 ST7L35 ST7L38 ST7L39 External interrupt control register (EICR) EICR Reset value: 0000 0000 (00h) 7 6 1 3 2 1 0 IS2[1:0] IS1[1:0] IS0[1:0] R/W R/W R/W R/W EICR register description Bit Bit name Function 7:6 IS3[1:0] ei3 sensitivity These bits define the interrupt sensitivity for ei3 (port B0) according to Table 16 5:4 IS2[1:0] ei2 sensitivity These bits define the interrupt sensitivity for ei2 (port B3) according to Table 16 3:2 IS1[1:0] ei1 sensitivity These bits define the interrupt sensitivity for ei1 (port A7) according to Table 16 1:0 IS0[1:0] ei0 sensitivity These bits define the interrupt sensitivity for ei0 (port A0) according to Table 16 These 8 bits can be written only when the I bit in the CC register is set. Table 16. 54/234 4 IS3[1:0] Table 15. Note: 5 Interrupt sensitivity bits ISx1 ISx0 External interrupt sensitivity 0 0 Falling edge and low level 0 1 Rising edge only 1 0 Falling edge only 1 1 Rising and falling edge Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Interrupts External interrupt selection register (EISR) Reset value: 0000 0000 (00h) EISR 7 6 7:6 5:4 3:2 1:0 4 3 2 1 0 ei3[1:0] ei2[1:0] ei1[1:0] ei0[1:0] R/W R/W R/W R/W Table 17. Bit 5 EISR register description Bit name Function ei3[1:0] ei3 pin selection These bits are written by software. They select the port B I/O pin used for the ei3 external interrupt as follows: 00: I/O pin = No interrupt (reset state) 01: I/O pin = PB0 10: I/O pin = PB1 11: I/O pin = PB2 ei2[1:0] ei2 pin selection These bits are written by software. They select the port B I/O pin used for the ei2 external interrupt as follows: 00: I/O pin = No interrupt (reset state) 01: I/O pin = PB3 10: I/O pin = PB5 11: I/O pin = PB6 ei1[1:0] ei1 pin selection These bits are written by software. They select the port A I/O pin used for the ei1 external interrupt as follows: 00: I/O pin = No interrupt (reset state) 01: I/O pin = PA4 10: I/O pin = PA5 11: I/O pin = PA6 ei0[1:0] ei0 pin selection These bits are written by software. They select the port A I/O pin used for the ei0 external interrupt as follows: 00: I/O pin = No interrupt (reset state)PA0 (reset state) 01: I/O pin = PA1 10: I/O pin = PA2 11: I/O pin = PA3 Doc ID 11928 Rev 8 55/234 Power saving modes ST7L34 ST7L35 ST7L38 ST7L39 9 Power saving modes 9.1 Introduction To give a large measure of flexibility to the application in terms of power consumption, five main power saving modes are implemented in the ST7 (see Figure 22): Slow Wait (and Slow-Wait) Active halt Auto wakeup from halt (AWUFH) 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 divided or multiplied by 2 (fOSC2). From run mode, the different power saving modes can be selected by setting the relevant register bits or by calling the specific ST7 software instruction whose action depends on the oscillator status. Figure 22. Power saving mode transitions High Run Slow Wait Slow wait Active halt Auto wakeup from halt Halt Low Power consumption 56/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 9.2 Power saving modes 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. Note: Slow-wait mode is activated when entering wait mode while the device is already in slow mode. Figure 23. Slow mode clock transition fOSC/32 fOSC fCPU fOSC SMS Normal run mode request Doc ID 11928 Rev 8 57/234 Power saving modes 9.3 ST7L34 ST7L35 ST7L38 ST7L39 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 a reset or an interrupt occurs, causing it to wake up. Then the program counter branches to the starting address of the interrupt or reset service routine. Refer to Figure 24: Wait mode flowchart. Figure 24. Wait mode flowchart WFI instruction Oscillator Peripherals On On Off 0 CPU I bit N Reset Y N Interrupt Y Oscillator Peripherals CPU I BIT On Off On 0 256 or 4096 CPU clock cycle delay Oscillator Peripherals CPU I bit On On On X(1) Fetch reset vector or service interrupt 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. 58/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 9.4 Power saving modes 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 is disabled (see Section 9.5: Active halt mode on page 61 for more details) and when the AWUEN bit in the AWUCSR register is cleared. The MCU can exit halt mode on reception of either a specific interrupt (see Table 14: Interrupt mapping on page 53) or a reset. When exiting halt mode by means of a reset or an interrupt, the oscillator is immediately turned on and the 256 or 4096 CPU cycle delay is used to stabilize the oscillator. After the startup delay, the CPU resumes operation by servicing the interrupt or by fetching the reset vector which woke it up (see Figure 26: Halt mode flowchart on page 60). 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 up immediately. In halt mode, the main oscillator is turned off, stopping all internal processing, including the operation of the on-chip peripherals. All peripherals are not clocked except those which receive 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 15.2: Option bytes on page 215 for more details). Figure 25. Halt timing overview Run Halt HALT instruction [Active halt disabled] 256 or 4096 CPU cycle delay Run Reset or interrupt Doc ID 11928 Rev 8 Fetch vector 59/234 Power saving modes ST7L34 ST7L35 ST7L38 ST7L39 Figure 26. Halt mode flowchart HALT instruction (active Halt disabled) (AWUCSR.AWUEN=0) Watchdog Enable Disable 0 WDGHALT(1) 1 Oscillator Peripherals(2) WATCHDOG RESET Off Off Off 0 CPU I bit N Reset Y N Interrupt Y (3) Oscillator Peripherals CPU I bit On Off On X(4) 256 or 4096 CPU clock cycle delays(5) Oscillator Peripherals CPU I bit On On On X(4) Fetch reset vector or service interrupt 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 14: Interrupt mapping on page 53 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 on page 38). 60/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 9.4.1 9.5 Power saving modes 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, re-initialize the corresponding I/O as `input pull-up with interrupt' or `floating interrupt' before executing the HALT instruction. The main reason for this is that the I/O may be incorrectly configured due to external interference or by an unforeseen logical condition. For the same reason, re-initialize 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 program memory with the value 0x8E. As the HALT instruction clears the interrupt mask 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 wakeup event (reset or external interrupt). Active halt mode Active halt mode is the lowest power consumption mode of the MCU with a real-time clock (RTC) available. It is 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: Table 18. LTCSR/ATCSR register status LTCSR1 TB1IE bit ATCSR OVFIE bit ATCSRCK1 bit ATCSRCK0 bit 0 x x 0 0 0 x x 1 x x x x 1 0 1 Meaning Active halt mode disabled Active halt mode enabled The MCU exits in active halt mode on reception of a specific interrupt (see Table 14: Interrupt mapping on page 53) or a reset. When exiting active halt mode by means of a reset, a 256 CPU cycle delay occurs. After the startup delay, the CPU resumes operation by fetching the reset vector which woke it up (see Figure 28: Active halt mode flowchart on page 62). 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 28: Active halt mode flowchart on page 62). 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 (see Figure 28, Note 2). Doc ID 11928 Rev 8 61/234 Power saving modes ST7L34 ST7L35 ST7L38 ST7L39 In active halt mode, only the main oscillator and the selected timer counter (LT/AT) are running to keep a wakeup time base. All other peripherals are not clocked except those which receive their clock supply from another clock generator (such as external or auxiliary oscillator). Note: As soon as active halt is enabled, executing a HALT instruction while the watchdog is active does not generate a reset. This means that the device cannot exceed a defined delay in this power saving mode. Figure 27. Active halt timing overview Run Active halt 256 or 4096 CPU cycle delay(1) HALT instruction [Active halt enabled] Run Reset or interrupt Fetch vector 1. This delay occurs only if the MCU exits active halt mode by means of a reset. Figure 28. Active halt mode flowchart HALT instruction (active halt enabled) (AWUCSR.AWUEN = 0) Oscillator Peripherals(1) On Off Off 0 CPU I bit N Reset Y N Interrupt(2) Y Oscillator Peripherals(1) CPU I bit On Off On X(3) 256 or 4096 CPU clock cycle delay Oscillator Peripherals CPU I bit On On On X(3) Fetch reset vector or service interrupt 1. Peripherals clocked with an external clock source can still be active. 2. Only the RTC1 interrupt and some specific interrupts can exit the MCU from active halt mode. Refer to Table 14: Interrupt mapping for more details. 3. 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. 62/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 9.6 Power saving modes Auto wakeup from halt mode Auto wakeup from halt (AWUFH) mode is similar to halt mode with the addition of a specific internal RC oscillator for wakeup (auto wakeup from halt oscillator). Compared to active halt mode, AWUFH has lower power consumption (the main clock is not kept running but there is no accurate real-time clock available). It is entered by executing the HALT instruction when the AWUEN bit in the AWUCSR register has been set. Figure 29. AWUFH mode block diagram AWUCK opt bit AWU RC oscillator 1 To autoreload timer input capture 32 kHz oscillator 0 fAWU_RC /64 divider AWUFH prescaler/1 .. 255 AWUFH interrupt (ei0 source) As soon as halt mode is entered and if the AWUEN bit has been set in the AWUCSR register, the AWU RC oscillator provides a clock signal (fAWU_RC). Its frequency is divided by a fixed divider and a programmable prescaler controlled by the AWUPR register. The output of this prescaler provides the delay time. When the delay has elapsed, the AWUF flag is set by hardware and an interrupt wakes up the MCU from halt mode. At the same time, the main oscillator is immediately turned on and a 256-cycle delay is used to stabilize it. After this startup delay, the CPU resumes operation by servicing the AWUFH interrupt. The AWU flag and its associated interrupt are cleared by software reading the AWUCSR register. To compensate for any frequency dispersion of the AWU RC oscillator, it can be calibrated by measuring the clock frequency fAWU_RC and then calculating the right prescaler value. Measurement mode is enabled by setting the AWUM bit in the AWUCSR register in run mode. This connects fAWU_RC to the input capture of the 12-bit autoreload timer, allowing the fAWU_RC to be measured using the main oscillator clock as a reference timebase. Doc ID 11928 Rev 8 63/234 Power saving modes ST7L34 ST7L35 ST7L38 ST7L39 Similarities with halt mode The following AWUFH mode behavior is the same as normal halt mode: The MCU can exit AWUFH mode by means of any interrupt with exit from halt capability or a reset (see Section 9.4: Halt mode on page 59). When entering AWUFH mode, the I bit in the CC register is forced to 0 to enable interrupts. Therefore, if an interrupt is pending, the MCU wakes up immediately. In AWUFH mode, the main oscillator is turned off, stopping all internal processing, including the operation of the on-chip peripherals. None of the peripherals are clocked except those which receive their clock supply from another clock generator (such as an external or auxiliary oscillator like the AWU oscillator). The compatibility of watchdog operation with AWUFH mode is configured by the WDGHALT option bit in the option byte. Depending on this setting, the HALT instruction, when executed while the Watchdog system is enabled, can generate a watchdog reset. Figure 30. AWUF halt timing diagram tAWU Run mode Halt mode 256 or 4096 tCPU Run mode fCPU fAWU_RC Clear by software AWUFH interrupt 64/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Power saving modes Figure 31. AWUFH mode flowchart Halt instruction (active halt disabled) (AWUCSR.AWUEN = 1) Enable WDGHALT(1) Watchdog 0 Disable 1 Watchdog reset AWU RC OSC Main OSC Peripherals(2) On Off Off Off 10 CPU I[1:0] bits N Reset Y N Interrupt(3) Y AWU RC OSC Main OSC Peripherals CPU I[1:0] bits Off On Off On XX(4) 256 or 4096 CPU clock cycle delay(5) AWU RC OSC Off Main OSC Peripherals On CPU I[1:0] bits On On XX(4) Fetch reset vector or service interrupt 1. WDGHALT is an option bit. See Section 15.2: Option bytes on page 215 for more details. 2. Peripheral clocked with an external clock source can still be active. 3. Only an AWUFH interrupt and some specific interrupts can exit the MCU from halt mode (such as external interrupt). Refer to Table 14: Interrupt mapping on page 53 for more details. 4. Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits of the CC register are set to the current software priority level of the interrupt routine and recovered when the CC register is popped. 5. If the PLL is enabled by the option byte, it outputs the clock after an additional delay of tSTARTUP (see Figure 12: PLL output frequency timing diagram on page 38). Doc ID 11928 Rev 8 65/234 Power saving modes ST7L34 ST7L35 ST7L38 ST7L39 Register description AWUFH control/status register (AWUCSR) AWUCSR 7 6 5 4 3 2 1 0 Reserved Reserved Reserved Reserved Reserved AWUF AWUM AWUEN - - - - - R/W R/W R/W Table 19. AWUCSR register description Bit Bit name 7:3 - 2 1 0 66/234 Reset value: 0000 0000 (00h) Function Reserved, must be kept cleared AWUF Auto wakeup flag This bit is set by hardware when the AWU module generates an interrupt and cleared by software on reading AWUCSR. Writing to this bit does not change its value. 0: No AWU interrupt occurred 1: AWU interrupt occurred AWUM Auto wakeup measurement This bit enables the AWU RC oscillator and connects its output to the input capture of the 12-bit autoreload timer. This allows the timer to measure the AWU RC oscillator dispersion and then compensate this dispersion by providing the right value in the AWUPR register. 0: Measurement disabled 1: Measurement enabled AWUEN Auto wakeup from halt enabled This bit enables the auto wakeup from halt feature: Once halt mode is entered, the AWUFH wakes up the microcontroller after a time delay dependent on the AWU prescaler value. It is set and cleared by software. 0: AWUFH (auto wakeup from halt) mode disabled 1: AWUFH (auto wakeup from halt) mode enabled Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Power saving modes AWUFH prescaler register (AWUPR) AWUPR Reset value: 1111 1111 (FFh) 7 6 5 4 3 2 1 0 AWUPR[7:0] R/W Table 20. AWUPR register description Bit Bit name 7:0 AWUPR[7:0] Table 21. Function Auto wakeup prescaler These 8 bits define the AWUPR dividing factor as explained in Table 21 AWUPR dividing factor AWUPR[7:0] Dividing factor 00h Forbidden 01h 1 ... ... FEh 254 FFh 255 In AWU mode, the period that the MCU stays in halt mode (tAWU in Figure 30: AWUF halt timing diagram on page 64) is defined by 1 t AWU = 64 x AWUPR x -------------------------- + t RCSTRT f AWURC This prescaler register can be programmed to modify the time that the MCU stays in halt mode before waking up automatically. Note: If 00h is written to AWUPR, depending on the product, an interrupt is generated immediately after a HALT instruction or the AWUPR remains unchanged. Table 22. AWU register map and reset values Address (Hex.) Register label 0049h AWUPR Reset value 004Ah AWUCSR Reset value 7 6 5 4 3 2 1 0 AWUPR7 AWUPR6 AWUPR5 AWUPR4 AWUPR3 AWUPR2 AWUPR1 AWUPR0 1 1 1 1 1 1 1 1 0 0 0 0 Doc ID 11928 Rev 8 0 AWUF AWUM AWUEN 67/234 I/O ports ST7L34 ST7L35 ST7L38 ST7L39 10 I/O ports 10.1 Introduction The I/O ports allow data transfer. An I/O port contains up to eight pins. Each pin can be programmed independently either as a digital input or digital output. In addition, specific pins may have several other functions. These functions can include external interrupt, alternate signal input/output for on-chip peripherals or analog input. 10.2 Functional description A data register (DR) and a data direction register (DDR) are always associated with each port. The option register (OR), which allows input/output options, may or may not be implemented. The following description takes into account the OR register. Refer toSection 10.7: Device-specific I/O port configuration on page 73 for device specific information. An I/O pin is programmed using the corresponding bits in the DDR, DR and OR registers: Bit x corresponding to pin x of the port. Figure 32: I/O port general block diagram on page 70 shows the generic I/O block diagram. 10.2.1 Input modes Clearing the DDRx bit selects input mode. In this mode, reading its DR bit returns the digital value from that I/O pin. If an OR bit is available, different input modes can be configured by software: Floating or pull-up. Refer to Section 10.3: I/O port implementation on page 72 for configuration. Note: 1 Writing to the DR modifies the latch value but does not change the state of the input pin. 2 Do not use read/modify/write instructions (BSET/BRES) to modify the DR register. External interrupt function Depending on the device, setting the ORx bit while in input mode can configure an I/O as an input with interrupt. In this configuration, a signal edge or level input on the I/O generates an interrupt request via the corresponding interrupt vector (eix).Falling or rising edge sensitivity is programmed independently for each interrupt vector. The external interrupt control register (EICR) or the miscellaneous register controls this sensitivity, depending on the device. Each external interrupt vector is linked to a dedicated group of I/O port pins (see pinout description in Section 2: Pin description on page 16 and interrupt section).If several I/O interrupt pins on the same interrupt vector are selected simultaneously, they are logically combined. For this reason, if one of the interrupt pins is tied low, it may mask the others. External interrupts are hardware interrupts. Fetching the corresponding interrupt vector automatically clears the request latch. Changing the sensitivity bits clears any pending interrupts. 68/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 10.2.2 I/O ports Output modes Setting the DDRx bit selects output mode. Writing to the DR bits applies a digital value to the I/O through the latch. Reading the DR bits returns the previously stored value. If an OR bit is available, different output modes can be selected by software: Push-pull or open-drain. Refer to Section 10.3: I/O port implementation on page 72 for configuration. Table 23. 10.2.3 DR value and output pin status DR Push-pull Open-drain 0 VOL VOL 1 VOH Floating Alternate functions Many ST7 I/Os have one or more alternate functions. These may include output signals from, or input signals to, on-chip peripherals. Table 2: Device pin description on page 17 describes which peripheral signals can be input/output to which ports. A signal coming from an on-chip peripheral can be output on an I/O. To do this, enable the on-chip peripheral as an output (enable bit in the peripheral's control register). The peripheral configures the I/O as an output and takes priority over standard I/O programming. The I/O's state is readable by addressing the corresponding I/O data register. Configuring an I/O as floating enables alternate function input. It is not recommended to configure an I/O as pull-up as this increases current consumption. Before using an I/O as an alternate input, configure it without interrupt. Otherwise spurious interrupts can occur. Configure an I/O as input floating for an on-chip peripheral signal which can be input and output. Caution: I/Os which can be configured as both an analog and digital alternate function need special attention. The user must control the peripherals so that the signals do not arrive at the same time on the same pin. If an external clock is used, only the clock alternate function should be employed on that I/O pin and not the other alternate function. Doc ID 11928 Rev 8 69/234 I/O ports ST7L34 ST7L35 ST7L38 ST7L39 Figure 32. I/O port general block diagram Alternate Register access output from on-chip peripheral 1 VDD 0 P-buffer (see table below) Alternate enable bit Pull-up (see table below DR VDD DDR Pull-up condition Data bus OR Pad If implemented OR SEL N-buffer Diodes (see table below) DDR SEL Analog input CMOS Schmitt DR SEL 1 trigger 0 Alternate input tot on-chip peripheral External Combinational Logic Interrupt request (eix) Sensitivity selection Table 24. From other bits I/O port mode options(1) Diodes Configuration mode Pull-up Floating with/without interrupt Off Pull-up with/without interrupt On Input P-buffer to VDD(2) to VSS Off On Push-pull On On Off Output Open drain (logic level) True open drain Off NI NI NI(3) 1. Legend: Off = implemented not activated; On = implemented and activated 2. The diode to VDD is not implemented in the true open drain pads. A local protection between the pad and VOL is implemented to protect the device against positive stress. 3. For further details on port configuration, please refer to Table 28: Port configuration (standard ports) and Table 29: Port configuration (external interrupts) on page 73. 70/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 25. I/O ports I/O configuration Hardware configuration VDD DR register access Note 3 Pull-up condition RPU W DR register Data bus Pad Input(1) R Alternate input to on-chip peripheral From other pins Interrupt condition External interrupt source (eix) Combinational logic Polarity selection Analog input Open-drain output(2) VDD Note 3 DR register access RPU Pad DR register R/W Data bus DR register access Note 3 Push-pull output(2) VDD RPU DR register Pad Alternate enable bit R/W Data bus Alternate output from on-chip peripheral 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. 3. For true open drain, these elements are not implemented Analog alternate function Configure the I/O as floating input to use an ADC input. The analog multiplexer (controlled by the ADC registers) switches the analog voltage present on the selected pin to the common analog rail, connected to the ADC input. Doc ID 11928 Rev 8 71/234 I/O ports ST7L34 ST7L35 ST7L38 ST7L39 Analog recommendations Do not change the voltage level or loading on any I/O while conversion is in progress. Do not have clocking pins located close to a selected analog pin. Warning: 10.3 The analog input voltage level must be within the limits stated in the absolute maximum ratings. I/O port implementation The hardware implementation on each I/O port depends on the settings in the DDR and OR registers and specific I/O port features such as ADC input or 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 33. Other transitions are potentially risky and should be avoided, since they may present unwanted side-effects such as spurious interrupt generation. Figure 33. Interrupt I/O port state transitions 01 00 10 11 Input floating/pull-up interrupt Input floating (reset state) Output open-drain Output push-pull XX 10.4 = DDR, OR Unused I/O pins Unused I/O pins must be connected to fixed voltage levels. Refer to Section 13.8: I/O port pin characteristics on page 199. 10.5 Low-power modes Table 26. Mode 72/234 Effect of low power modes on I/O ports Description Wait No effect on I/O ports. External interrupts cause the device to exit from wait mode. Halt No effect on I/O ports. External interrupts cause the device to exit from halt mode. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 10.6 I/O ports Interrupts The external interrupt event generates an interrupt if the corresponding configuration is selected with DDR and OR registers and if the I bit in the CC register is cleared (RIM instruction). Table 27. I/O interrupt control/wake-up capability Interrupt event External interrupt on selected external event Event flag Enable control bit Exit from wait Exit from halt Yes Yes DDRx ORx - Related documentation 10.7 SPI communication between ST7 and EEPROM (AN970) S/W implementation of I2C bus master (AN1045) Software LCD driver (AN1048) Device-specific I/O port configuration The I/O port register configurations are summarized as follows: Table 28. Port configuration (standard ports) Input (DDR = 0) Port Output (DDR = 1) Pin name Port A PA7:0 Port B PB6:0 OR = 0 OR = 1 OR = 0 OR = 1 Floating Pull-up Open drain Push-pull On ports where the external interrupt capability is selected using the EISR register, the configuration is as follows: Table 29. Port configuration (external interrupts) Input with interrupt (DDR = 0; EISR 00) Port Pin name Port A PA6:1 Port B PB5:0 Table 30. OR = 0 OR = 1 Floating Pull-up I/O port register map and reset values Address (Hex.) Register label 7 6 5 4 3 2 1 0 1 1 1 1 1 1 LSB 1 0 LSB 0 0000h PADR Reset value MSB 1 0001h PADDR Reset value MSB 0 0 Doc ID 11928 Rev 8 0 0 0 0 73/234 I/O ports ST7L34 ST7L35 ST7L38 ST7L39 Table 30. I/O port register map and reset values (continued) Address (Hex.) Register label 74/234 7 6 5 4 3 2 1 0 0002h PAOR Reset value MSB 0 1 0 0 0 0 0 LSB 0 0003h PBDR Reset value MSB 1 1 1 1 1 1 1 LSB 1 0004h PBDDR Reset value MSB 0 0 0 0 0 0 0 LSB 0 0005h PBOR Reset value MSB 0 0 0 0 0 0 0 LSB 0 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals 11 On-chip peripherals 11.1 Watchdog timer (WDG) 11.1.1 Introduction The watchdog timer is used to detect the occurrence of a software fault, usually generated by external interference or by unforeseen logical conditions, which causes the application program to abandon its normal sequence. The watchdog circuit generates an MCU reset upon expiration of a programmed time period, unless the program refreshes the counter's contents before the T6 bit is cleared. 11.1.2 11.1.3 Main features Programmable free-running downcounter (64 increments of 16000 CPU cycles) Programmable reset Reset (if watchdog activated) when the T6 bit reaches zero Optional reset on HALT instruction (configurable by option byte) Hardware watchdog selectable by option byte Functional description The counter value stored in the CR register (bits T[6:0]) is decremented every 16000 machine cycles and the length of the timeout period can be programmed by the user in 64 increments. If the watchdog is activated (the WDGA bit is set) and when the 7-bit timer (bits T[6:0]) rolls over from 40h to 3Fh (T6 becomes cleared), it initiates a reset cycle pulling low the reset pin for typically 30 s. Figure 34. Watchdog block diagram Reset Watchdog control register (CR) WDGA T6 T5 T4 T3 T2 T1 T0 7-bit downcounter fCPU Clock divider / 16000 Doc ID 11928 Rev 8 75/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 The application program must write in the CR register at regular intervals during normal operation to prevent an MCU reset. This downcounter is free-running: It counts down, even if the watchdog is disabled. The value to be stored in the CR register must be between FFh and C0h (see Table 31): The WDGA bit is set (watchdog enabled) The T6 bit is set to prevent generating an immediate reset The T[5:0] bits contain the number of increments which represents the time delay before the watchdog produces a reset. Following a reset, the watchdog is disabled. Once activated, it can be disabled only by a reset. The T6 bit can generate a software reset (the WDGA bit is set and the T6 bit is cleared). If the watchdog is activated, the HALT instruction generates a reset. . Table 31. Watchdog timing(1) fCPU = 8 MHz WDG counter code min. (ms) max (ms) C0h 1 2 FFh 127 128 1. The timing variation shown in Table 31 is due to the unknown status of the prescaler when writing to the CR register. 11.1.4 Hardware watchdog option If hardware watchdog is selected by the option byte, the watchdog is always active and the WDGA bit in the CR is not used. Refer to the option byte description in Section 15.2: Option bytes on page 215. Using halt mode with the WDG (WDGHALT option) If halt mode with watchdog is enabled by the 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. 11.1.5 Interrupts None. 76/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 11.1.6 On-chip peripherals Register description Watchdog control register (WDGCR) WDGCR Reset value: 0111 1111 (7Fh) 7 6 5 4 3 WDGA T[6:0] R/W R/W Table 32. Bit 2 1 0 WDGCR register description Bit name Function 7 WDGA Activation bit(1) This bit is set by software and only cleared by hardware after a reset. When WDGA = 1, the watchdog can generate a reset. 0: Watchdog disabled 1: Watchdog enabled 6:0 T[6:0] 7-bit counter (MSB to LSB) These bits contain the decremented value. A reset is produced when it rolls over from 40h to 3Fh (T6 becomes cleared). 1. The WDGA bit is not used if the hardware watchdog option is enabled by option byte. Table 33. Watchdog timer register map and reset values Address (Hex.) 002Eh Register label WDGCR Reset value 7 6 5 4 3 2 1 0 WDGA 0 T6 1 T5 1 T4 1 T3 1 T2 1 T1 1 T0 1 Doc ID 11928 Rev 8 77/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 11.2 Dual 12-bit autoreload timer 3 (AT3) 11.2.1 Introduction The 12-bit autoreload timer can be used for general-purpose timing functions. It is based on one or two free-running 12-bit upcounters with an input capture register and four PWM output channels. There are six external pins: 11.2.2 78/234 4 PWM outputs ATIC/LTIC pin for the input capture function BREAK pin for forcing a break condition on the PWM outputs Main features Single timer or dual timer mode with two 12-bit upcounters (CNTR1/CNTR2) and two 12-bit autoreload registers (ATR1/ATR2) Maskable overflow interrupts PWM mode - Generation of four independent PWMx signals - Dead time generation for half-bridge driving mode with programmable dead time - Frequency 2 kHz to 4 MHz (@ 8 MHz fCPU) - Programmable duty-cycles - Polarity control - Programmable output modes Output compare mode Input capture mode - 12-bit input capture register (ATICR) - Triggered by rising and falling edges - Maskable IC interrupt - Long range input capture Break control Flexible clock control Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 35. Single timer mode (ENCNTR2 = 0) Edge detection circuit 12-bit input capture CMP interrupt Output compare PWM0 duty cycle generator 12-bit autoreload register 1 PWM1 duty cycle generator Clock Control 12-bit upcounter 1 OE0 Dead time generator DTE bit OE2 PWM2 duty cycle generator 1ms from lite timer OE1 PWM0 Break function ATIC PWM1 PWM2 OE3 PWM3 duty cycle generator fCPU PWM3 BPEN bit OVF1 interrupt Figure 36. Dual timer mode (ENCNTR2 = 1) Edge detection circuit 12-bit input capture Output compare 12-bit autoreload register 1 12-bit upcounter 1 PWM0 duty cycle generator PWM1 duty cycle generator OVF1 interrupt OVF2 interrupt Clock control 12-bit upcounter 2 PWM2 duty cycle generator fCPU 1ms PWM3 duty cycle generator CMP interrupt OE0 Dead time generator OE1 DTE bit OE2 PWM0 Break function ATIC OE3 PWM1 PWM2 PWM3 12-bit autoreload register 2 BPEN bit 11.2.3 Functional description PWM mode This mode allows up to four pulse width modulated signals to be generated on the PWMx output pins. PWM frequency Doc ID 11928 Rev 8 79/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 The four PWM signals can have the same frequency (fPWM) or can have two different frequencies. This is selected by the ENCNTR2 bit which enables single timer or dual timer mode (see Figure 35: Single timer mode (ENCNTR2 = 0) on page 79 and Figure 36: Dual timer mode (ENCNTR2 = 1) on page 79). The frequency is controlled by the counter period and the ATR register value. In dual timer mode, PWM2 and PWM3 can be generated with a different frequency controlled by CNTR2 and ATR2. fPWM = fCOUNTER/(4096 - ATR) Following the above formula, if fCOUNTER is 4 MHz, the maximum value of fPWM is 2 MHz (ATR register value = 4094), the minimum value is 1 kHz (ATR register value = 0). Duty cycle The duty cycle is selected by programming the DCRx registers. These are preload registers. The DCRx values are transferred in active duty cycle registers after an overflow event if the corresponding transfer bit (TRANx bit) is set. The TRAN1 bit controls the PWMx outputs driven by counter 1 and the TRAN2 bit controls the PWMx outputs driven by counter 2. PWM generation and output compare are done by comparing these active DCRx values with the counter. The maximum available resolution for the PWMx duty cycle is: Resolution = 1/(4096 - ATR) Where ATR is equal to 0. With this maximum resolution, 0% and 100% duty cycle can be obtained by changing the polarity. At reset, the counter starts counting from 0. When an upcounter overflow occurs (OVF event), the preloaded duty cycle values are transferred to the active duty cycle registers and the PWMx signals are set to a high level. When the upcounter matches the active DCRx value, the PWMx signals are set to a low level. To obtain a signal on a PWMx pin, the contents of the corresponding active DCRx register must be greater than the contents of the ATR register. Note: For ROM devices only: The PWM can be enabled/disabled only in overflow ISR, otherwise the first pulse of PWM can be different from expected one because no force overflow function is present. The maximum value of ATR is 4094 because it must be lower than the DCR value, which in this case must be 4095. Polarity inversion The polarity bits can be used to invert any of the four output signals. The inversion is synchronized with the counter overflow if the corresponding transfer bit in the ATCSR2 register is set (reset value). See Figure 37. 80/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 37. PWM polarity inversion Inverter PWMx pin PWMx PWMxCSR register OPx ATCSR2 register TRANx DFF Counter overflow The data flip flop (DFF) applies the polarity inversion when triggered by the counter overflow input. Output control The PWMx output signals can be enabled or disabled using the OEx bits in the PWMCR register. Figure 38. PWM function 4095 Counter Duty cycle register (DCRx) Autoreload register (ATR) PWMx output 000 t With OE=1 and OPx=0 With OE=1 and OPx=1 Doc ID 11928 Rev 8 81/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Figure 39. PWM signal from 0% to 100%duty cycle fCOUNTER ATR= FFDh PWMx output With MOD00=1 And OPx=0 DCRx=FFDh PWMx output With MOD00=1 And OPx=1 Counter DCRx=000h FFDh FFEh FFFh FFDh FFEh FFFh FFDh FFEh DCRx=000h DCRx=FFEh t Dead time generation A dead time can be inserted between PWM0 and PWM1 using the DTGR register. This is required for half-bridge driving where PWM signals must not be overlapped. The non-overlapping PWM0/PWM1 signals are generated through a programmable dead time by setting the DTE bit. Dead time value = DT[6:0] x Tcounter1 DTGR[7:0] is buffered inside so as to avoid deforming the current PWM cycle. The DTGR effect will take place only after an overflow. Note: 82/234 1 Dead time is generated only when DTE = 1 and DT[6:0] 0. If DTE is set and DT[6:0] = 0, PWM output signals will be at their reset state. 2 Half-bridge driving is possible only if polarities of PWM0 and PWM1 are not inverted, that is, if OP0 and OP1 are not set. If polarity is inverted, overlapping PWM0/PWM1 signals will be generated. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 40. Dead time generation Tcounter1 CK_CNTR1 CNTR1 DCR0 DCR0+1 OVF ATR1 if DTE = 0 counter = DCR0 PWM 0 counter = DCR1 PWM 1 Tdt if DTE = 1 PWM 0 Tdt PWM 1 Tdt = DT[6:0] x Tcounter1 In the above example, when the DTE bit is set: PWM goes low at DCR0 match and goes high at ATR1 + Tdt PWM1 goes high at DCR0 + Tdt and goes low at ATR match. With this programmable delay (Tdt), the PWM0 and PWM1 signals which are generated are not overlapped. Break function The break function can be used to perform an emergency shutdown of the application being driven by the PWM signals. The break function is activated by the external BREAK pin (active low). In order to use the break pin it must be previously enabled by software setting the BPEN bit in the BREAKCR register. When a low level is detected on the break pin, the BA bit is set and the break function is activated. In this case, the four PWM signals are stopped. Software can set the BA bit to activate the break function without using the break pin. When a break function is activated (BA bit = 1 and BREN1/BREN2 = 1): The break pattern (PWM[3:0] bits in the BREAKCR is forced directly on the PWMx output pins (after the inverter) The 12-bit PWM counter CNTR1 is put to its reset value, that is, 00h The 12-bit PWM counter CNTR2 is put to its reset value, that is 00h ATR1, ATR2, preload and active DCRx are put to their reset values The PWMCR register is reset Counters stop counting Doc ID 11928 Rev 8 83/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 When the break function is deactivated after applying the break (BA bit goes from 1 to 0 by software): The control of the four PWM outputs is transferred to the port registers. Figure 41. Block diagram of break function BREAK pin (active low) BREAKCR register BA BPEN PWM3 PWM2 PWM1 PWM0 1 PWM0 PWM1 PWM2 PWM0 PWM1 PWM3 0 PWM2 PWM3 (Inverters) 1. The BREAK pin value is latched by the BA bit 84/234 Doc ID 11928 Rev 8 When BA is set: PWM counter -> reset value ATRx & DCRx -> reset value PWM Mode -> reset value ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Output compare mode To use this function, load a 12-bit value in the preload DCRxH and DCRxL registers. When the 12-bit upcounter CNTR1 reaches the value stored in the active DCRxH and DCRxL registers, the CMPFx bit in the PWMxCSR register is set and an interrupt request is generated if the CMPIE bit is set. The output compare function is always performed on CNTR1 in both single timer mode and dual timer mode and never on CNTR2. The difference is that in single timer mode the counter 1 can be compared with any of the four DCR registers and in dual timer mode, the counter 1 is compared with DCR0 or DCR1. Note: 1 The output compare function is only available for DCRx values other than 0 (reset value). 2 Duty cycle registers are buffered internally. The CPU writes in preload duty cycle registers and these values are transferred to active duty cycle registers after an overflow event if the corresponding transfer bit (TRAN1 bit) is set. Output compare is done by comparing these active DCRx values with the counter. Figure 42. Block diagram of output compare mode (single timer) DCRx Preload duty cycle regx (ATCSR2) TRAN1 (ATCSR) OVF Active duty cycle regx Output compare circuit CNTR1 Counter 1 CMPFx (PWMxCSR) CMP Interrupt request CMPIE (ATCSR) Doc ID 11928 Rev 8 85/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Input capture mode The 12-bit ATICR register is used to latch the value of the 12-bit free running upcounter CNTR1 after a rising or falling edge is detected on the ATIC pin. When an input capture occurs, the ICF bit is set and the ATICR register contains the value of the free running upcounter. An IC interrupt is generated if the ICIE bit is set. The ICF bit is reset by reading the ATICRH/ATICRL register when the ICF bit is set. The ATICR is a read only register and always contains the free running upcounter value which corresponds to the most recent input capture. Any further input capture is inhibited while the ICF bit is set. Figure 43. Block diagram of input capture mode ATIC 12-bit input capture register ATICR IC interrupt request ATCSR ICF ICIE CK1 CK0 fLTIMER (1 ms timebase @ 8 MHz) 12-bit upcounter1 fCPU CNTR1 Off ATR1 12-bit autoreload register Figure 44. Input capture timing diagram fCOUNTER Counter1 01h 02h 03h 04h 05h 06h 07h 08h 09h 0Ah ATIC pin Interrupt ATICR read Interrupt ICF flag xxh 04h 09h t 86/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Long input capture Pulses that last between 8 s and 2 s can be measured with an accuracy of 4s if fOSC = 8 MHz under the following conditions: The 12-bit AT3 timer is clocked by the lite timer (RTC pulse: CK[1:0] = 01 in the ATCSR register) The ICS bit in the ATCSR2 register is set so that the LTIC pin is used to trigger the AT3 timer capture. The signal to be captured is connected to LTIC pin Input capture registers LTICR, ATICRH and ATICRL are read This configuration allows to cascade the lite timer and the 12-bit AT3 timer to get a 20-bit input capture value. Refer to Figure 45. Figure 45. Long range input capture block diagram LTICR 8 LSB bits 8-bit input capture register fOSC/32 8-bit timebase counter1 Lite timer 20 cascaded bits 12-bit ARTIMER ATR1 12-bit autoreload register fLTIMER ICS fcpu Off LTIC 1 ATIC CNTR1 0 12-bit upcounter1 ATICR 12-bit input capture register 12 MSB bits Since the input capture flags (ICF) for both timers (AT3 timer and LT timer) are set when signal transition occurs, software must mask one interrupt by clearing the corresponding ICIE bit before setting the ICS bit. If the ICS bit changes (from 0 to 1 or from 1 to 0), a spurious transition might occur on the input capture signal because of different values on LTIC and ATIC. To avoid this situation, it is recommended to do the following: First, reset both ICIE bits Then set the ICS bit Reset both ICF bits Then set the ICIE bit of desired interrupt Doc ID 11928 Rev 8 87/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Both timers are used to compute a pulse length with long input capture feature. The procedure is not straight-forward and is as follows: At the first input capture on the rising edge of the pulse, we assume that values in the registers are as follows: - LTICR = LT1 - ATICRH = ATH1 - ATICRL = ATL1 - Hence ATICR1 [11:0] = ATH1 & ATL1 - Refer to Figure 46. At the second input capture on the falling edge of the pulse, we assume that the values in the registers are as follows: - LTICR = LT2 - ATICRH = ATH2 - ATICRL = ATL2 - Hence ATICR2 [11:0] = ATH2 & ATL2 Now pulse width P between first capture and second capture is: P = decimal (F9 - LT1 + LT2 + 1) * 0.004ms + decimal (ATICR2 - ATICR1 - 1) * 1ms Figure 46. Long range input capture timing diagram fOSC/32 TB counter1 F9h 00h ___ CNTR1 LT1 F9h 00h ___ ___ ___ ATH1 & ATL1 ___ LT2 ___ ___ ATH2 & ATL2 LTIC LTICR 00h LT1 LT2 ATICRH 0h ATH1 ATH2 ATICRL 00h ATL1 ATL2 ATICR = ATICRH[3:0] & ATICRL[7:0] 11.2.4 Low power modes Table 34. Effect of low power modes on AT3 timer Mode 88/234 Description Slow The input frequency is divided by 32 Wait No effect on AT timer Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 34. 11.2.5 On-chip peripherals Effect of low power modes on AT3 timer (continued) Active halt AT timer halted except if CK0 = 1, CK1 = 0 and OVFIE = 1 Halt AT timer halted Interrupts Table 35. AT3 interrupt control/wake-up capability Interrupt event(1) Event flag Enable control bit Overflow event OVF1 OVFIE1 AT3 IC event ICF ICIE CMP event CMPFx CMPIE Exit from wait Exit from Halt Exit from active halt Yes(2) Yes No No 1. The CMP and AT3 IC events are connected to the same interrupt vector. The OVF event is mapped on a separate vector (see Section 8: Interrupts). 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). 2. Only if CK0 = 1 and CK1 = 0 (fCOUNTER = fLTIMER) 11.2.6 Register description Timer control status register (ATCSR) ATCSR Reset value: 0x00 0000 (x0h) 7 6 5 Reserved ICF ICIE - R/W R/W Table 36. Bit name 7 - 5 3 2 1 0 CK[1:0] OVF1 OVFIE1 CMPIE R/W R/W R/W R/W ATCSR register description Bit 6 4 Function Reserved, must be kept cleared ICF Input capture flag This bit is set by hardware and cleared by software by reading the ATICR register (a read access to ATICRH or ATICRL clears this flag). Writing to this bit does not change the bit value. 0: No input capture 1: An input capture has occurred ICIE IC interrupt enable This bit is set and cleared by software. 0: Input capture interrupt disabled 1: Input capture interrupt enabled Doc ID 11928 Rev 8 89/234 On-chip peripherals Table 36. Bit 4:3 ST7L34 ST7L35 ST7L38 ST7L39 ATCSR register description (continued) Bit name Function 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 as follows/ 00: Counter clock selection = off 01: Counter clock selection = fLTIMER (1ms timebase @ 8 MHz) 10: Counter clock selection = fCPU 11: Counter clock selection = off OVF1 Overflow flag This bit is set by hardware and cleared by software by reading the TCSR register. It indicates the transition of the counter1 CNTR1 from FFh to ATR1 value. 0: No counter overflow occurred 1: Counter overflow occurred 2 1 0 OVFIE1 Overflow interrupt enable This bit is read/write by software and cleared by hardware after a reset. 0: Overflow interrupt disabled 1: Overflow interrupt enabled CMPIE Compare interrupt enable This bit is read/write by software and cleared by hardware after a reset. It can be used to mask the interrupt generated when any of the CMPFx bit is set. 0: Output compare interrupt disabled 1: Output compare interrupt enabled Counter register 1 high (CNTR1H) CNTR1H Reset value: 0000 0000 (00h) 15 14 13 12 11 10 9 Reserved Reserved Reserved Reserved CNTR1[11:8] - - - - R 8 Counter register 1 low (CNTR1L) CNTR1L 7 Reset value: 0000 0000 (00h) 6 5 4 3 CNTR1[7:0] R 90/234 Doc ID 11928 Rev 8 2 1 0 ST7L34 ST7L35 ST7L38 ST7L39 Table 37. CNTR1H and CNTR1L register descriptions Bit Bit name 15:12 - 11:0 On-chip peripherals Function Reserved, must be kept cleared Counter value This 12-bit register is read by software and cleared by hardware after a reset. The counter CNTR1 increments 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. The CNTR1[11:0] CNTR1H register can be incremented between the two reads, and in order to be accurate when fTIMER = fCPU, the software should take this into account when CNTR1L and CNTR1H are read. If CNTR1L is close to its highest value, CNTR1H could be incremented before it is read. When a counter overflow occurs, the counter restarts from the value specified in the ATR1 register. Doc ID 11928 Rev 8 91/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Autoreload register high (ATR1H) ATR1H Reset value: 0000 0000 (00h) 15 14 13 12 11 10 9 Reserved Reserved Reserved Reserved ATR1[11:8] - - - - R/W 8 Autoreload register low (ATR1L) ATR1L 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 ATR1[7:0] R/W Table 38. ATR1H and ATR1L register descriptions Bit Bit name 15:12 - 11:0 Function Reserved, must be kept cleared ATR1[11:0] Autoreload register 1 This is a 12-bit register which is written by software. The ATR1 register value is automatically loaded into the upcounter CNTR1 when an overflow occurs. The register value is used to set the PWM frequency. PWM output control register (PWMCR) PWMCR 7 6 5 4 3 2 1 0 Reserved OE3 Reserved OE2 Reserved OE1 Reserved OE0 - R/W - R/W - R/W - R/W Table 39. PWMCR register description Bit Bit name 7, 5, 3, 1 - 6, 4, 2, 0 92/234 Reset value: 0000 0000 (00h) OE[3:0] Function Reserved, must be kept cleared PWMx output enable These bits are set and cleared by software and cleared by hardware after a reset. 0: PWM mode disabled. PWMx output alternate function disabled (I/O pin free for general purpose I/O) 1: PWM mode enabled Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals PWMx control status register (PWMxCSR) PWMxCSR Reset value: 0000 0000 (00h) 7 6 5 4 3 2 1 0 Reserved Reserved Reserved Reserved Reserved Reserved OPx CMPFx - - - - - - R/W R/W Table 40. PWMxCSR register description Bit Bit name 7:2 - 1 0 Function Reserved, must be kept cleared OPx PWMx output polarity This bit is read/write by software and cleared by hardware after a reset. This bit selects the polarity of the PWM signal. 0: The PWM signal is not inverted 1: The PWM signal is inverted CMPFx PWMx compare flag This bit is set by hardware and cleared by software by reading the PWMxCSR register. It indicates that the upcounter value matches the active DCRx register value. 0: Upcounter value does not match DCRx value 1: Upcounter value matches DCRx value Doc ID 11928 Rev 8 93/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Break control register (BREAKCR) BREAKCR 7 6 5 4 Reserved Reserved BA BPEN PWM[3:0] - - R/W R/W R/W Table 41. Bit name 7:6 - 4 3:0 3 2 1 0 BREAKCR register description Bit 5 94/234 Reset value: 0000 0000 (00h) BA BPEN PWM[3:0] Function Reserved, must be kept cleared Break active This bit is read/write by software, cleared by hardware after reset and set by hardware when the break pin is low. It activates/deactivates the break function. 0: Break not active 1: Break active Break pin enable This bit is read/write by software and cleared by hardware after reset. 0: Break pin disabled 1: Break pin enabled Break pattern These bits are read/write by software and cleared by hardware after a reset. They are used to force the four PWMx output signals into a stable state when the break function is active and corresponding OEx bit is set. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals PWMx duty cycle register high (DCRxH) DCRxH Reset value: 0000 0000 (00h) 15 14 13 12 11 10 9 Reserved Reserved Reserved Reserved DCRx[11:8] - - - - R/W 8 PWMx duty cycle register low (DCRxL) DCRxL 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 DCRx[7:0] R/W Table 42. DCRxH and DCRxL register descriptions Bit Bit name 15:12 - 11:0 DCRx[11:0] Function Reserved, must be kept cleared PWMx duty cycle value This 12-bit value is written by software. It defines the duty cycle of the corresponding PWM output signal (see Figure 38: PWM function on page 81). In PWM mode (OEx = 1 in the PWMCR register) the DCRx[11:0] bits define the duty cycle of the PWMx output signal (see Figure 38). In output compare mode, they define the value to be compared with the 12-bit upcounter value. Doc ID 11928 Rev 8 95/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Input capture register high (ATICRH) ATICRH Reset value: 0000 0000 (00h) 15 14 13 12 11 10 9 Reserved Reserved Reserved Reserved ICR[11:8] - - - - R 8 Input capture register low (ATICRL) ATICRL 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 ICR[7:0] R Table 43. Bit Bit name 15:12 - 11:0 96/234 ATICRH and ATICRL register descriptions ICR[11:0] Function Reserved, must be kept cleared Input capture data This is a 12-bit register which is readable by software and cleared by hardware after a reset. The ATICR register contains the captured value of the 12-bit CNTR1 register when a rising or falling edge occurs on the ATIC or LTIC pin (depending on ICS). Capture will only be performed when the ICF flag is cleared. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Timer control register2 (ATCSR2) ATCSR2 Reset value: 0000 0011 (03h) 7 6 5 4 3 2 1 0 Reserved Reserved ICS OVFIE2 OVF2 ENCNTR2 TRAN2 TRAN1 - - R/W R/W R/W R/W R/W R/W Table 44. ATCSR2 register description Bit Bit name 7:6 - 5 4 3 2 1 ICS Function Reserved, must be kept cleared Input capture shorted This bit is read/write by software. It allows the AT timer CNTR1 to use the LTIC pin for long input capture. 0: ATIC for CNTR1 input capture 1: LTIC for CNTR1 input capture OVFIE2 Overflow interrupt 2 enable This bit is read/write by software and controls the overflow interrupt of counter 2. 0: Overflow interrupt disabled 1: Overflow interrupt enabled OVF2 Overflow flag This bit is set by hardware and cleared by software by reading the ATCSR2 register. It indicates the transition of the counter 2 from FFFh to ATR2 value. 0: No counter overflow occurred 1: Counter overflow occurred ENCNTR2 TRAN2 Enable counter 2 This bit is read/write by software and switches the second counter CNTR2. If this bit is set, PWM2/3 is generated using CNTR2 0: CNTR2 stopped 1: CNTR2 starts running Transfer enable 2 This bit is read/write by software, cleared by hardware after each completed transfer and set by hardware after reset. It controls the transfers on CNTR2. It allows the value of the preload DCRx registers to be transferred to the active DCRx registers after the next overflow event. The OPx bits are transferred to the shadow OPx bits in the same way. Note: Only DCR2/3 can be controlled using this bit Doc ID 11928 Rev 8 97/234 On-chip peripherals Table 44. Bit 0 ST7L34 ST7L35 ST7L38 ST7L39 ATCSR2 register description (continued) Bit name Function Transfer enable 1 This bit is read/write by software, cleared by hardware after each completed transfer and set by hardware after reset. It controls the transfers on CNTR1. It allows the value of the preload DCRx registers to be transferred to the active DCRx registers after the next overflow event. The OPx bits are transferred to the shadow OPx bits in the same way. TRAN1 Autoreload register2 high (ATR2H) ATR2H Reset value: 0000 0000 (00h) 15 14 13 12 11 10 9 Reserved Reserved Reserved Reserved ATR2[11:8] - - - - R/W 8 Autoreload register2 low (ATR2L) ATR2L 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 ATR2[7:0] R/W Table 45. ATR2H and ATR2L register descriptions Bit Bit name 15:12 - 11:0 ATR2[11:0] Function Reserved, must be kept cleared Autoreload register 2 This is a 12-bit register which is written by software. The ATR2 register value is automatically loaded into the upcounter CNTR2 when an overflow of CNTR2 occurs. The register value is used to set the PWM2/PWM3 frequency when ENCNTR2 is set. Dead time generator register (DTGR) DTGR 7 98/234 Reset value: 0000 0000 (00h) 6 5 4 3 DTE DT[6:0] R/W R/W Doc ID 11928 Rev 8 2 1 0 ST7L34 ST7L35 ST7L38 ST7L39 Table 46. Bit 7 6:0 On-chip peripherals DTGR register description Bit name Function DTE Dead time enable This bit is read/write by software. It enables a dead time generation on PWM0/PWM1. 0: No dead time insertion 1: Dead time insertion enabled DT[6:0] Dead time value These bits are read/write by software. They define the dead time inserted between PWM0/PWM1. Dead time is calculated as follows: Dead time = DT[6:0] x Tcounter1 Doc ID 11928 Rev 8 99/234 On-chip peripherals Table 47. ST7L34 ST7L35 ST7L38 ST7L39 Register map and reset values Add (Hex.) Register label 7 6 5 4 3 2 1 0 0D ATCSR Reset value 0 ICF 0 ICIE 0 CK1 0 CK0 0 OVF1 0 OVFIE1 0 CMPIE 0 0E CNTR1H Reset value 0 0 0 0 0F CNTR1L CNTR1_7 CNTR1_6 CNTR1_5 CNTR1_4 Reset value 0 0 0 0 10 ATR1H Reset value 0 0 0 11 ATR1L Reset value ATR7 0 ATR6 0 12 PWMCR Reset value 0 13 PWM0CSR Reset value 14 CNTR1_11 CNTR1_10 CNTR1_9 CNTR1_8 0 0 0 0 CNTR1_3 0 CNTR1_2 0 0 ATR11 0 ATR10 0 ATR9 0 ATR8 0 ATR5 0 ATR4 0 ATR3 0 ATR2 0 ATR1 0 ATR0 0 OE3 0 0 OE2 0 0 OE1 0 0 OE0 0 0 0 0 0 0 0 OP0 0 CMPF0 0 PWM1CSR Reset value 0 0 0 0 0 0 OP1 0 CMPF1 0 15 PWM2CSR Reset value 0 0 0 0 0 0 OP2 0 CMPF2 0 16 PWM3CSR Reset value 0 0 0 0 0 0 OP3 0 CMPF3 0 17 DCR0H Reset value 0 0 0 0 DCR11 0 DCR10 0 DCR9 0 DCR8 0 18 DCR0L Reset value DCR7 0 DCR6 0 DCR5 0 DCR4 0 DCR3 0 DCR2 0 DCR1 0 DCR0 0 19 DCR1H Reset value 0 0 0 0 DCR11 0 DCR10 0 DCR9 0 DCR8 0 1A DCR1L Reset value DCR7 0 DCR6 0 DCR5 0 DCR4 0 DCR3 0 DCR2 0 DCR1 0 DCR0 0 1B DCR2H Reset value 0 0 0 0 DCR11 0 DCR10 0 DCR9 0 DCR8 0 1C DCR2L Reset value DCR7 0 DCR6 0 DCR5 0 DCR4 0 DCR3 0 DCR2 0 DCR1 0 DCR0 0 1D DCR3H Reset value 0 0 0 0 DCR11 0 DCR10 0 DCR9 0 DCR8 0 1E DCR3L Reset value DCR7 0 DCR6 0 DCR5 0 DCR4 0 DCR3 0 DCR2 0 DCR1 0 DCR0 0 1F ATICRH Reset value 0 0 0 0 ICR11 0 ICR10 0 ICR9 0 ICR8 0 20 ATICRL Reset value ICR7 0 ICR6 0 ICR5 0 ICR4 0 ICR3 0 ICR2 0 ICR1 0 ICR0 0 21 ATCSR2 Reset value 0 0 ICS 0 OVFIE2 0 OVF2 0 ENCNTR2 0 TRAN2 1 TRAN1 1 100/234 Doc ID 11928 Rev 8 CNTR1_1 CNTR1_0 0 0 ST7L34 ST7L35 ST7L38 ST7L39 Table 47. On-chip peripherals Register map and reset values (continued) Add (Hex.) Register label 7 6 5 4 3 2 1 0 22 BREAKCR Reset value 0 0 BA 0 BPEN 0 PWM3 0 PWM2 0 PWM1 0 PWM0 0 23 ATR2H Reset value 0 0 0 0 ATR11 0 ATR10 0 ATR9 0 ATR8 0 24 ATR2L Reset value ATR7 0 ATR6 0 ATR5 0 ATR4 0 ATR3 0 ATR2 0 ATR1 0 ATR0 0 25 DTGR Reset value DTE 0 DT6 0 DT5 0 DT4 0 DT3 0 DT2 0 DT1 0 DT0 0 11.3 Lite timer 2 (LT2) 11.3.1 Introduction The lite timer is used for general-purpose timing functions. It is based on two free-running 8-bit upcounters and an 8-bit input capture register. 11.3.2 Main features Real-time clock (RTC) - One 8-bit upcounter 1 ms or 2 ms timebase period (@ 8 MHz fOSC) - One 8-bit upcounter with autoreload and programmable timebase period from 4s to 1.024ms in 4s increments (@ 8 MHz fOSC) - 2 maskable timebase interrupts Input capture - 8-bit input capture register (LTICR) - Maskable interrupt with wakeup from halt mode capability Doc ID 11928 Rev 8 101/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Figure 47. Lite timer 2 block diagram fOSC/32 LTTB2 LTCNTR Interrupt request LTCSR2 8-bit timebase counter 2 0 0 0 0 0 0 TB2IE TB2F 8 LTARR fLTIMER 8-bit autoreload register /2 8-bit timebase counter 1 fLTIMER To 12-bit AT timer 1 0 Timebase 1 or 2 ms (@ 8 MHz fOSC) 8 LTICR LTIC 8-bit input capture register LTCSR1 ICIE ICF TB TB1IE TB1F LTTB1 interrupt request LTIC interrupt request 102/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 11.3.3 On-chip peripherals Functional description Timebase counter 1 The 8-bit value of counter 1 cannot be read or written by software. After an MCU reset, it starts incrementing from 0 at a frequency of fOSC/32. An 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 LTCSR1 register. When counter 1 overflows, the TB1F bit is set by hardware and an interrupt request is generated if the TB1IE bit is set. The TB1F bit is cleared by software reading the LTCSR1 register. Timebase counter 2 Counter 2 is an 8-bit autoreload upcounter. It can be read by accessing the LTCNTR register. After an MCU reset, it increments at a frequency of fOSC/32 starting from the value stored in the LTARR register. A counter overflow event occurs when the counter rolls over from FFh to the LTARR reload value. Software can write a new value at anytime in the LTARR register, this value will be automatically loaded in the counter when the next overflow occurs. When counter 2 overflows, the TB2F bit in the LTCSR2 register is set by hardware and an interrupt request is generated if the TB2IE bit is set. The TB2F bit is cleared by software reading the LTCSR2 register. Input capture The 8-bit input capture register is used to latch the free-running upcounter (counter 1) 1 after a rising or falling edge is detected on the LTIC pin. When an input capture occurs, the ICF bit is set and the LTICR register contains the value of counter 1. 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. Figure 48. Input capture timing diagram 4s (@ 8 MHz fOSC) fCPU fOSC/32 8-bit counter 1 01h 02h 03h 04h 05h 06h 07h Cleared by S/W reading LTIC register LTIC pin ICF flag LTICR register xxh 04h 07h t Doc ID 11928 Rev 8 103/234 On-chip peripherals 11.3.4 ST7L34 ST7L35 ST7L38 ST7L39 Low power modes Table 48. Effect of low power modes on lite timer 2 Mode Description No effect on lite timer (this peripheral is driven directly by fOSC/32) Slow Wait No effect on lite timer Active halt Halt Table 49. Lite timer stops counting Lite timer 2 interrupt control/wake-up capability(1) Interrupt event Event flag Enable control bit Exit from wait Timebase 1 event TB1F TB1IE Timebase 2 event TB2F TB2IE Exit from active halt Exit from halt Yes Yes No No IC event ICF ICIE 1. The TBxF and ICF interrupt events are connected to separate interrupt vectors (see Section 8: Interrupts). They generate an interrupt if the enable bit is set in the LTCSR1 or LTCSR2 register and the interrupt mask in the CC register is reset (RIM instruction). 104/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 11.3.5 On-chip peripherals Register description Lite timer control/status register 2 (LTCSR2) LTCSR2 Reset value: 0x00 0000 (x0h) 7 6 5 4 3 2 1 0 Reserved Reserved Reserved Reserved Reserved Reserved TB2IE TB2F - - - - - - R/W R/W Table 50. LTCSR2 register description Bit Bit name 7:2 - 1 Function Reserved, must be kept cleared TB2IE Timebase 2 interrupt enable This bit is set and cleared by software. 0: Timebase (TB2) interrupt disabled 1: Timebase (TB2) interrupt enabled TB2F Timebase 2 interrupt flag This bit is set by hardware and cleared by software reading the LTCSR register. Writing to this bit has no effect. 0: No counter 2 overflow 1: A counter 2 overflow has occurred 0 Lite timer autoreload register (LTARR) LTARR 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 AR[7:0] R/W Table 51. Bit 7:0 LTARR register description Bit name AR[7:0] Function Counter 2 reload value These bits are read/write by software. The LTARR value is automatically loaded into counter 2 (LTCNTR) when an overflow occurs. Doc ID 11928 Rev 8 105/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Lite timer counter 2 (LTCNTR) LTCNTR 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 CNT[7:0] R Table 52. LTCNTR register description Bit Bit name 7:0 CNT[7:0] Function Counter 2 reload value This register is read by software. The LTARR value is automatically loaded into counter 2 (LTCNTR) when an overflow occurs. Lite timer control/status register (LTCSR1) LTCSR1 7 6 5 4 3 2 1 0 ICIE ICF TB TB1IE TB1F Reserved Reserved Reserved R/W R/W R/W R/W R/W - - - Table 53. Bit 7 6 5 4 106/234 Reset value: 0x00 0000 (x0h) LTCSR1 register description Bit name Function ICIE Interrupt enable This bit is set and cleared by software. 0: Input capture (IC) interrupt disabled 1: Input capture (IC) interrupt enabled 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 initialize the ICF bit by reading the LTICR register 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) TB1IE Timebase interrupt enable This bit is set and cleared by software. 0: Timebase (TB1) interrupt disabled 1: Timebase (TB1) interrupt enabled Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 53. Bit On-chip peripherals LTCSR1 register description (continued) Bit name 3 TB1F 2:0 - Function Timebase interrupt flag This bit is set by hardware and cleared by software reading the LTCSR register. Writing to this bit has no effect. 0: No counter overflow 1: A counter overflow has occurred Reserved, must be kept cleared Lite timer input capture register (LTICR) LTICR 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 ICR[7:0] R Table 54. Bit 7:0 Table 55. LTICR register description Bit name Function 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 upcounter is captured when a rising or falling edge occurs on the LTIC pin. Lite timer register map and reset values Address (Hex.) Register label 08 7 6 5 4 3 2 1 0 LTCSR2 Reset value 0 0 0 0 0 0 TB2IE 0 TB2F 0 09 LTARR Reset value AR7 0 AR6 0 AR5 0 AR4 0 AR3 0 AR2 0 AR1 0 AR0 0 0A LTCNTR Reset value CNT7 0 CNT6 0 CNT5 0 CNT4 0 CNT3 0 CNT2 0 CNT1 0 CNT0 0 0B LTCSR1 Reset value ICIE 0 ICF x TB 0 TB1IE 0 TB1F 0 0 0 0 0C LTICR Reset value ICR7 0 ICR6 0 ICR5 0 ICR4 0 ICR3 0 ICR2 0 ICR1 0 ICR0 0 Doc ID 11928 Rev 8 107/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 11.4 Serial peripheral interface (SPI) 11.4.1 Introduction The serial peripheral interface (SPI) allows full-duplex, synchronous, serial communication with external devices. An SPI system may consist of a master and one or more slaves or a system in which devices may be either masters or slaves. 11.4.2 Main features Full duplex synchronous transfers (on three lines) Simplex synchronous transfers (on two lines) Master or slave operation 6 master mode frequencies (fCPU/4 max.) fCPU/2 max. slave mode frequency (see note below) SS management by software or hardware Programmable clock polarity and phase End of transfer interrupt flag Write collision, master mode fault and overrun flags Note: In slave mode, continuous transmission is not possible at maximum frequency due to the software overhead for clearing status flags and to initiate the next transmission sequence. 11.4.3 General description Figure 49: Serial peripheral interface block diagram on page 109 shows the serial peripheral interface (SPI) block diagram. There are three registers: - SPI control register (SPICR) - SPI control/status register (SPICSR) - SPI data register (SPIDR) The SPI is connected to external devices through four pins: 108/234 - 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 device. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 49. Serial peripheral interface block diagram Data/address bus SPIDR Read Interrupt request Read buffer MOSI MISO 7 8-bit shift register SPICSR SPIF WCOL OVR MODF SOD bit 0 SOD SSM 0 SSI Write 1 SS SPI state control SCK SPICR 7 SPIE 0 SPE 0 SPR2 MSTR CPOL CPHA SPR1 SPR0 Master control Serial clock generator SS Functional description A basic example of interconnections between a single master and a single slave is illustrated in Figure 50: Single master/single slave application on page 110. The MOSI pins are connected together and the MISO pins are connected together. In this way data are 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 responds 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 53: Data clock timing diagram on page 114) but master and slave must be programmed with the same timing mode. Doc ID 11928 Rev 8 109/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Figure 50. Single master/single slave application Master MSbit Slave LSbit 8-bit shift register SPI clock generator MSbit MISO MISO MOSI MOSI SCK SS LSbit 8-bit shift register SCK +5 V SS Not used if SS is managed by software 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 52: Hardware/software slave select management on page 111). 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 51: Generic SS timing diagram on page 111): If CPHA = 1 (data latched on second 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 first clock edge): - 110/234 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 occurs when the slave writes to the shift register (see Write collision error (WCOL) on page 115). Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 51. Generic SS timing diagram Byte 1 MOSI/MISO Byte 2 Byte 3 Master SS Slave SS (if CPHA = 0) Slave SS (if CPHA = 1) Figure 52. Hardware/software slave select management SSM bit SSI bit SS external pin 1 SS internal 0 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). How to operate the SPI in master mode To operate the SPI in master mode, perform the following steps in order: 1. Note: Write to the SPICR 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 53: Data clock timing diagram on page 114 shows the four possible configurations. The slave must have the same CPOL and CPHA settings as the master 2. Write to the SPICSR register: - 3. Write to the SPICR register: - Note: 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. Set the MSTR and SPE bits 1 MSTR and SPE bits remain set only if SS is high). 2 If the SPICSR register is not written first, the SPICR register setting (MSTR bit) may be not taken into account. The transmit sequence begins when software writes a byte in the SPIDR register. Doc ID 11928 Rev 8 111/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 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: Note: 1. An access to the SPICSR register while the SPIF bit is set 2. A read to the SPIDR register While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR register is read. 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: - Note: Select the clock polarity and clock phase by configuring the CPOL and CPHA bits (see Figure 53: Data clock timing diagram on page 114). The slave must have the same CPOL and CPHA settings as the master. - 2. Manage the SS pin as described in Slave select management on page 110 and Figure 51: Generic SS timing diagram on page 111. 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. Write to the SPICR register to clear the MSTR bit and set the SPE bit to enable the SPI I/O functions. 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: 112/234 1. An access to the SPICSR register while the SPIF bit is set 2. A write or a read to the SPIDR register Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Note: 11.4.4 On-chip peripherals 1 While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR register is read. 2 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 Overrun condition (OVR) on page 115). Clock phase and clock polarity Four possible timing relationships may be chosen by software, using the CPOL and CPHA bits (see Figure 53: Data clock timing diagram on page 114). 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 53: Data clock timing diagram on page 114 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 and 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. Doc ID 11928 Rev 8 113/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Figure 53. Data clock timing diagram CPHA = 1 SCK (CPOL = 1) SCK (CPOL = 0) MISO (from master) MSbit Bit 6 Bit 5 Bit 4 Bit3 Bit 2 Bit 1 MOSI (from slave) MSbit Bit 6 Bit 5 Bit 4 Bit3 Bit 2 Bit 1 LSbit LSbit SS (to slave) Capture strobe CPHA = 0 SCK (CPOL = 1) SCK (CPOL = 0) MISO (from master) MOSI (from slave) MSbit MSbit Bit 6 Bit 5 Bit 4 Bit3 Bit 2 Bit 1 LSbit Bit 6 Bit 5 Bit 4 Bit3 Bit 2 Bit 1 LSbit SS (to slave) Capture strobe 1. This figure should not be used as a replacement for parametric information. Refer to Section 13: Electrical characteristics. 114/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 11.4.5 On-chip peripherals Error flags Master mode fault (MODF) Master mode fault occurs when the master device's SS pin is 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: Note: 1. A read access to the SPICSR register while the MODF bit is set. 2. A write to the SPICR register. 1 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. 2 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. 3 In a slave device, the MODF bit can not be set, but in a multimaster configuration the device can be in slave mode with the MODF bit set. 4 The MODF bit indicates that there might have been a multimaster conflict and allows software to handle this using an interrupt routine and either perform a reset or return to an application default state. 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. 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 Slave select management on page 110. 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 CPU 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). Doc ID 11928 Rev 8 115/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Clearing the WCOL bit is done through a software sequence (see Figure 54). Figure 54. 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 Read SPICSR Result 2nd step 1. Read SPIDR WCOL = 0 Writing to the SPIDR register instead of reading it does not reset the WCOL bit. Single master and multimaster configurations There are two types of SPI systems: Single master system Multimaster system Single Master System A typical single master system may be configured using a device as the master and four devices as slaves (see Figure 55: Single master/multiple slave configuration on page 117). 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. Multimaster system A multimaster system may also be configured by the user. Transfer of master control could be implemented using a handshake method through the I/O ports or by an exchange of code messages through the serial peripheral interface system. The multimaster system is principally handled by the MSTR bit in the SPICR register and the MODF bit in the SPICSR register. 116/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 55. Single master/multiple slave configuration SS SS SCK SCK Slave device MOSI MISO MOSI MISO Slave device MOSI SS SCK MISO SS SCK Slave device MOSI MISO Slave device MOSI MISO Master device 5V 11.4.6 Ports SCK SS Low power modes Table 56. Effect of low power modes on SPI Mode Description Wait No effect on SPI SPI interrupt events cause the device to exit from wait mode. Halt SPI registers are frozen In halt mode, the SPI is inactive. SPI operation resumes when the device 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. Using the SPI to wake up the device from halt mode In slave configuration, the SPI is able to wake up the 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 SPI exits from slave mode, it returns to normal state immediately. Caution: The SPI can wake up the device from halt mode only if the slave select signal (external SS pin or the SSI bit in the SPICSR register) is low when the device enters halt mode. So, if slave selection is configured as external (see Slave select management on page 110), make sure the master drives a low level on the SS pin when the slave enters halt mode. Doc ID 11928 Rev 8 117/234 On-chip peripherals 11.4.7 ST7L34 ST7L35 ST7L38 ST7L39 Interrupts Table 57. SPI interrupt control/wake-up capability(1) Interrupt event Event flag SPI end of transfer event SPIF Master mode fault event MODF Enable control bit Exit from wait Exit from halt Yes SPIE Yes No Overrun error OVR 1. The SPI interrupt events are connected to the same interrupt vector (see Section 8: Interrupts). They generate an interrupt if the corresponding enable control bit is set and the interrupt mask in the CC register is reset (RIM instruction). 11.4.8 Register description SPI control register (SPICR) SPICR 7 6 5 4 3 2 SPIE SPE SPR2 MSTR CPOL CPHA SPR[1:0] R/W R/W R/W R/W R/W R/W R/W Table 58. Bit 7 6 5 118/234 Reset value: 0000 xxxx (0xh) 1 0 SPICR register description Bit name Function SPIE Serial peripheral interrupt enable This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SPI interrupt is generated whenever an end of transfer event, master mode fault or overrun error occurs (SPIF = 1, MODF = 1 or OVR = 1 in the SPICSR register) 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 Master mode fault (MODF) on page 115). 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 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 (see bits [1:0] below). 0: Divider by 2 enabled 1: Divider by 2 disabled Note: The SPR2 bit has no effect in slave mode Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 58. Bit 4 3 2 1:0 On-chip peripherals SPICR register description (continued) Bit name Function MSTR Master mode This bit is set and cleared by software. It is also cleared by hardware when, in master mode, SS = 0 (see Master mode fault (MODF) on page 115). 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. 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. 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. 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: 100: serial clock = fCPU/4 000: serial clock = fCPU/8 001: serial clock = fCPU/16 110: serial clock = fCPU/32 010: serial clock = fCPU/64 011: serial clock = fCPU/128 Note: These 2 bits have no effect in slave mode. Doc ID 11928 Rev 8 119/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 SPI control/status register (SPICSR) SPICSR 7 6 5 4 3 2 1 0 SPIF WCOL OVR MODF Reserved SOD SSM SSI R R R R - R/W R/W R/W Table 59. Bit SPICSR register description Bit name Function SPIF Serial peripheral data transfer flag 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. WCOL Write collision status This bit is set by hardware when a write to the SPIDR register is made during a transmit sequence. It is cleared by a software sequence (see Figure 54: Clearing the WCOL bit (write collision flag) software sequence on page 116). 0: No write collision occurred 1: A write collision has been detected OVR SPI overrun error 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 Overrun condition (OVR) on page 115). An interrupt is generated if SPIE = 1 in SPICR register. The OVR bit is cleared by software reading the SPICSR register. 0: No overrun error 1: Overrun error detected 4 MODF Mode fault flag This bit is set by hardware when the SS pin is pulled low in master mode (see Master mode fault (MODF) on page 115). An SPI interrupt can be generated if SPIE = 1 in the SPICR 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 3 - 7 6 5 120/234 Reset value: 0000 0000 (00h) Reserved, must be kept cleared. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 59. Bit On-chip peripherals SPICSR register description (continued) Bit name Function 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 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 Slave select management on page 110. 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) 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 2 1 0 SPI data I/O register (SPIDR) SPIDR 7 Reset value: undefined 6 5 4 3 2 1 0 D[7:0] R/W The SPIDR register is used to transmit and receive data on the serial bus. In a master device, a write to this register initiates transmission/reception of another byte. Note: 1 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. 2 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 49: Serial peripheral interface block diagram on page 109). Doc ID 11928 Rev 8 121/234 On-chip peripherals Table 60. ST7L34 ST7L35 ST7L38 ST7L39 SPI register map and reset values Address (Hex.) Register label 7 6 5 4 3 2 1 0 x x x x x LSB x 0031h SPIDR Reset Value MSB x x 0032h SPICR Reset Value SPIE 0 SPE 0 0033h SPICSR Reset Value SPIF WCOL 0 0 SPR2 MSTR CPOL CPHA SPR1 0 0 x x x OVR 0 MODF 0 0 SOD 0 SPR0 x SSM 0 11.5 LINSCI serial communication interface (LIN master/slave) 11.5.1 Introduction SSI 0 The serial communications interface (SCI) offers a flexible means of full-duplex data exchange with external equipment requiring an industry standard NRZ asynchronous serial data format. The SCI offers a very wide range of baud rates using two baud rate generator systems. The LIN-dedicated features support the LIN (local interconnect network) protocol for both master and slave nodes. This chapter is divided into SCI Mode and LIN mode sections. For information on general SCI communications, refer to the SCI mode section. For LIN applications, refer to both the SCI mode and LIN mode sections. 122/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 11.5.2 SCI features Full duplex, asynchronous communications NRZ standard format (mark/space) Independently programmable transmit and receive baud rates up to 500 K baud Programmable data word length (8 or 9 bits) Receive buffer full, transmit buffer empty and end of transmission flags 2 receiver wake-up modes: - Address bit (MSB) - Idle line Muting function for multiprocessor configurations Separate enable bits for transmitter and receiver Overrun, noise and frame error detection 6 interrupt sources 11.5.3 On-chip peripherals - Transmit data register empty - Transmission complete - Receive data register full - Idle line received - Overrun error - Parity interrupt Parity control: - Transmits parity bit - Checks parity of received data byte Reduced power consumption mode LIN features LIN master - 13-bit LIN synch break generation LIN slave - Automatic header handling - Automatic baud rate resynchronization based on recognition and measurement of the LIN synch field (for LIN slave nodes) - Automatic baud rate adjustment (at CPU frequency precision) - 11-bit LIN synch break detection capability - LIN Parity check on the LIN identifier field (only in reception) - LIN error management - LIN header timeout - Hot plugging support Doc ID 11928 Rev 8 123/234 On-chip peripherals 11.5.4 ST7L34 ST7L35 ST7L38 ST7L39 General description The interface is externally connected to another device by two pins: TDO: Transmit data output. When the transmitter is disabled, the output pin returns to its I/O port configuration. When the transmitter is enabled and nothing is to be transmitted, the TDO pin is at high level. RDI: Receive data input is the serial data input. Oversampling techniques are used for data recovery by discriminating between valid incoming data and noise. Through these pins, serial data is transmitted and received as characters comprising: An Idle line prior to transmission or reception A start bit A data word (8 or 9 bits) least significant bit first A stop bit indicating that the character is complete This interface uses three types of baud rate generator: 124/234 A conventional type for commonly-used baud rates An extended type with a prescaler offering a very wide range of baud rates even with non-standard oscillator frequencies A LIN baud rate generator with automatic resynchronization Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 56. SCI block diagram (in conventional baud rate generator mode) Write Read (Data register) SCIDR Received data register (RDR) Transmit data register (TDR) TDO Transmit shift register Receive Shift Register RDI R8 Transmit control SCICR2 TIE TC IE T8 SC ID M Wake up unit SCICR1 WA PCE PS PIE KE Receiver control Receiver clock SCISR RIE ILIE TE TD RE RE RW SBK U TC RD ID OR NF FE RF LE LHE PE SCI interrupt control Transmitter clock Transmitter rate control fCPU /16 /PR SC SC SC SC P1 P0 T2 T1 SC T0 SCIBRR SC SC SC R2 R1 R0 Receiver rate control Conventional baud rate generator 11.5.5 SCI mode - functional description Conventional baud rate generator mode The block diagram of the serial control interface in conventional baud rate generator mode is shown in Figure 56. It uses four registers: 2 control registers (SCICR1 and SCICR2) A status register (SCISR) A baud rate register (SCIBRR) Doc ID 11928 Rev 8 125/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Extended prescaler mode Two additional prescalers are available in extended prescaler mode. They are shown in Figure 58: SCI baud rate and extended prescaler block diagram on page 131. An extended prescaler receiver register (SCIERPR) An extended prescaler transmitter register (SCIETPR) Serial data format Word length may be selected as being either 8 or 9 bits by programming the M bit in the SCICR1 register (see Figure 57). The TDO pin is in low state during the start bit. The TDO pin is in high state during the stop bit. An idle character is interpreted as a continuous logic high level for 10 (or 11) full bit times. A break character is a character with a sufficient number of low level bits to break the normal data format followed by an extra "1" bit to acknowledge the start bit. Figure 57. Word length programming 9-bit word length (M bit is set) Possible parity bit Data character Start bit Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Next start bit Stop bit Next data character Start Bit Idle line Extra '1' Break character Start bit 8-bit word length (M bit is reset) Possible parity bit Data character Start bit Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Idle line Break character Bit6 Bit7 Stop bit Next start bit Next data character Start bit Extra '1' Start bit Transmitter The transmitter can send data words of either 8 or 9 bits depending on the M bit status. When the M bit is set, word length is 9 bits and the 9th bit (the MSB) has to be stored in the T8 bit in the SCICR1 register. 126/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Character transmission During an SCI transmission, data shifts out least significant bit first on the TDO pin. In this mode, the SCIDR register consists of a buffer (TDR) between the internal bus and the transmit shift register (see Figure 56). Procedure Select the M bit to define the word length. Select the desired baud rate using the SCIBRR and the SCIETPR registers. Set the TE bit to send a preamble of 10 (M = 0) or 11 (M = 1) consecutive ones (idle line) as first transmission. Access the SCISR register and write the data to send in the SCIDR register (this sequence clears the TDRE bit). Repeat this sequence for each data to be transmitted. Clearing the TDRE bit is always performed by the following software sequence: 1. An access to the SCISR register 2. A write to the SCIDR register The TDRE bit is set by hardware and it indicates: The TDR register is empty The data transfer is beginning The next data can be written in the SCIDR register without overwriting the previous data This flag generates an interrupt if the TIE bit is set and the I[|1:0] bits are cleared in the CCR register. When a transmission is taking place, a write instruction to the SCIDR register stores the data in the TDR register and which is copied in the shift register at the end of the current transmission. When no transmission is taking place, a write instruction to the SCIDR register places the data directly in the shift register, the data transmission starts, and the TDRE bit is immediately set. When a character transmission is complete (after the stop bit) the TC bit is set and an interrupt is generated if the TCIE is set and the I[1:0] bits are cleared in the CCR register. Clearing the TC bit is performed by the following software sequence: Note: 1. An access to the SCISR register 2. A write to the SCIDR register The TDRE and TC bits are cleared by the same software sequence. Break characters Setting the SBK bit loads the shift register with a break character. The break character length depends on the M bit (see Figure 57: Word length programming on page 126). As long as the SBK bit is set, the SCI sends break characters to the TDO pin. After clearing this bit by software, the SCI inserts a logic 1 bit at the end of the last break character to guarantee the recognition of the start bit of the next character. Idle line Setting the TE bit drives the SCI to send a preamble of 10 (M = 0) or 11 (M = 1) consecutive `1's (idle line) before the first character. Doc ID 11928 Rev 8 127/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 In this case, clearing and then setting the TE bit during a transmission sends a preamble (idle line) after the current word. Note that the preamble duration (10 or 11 consecutive `1's depending on the M bit) does not take into account the stop bit of the previous character. Note: Resetting and setting the TE bit causes the data in the TDR register to be lost. Therefore the best time to toggle the TE bit is when the TDRE bit is set, that is, before writing the next byte in the SCIDR. Receiver The SCI can receive data words of either 8 or 9 bits. When the M bit is set, word length is 9 bits and the MSB is stored in the R8 bit in the SCICR1 register. Character reception During a SCI reception, data shifts in least significant bit first through the RDI pin. In this mode, the SCIDR register consists or a buffer (RDR) between the internal bus and the received shift register (see Figure 56: SCI block diagram (in conventional baud rate generator mode) on page 125). Procedure Select the M bit to define the word length. Select the desired baud rate using the SCIBRR and the SCIERPR registers. Set the RE bit, this enables the receiver which begins searching for a start bit. When a character is received: The RDRF bit is set. It indicates that the content of the shift register is transferred to the RDR An interrupt is generated if the RIE bit is set and the I[1:0] bits are cleared in the CCR register The error flags can be set if a frame error, noise or an overrun error has been detected during reception Clearing the RDRF bit is performed by the following software sequence done by: 1. An access to the SCISR register 2. A read to the SCIDR register The RDRF bit must be cleared before the end of the reception of the next character to avoid an overrun error. Idle line When an idle line is detected, there is the same procedure as a data received character plus an interrupt if the ILIE bit is set and the I[|1:0] bits are cleared in the CCR register. Overrun error An overrun error occurs when a character is received when RDRF has not been reset. Data can not be transferred from the shift register to the TDR register as long as the RDRF bit is not cleared. 128/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals When an overrun error occurs: The OR bit is set The RDR content will not be lost The shift register will be overwritten An interrupt is generated if the RIE bit is set and the I[|1:0] bits are cleared in the CCR register. The OR bit is reset by an access to the SCISR register followed by a SCIDR register read operation. Noise error Oversampling techniques are used for data recovery by discriminating between valid incoming data and noise. When noise is detected in a character: The NF bit is set at the rising edge of the RDRF bit Data is transferred from the Shift register to the SCIDR register No interrupt is generated. However this bit rises at the same time as the RDRF bit which itself generates an interrupt The NF bit is reset by a SCISR register read operation followed by a SCIDR register read operation. Framing error A framing error is detected when: The stop bit is not recognized on reception at the expected time, following either a desynchronization or excessive noise. A break is received When the framing error is detected: the FE bit is set by hardware Data is transferred from the shift register to the SCIDR register No interrupt is generated. However this bit rises at the same time as the RDRF bit which itself generates an interrupt. The FE bit is reset by a SCISR register read operation followed by a SCIDR register read operation. Break character When a break character is received, the SCI handles it as a framing error. To differentiate a break character from a framing error, it is necessary to read the SCIDR. If the received value is 00h, it is a break character. Otherwise it is a framing error. Doc ID 11928 Rev 8 129/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Conventional baud rate generation The baud rates for the receiver and transmitter (Rx and Tx) are set independently and calculated as follows: Tx = fCPU Rx = (16*PR)*TR fCPU (16*PR)*RR where: PR = 1, 3, 4 or 13 (see SCP[1:0] bits) TR = 1, 2, 4, 8, 16, 32, 64,128 (see SCT[2:0] bits) RR = 1, 2, 4, 8, 16, 32, 64,128 (see SCR[2:0] bits) All these bits are in the Baud rate register (SCIBRR) on page 139. Example: If fCPU is 8 MHz (normal mode) and if PR = 13 and TR = RR = 1, the transmit and receive baud rates are 38400 baud. Note: The baud rate registers MUST NOT be changed while the transmitter or the receiver is enabled. Extended baud rate generation The extended prescaler option gives a very fine tuning on the baud rate, using a 255 value prescaler, whereas the conventional baud rate generator retains industry standard software compatibility. The extended baud rate generator block diagram is described in Figure 58: SCI baud rate and extended prescaler block diagram on page 131. The output clock rate sent to the transmitter or to the receiver will be the output from the 16 divider divided by a factor ranging from 1 to 255 set in the SCIERPR or the SCIETPR register. Note: The extended prescaler is activated by setting the SCIETPR or SCIERPR register to a value other than zero. The baud rates are calculated as follows: fCPU fCPU Rx = Tx = 16*ERPR*(PR*RR) 16*ETPR*(PR*TR) where: ETPR = 1, ..., 255 (see SCIETPR register on page 140) ERPR = 1, ..., 255 (see SCIERPR register on page 140) 130/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 58. SCI baud rate and extended prescaler block diagram Extended prescaler transmitter rate control Transmitter clock SCIETPR Extended transmitter prescaler register SCIERPR Extended receiver prescaler register Receiver clock Extended prescaler receiver rate control Extended prescaler fCPU Transmitter rate control /16 /PR SCIBRR SCP1 SCP0 SCT2 SCT1 SCT0 SCR2 SCR1 SCR0 Receiver rate control Conventional baud rate generator Receiver muting and wake-up feature In multiprocessor configurations it is often desirable that only the intended message recipient should actively receive the full message contents, thus reducing redundant SCI service overhead for all non-addressed receivers. The non-addressed devices may be placed in sleep mode by means of the muting function. Doc ID 11928 Rev 8 131/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Setting the RWU bit by software puts the SCI in sleep mode: All the reception status bits cannot be set. All the receive interrupts are inhibited. A muted receiver may be woken up in one of the following ways: by idle line detection if the WAKE bit is reset, by address mark detection if the WAKE bit is set. Idle line detection The receiver wakes up by idle line detection when the receive line has recognized an idle line. Then the RWU bit is reset by hardware but the IDLE bit is not set. This feature is useful in a multiprocessor system when the first characters of the message determine the address and when each message ends by an idle line: As soon as the line becomes idle, every receiver is awakened and the first characters of the message are analysed which indicates the addressed receiver. The receivers which are not addressed set the RWU bit to enter in mute mode. Consequently, they will not read the next characters constituting the next part of the message. At the end of the message, an idle line is sent by the transmitter: this wakes up every receiver which are ready to analyse the addressing characters of the new message. In such a system, the inter-characters space must be smaller than the idle time. Address mark detection The receiver wakes up by address mark detection when it receives a `1' as the most significant bit of a word, thus indicating that the message is an address. The reception of this particular word wakes up the receiver, resets the RWU bit and sets the RDRF bit, which allows the receiver to receive this word normally and to use it as an address word. This feature is useful in a multiprocessor system when the most significant bit of each character (except for the break character) is reserved for address detection. As soon as the receivers receive an address character (most significant bit = '1'), the receivers are woken up. The receivers which are not addressed set RWU bit to enter in mute mode. Consequently, they will not treat the next characters constituting the next part of the message. Parity control Hardware byte parity control (generation of parity bit in transmission and parity checking in reception) can be enabled by setting the PCE bit in the SCICR1 register. Depending on the character format defined by the M bit, the possible SCI character formats are as listed in Table 61. Note: In case of wake-up by an address mark, the MSB bit of the data is taken into account and not the parity bit Table 61. M bit 0 1 Character formats(1) PCE bit 0 Character format | SB | 8 bit data | STB | 1 | SB | 7-bit data | PB | STB | 0 | SB | 9-bit data | STB | 1 | SB | 8-bit data | PB | STB | 1. Legend: SB = start bit, STB = stop bit, PB = parity bit 132/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Even parity The parity bit is calculated to obtain an even number of `1s' inside the character made of the 7 or 8 LSB bits (depending on whether M is equal to 0 or 1) and the parity bit. Example: data = 00110101; 4 bits set => parity bit will be 0 if even parity is selected (PS bit = 0). Odd parity The parity bit is calculated to obtain an odd number of `1s' inside the character made of the 7 or 8 LSB bits (depending on whether M is equal to 0 or 1) and the parity bit. Example: data = 00110101; 4 bits set => parity bit will be 1 if odd parity is selected (PS bit = 1). Transmission mode If the PCE bit is set then the MSB bit of the data written in the data register is not transmitted but is changed by the parity bit. Reception mode If the PCE bit is set then the interface checks if the received data byte has an even number of `1s' if even parity is selected (PS = 0) or an odd number of `1s' if odd parity is selected (PS = 1). If the parity check fails, the PE flag is set in the SCISR register and an interrupt is generated if PCIE is set in the SCICR1 register. 11.5.6 Low power modes Table 62. Effect of low power modes on SCI Mode Description Wait No effect on SCI SCI interrupts cause the device to exit from wait mode SCI registers are frozen Halt 11.5.7 In halt mode, the SCI stops transmitting/receiving until halt mode is exited Interrupts Table 63. SCI interrupt control/wake-up capability Interrupt event Transmit data register empty Transmission complete Received data ready to be read Overrun error or LIN synch error detected Idle line detected Parity error LIN header detection Event flag Enable control bit TDRE TIE TC TCIE Exit from wait Exit from halt Yes No RDRF RIE OR/LHE IDLE ILIE PE PIE LHDF LHIE Doc ID 11928 Rev 8 133/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 The SCI interrupt events are connected to the same interrupt vector (see Section 8: Interrupts). These events generate an interrupt if the corresponding enable control bit is set and the interrupt mask in the CC register is reset (RIM instruction). 11.5.8 SCI mode registers Status register (SCISR) SCISR Reset value: 1100 0000 (C0h) 7 6 5 4 3 2 1 0 TDRE TC RDRF IDLE OR(1) NF(1) FE(1) PE(1) R R R R R R R R 1. This bit has a different function in LIN mode, please refer to the LIN mode register description Table 64. Bit 7 6 5 134/234 SCISR register description Bit name Function TDRE Transmit data register empty This bit is set by hardware when the content of the TDR register has been transferred into the shift register. An interrupt is generated if the TIE bit = 1 in the SCICR2 register. It is cleared by a software sequence (an access to the SCISR register followed by a write to the SCIDR register). 0: Data is not transferred to the shift register 1: Data is transferred to the shift register TC Transmission complete This bit is set by hardware when transmission of a character containing data is complete. An interrupt is generated if TCIE = 1 in the SCICR2 register. It is cleared by a software sequence (an access to the SCISR register followed by a write to the SCIDR register). 0: Transmission is not complete 1: Transmission is complete Note: TC is not set after the transmission of a preamble or a break. RDRF Received data ready flag This bit is set by hardware when the content of the RDR register has been transferred to the SCIDR register. An interrupt is generated if RIE = 1 in the SCICR2 register. It is cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). 0: Data are not received 1: Received data are ready to be read Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 64. Bit 4 3 2 1 0 On-chip peripherals SCISR register description (continued) Bit name Function IDLE Idle line detect This bit is set by hardware when an idle line is detected. An interrupt is generated if the ILIE = 1 in the SCICR2 register. It is cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). 0: No idle line is detected 1: Idle line is detected Note: The IDLE bit is not set again until the RDRF bit is set (i.e. a new idle line occurs). OR Overrun error This bit is set by hardware when the word currently being received in the shift register is ready to be transferred into the RDR register while RDRF = 1. An interrupt is generated if RIE = 1 in the SCICR2 register. It is cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). 0: No overrun error 1: Overrun error is detected Note: When the IDLE bit is set the RDR register content is not lost but the shift register is overwritten. NF Noise flag This bit is set by hardware when noise is detected on a received character. It is cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). 0: No noise is detected 1: Noise is detected Note: The NF bit does not generate an interrupt as it appears at the same time as the RDRF bit which itself generates an interrupt. FE Framing error This bit is set by hardware when a de-synchronization, excessive noise or a break character is detected. It is cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). 0: No framing error is detected 1: Framing error or break character is detected Note: The FE bit does not generate an interrupt as it appears at the same time as the RDRF bit which itself generates an interrupt. If the word currently being transferred causes both frame error and overrun error, it is transferred and only the OR bit is set. PE Parity error This bit is set by hardware when a parity error occurs (if the PCE bit is set) in receiver mode. It is cleared by a software sequence (a read to the status register followed by an access to the SCIDR data register). An interrupt is generated if PIE = 1 in the SCICR1 register. 0: No parity error 1: Parity error Doc ID 11928 Rev 8 135/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Control register 1 (SCICR1) SCICR1 Reset value: x000 0000 (x0h) 7 6 5 4 3 2 1 0 R8 T8 SCID M WAKE PCE(1) PS PIE R/W R/W R/W R/W R/W R/W R/W R/W 1. This bit has a different function in LIN mode, please refer to the LIN mode register description Table 65. Bit Bit name Function 7 R8 Receive data bit 8 This bit is used to store the 9th bit of the received word when M = 1. 6 T8 Transmit data bit 8 This bit is used to store the 9th bit of the transmitted word when M = 1. 5 4 3 2 136/234 SCICR1 register description SCID Disabled for low power consumption When this bit is set the SCI prescalers and outputs are stopped at the end of the current byte transfer in order to reduce power consumption.This bit is set and cleared by software. 0: SCI enabled 1: SCI prescaler and outputs disabled M Word length This bit determines the word length. It is set or cleared by software. 0: 1 Start bit, 8 data bits, 1 stop bit 1: 1 Start bit, 9 data bits, 1 stop bit Note: The M bit must not be modified during a data transfer (both transmission and reception). WAKE Wake up method This bit determines the SCI wake up method, it is set or cleared by software. 0: Idle line 1: Address mark Note: If the LINE bit is set, the WAKE bit is deactivated and replaced by the LHDM bit. PCE Parity control enable This bit is set and cleared by software. It selects the hardware parity control (generation and detection for byte parity, detection only for LIN parity). 0: Parity control disabled 1: Parity control enabled Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 65. Bit On-chip peripherals SCICR1 register description (continued) Bit name Function PS Parity selection This bit selects the odd or even parity when the parity generation/detection is enabled (PCE bit set). It is set and cleared by software. The parity is selected after the current byte. 0: Even parity 1: Odd parity PIE Parity interrupt enable This bit enables the interrupt capability of the hardware parity control when a parity error is detected (PE bit set). The parity error involved can be a byte parity error (if bit PCE is set and bit LPE is reset) or a LIN parity error (if bit PCE is set and bit LPE is set). 0: Parity error interrupt disabled 1: Parity error interrupt enabled 1 0 Control register 2 (SCICR2) SCICR2 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 (1) TIE TCIE RIE ILIE TE RE RWU R/W R/W R/W R/W R/W R/W R/W SBK(1) R/W 1. This bit has a different function in LIN mode, please refer to the LIN mode register description Table 66. Bit 7 6 5 4 SCICR2 register description Bit name TIE TCIE Function Transmitter interrupt enable This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SCI interrupt is generated whenever TDRE = 1 in the SCISR register Transmission complete interrupt enable This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SCI interrupt is generated whenever TC = 1 in the SCISR register RIE Receiver interrupt enable This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SCI interrupt is generated whenever OR = 1 or RDRF = 1 in the SCISR register ILIE Idle line interrupt enable This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SCI interrupt is generated whenever IDLE = 1 in the SCISR register Doc ID 11928 Rev 8 137/234 On-chip peripherals Table 66. Bit ST7L34 ST7L35 ST7L38 ST7L39 SCICR2 register description (continued) Bit name 3 2 1 0 Function TE Transmitter enable This bit enables the transmitter. It is set and cleared by software. 0: Transmitter is disabled 1: Transmitter is enabled Note: During transmission, an `0' pulse on the TE bit (`0' followed by `1') sends a preamble (idle line) after the current word. When TE is set there is a 1 bit-time delay before the transmission starts. RE Receiver enable This bit enables the receiver. It is set and cleared by software. 0: Receiver is disabled in the SCISR register 1: Receiver is enabled and begins searching for a start bit RWU Receiver wake up This bit determines if the SCI is in mute mode or not. It is set and cleared by software and can be cleared by hardware when a wake up sequence is recognized. 0: Receiver in active mode 1: Receiver in mute mode Note: Before selecting mute mode (by setting the RWU bit), the SCI must first receive a data byte, otherwise it cannot function in mute mode with wakeup by idle line detection. In address mark detection wake up configuration (WAKE bit = 1) the RWU bit cannot be modified by software while the RDRF bit is set. SBK Send break This bit set is used to send break characters. It is set and cleared by software. 0: No break character is transmitted 1: Break characters are transmitted Note: If the SBK bit is set to `1' and then to `0', the transmitter sends a BREAK word at the end of the current word. Data register (SCIDR) Contains the received or transmitted data character, depending on whether it is read from or written to. SCIDR 7 Reset value: undefined 6 5 4 3 2 1 0 DR[7:0] R/W The data register performs a double function (read and write) since it is composed of two registers, one for transmission (TDR) and one for reception (RDR). 138/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals The TDR register provides the parallel interface between the internal bus and the output shift register (see Figure 56: SCI block diagram (in conventional baud rate generator mode) on page 125). The RDR register provides the parallel interface between the input shift register and the internal bus (see Figure 56). Baud rate register (SCIBRR) SCIBRR Reset value: 0000 0000 (00h) 7 Note: 6 5 4 3 2 1 SCP[1:0] SCT[2:0] SCR[2:0] R/W R/W R/W 0 When LIN slave mode is disabled, the SCIBRR register controls the conventional baud rate generator. Table 67. Bit 7:6 5:3 2:0 SCIBRR register description Bit name Function SCP[1:0] First SCI prescaler These 2 prescaling bits allow several standard clock division ranges: 00: PR prescaling factor = 1 01: PR prescaling factor = 3 10: PR prescaling factor = 4 11: PR prescaling factor = 13 SCT[2:0] SCI transmitter rate divisor These 3 bits, in conjunction with the SCP1 and SCP0 bits define the total division applied to the bus clock to yield the transmit rate clock in conventional baud rate generator mode: 000: TR dividing factor = 1 001: TR dividing factor = 2 010: TR dividing factor = 4 011: TR dividing factor = 8 100: TR dividing factor = 16 101: TR dividing factor = 32 110: TR dividing factor = 64 111: TR dividing factor = 128 SCR[2:0] SCI receiver rate divider These 3 bits, in conjunction with the SCP[1:0] bits define the total division applied to the bus clock to yield the receive rate clock in conventional baud rate generator mode: 000: RR dividing factor = 1 001: RR dividing factor = 2 010: RR dividing factor = 4 011: RR dividing factor = 8 100: RR dividing factor = 16 101: RR dividing factor = 32 110: RR dividing factor = 64 111: RR dividing factor = 128 Doc ID 11928 Rev 8 139/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Extended receive prescaler division register (SCIERPR) SCIERPR 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 ERPR[7:0] R/W Table 68. Bit 7:0 SCIERPR register description Bit name Function ERPR[7:0] 8-bit extended receive prescaler register The extended baud rate generator is activated when a value different from 00h is stored in this register. Therefore the clock frequency issued from the 16 divider (see Figure 58: SCI baud rate and extended prescaler block diagram on page 131) is divided by the binary factor set in the SCIERPR register (in the range 1 to 255). The extended baud rate generator is not active after a reset. Extended transmit prescaler division register (SCIETPR) SCIETPR 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 ETPR[7:0] R/W Table 69. Bit 7:0 140/234 SCIETPR register description Bit name Function ETPR[7:0] 8-bit extended transmit prescaler register The extended baud rate generator is activated when a value different from 00h is stored in this register. Therefore the clock frequency issued from the 16 divider (see Figure 58: SCI baud rate and extended prescaler block diagram on page 131) is divided by the binary factor set in the SCIETPR register (in the range 1 to 255). The extended baud rate generator is not used after a reset. Note: In LIN slave mode, the conventional and extended baud rate generators are disabled. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 11.5.9 On-chip peripherals LIN mode - functional description. The block diagram of the serial control interface, in LIN slave mode is shown in Figure 60: SCI block diagram in LIN slave mode on page 143. It uses six registers: 3 control registers: SCICR1, SCICR2 and SCICR3 2 status registers: SCISR register and LHLR register mapped at the SCIERPR address A baud rate register: LPR mapped at the SCIBRR address and an associated fraction register LPFR mapped at the SCIETPR address The bits dedicated to LIN are located in the SCICR3. Refer to the register descriptions in Section 11.5.10: LIN mode register description for the definitions of each bit. Entering LIN mode To use the LINSCI in LIN mode the following configuration must be set in SCICR3 register: Clear the M bit to configure 8-bit word length. Set the LINE bit. Master To enter master mode the LSLV bit must be reset In this case, setting the SBK bit will send 13 low bits. Then the baud rate can programmed using the SCIBRR, SCIERPR and SCIETPR registers. In LIN master mode, the conventional and/or extended prescaler define the baud rate (as in standard SCI mode) Slave Set the LSLV bit in the SCICR3 register to enter LIN slave mode. In this case, setting the SBK bit will have no effect. In LIN slave mode the LIN baud rate generator is selected instead of the conventional or extended prescaler. The LIN baud rate generator is common to the transmitter and the receiver. Then the baud rate can be programmed using LPR and LPRF registers. Note: It is mandatory to set the LIN configuration first before programming LPR and LPRF, because the LIN configuration uses a different baud rate generator from the standard one. LIN transmission In LIN mode the same procedure as in SCI mode has to be applied for a LIN transmission. To transmit the LIN header the proceed as follows: First set the SBK bit in the SCICR2 register to start transmitting a 13-bit LIN synch break Reset the SBK bit Load the LIN synch field (0x55) in the SCIDR register to request synch field transmission Wait until the SCIDR is empty (TDRE bit set in the SCISR register) Load the LIN message Identifier in the SCIDR register to request Identifier transmission. Doc ID 11928 Rev 8 141/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Figure 59. LIN characters 8-bit word length (M bit is reset) Data character Next Start Stop start bit bit Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 bit Start bit Idle line LIN synch field Extra Start bit `1' LIN synch break = 13 low bits LIN synch field Start Bit0 bit Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Next start Bit7 Stop bit bit Measurement for baud rate autosynchronization 142/234 Next data character Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 60. SCI block diagram in LIN slave mode Write Read Data register (SCIDR) Received data register (RDR) Transmit data register (TDR) TDO Receive shift register Transmit shift register RDI R8 T8 SC/ M ID Wake up unit Transmit control SCICR1 WA/ PCE PS PIE KE Receiver control Receiver clock SCICR2 SCISR TD/ TC RD/ ID/ OR/ NF FE PE RF LE LHE RE TIE TCIE RIE ILIE TE RE RW/ SBK U SCI interrupt control Transmitter clock fCPU LD/ UM LIN slave baud rate auto synchronization unit SCICR3 LH/ LSF LI/ LSLV LA/ LHIE LHDM SE DF NE SCIBRR LPR7 LPR0 Conventional baud rate generator and extended prescaler 0 fCPU /LDIV /16 1 LIN slave baud rate generator LIN reception In LIN mode the reception of a byte is the same as in SCI mode but the LINSCI has features for handling the LIN header automatically (identifier detection) or semi-automatically (synch break detection) depending on the LIN header detection mode. The detection mode is selected by the LHDM bit in the SCICR3. Doc ID 11928 Rev 8 143/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Additionally, an automatic resynchronization feature can be activated to compensate for any clock deviation, for more details please refer to LIN baud rate on page 148. LIN header handling by a slave Depending on the LIN header detection method the LINSCI will signal the detection of a LIN header after the LIN synch break or after the Identifier has been successfully received. Note: 1 It is recommended to combine the header detection function with mute mode. Putting the LINSCI in mute mode allows the detection of headers only and prevents the reception of any other characters. 2 This mode can be used to wait for the next header without being interrupted by the data bytes of the current message in case this message is not relevant for the application. Synch break detection (LHDM = 0) When a LIN synch break is received: Note: The RDRF bit in the SCISR register is set. It indicates that the content of the shift register is transferred to the SCIDR register, a value of 0x00 is expected for a break. The LHDF flag in the SCICR3 register indicates that a LIN synch break field has been detected. An interrupt is generated if the LHIE bit in the SCICR3 register is set and the I[1:0] bits are cleared in the CCR register. Then the LIN synch field is received and measured. - If automatic resynchronization is enabled (LASE bit = 1), the LIN synch field is not transferred to the shift register: There is no need to clear the RDRF bit. - If automatic resynchronization is disabled (LASE bit = 0), the LIN synch field is received as a normal character and transferred to the SCIDR register and RDRF is set. In LIN slave mode, the FE bit detects all frame error which does not correspond to a break. Identifier detection (LHDM = 1): This case is the same as the previous one except that the LHDF and the RDRF flags are set only after the entire header has been received (this is true whether automatic resynchronization is enabled or not). This indicates that the LIN Identifier is available in the SCIDR register. Note: During LIN synch field measurement, the SCI state machine is switched off and no characters are transferred to the data register. LIN slave parity In LIN slave mode (LINE and LSLV bits are set) LIN parity checking can be enabled by setting the PCE bit. In this case, the parity bits of the LIN identifier field are checked. The identifier character is recognized as the third received character after a break character (included). See Figure 61: LIN header on page 145. 144/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Figure 61. LIN header Parity bits LIN synch break LIN synch field Identifier field The bits involved are the two MSB positions (7th and 8th bits if M = 0; 8th and 9th bits if M = 0) of the identifier character. The check is performed as specified in Figure 62 by the LIN specification. Figure 62. LIN identifier Parity bits Start bit Stop bit Identifier bits ID0 ID1 ID2 ID3 ID4 ID5 P0 P1 Identifier field P0 = ID0 ID1 ID2 ID4 P1 = ID1 ID3 ID4 ID5 M=0 LIN error detection LIN header error flag The LIN header error flag indicates that an invalid LIN header has been detected. When a LIN header error occurs: The LHE flag is set An interrupt is generated if the RIE bit is set and the I[1:0] bits are cleared in the CCR register. If autosynchronization is enabled (LASE bit = 1), this can mean that the LIN synch field is corrupted, and that the SCI is in a blocked state (LSF bit is set). The only way to recover is to reset the LSF bit and then to clear the LHE bit. The LHE bit is reset by an access to the SCISR register followed by a read of the SCIDR register. LHE/OVR error conditions When auto resynchronization is disabled (LASE bit = 0), the LHE flag detects: That the received LIN synch field is not equal to 55h. That an overrun occurred (as in standard SCI mode) Furthermore, if LHDM is set it also detects that a LIN header reception timeout occurred (only if LHDM is set). Doc ID 11928 Rev 8 145/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 When the LIN auto-resynchronization is enabled (LASE bit = 1), the LHE flag detects: That the deviation error on the synch field is outside the LIN specification which allows up to 15.5% of period deviation between the slave and master oscillators. A LIN header reception timeout occurred. If THEADER > THEADER_MAX then the LHE flag is set. Refer to Figure 63 (only if LHDM is set to 1). An overflow during the synch field measurement, which leads to an overflow of the divider registers. If LHE is set due to this error then the SCI goes into a blocked state (LSF bit is set). That an overrun occurred on Fields other than the Synch Field (as in standard SCI mode) Deviation error on the synch field The deviation error is checked by comparing the current baud rate (relative to the slave oscillator) with the received LIN synch field (relative to the master oscillator). Two checks are performed in parallel: The first check is based on a measurement between the first falling edge and the last falling edge of the synch field. Let us refer to this period deviation as D: If the LHE flag is set, it means that D > 15.625% If LHE flag is not set, it means that D < 16.40625% If 15.625% D < 16.40625%, then the flag can be either set or reset depending on the dephasing between the signal on the RDI line and the CPU clock. The second check is based on the measurement of each bit time between both edges of the synch field. This checks that each of these bit times is large enough compared to the bit time of the current baud rate. When LHE is set due to this error then the SCI goes into a blocked state (LSF bit is set). LIN header time-out error When the LIN identifier field detection method is used (by configuring LHDM to 1) or when LIN auto-resynchronization is enabled (LASE bit = 1), the LINSCI automatically monitors the THEADER_MAX condition given by the LIN protocol. If the entire header (up to and including the STOP bit of the LIN identifier field) is not received within the maximum time limit of 57 bit times then a LIN header error is signalled and the LHE bit is set in the SCISR register. Figure 63. LIN header reception timeout LIN synch break LIN synch field Identifier field THEADER The time-out counter is enabled at each break detection. It is stopped in the following conditions: 146/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals 1. A LIN Identifier field has been received 2. An LHE error occurred (other than a timeout error) 3. A software reset of LSF bit (transition from high to low) occurred during the analysis of the LIN synch field 4. If LHE bit is set due to this error during the LIN synchr field (if LASE bit = 1) then the SCI goes into a blocked state (LSF bit is set) If LHE bit is set due to this error during fields other than LIN synch field or if LASE bit is reset then the current received header is discarded and the SCI searches for a new break field. Note on LIN header time-out limit According to the LIN specification, the maximum length of a LIN header which does not cause a timeout is equal to 1.4 * (34 + 1) = 49 TBIT_MASTER. TBIT_MASTER refers to the master baud rate. When checking this timeout, the slave node is desynchronized for the reception of the LIN break and synch fields. Consequently, a margin must be allowed, taking into account the worst case: This occurs when the LIN identifier lasts exactly 10 TBIT_MASTER periods. In this case, the LIN break and synch fields lasts 49 - 10 = 39 TBIT_MASTER periods. Assuming the slave measures these first 39 bits with a desynchronized clock of 15.5%. This leads to a maximum allowed header length of: 39 x (1/0.845) TBIT_MASTER + 10TBIT_MASTER = 56.15 TBIT_SLAVE. A margin is provided so that the time-out occurs when the header length is greater than 57 TBIT_SLAVE periods. If it is less than or equal to 57 TBIT_SLAVE periods, then no timeout occurs. LIN header length Even if no timeout occurs on the LIN header, it is possible to have access to the effective LIN header length (THEADER) through the LHL register. This allows monitoring at software level the TFRAME_MAX condition given by the LIN protocol. This feature is only available when LHDM bit = 1 or when LASE bit = 1. Mute mode and errors In mute mode when LHDM bit = 1, if an LHE error occurs during the analysis of the LIN synch field or if a LIN header time-out occurs then the LHE bit is set but it does not wake up from mute mode. In this case, the current header analysis is discarded. If needed, the software has to reset LSF bit. Then the SCI searches for a new LIN header. In mute mode, if a framing error occurs on a data (which is not a break), it is discarded and the FE bit is not set. When LHDM bit = 1, any LIN header which respects the following conditions causes a wakeup from mute mode: A valid LIN break field (at least 11 dominant bits followed by a recessive bit) A valid LIN synch field (without deviation error) A LIN identifier field without framing error. Note that a LIN parity error on the LIN identifier field does not prevent wake-up from mute mode. No LIN header time-out should occur during header reception. Doc ID 11928 Rev 8 147/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Figure 64. LIN synch field measurement TCPU = CPU period TBR = Baud rate period SM = Synch measurement register (15 bits) TBR = 16.LP.TCPU TBR LIN synch break LIN synch field Start bit Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Extra '1' Measurement = 8.TBR = SM.tCPU LPR(n) Bit7 Stop bit Next start bit LPR(n+1) LPR = TBR/(16.TCPU) = rounding (SM/128) LIN baud rate Baud rate programming is done by writing a value in the LPR prescaler or performing an automatic resynchronization as described below. Automatic resynchronization To automatically adjust the baud rate based on measurement of the LIN synch field: Write the nominal LIN prescaler value (usually depending on the nominal baud rate) in the LPFR/LPR registers Set the LASE bit to enable the auto synchronization unit When auto synchronization is enabled, after each LIN synch break, the time duration between five falling edges on RDI is sampled on fCPU and the result of this measurement is stored in an internal 15-bit register called SM (not user accessible) (see Figure 64). Then the LDIV value (and its associated LPFR and LPR registers) are automatically updated at the end of the fifth falling edge. During LIN synch field measurement, the SCI state machine is stopped and no data is transferred to the data register. LIN slave baud rate generation In LIN mode, transmission and reception are driven by the LIN baud rate generator Note: LIN master mode uses the extended or conventional prescaler register to generate the baud rate. If LINE bit = 1 and LSLV bit = 1 then the conventional and extended baud rate generators are disabled The baud rate for the receiver and transmitter are both set to the same value, depending on the LIN slave baud rate generator: Tx = Rx = fCPU (16*LDIV) where: LDIV is an unsigned fixed point number. The mantissa is coded on 8 bits in the LPR register and the fraction is coded on 4 bits in the LPFR register. If LASE bit = 1 then LDIV is automatically updated at the end of each LIN synch field. 148/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Three registers are used internally to manage the auto-update of the LIN divider (LDIV): LDIV_NOM (nominal value written by software at LPR/LPFR addresses) LDIV_MEAS (results of the field synch measurement) LDIV (used to generate the local baud rate) The control and interactions of these registers, explained in Figure 65 and Figure 66, depend on the LDUM bit setting (LIN divider update method). Note: As explained in Figure 65 and Figure 66, LDIV can be updated by two concurrent actions: a transfer from LDIV_MEAS at the end of the LIN sync field and a transfer from LDIV_NOM due to a software write of LPR. If both operations occur at the same time, the transfer from LDIV_NOM has priority. Figure 65. LDIV read/write operations when LDUM = 0 Write LPR Write LPFR MANT(7:0) FRAC(3:0) LDIV_NOM Write LPR MANT(7:0) LIN sync field measurement FRAC(3:0) LDIV_MEAS Update at end of synch field MANT(7:0) Read LPR FRAC(3:0) LDIV Baud rate generation Read LPFR Doc ID 11928 Rev 8 149/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Figure 66. LDIV read/write operations when LDUM = 1 Write LPR Write LPFR MANT(7:0) FRAC(3:0) LDIV_NOM LIN sync field measurement RDRF = 1 MANT(7:0) FRAC(3:0) LDIV_MEAS Update at end of synch field MANT(7:0) Read LPR FRAC(3:0) LDIV Baud rate generation Read LPFR LINSCI clock tolerance LINSCI clock tolerance when unsynchronized When LIN slaves are unsynchronized (meaning no characters have been transmitted for a relatively long time), the maximum tolerated deviation of the LINSCI clock is 15%. If the deviation is within this range then the LIN synch break is detected properly when a new reception occurs. This is made possible by the fact that masters send 13 low bits for the LIN synch break, which can be interpreted as 11 low bits (13 bits -15% = 11.05) by a `fast' slave and then considered as a LIN synch break. According to the LIN specification, a LIN synch break is valid when its duration is greater than tSBRKTS = 10. This means that the LIN synch break must last at least 11 low bits. Note: If the period desynchronization of the slave is +15% (slave too slow), the character `00h' which represents a sequence of 9 low bits must not be interpreted as a break character (9 bits + 15% = 10.35). Consequently, a valid LIN synch break must last at least 11 low bits. LINSCI clock tolerance when synchronized When synchronization has been performed, following reception of a LIN synch break, the LINSCI, in LIN mode, has the same clock deviation tolerance as in SCI mode, which is explained below: During reception, each bit is oversampled 16 times. The mean of the 8th, 9th and 10th samples is considered as the bit value. Consequently, the clock frequency should not vary more than 6/16 (37.5%) within one bit. The sampling clock is resynchronized at each start bit, so that when receiving 10 bits (one start bit, 1 data byte, 1 stop bit), the clock deviation should not exceed 3.75%. 150/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Clock deviation causes The causes which contribute to the total deviation are: - Note: DTRA: Deviation due to transmitter error. The transmitter can be either a master or a slave (in case of a slave listening to the response of another slave) - DMEAS: Error due to the LIN synch measurement performed by the receiver - DQUANT: Error due to the baud rate quantization of the receiver - DREC: Deviation of the local oscillator of the receiver. This deviation can occur during the reception of one complete LIN message assuming that the deviation has been compensated at the beginning of the message. - DTCL: Deviation due to the transmission line (generally due to the transceivers) All the deviations of the system should be added and compared to the LINSCI clock tolerance: DTRA + DMEAS +DQUANT + DREC + DTCL < 3.75% Figure 67. Bit sampling in reception mode RDI line Sampled values Sample clock 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 6/16 7/16 7/16 One bit time Error due to LIN synch measurement The LIN synch field is measured over eight bit times. This measurement is performed using a counter clocked by the CPU clock. The edge detections are performed using the CPU clock cycle. This leads to a precision of 2 CPU clock cycles for the measurement which lasts 16*8*LDIV clock cycles. Consequently, this error (DMEAS) is equal to: 2/(128*LDIVMIN). LDIVMIN corresponds to the minimum LIN prescaler content, leading to the maximum baud rate, taking into account the maximum deviation of +/-15%. Error due to baud rate quantization The baud rate can be adjusted in steps of 1/(16 * LDIV). The worst case occurs when the "real" baud rate is in the middle of the step. This leads to a quantization error (DQUANT) equal to 1/(2*16*LDIVMIN). Doc ID 11928 Rev 8 151/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Impact of clock deviation on maximum baud rate The choice of the nominal baud rate (LDIVNOM) will influence both the quantization error (DQUANT) and the measurement error (DMEAS). The worst case occurs for LDIVMIN. Consequently, at a given CPU frequency, the maximum possible nominal baud rate (LPRMIN) should be chosen with respect to the maximum tolerated deviation given by the equation: DTRA + 2 / (128*LDIVMIN) + 1 / (2*16*LDIVMIN) + DREC + DTCL < 3.75% Example: A nominal baud rate of 20 Kbits/s at TCPU = 125ns (8 MHz) leads to LDIVNOM = 25d LDIVMIN = 25 - 0.15*25 = 21.25 DMEAS = 2 / (128*LDIVMIN) * 100 = 0.00073% DQUANT = 1 / (2*16*LDIVMIN) * 100 = 0.0015%. LIN slave systems For LIN slave systems (the LINE and LSLV bits are set), receivers wake up by LIN synch break or LIN identifier detection (depending on the LHDM bit). Hot plugging feature for LIN slave nodes In LIN slave mute mode (the LINE, LSLV and RWU bits are set) it is possible to hot plug to a network during an ongoing communication flow. In this case the SCI monitors the bus on the RDI line until 11 consecutive dominant bits have been detected and discards all the other bits received. 11.5.10 LIN mode register description Status register (SCISR) SCISR 152/234 Reset value: 1100 0000 (C0h) 7 6 5 4 3 2 1 0 TDRE TC RDRF IDLE LHE NF FE PE RO RO RO RO RO RO RO RO Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 70. Bit Name On-chip peripherals SCISR register description(1) Function 7 Transmit data register empty This bit is set by hardware when the content of the TDR register has been transferred into the shift register. An interrupt is generated if the TIE = 1 in the SCICR2 register. It TDRE is cleared by a software sequence (an access to the SCISR register followed by a write to the SCIDR register). 0: Data is not transferred to the shift register 1: Data is transferred to the shift register 6 Transmission complete This bit is set by hardware when transmission of a character containing data is complete. An interrupt is generated if TCIE = 1 in the SCICR2 register. It is cleared by a software sequence (an access to the SCISR register followed by a write to the SCIDR register). 0: Transmission is not complete 1: Transmission is complete Note: TC is not set after the transmission of a preamble or a break. TC 5 Received data ready flag This bit is set by hardware when the content of the RDR register has been transferred to the SCIDR register. An interrupt is generated if RIE = 1 in the SCICR2 register. It is RDRF cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). 0: Data is not received 1: Received data are ready to be read 4 Idle line detected This bit is set by hardware when an idle line is detected. An interrupt is generated if the ILIE = 1 in the SCICR2 register. It is cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). IDLE 0: No idle line is detected 1: idle line is detected Note: The IDLE bit is not set again until the RDRF bit has been set itself (that is, a new idle line occurs). 3 LIN header error During LIN header this bit signals three error types: The LIN synch field is corrupted and the SCI is blocked in LIN synch state (LSF bit = 1). A timeout occurred during LIN header reception. An overrun error was detected on one of the header field (see OR bit description in Status register (SCISR) on page 134). An interrupt is generated if RIE = 1 in the SCICR2 register. If blocked in the LIN synch state, the LSF bit must first be reset (to exit LIN synch field state and then to be able to clear LHE flag). Then it is cleared by the following software sequence: An access to the SCISR register followed by a read to the SCIDR register. 0: No LIN header error 1: LIN header error detected Note: Apart from the LIN header this bit signals an overrun error as in SCI mode, (see description in Status register (SCISR) on page 134). LHE Doc ID 11928 Rev 8 153/234 On-chip peripherals Table 70. ST7L34 ST7L35 ST7L38 ST7L39 SCISR register description(1) (continued) Bit Name 2 NF Noise flag In LIN master mode (LINE bit = 1 and LSLV bit = 0) this bit has the same function as in SCI mode, please refer to Status register (SCISR) on page 134. In LIN slave mode (LINE bit = 1 and LSLV bit = 1) this bit has no meaning. FE Framing error In LIN slave mode, this bit is set only when a real framing error is detected (if the stop bit is dominant (0) and at least one of the other bits is recessive (1). It is not set when a break occurs, the LHDF bit is used instead as a break flag (if the LHDM bit = 0). It is cleared by a software sequence (an access to the SCISR register followed by a read to the SCIDR register). 0: No framing error 1: Framing error detected PE Parity error This bit is set by hardware when a LIN parity error occurs (if the PCE bit is set) in receiver mode. It is cleared by a software sequence (a read to the status register followed by an access to the SCIDR data register). An interrupt is generated if PIE = 1 in the SCICR1 register. 0: No LIN parity error 1: LIN parity error detected 1 0 Function 1. Bits 7:4 have the same function as in SCI mode, please refer to Status register (SCISR) on page 134. Control register 1 (SCICR1) SCICR1 7 6 5 4 3 2 1 0 R8 T8 SCID M WAKE PCE Reserved PIE R/W R/W R/W R/W R/W R/W - R/W Table 71. Bit Name SCICR1 register description(1) Function 7 R8 Receive data bit 8 This bit is used to store the 9th bit of the received word when M = 1. 6 T8 Transmit data bit 8 This bit is used to store the 9th bit of the transmitted word when M = 1. 5 154/234 Reset value: x000 0000 (x0h) Disabled for low power consumption When this bit is set the SCI prescalers and outputs are stopped and the end of the current byte transfer in order to reduce power consumption.This bit is set and cleared SCID by software. 0: SCI enabled 1: SCI prescaler and outputs disabled Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Table 71. On-chip peripherals SCICR1 register description(1) (continued) Bit Name 4 3 M Word length This bit determines the word length. It is set or cleared by software. 0: 1 start bit, 8 data bits, 1 stop bit 1: 1 start bit, 9 data bits, 1 stop bit Note: The M bit must not be modified during a data transfer (both transmission and reception). Wake-up method This bit determines the SCI wake-up method. It is set or cleared by software. WAKE 0: Idle line 1: Address mark Note: If the LINE bit is set, the WAKE bit is deactivated and replaced by the LHDM bit. 2 PCE 1 - 0 Function PIE Parity control enable This bit is set and cleared by software. It selects the hardware parity control for LIN identifier parity check. 0: Parity control disabled 1: Parity control enabled When a parity error occurs, the PE bit in the SCISR register is set. Reserved, must be kept cleared Parity interrupt enable This bit enables the interrupt capability of the hardware parity control when a parity error is detected (PE bit set). The parity error involved can be a byte parity error (if bit PCE is set and bit LPE is reset) or a LIN parity error (if bit PCE is set and bit LPE is set). 0: Parity error interrupt disabled 1: Parity error interrupt enabled 1. Bits 7:3 and bit 0 have the same function as in SCI mode; please refer to Control register 1 (SCICR1) on page 136. Control register 2 (SCICR2) SCICR2 Reset value: 0000 0000 (00h) 7 6 5 4 3 2 1 0 TIE TCIE RIE ILIE TE RE RWU SBK R/W R/W R/W R/W R/W R/W R/W R/W Doc ID 11928 Rev 8 155/234 On-chip peripherals Table 72. Bit Name 7 6 5 4 3 2 TIE ST7L34 ST7L35 ST7L38 ST7L39 SCICR2 register description(1) Function Transmitter interrupt enable This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SCI interrupt is generated whenever TDRE = 1 in the SCISR register Transmission complete interrupt enable This bit is set and cleared by software. TCIE 0: Interrupt is inhibited 1: An SCI interrupt is generated whenever TC = 1 in the SCISR register RIE Receiver interrupt enable This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SCI interrupt is generated whenever OR = 1 or RDRF = 1 in the SCISR register ILIE Idle line interrupt enable This bit is set and cleared by software. 0: Interrupt is inhibited 1: An SCI interrupt is generated whenever IDLE = 1 in the SCISR register TE Transmitter enable This bit enables the transmitter. It is set and cleared by software. 0: Transmitter is disabled 1: Transmitter is enabled Note: During transmission, a `0' pulse on the TE bit (`0' followed by `1') sends a preamble (idle line) after the current word. When TE is set, there is a 1 bit-time delay before the transmission starts. RE Receiver enable This bit enables the receiver. It is set and cleared by software. 0: Receiver is disabled in the SCISR register 1: Receiver is enabled and begins searching for a start bit 1 Receiver wake-up This bit determines if the SCI is in mute mode or not. It is set and cleared by software and can be cleared by hardware when a wake-up sequence is recognized. 0: Receiver in active mode 1: Receiver in mute mode RWU Note: Mute mode is recommended for detecting only the header and avoiding the reception of any other characters. For more details please refer to LIN reception on page 143. In LIN slave mode, when RDRF is set, the software can not set or clear the RWU bit. 0 Send break This bit set is used to send break characters. It is set and cleared by software. 0: No break character is transmitted 1: Break characters are transmitted Note: If the SBK bit is set to `1' and then to `0', the transmitter sends a BREAK word at the end of the current word. SBK 1. Bits 7:2 have the same function as in SCI mode; please refer to Control register 2 (SCICR2) on page 137. 156/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Control register 3 (SCICR3) SCICR3 7 6 5 4 3 2 1 0 LDUM LINE LSLV LASE LHDM LHIE LHDF LSF R/W R/W R/W R/W R/W R/W R/W R/W Table 73. Bit 7 Reset value: 0000 0000 (00h) SCICR3 register description Name Function LDUM LIN divider update method This bit is set and cleared by software and is also cleared by hardware (when RDRF = 1). It is only used in LIN slave mode. It determines how the LIN divider can be updated by software. 0: LDIV is updated as soon as LPR is written (if no auto synchronization update occurs at the same time) 1: LDIV is updated at the next received character (when RDRF = 1) after a write to the LPR register Note: If no write to LPR is performed between the setting of LDUM bit and the reception of the next character, LDIV is updated with the old value. After LDUM has been set, it is possible to reset the LDUM bit by software. In this case, LDIV can be modified by writing into LPR/LPFR registers. LIN mode enable bits These bits configure the LIN mode: 0x: LIN mode disabled 10: LIN master mode 11: LIN slave mode The LIN master configuration enables sending of LIN synch breaks (13 low bits) using the SBK bit in the SCICR2 register. The LIN slave configuration enables: The LIN slave baud rate generator. The LIN divider (LDIV) is then represented by 6:5 LINE, LSLV the LPR and LPFR registers. The LPR and LPFR registers are read/write accessible at the address of the SCIBRR register and the address of the SCIETPR register. Management of LIN headers LIN synch break detection (11-bit dominant) LIN wake-up method (see LHDM bit) instead of the normal SCI wake-up method Inhibition of break transmission capability (SBK has no effect) LIN parity checking (in conjunction with the PCE bit) 4 LASE LIN auto synch enable This bit enables the auto synch unit (ASU). It is set and cleared by software. It is only usable in LIN slave mode. 0: Auto synch unit disabled 1: Auto synch unit enabled Doc ID 11928 Rev 8 157/234 On-chip peripherals Table 73. Bit 3 2 1 0 ST7L34 ST7L35 ST7L38 ST7L39 SCICR3 register description (continued) Name LHDM Function LIN header detection method This bit is set and cleared by software. It is only usable in LIN slave mode. It enables the header detection method. In addition if the RWU bit in the SCICR2 register is set, the LHDM bit selects the wake-up method (replacing the WAKE bit). 0: LIN synch break detection method 1: LIN identifier field detection method LHIE LIN header interrupt enable This bit is set and cleared by software. It is only usable in LIN slave mode. 0: LIN header interrupt is inhibited 1: An SCI interrupt is generated whenever LHDF = 1 LHDF LIN header detection flag This bit is set by hardware when a LIN header is detected and cleared by a software sequence (an access to the SCISR register followed by a read of the SCICR3 register). It is only usable in LIN slave mode. 0: No LIN header detected 1: LIN header detected Note: The header detection method depends on the LHDM bit: - If LHDM = 0, a header is detected as a LIN synch break - If LHDM = 1, a header is detected as a LIN Identifier, meaning that a LIN synch break field + a LIN synch field + a LIN identifier field have been consecutively received. LSF LIN synch field state This bit indicates that the LIN synch field is being analyzed. It is only used in LIN slave mode. In auto synchronization mode (LASE bit = 1), when the SCI is in the LIN synch field state it waits or counts the falling edges on the RDI line. It is set by hardware as soon as a LIN synch break is detected and cleared by hardware when the LIN synch field analysis is finished (see Figure 68). This bit can also be cleared by software to exit LIN Synch state and return to idle mode. 0: The current character is not the LIN synch field 1: LIN synch field state (LIN synch field undergoing analysis) Figure 68. LSF bit set and clear Parity bits 11 dominant bits LSF bit LIN synch break 158/234 LIN synch field Doc ID 11928 Rev 8 Identifier field ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals LIN divider registers LDIV is coded using the two registers LPR and LPFR. In LIN slave mode, the LPR register is accessible at the address of the SCIBRR register and the LPFR register is accessible at the address of the SCIETPR register. LIN prescaler register (LPR) LPR Reset value: 0000 0000 (00h) 7 6 5 4 3 2 1 0 LPR[7:0] R/W Table 74. Bit LPR register description Name Function 7:0 LPR[7:0] Table 75. Caution: LIN prescaler (mantissa of LDIV) These 8 bits define the value of the mantissa of the LDIV (see Table 75). LIN mantissa rounded values LPR[7:0] Rounded mantissa (LDIV) 00h SCI clock disabled 01h 1 ... ... FEh 254 FFh 255 LPR and LPFR registers have different meanings when reading or writing to them. Consequently bit manipulation instructions (BRES or BSET) should never be used to modify the LPR[7:0] bits, or the LPFR[3:0] bits. LIN prescaler fraction register (LPFR) LPFR 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 Reserved LPFR[3:0] - R/W Doc ID 11928 Rev 8 0 159/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Table 76. LPFR register description Bit Name 7:4 - Function Reserved, must be kept cleared Fraction of LDIV These 4 bits define the fraction of the LDIV (see Table 77). Note: When initializing LDIV, the LPFR register must be written first. Then, the 3:0 LPFR[3:0] write to the LPR register effectively updates LDIV and so the clock generation. In LIN slave mode, if the LPR[7:0] register is equal to 00h, the transceiver and receiver input clocks are switched off. Table 77. LDIV fractions LPFR[3:0] Fraction (LDIV) 0h 0 1h 1/16 ... ... Eh 14/16 Fh 15/16 Examples of LDIV coding Example 1: LPR = 27d and LPFR = 12d This leads to: Mantissa (LDIV) = 27d Fraction (LDIV) = 12/16 = 0.75d Therefore LDIV = 27.75d Example 2: LDIV = 25.62d This leads to: LPFR = rounded(16*0.62d) = rounded(9.92d) = 10d = Ah LPR = mantissa (25.620d) = 25d = 1Bh Example 3: LDIV = 25.99d This leads to: LPFR = rounded(16*0.99d) = rounded(15.84d) = 16d The carry must be propagated to the mantissa: LPR = mantissa (25.99) + 1 = 26d = 1Ch. LIN header length register (LHLR) LHLR 7 Reset value: 0000 0000 (00h) 6 5 4 3 LHL[7:0] R 160/234 Doc ID 11928 Rev 8 2 1 0 ST7L34 ST7L35 ST7L38 ST7L39 Note: On-chip peripherals In LIN slave mode when LASE = 1 or LHDM = 1, the LHLR register is accessible at the address of the SCIERPR register. Otherwise this register is always read as 00h. Table 78. Bit 7:0 LHLR register description Name Function LHL[7:0] LIN header length This is a read-only register, which is updated by hardware if one of the following conditions occurs: After each break detection, it is loaded with `FFh' If a timeout occurs on THEADER, it is loaded with 00h After every successful LIN header reception (at the same time as the setting of LHDF bit), it is loaded with a value (LHL) which gives access to the number of bit times of the LIN header length (THEADER). LHL register coding is as follows: THEADER_MAX = 57 LHL (7:2) represents the mantissa of (57 - THEADER) (see Table 79) LHL (1:0) represents the fraction (57 - THEADER) (see Table 80) Table 79. Table 80. LIN header mantissa values LHL[7:2] Mantissa (57 - THEADER) Mantissa (THEADER) 0h 0 57 1h 1 56 ... ... ... 39h 56 1 3Ah 57 0 3Bh 58 Never occurs ... ... ... 3Eh 62 Never occurs 3Fh 63 Initial value LIN header fractions LHL[1:0] Fraction (57 - THEADER) 0h 0 1h 1/4 2h 1/2 3h 3/4 Doc ID 11928 Rev 8 161/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Examples of LHL coding: Example 1: LHL = 33h = 001100 11b LHL(7:3) = 1100b = 12d LHL(1:0) = 11b = 3d This leads to: Mantissa (57 - THEADER) = 12d Fraction (57 - THEADER) = 3/4 = 0.75 Therefore: (57 - THEADER) = 12.75d and THEADER = 44.25d Example 2: 57 - THEADER = 36.21d LHL(1:0) = rounded(4*0.21d) = 1d LHL(7:2) = Mantissa (36.21d) = 36d = 24h Therefore LHL(7:0) = 10010001 = 91h Example 3: 57 - THEADER = 36.90d LHL(1:0) = rounded(4*0.90d) = 4d The carry must be propagated to the matissa: LHL(7:2) = Mantissa (36.90d) + 1 = 37d Therefore LHL(7:0) = 10110000 = A0h Table 81. Addr. (Hex.) LINSCI1 register map and reset values Register name 7 6 5 4 3 2 1 0 40 SCISR Reset value TDRE 1 TC 1 RDRF 0 IDLE 0 OR/LHE 0 NF 0 FE 0 PE 0 41 SCIDR Reset value DR7 - DR6 - DR5 - DR4 - DR3 - DR2 - DR1 - DR0 - 42 SCIBRR LPR (LIN slave mode) Reset value SCP1 LPR7 0 SCP0 LPR6 0 SCT2 LPR5 0 SCT1 LPR4 0 SCT0 LPR3 0 SCR2 LPR2 0 SCR1 LPR1 0 SCR0 LPR0 0 43 SCICR1 Reset value R8 x T8 0 SCID 0 M 0 WAKE 0 PCE 0 PS 0 PIE 0 44 SCICR2 Reset value TIE 0 TCIE 0 RIE 0 ILIE 0 TE 0 RE 0 RWU 0 SBK 0 45 SCICR3 Reset value NP 0 LINE 0 LSLV 0 LASE 0 LHDM 0 LHIE 0 LHDF 0 LSF 0 46 SCIERPR ERPR7 ERPR6 ERPR5 ERPR4 ERPR3 ERPR2 ERPR1 ERPR0 LHLR (LIN slave mode) LHL7 LHL6 LHL5 LHL4 LHL3 LHL2 LHL1 LHL0 Reset value 0 0 0 0 0 0 0 0 47 162/234 SCITPR ETPR7 LPFR (LIN slave mode) LDUM 0 Reset value ETPR6 0 0 ETPR5 ETPR4 0 0 0 0 Doc ID 11928 Rev 8 ETPR3 LPFR3 0 ETPR2 ETPR1 ETPR0 LPFR2 LPFR1 LPFR0 0 0 0 ST7L34 ST7L35 ST7L38 ST7L39 Table 81. On-chip peripherals LINSCI1 register map and reset values (continued) Addr. (Hex.) Register name 7 6 5 4 3 2 1 0 40 SCISR Reset value TDRE 1 TC 1 RDRF 0 IDLE 0 OR/LHE 0 NF 0 FE 0 PE 0 41 SCIDR Reset value DR7 - DR6 - DR5 - DR4 - DR3 - DR2 - DR1 - DR0 - 11.6 10-bit A/D converter (ADC) 11.6.1 Introduction The on-chip analog to digital converter (ADC) peripheral is a 10-bit, successive approximation converter with internal sample and hold circuitry. This peripheral has up to seven multiplexed analog input channels (refer to device pinout description) that allow the peripheral to convert the analog voltage levels from up to seven different sources. The result of the conversion is stored in a 10-bit data register. The A/D converter is controlled through a control/status register. 11.6.2 Main features 10-bit conversion Up to 7 channels with multiplexed input Linear successive approximation Data register (DR) which contains the results Conversion complete status flag On/off bit (to reduce consumption) The block diagram is shown in Figure 69: ADC block diagram on page 164. 11.6.3 Functional description Analog power supply VDDA and VSSA are the high and low level reference voltage pins. In some devices (refer to Section 2: Pin description) they are internally connected to the VDD and VSS pins. Conversion accuracy may therefore be impacted by voltage drops and noise in the event of heavily loaded or badly decoupled power supply lines. Doc ID 11928 Rev 8 163/234 On-chip peripherals ST7L34 ST7L35 ST7L38 ST7L39 Figure 69. ADC block diagram Div 4 fCPU Div 2 1 fADC 0 0 1 EOC Slow bit SPE ED AD ON 0 0 CH2 CH1 CH0 ADCCSR 3 Hold control AIN0 RADC AIN1 Analog to digital Analog mux converter AINx CADC ADCDRH D9 D8 ADCDRL D7 D6 0 D4 D5 0 0 D3 D2 AMP SL AMP CAL OW SEL D1 D0 Digital A/D conversion result The conversion is monotonic, meaning that the result never decreases if the analog input does not decrease and never increases if the analog input does not increase. If the input voltage (VAIN) is greater than VDDA (high-level voltage reference) then the conversion result is FFh in the ADCDRH register and 03h in the ADCDRL register (without overflow indication). If the input voltage (VAIN) is lower than VSSA (low-level voltage reference) then the conversion result in the ADCDRH and ADCDRL registers is 00 00h. The A/D converter is linear and the digital result of the conversion is stored in the ADCDRH and ADCDRL registers. The accuracy of the conversion is described in the Section 13: Electrical characteristics. RAIN is the maximum recommended impedance for an analog input signal. If the impedance is too high, this results in a loss of accuracy due to leakage and sampling not being completed in the allotted time. A/D conversion The analog input ports must be configured as input, no pull-up, no interrupt. Refer to Section 10: I/O ports. Using these pins as analog inputs does not affect the ability of the port to be read as a logic input. In the ADCCSR register, select the CH[2:0] bits to assign the analog channel to convert. 164/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals ADC conversion mode In the ADCCSR register, set the ADON bit to enable the A/D converter and to start the 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 - The result is in the ADCDR registers A read to the ADCDRH resets the EOC bit. To read the 10 bits, perform the following steps: 1. Poll the EOC bit 2. Read ADCDRL 3. Read ADCDRH. This clears EOC automatically To read only 8 bits, perform the following steps: 1. Poll EOC bit 2. Read ADCDRH. This clears EOC automatically 11.6.4 Low-power modes 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 . Table 82. Effect of low power modes on the A/D converter Mode 11.6.5 Description Wait No effect on A/D converter Halt A/D converter disabled After wakeup from halt mode, the A/D converter requires a stabilization time tSTAB (Section 13: Electrical characteristics) before accurate conversions can be performed. Interrupts None. Doc ID 11928 Rev 8 165/234 On-chip peripherals 11.6.6 ST7L34 ST7L35 ST7L38 ST7L39 Register description Control/status register (ADCCSR) ADCCSR 7 6 5 4 3 EOC SPEED ADON Reserved Reserved CH[2:0] R R/W R/W - - R/W Table 83. Bit 7 2 1 0 ADCCSR register description Bit name EOC Function End of conversion This bit is set by hardware. It is cleared by software reading the ADCDRH register. 0: Conversion is not complete 1: Conversion complete 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 Table 86: ADC clock configuration on page 167 concerning the SLOW bit description of the ADCDRL register. 5 ADON A/D converter on This bit is set and cleared by software. 0: A/D converter is switched off 1: A/D converter is switched on 4:3 - 6 2:0 166/234 Reset value: 0000 0000 (00h) CH[2:0] Reserved, must be kept cleared. Channel selection These bits are set and cleared by software. They select the analog input to convert: 000: channel pin = AIN0 001: channel pin = AIN1 010: channel pin = AIN2 011: channel pin = AIN3 100: channel pin = AIN4 101: channel pin = AIN5 110: channel pin = AIN6 Note: The number of channels is device dependent. Refer to Section 2: Pin description. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Data register high (ADCDRH) ADCDRH 7 Reset value: 0000 0000 (00h) 6 5 4 3 2 1 0 D[9:2] R Table 84. ADCDRH register description Bit Bit name 7:0 D[9:2] Function MSB of analog converted value Control and data register low (ADCDRL) ADCDRL Reset value: 0000 0000 (00h) 7 6 5 4 3 2 Reserved Reserved Reserved Reserved SLOW Reserved D[1:0] - - - - R/W - R/W Table 85. 0 ADCDRL register description Bit Bit name 7:5 - Reserved, must be kept cleared 4 - Reserved, must be kept cleared Function 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 in Table 86: ADC clock configuration on page 167 3 SLOW 2 - Reserved, must be kept cleared 1:0 D[1:0] LSB of converted analog value Table 86. 1 ADC clock configuration(1) fADC SLOW SPEED fCPU/2 0 0 fCPU 0 1 fCPU/4 1 x 1. Max fADC allowed = 4 MHz (see Section 13.11: 10-bit ADC characteristics on page 210) Doc ID 11928 Rev 8 167/234 On-chip peripherals Table 87. 168/234 ST7L34 ST7L35 ST7L38 ST7L39 ADC register map and reset values Address (Hex.) Register label 7 6 5 4 3 2 1 0 0034h ADCCSR Reset value EOC 0 SPEED 0 ADON 0 0 0 0 0 CH2 0 CH1 0 CH0 0 0035h ADCDRH Reset value D9 0 D8 0 D7 0 D6 0 D5 0 D4 0 D3 0 D2 0 0036h ADCDRL Reset value 0 0 0 0 0 0 0 0 SLOW 0 0 0 D1 x D0 x Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Instruction set 12 Instruction set 12.1 ST7 addressing modes The ST7 core features 17 different addressing modes which can be classified in seven main groups (see Table 88). Table 88. CPU addressing mode groups Addressing mode Example Inherent nop Immediate ld A,#$55 Direct ld A,$55 Indexed ld A,($55,X) Indirect ld A,([$55],X) Relative jrne loop Bit operation bset byte,#5 The ST7instruction set is designed to minimize the number of bytes required per instruction. To do 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. Doc ID 11928 Rev 8 169/234 Instruction set Table 89. ST7L34 ST7L35 ST7L38 ST7L39 CPU addressing mode overview Mode Syntax Destination/s ource Pointer address Pointer size Length (bytes) Inherent nop +0 Immediate ld A,#$55 +1 Short Direct ld A,$10 00..FF +1 Long Direct ld A,$1000 0000..FFFF +2 No offset Direct Indexed ld A,(X) 00..FF + 0 (with X register) +1 (with Y register) Short Direct Indexed ld A,($10,X) 00..1FE +1 Long Direct Indexed ld A,($1000,X) 0000..FFFF +2 Short Indirect ld A,[$10] 00..FF 00..FF byte +2 Long Indirect ld A,[$10.w] 0000..FFFF 00..FF word +2 Short Indirect Indexed ld A,([$10],X) 00..1FE 00..FF byte +2 Long Indirect Indexed ld A,([$10.w],X) 0000..FFFF 00..FF word +2 Relative Direct jrne loop PC128/PC+127(1) Relative Indirect jrne [$10] PC00..FF 128/PC+127(1) Bit Direct bset $10,#7 00..FF Bit Indirect bset [$10],#7 00..FF Bit Direct Bit Indirect Relative btjt [$10],#7,skip Relative btjt $10,#7,skip +1 byte +1 00..FF byte 00..FF 00..FF +2 +2 +2 00..FF byte +3 1. At the time the instruction is executed, the program counter (PC) points to the instruction following JRxx. 170/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 12.1.1 Instruction set Inherent All inherent instructions consist of a single byte. The opcode fully specifies all the required information for the CPU to process the operation. Table 90. Inherent instructions Inherent instruction 12.1.2 Function NOP No operation TRAP S/W interrupt WFI Wait for interrupt (low power mode) HALT Halt oscillator (lowest power mode) RET Subroutine return IRET Interrupt subroutine return SIM Set interrupt mask RIM Reset interrupt mask SCF Set carry flag RCF Reset carry flag RSP Reset stack pointer LD Load CLR Clear PUSH/POP Push/pop to/from the stack INC/DEC Increment/decrement TNZ Test negative or zero CPL, NEG 1 or 2 complement MUL Byte multiplication SLL, SRL, SRA, RLC, RRC Shift and rotate operations SWAP Swap nibbles Immediate Immediate instructions have 2 bytes, the first byte contains the opcode, the second byte contains the operand value. Table 91. Immediate instructions Immediate instruction Function LD Load CP Compare BCP Bit compare AND, OR, XOR Logical operations ADC, ADD, SUB, SBC Arithmetic operations Doc ID 11928 Rev 8 171/234 Instruction set 12.1.3 ST7L34 ST7L35 ST7L38 ST7L39 Direct In direct instructions, the operands are referenced by their memory address. The direct addressing mode consists of two sub-modes: Direct instructions (short) The address is a byte, thus requires only one byte after the opcode, but only allows 00 - FF addressing space. Direct instructions (long) The address is a word, thus allowing 64 Kbyte addressing space, but requires two 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 two 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 submodes: 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. 172/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 12.1.6 Instruction set 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 92. Instructions supporting direct, indexed, indirect and indirect indexed addressing modes Long and short instructions Function LD Load CP Compare AND, OR, XOR Logical operations ADC, ADD, SUB, SBC Arithmetic addition/subtraction operations BCP Bit compare Table 93. Short instructions and functions Short instructions only Function CLR Clear INC, DEC Increment/decrement TNZ Test negative or zero CPL, NEG 1 or 2 complement BSET, BRES Bit operations BTJT, BTJF Bit test and jump operations SLL, SRL, SRA, RLC, RRC Shift and rotate operations SWAP Swap nibbles CALL, JP Call or jump subroutine Doc ID 11928 Rev 8 173/234 Instruction set 12.1.7 ST7L34 ST7L35 ST7L38 ST7L39 Relative mode (direct, indirect) This addressing mode is used to modify the PC register value, by adding an 8-bit signed offset to it. Table 94. Relative mode instructions (direct and indirect) Available relative direct/indirect instructions Function JRxx Conditional jump CALLR Call relative The relative addressing mode consists of two sub-modes: Relative (direct) The offset follows the opcode Relative (indirect) The offset is defined in memory, of which the address follows the opcode. 12.2 Instruction groups The ST7 family devices use an instruction set consisting of 63 instructions. The instructions may be subdivided into 13 main groups as illustrated in Table 95. Table 95. 174/234 Instruction groups Load and transfer LD CLR Stack operation PUSH POP Increment/decrement INC DEC Compare and tests CP TNZ BCP Logical operations AND OR XOR CPL NEG Bit operation BSET BRES Conditional bit test and branch BTJT BTJF Arithmetic operations ADC ADD SUB SBC MUL Shift and rotates SLL SRL SRA RLC RRC SWAP SLA Unconditional jump or call JRA JRT JRF JP CALL CALLR NOP Conditional branch JRxx Interruption management TRAP WFI HALT IRET Condition code flag modification SIM RIM SCF RCF Doc ID 11928 Rev 8 RSP RET ST7L34 ST7L35 ST7L38 ST7L39 12.2.1 Instruction set Using a prebyte 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 instructions in Y as well as indirect addressing modes to be implemented. They precede the opcode of the instructions in X or the instructions using direct addressing mode. The prebytes are: PDY 90 Replaces an X based instruction using immediate, direct, indexed, or inherent addressing mode by a Y one PIX 92 Replaces an instruction using direct, direct bit, or direct relative addressing mode by 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 12.2.2 Replaces an instruction using X indirect indexed addressing mode by a Y one Illegal opcode reset In order to provide the device with enhanced robustness against unexpected behavior, a system of illegal opcode detection is implemented. If a code to be executed does not correspond to any opcode or prebyte value, a reset is generated. This, combined with the watchdog, allows the detection and recovery from an unexpected fault or interference. Note: A valid prebyte associated with a valid opcode forming an unauthorized combination does not generate a reset. Doc ID 11928 Rev 8 175/234 Instruction set Table 96. ST7L34 ST7L35 ST7L38 ST7L39 Instruction set overview Mnemo. Description Function/example Dst Src H I N Z C ADC Add with carry A=A+M+C A M H N Z C ADD Addition A=A+M A M H N Z C AND Logical and A=A.M A M N Z BCP Bit compare A, memory tst (A . M) A M N Z BRES Bit reset bres Byte, #3 M BSET Bit set bset Byte, #3 M BTJF Jump if bit is false (0) btjf Byte, #3, Jmp1 M C BTJT Jump if bit is true (1) btjt Byte, #3, Jmp1 M C CALL Call subroutine CALLR Call subroutine relative CLR Clear CP Arithmetic compare tst(Reg - M) reg CPL One complement A = FFH-A DEC Decrement dec Y HALT Halt IRET Interrupt routine return Pop CC, A, X, PC INC Increment inc X JP Absolute jump jp [TBL.w] JRA Jump relative always JRT Jump relative JRF Never jump JRIH Jump if ext. interrupt = 1 JRIL Jump if ext. interrupt = 0 JRH Jump if H = 1 H=1? JRNH Jump if H = 0 H=0? JRM Jump if I = 1 I=1? JRNM Jump if I = 0 I=0? JRMI Jump if N = 1 (minus) N=1? JRPL Jump if N = 0 (plus) N=0? JREQ Jump if Z = 1 (equal) Z=1? JRNE Jump if Z = 0 (not equal) Z=0? JRC Jump if C = 1 C=1? JRNC Jump if C = 0 C=0? JRULT Jump if C = 1 Unsigned < JRUGE Jump if C = 0 Jmp if unsigned >= 176/234 reg, M 0 1 N Z C reg, M N Z 1 reg, M N Z N Z N Z M 0 H reg, M jrf * Doc ID 11928 Rev 8 I C ST7L34 ST7L35 ST7L38 ST7L39 Table 96. Instruction set Instruction set overview (continued) Mnemo. Description Function/example Dst Src JRUGT Jump if (C + Z = 0) Unsigned > JRULE Jump if (C + Z = 1) Unsigned <= LD Load dst <= src reg, M M, reg MUL Multiply X,A = X * A A, X, Y X, Y, A NEG Negate (2's compl) neg $10 reg, M NOP No operation OR OR operation A=A+M A M pop reg reg M POP Pop from the stack pop CC CC M M reg, CC H I N Z N Z 0 H C 0 I N Z N Z N Z C C PUSH Push onto the stack push Y RCF Reset carry flag C=0 RET Subroutine return RIM Enable interrupts I=0 RLC Rotate left true C C <= Dst <= C reg, M N Z C RRC Rotate right true C C => Dst => C reg, M N Z C RSP Reset stack pointer S = Max allowed SBC Subtract with carry A=A-M-C N Z C SCF Set carry flag C=1 SIM Disable interrupts I=1 SLA Shift left arithmetic C <= Dst <= 0 reg, M N Z C SLL Shift left logic C <= Dst <= 0 reg, M N Z C SRL Shift right logic 0 => Dst => C reg, M 0 Z C SRA Shift right arithmetic Dst7 => Dst => C reg, M N Z C SUB Subtraction A=A-M A N Z C SWAP SWAP nibbles Dst[7..4] <=> Dst[3..0] reg, M N Z TNZ Test for neg & zero tnz lbl1 N Z TRAP S/W trap S/W interrupt WFI Wait for Interrupt XOR Exclusive OR N Z 0 0 A M 1 1 M 1 0 A = A XOR M A Doc ID 11928 Rev 8 M 177/234 Electrical characteristics ST7L34 ST7L35 ST7L38 ST7L39 13 Electrical characteristics 13.1 Parameter conditions Unless otherwise specified, all voltages are referred to VSS. 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 = 25 C 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 (mean 3). 13.1.2 Typical values Unless otherwise specified, typical data are based on TA = 25 C, VDD = 5 V (for the 4.5 V VDD 5.5 V voltage range) and VDD = 3.3 V (for the 3 V VDD 3.6 V 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 70. Figure 70. Pin loading conditions ST7 pin CL 178/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 13.1.5 Electrical characteristics Pin input voltage The input voltage measurement on a pin of the device is described in Figure 71. Figure 71. Pin input voltage ST7 pin VIN 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 conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Doc ID 11928 Rev 8 179/234 Electrical characteristics 13.2.1 ST7L34 ST7L35 ST7L38 ST7L39 Voltage characteristics Table 97. Voltage characteristics Symbol VDD - VSS Ratings Maximum value Supply voltage Unit 7.0 V (1)(2) VIN Input voltage on any pin VSS - 0.3 to VDD + 0.3 VESD(HBM) Electrostatic discharge voltage (human body model) VESD(MM) Electrostatic discharge voltage (machine model) See Section 13.7.3: Absolute maximum ratings (electrical sensitivity) on page 198 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 must be made through a pull-up or pull-down resistor (typical: 4.7 k for RESET, 10 k for I/Os). Unused I/O pins must be tied in the same way to VDD or VSS according to their reset configuration. 2. IINJ(PIN) must never be exceeded. This is implicitly insured if VIN maximum is respected. If VIN maximum cannot be respected, the injection current must be limited externally to the IINJ(PIN) value. A positive injection is induced by VIN > VDD while a negative injection is induced by VIN < VSS. For true open-drain pads, there is no positive injection current and the corresponding VIN maximum must always be respected 13.2.2 Current characteristics Table 98. Symbol Current characteristics Ratings Maximum value IVDD Total current into VDD power lines (source)(1) 150 IVSS Total current out of VSS ground lines (sink)(1) 150 Output current sunk by any standard I/O and control pin 20 Output current sunk by any high sink I/O pin 40 IIO IINJ(PIN) (2)(3) Output current source by any I/Os and control pin - 25 Injected current on RESET pin 5 Injected current on OSC1 and OSC2 pins Injected current on any other pin IINJ(PIN)(2) (4) Total injected current (sum of all I/O and control pins)(4) Unit 5 mA mA 5 20 mA 1. All power (VDD) and ground (VSS) lines must always be connected to the external supply. 2. IINJ(PIN) must never be exceeded. This is implicitly insured if VIN maximum is respected. If VIN maximum cannot be respected, the injection current must be limited externally to the IINJ(PIN) value. A positive injection is induced by VIN > VDD while a negative injection is induced by VIN < VSS. 3. Negative injection disturbs the analog performance of the device. In particular, it induces leakage currents throughout the device including the analog inputs. To avoid undesirable effects on the analog functions, care must be taken: - Analog input pins must have a negative injection less than 0.8 mA (assuming that the impedance of the analog voltage is lower than the specified limits) - Pure digital pins must have a negative injection less than 1.6 mA. In addition, it is recommended to inject the current as far as possible from the analog input pins. 4. When several inputs are submitted to a current injection, the maximum IINJ(PIN) is the absolute sum of the positive and negative injected currents (instantaneous values). These results are based on characterization with IINJ(PIN) maximum current injection on four I/O port pins of the device. 180/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 13.2.3 Electrical characteristics Thermal characteristics Table 99. Thermal characteristics Symbol TSTG TJ Ratings Storage temperature range Value Unit -65 to +150 C Maximum junction temperature (see Table 129: Thermal characteristics on page 214) Doc ID 11928 Rev 8 181/234 Electrical characteristics ST7L34 ST7L35 ST7L38 ST7L39 13.3 Operating conditions 13.3.1 General operating conditions TA = -40 to +125 C unless otherwise specified. Table 100. General operating conditions Symbol Parameter Conditions Min. Max. Unit 3.0 5.5 V VDD = 3 to 3.3 V 0 8.8 MHz VDD = 3.3 to 5.5 V 0 16 MHz fOSC = 16 MHz max. TA = -40C to TA max. VDD Supply voltage fCLKIN External clock frequency on CLKIN pin TA Ambient temperature range A suffix version +85 -40 C suffix version C +125 Figure 72. fCLKIN maximum operating frequency vs VDD supply voltage Functionality guaranteed in this area (unless otherwise stated in the tables of parametric data) Refer to Section 13.3.4: Internal RC oscillator and PLL for PLL operating range fCLKIN [MHz] 16 Functionality not guaranteed in this area 8.8 4 1 0 Supply voltage [V] 2.0 2.7 3.0 3.3 3.5 4.0 4.5 5.0 5.5 1. For further information on clock management block diagram for fCLKIN description, refer to Figure 13: Clock management block diagram on page 40. 182/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics The RC oscillator and PLL characteristics are temperature-dependent. Table 101. Operating conditions (tested for TA = -40 to +125 C) @ VDD = 4.5 to 5.5 V Flash Symbol Parameter Unit Min. fRC(1) Internal RC oscillator frequency RC resolution ACCRC ROM Conditions Accuracy of internal RC oscillator with RCCR = RCCR0(2)(3) RCCR = FF (reset value), TA = 25 C, VDD = 5 V Typ. Max. Min. Typ. 630 RCCR = RCCR0(2), TA = -40 to 125 C, VDD = 5 V Max. 630 kHz 930 1000 1050 TBD 1000 TBD VDD = 5 V -1 +1 TBD TBD TA = -40 to +125 C, VDD = 5 V -3 +5 TBD TBD -4.5 +6.5 TBD TBD TA = -40 to +125 C, VDD = 4.5 V to 5.5 V(4) % 1. If the RC oscillator clock is selected, to improve clock stability and frequency accuracy, it is recommended to place a decoupling capacitor, typically 100nF, between the VDD and VSS pins as close as possible to the ST7 device. 2. See Section 7.1: Internal RC oscillator adjustment on page 37 3. Minimum value is obtained for hot temperature and maximum value is obtained for cold temperature 4. Data based on characterization results, not tested in production Table 102. Operating conditions (tested for TA = -40 to +125 C) @ VDD = 4.5 to 5.5 V Flash and ROM Symbol Parameter Conditions Unit Min. IDD(RC) Typ. 600(1)(2) RC oscillator current consumption TA = 25 C, VDD = 5 V RC oscillator setup time fPLL x8 PLL input clock 1 tLOCK PLL lock time(4) 2 ACCPLL x8 PLL accuracy JITPLL PLL jitter (fCPU/fCPU) IDD(PLL) PLL current consumption s MHz ms time(4) PLL stabilization A 10(3) tsu(RC) tSTAB Max. 4 fCLKIN/2 or fRC = 1 MHz @ TA = -40 to +125 C 0.2(5) % 1(6) TA = 25 C 550(2) A 1. Measurement made with RC calibrated at 1 MHz 2. Data based on characterization results, not tested in production 3. See Section 7.1: Internal RC oscillator adjustment on page 37 4. After the LOCKED bit is set ACCPLL is maximum 10% until tSTAB has elapsed. See Figure 12: PLL output frequency timing diagram on page 38. 5. Averaged over a 4ms period. After the LOCKED bit is set, a period of tSTAB is required to reach ACCPLL accuracy 6. Guaranteed by design Doc ID 11928 Rev 8 183/234 Electrical characteristics ST7L34 ST7L35 ST7L38 ST7L39 Figure 73. Typical accuracy with RCCR = RCCR0 vs. VDD = 4.5 to 5.5 V and temperature 3.00% 2.50% 2.00% Accuracy (%) 1.50% -45C 0C 25C 1.00% 90C 110C 0.50% 130C 0.00% -0.50% -1.00% 4.5 5 5.5 VDD (V) Figure 74. fRC vs. VDD and temperature for calibrated RCCR0 RCCR0 Typical behavior 1.1 Frequency (MHz) 1.05 -45C' 0C' 25C' 90C' 110C' 130C' 1 0.95 0.9 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 VDD supply (V) Table 103. Operating conditions (tested for TA = -40 to +125 C) @ VDD = 3.0 to 3.6 V Flash Symbol Parameter Unit Min. fRC(1) RCCR = FF (reset value), Internal RC oscillator TA = 25 C, VDD = 3.3 V frequency RCCR = RCCR(2), TA = -40 to +125 C, VDD = 3.3 V 184/234 ROM Conditions Doc ID 11928 Rev 8 Typ. Max. Min. Typ. Max. 630 630 kHz 970 1000 1050 TBD 1000 TBD ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics Table 103. Operating conditions (tested for TA = -40 to +125 C) @ VDD = 3.0 to 3.6 V Flash Symbol Parameter RC resolution ACCRC ROM Conditions Unit VDD = 3.3 V TA = -40 to +125 C, Accuracy of internal V = 3.3 V DD RC oscillator with RCCR = RCCR0(2)(3) TA = -40 to +125 C, VDD = 3.0 V to 3.6 V(4) Min. Typ. Max. Min. Typ. Max. -1 +1 TBD TBD -3 +5 TBD TBD -4 +6 TBD TBD % 1. If the RC oscillator clock is selected, to improve clock stability and frequency accuracy, it is recommended to place a decoupling capacitor, typically 100nF, between the VDD and VSS pins as close as possible to the ST7 device. 2. See Section 7.1: Internal RC oscillator adjustment on page 37. 3. Minimum value is obtained for hot temperature and max. value is obtained for cold temperature. 4. Data based on characterization results, not tested in production. Table 104. Operating conditions (tested for TA = -40 to +125 C) @ VDD = 3.0 to 3.6 V(1) Flash and ROM Parameter(1) Conditions Min. IDD(RC) RC oscillator current consumption tsu(RC) RC oscillator setup time Typ. Max. 500(2) A TA = 25 C, VDD = 3.3 V 10(2) s 1. Data based on characterization results, not tested in production. 2. Measurement made with RC calibrated at 1 MHz. Figure 75. Typical accuracy with RCCR = RCCR1 vs. VDD = 3 to 3.6 V and temperature 1.50% 1.00% -45C Accuracy (%) 0.50% 0C 25C 90C 110C 0.00% 130C -0.50% -1.00% 3 3.3 3.6 VDD (V) Doc ID 11928 Rev 8 185/234 Electrical characteristics ST7L34 ST7L35 ST7L38 ST7L39 Figure 76. fRC vs. VDD and temperature for calibrated RCCR1 RCCR1 Typical behavior 1.1 Frequency (MHz) 1.05 -45C' 0C' 25C' 90C' 110C' 130C' 1 0.95 0.9 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 VDD supply (V) Figure 77. PLL x 8 output vs. CLKIN frequency Output Frequency (MHz) 11.00 9.00 7.00 5.5 5 5.00 4.5 4 3.00 1.00 0.85 0.9 1 1.5 2 2.5 External Input Clock Frequency (MHz) 1. fOSC = fCLKIN/2*PLL8 13.3.2 Operating conditions with low voltage detector (LVD) TA = -40 to +125 C, unless otherwise specified Table 105. Operating conditions with low voltage detector Symbol 186/234 Conditions(1) Parameter VIT+(LVD) Reset release threshold (VDD rise) VIT-(LVD) Reset generation threshold (VDD fall) High threshold Min. Typ. Max. 3.60(2) 4.15 4.50 3.40 3.95 4.40(2) Unit V High threshold Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics Table 105. Operating conditions with low voltage detector Symbol Conditions(1) Parameter Vhys LVD voltage threshold hysteresis VIT+(LVD)-VIT-(LVD) VtPOR VDD rise time rate(3)(4) tg(VDD) Filtered glitch delay on VDD Min. Typ. Unit 200 mV 10000 20(2) Not detected by the LVD IDD(LVD) LVD/AVD current consumption Max. (2) s/V 150(5) ns 200 A 1. LVD functionality guaranteed only within the VDD operating range specified in Section 13.3.1: General operating conditions on page 182. 2. Not tested in production. 3. Not tested in production. The VDD rise time rate condition is needed to insure 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. 4. Use of LVD with capacitive power supply: With this type of power supply, if power cuts occur in the application, it is recommended to pull VDD down to 0 V to ensure optimum restart conditions. Refer to circuit example in Figure 97: RESET pin protection when LVD is disabled on page 206. 5. Based on design simulation. Doc ID 11928 Rev 8 187/234 Electrical characteristics 13.3.3 ST7L34 ST7L35 ST7L38 ST7L39 Auxiliary voltage detector (AVD) thresholds TA = -40 to +125C, unless otherwise specified Table 106. Auxiliary voltage detector (AVD) thresholds Symbol Conditions(1) Parameter Min. Typ. Max. Unit VIT + (AVD) 1 = >0 AVDF flag toggle threshold (VDD rise) VIT - (AVD) 0 = >1 AVDF flag toggle threshold (VDD fall) High threshold Vhys AVD voltage threshold hysteresis VIT + (AVD) - VIT - (AVD) 150 mV VIT- Voltage drop between AVD flag set and LVD reset activation VDD fall 0.45 V High threshold 3.85(2) 4.45 4.90 V 3.80 4.40 4.85(2) 1. LVD functionality guaranteed only within the VDD operating range specified in Figure 70: Pin loading conditions on page 178 2. Not tested in production 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). Table 107. Internal RC oscillator and PLL Symbol VDD(RC) VDD(x8PLL) 188/234 Parameter Internal RC Oscillator operating voltage x8 PLL operating voltage Conditions Refer to operating range of VDD with TA, Figure 70: Pin loading conditions on page 178 Doc ID 11928 Rev 8 Min. 3.0 Typ. Max. Unit 5.5 V 3.6 5.5 ST7L34 ST7L35 ST7L38 ST7L39 13.4 Electrical characteristics 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 obtain the total device consumption, the two current values must be added (except for halt mode for which the clock is stopped). 13.4.1 Supply current TA = -40 to +125C, unless otherwise specified Table 108. Supply current Symbol Parameter Supply current in run mode Supply current in wait mode IDD Conditions Typ. Max. fCPU = 8 MHz(2) 6 9 fCPU = 8 MHz(3) 2.4 4 Supply current in slow mode fCPU = 250 kHz(4) 0.7 1.1 Supply current in slow wait mode fCPU = 250 kHz(5) 0.6 1 (1) IDD Supply current in halt mode(6) (1) IDD Supply current in AWUFH mode(7)(8)(9) (1) IDD Supply current in active halt mode (1) -40C TA +85C -40C TA +125C -40C TA +85C -40C TA +125C -40C TA +125C Unit mA 10 <1 A 50 50 20 A 300 0.7 1 mA 1. VDD = 5.5 V 2. 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. 3. 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 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. 5. 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. 6. All I/O pins in output mode with a static value at VSS (no load), LVD disabled. Data based on characterization results, tested in production at VDD max. and fCPU max. 7. All I/O pins in input mode with a static value at VDD or VSS (no load). Data tested in production at VDD max. and fCPU max. 8. This consumption refers to the Halt period only and not the associated run period which is software dependent. 9. If low consumption is required, AWUFH mode is recommended. Doc ID 11928 Rev 8 189/234 Electrical characteristics ST7L34 ST7L35 ST7L38 ST7L39 8MHz 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 D 4MHz 1MHz TB Idd (mA) Figure 78. Typical IDD in run mode vs. fCPU 2.4 2.7 3.3 4 5 6 Vdd (V) 8MHz 800.00 4MHz 600.00 1MHz D 1000.00 400.00 200.00 0.00 TB Idd (A) Figure 79. Typical IDD in slow mode vs. fCPU 2.4 2.7 3.3 4 5 Vdd (V) Figure 80. Typical IDD in wait mode vs. fCPU 8MHz 2.5 4MHz Idd (mA) 2.0 1MHz 1.5 1.0 0.5 0.0 2.4 2.7 3.3 4 Vdd (V) 190/234 Doc ID 11928 Rev 8 5 6 6 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics Idd (A) Figure 81. Typical IDD in slow-wait mode vs. fCPU 8MHz 800.00 700.00 600.00 500.00 400.00 300.00 200.00 100.00 0.00 4MHz 1MHz 2.4 2.7 3.3 4 5 6 Vdd (V) Figure 82. Typical IDD vs. temperature at VDD = 5 V and fCLKIN = 16 MHz 6.00 5.00 RUN WAIT SLOW 3.00 SLOW-WAIT 2.00 1.00 0.00 -45 TB D Idd (mA) 4.00 25 90 110 Temperature (C) Figure 83. Typical IDD vs. temperature and VDD at fCLKIN = 16 MHz 6.00 Idd RUN (mA) 5.00 4.00 5 3.3 3.00 2.7 2.00 1.00 0.00 -45 25 90 130 Temperature (C) Doc ID 11928 Rev 8 191/234 Electrical characteristics 13.4.2 ST7L34 ST7L35 ST7L38 ST7L39 On-chip peripherals Table 109. On-chip peripherals Symbol Parameter IDD(AT) 12-bit autoreload timer supply current(1) IDD(SPI) SPI supply current(2) IDD(ADC) ADC supply current when converting(3) IDD(LINSCI) LINSCI supply current when transmitting(4) Conditions Typ. fCPU = 4 MHz VDD = 3.0 V 150 fCPU = 8 MHz VDD = 5 V 1000 fCPU = 4 MHz VDD = 3.0 V 50 fCPU = 8 MHz VDD = 5 V 200 VDD = 3.0 V 250 VDD = 5 V 1100 VDD = 5.0V 650 fADC = 4 MHz fCPU = 8 MHz Unit A A 1. Data based on a differential IDD measurement between reset configuration (timer stopped) and a timer running in PWM mode at fCPU = 8 MHz. 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. 4. Data based on a differential IDD measurement between LINSCI running at maximum speed configuration (500 Kbaud, continuous transmission of AA +RE enabled and LINSCI off. This measurement includes the pad toggling consumption. 192/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 13.5 Electrical characteristics Clock and timing characteristics Subject to general operating conditions for VDD, fOSC and TA. 13.5.1 General timings Table 110. General timings Symbol tc(INST) tv(IT) Parameter(1) Conditions Min. Typ.(2) Max. Unit 2 3 12 tCPU 250 375 1500 ns 10 22 tCPU 1.25 2.75 s Instruction cycle time Interrupt reaction time(3) tv(IT) = tc(INST) + 10 fCPU = 8 MHz 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. Doc ID 11928 Rev 8 193/234 Electrical characteristics 13.5.2 ST7L34 ST7L35 ST7L38 ST7L39 Crystal and ceramic resonator oscillators The ST7 internal clock can be supplied with four different crystal/ceramic resonator oscillators. All the information given in this paragraph are based on characterization results with specified typical external components. In the application, the resonator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and start-up stabilization time. Refer to the crystal/ceramic resonator manufacturer for more details (frequency, package, accuracy...). Table 111. Oscillator parameters Symbol Parameter fCrOSC Crystal oscillator frequency(1) CL1 CL2 Recommended load capacitance versus equivalent serial resistance of the crystal or ceramic resonator (RS) Conditions Min. Typ. 2 Max. Unit 16 MHz See Table 112: Typical ceramic resonator characteristics pF 1. When PLL is used, please refer to Section 7: Supply, reset and clock management (fCrOSC min. is 8 MHz with PLL). Table 112. Typical ceramic resonator characteristics Supplier fCrOSC (MHz) Typical ceramic resonators(1) Reference(2) Oscillator modes CL1 [pF] CL2 [pF] 2 CSTCC2M00G56-R0 LP or MP (47) (47) 4 CSTCR4M00G55-R0 MP or MS (39) (39) 8 CSTCE8M00G55-R0 MS or HS (33) (33) 16 CSTCE16M0V53-R0 HS (15) (15) Murata Supply voltage range (V) 3.0 V to 5.5 V 1. Resonator characteristics given by the ceramic resonator manufacturer. For more information on these resonators, please consult www.murata.com 2. SMD = [-R0: Plastic tape package ( = 180mm), -B0: Bulk] 194/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics 13.6 Memory characteristics 13.6.1 RAM and hardware registers TA = -40 to +125 C, unless otherwise specified. Table 113. RAM and hardware registers Symbol VRM Parameter Conditions Data retention mode(1) Halt mode (or reset) Min. Typ. Max. 1.6 Unit V 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). Not tested in production. 13.6.2 Flash program memory TA = -40 to +85C, unless otherwise specified. Table 114. Characteristics of dual voltage HDFlash memory Symbol VDD Parameter Conditions Refer to operating range of Operating voltage for Flash VDD with TA, Section 13.3.1: write/erase General operating conditions on page 182 Min. Max. Unit 5.5 V 5 10 ms 0.24 0.48 s 3.0 Programming time for 1~32 TA = -40 to +85 C bytes(1) tprog Typ. Programming time for 1.5 Kbytes TA = 25 C tRET(2) Data retention TA = 55 C(3) 20 Write erase cycles TPROG = 25 C 1K NRW TPROG = 85 C 300 Years Cycles Read/write/erase modes fCPU = 8 MHz, VDD = 5.5 V IDD Supply current 2.6(4) No read/no write mode mA 100 A Power down mode/halt 0 0.1 1. Up to 32 bytes can be programmed at a time 2. Data based on reliability test results and monitored in production 3. The data retention time increases when the TA decreases 4. Guaranteed by design. Not tested in production Doc ID 11928 Rev 8 195/234 Electrical characteristics 13.6.3 ST7L34 ST7L35 ST7L38 ST7L39 EEPROM data memory TA = -40 to +125C, unless otherwise specified. Table 115. Characteristics of EEPROM data memory Symbol Parameter Conditions VDD Operating voltage for EEPROM write/erase Refer to operating range of VDD with TA, Section 13.3.1: General operating conditions on page 182 tprog Programming time for 1~32 bytes TA = -40 to +125 C Data retention with 1 k cycling (TPROG = -40 to +125 C tRET(1) Data retention with 10 k cycling (TPROG = -40 to +125 C) Min. Typ. 3.0 5 Max. Unit 5.5 V 10 ms 20 TA = 55 C(2) Data retention with 100 k cycling (TPROG = -40 to +125 C) 10 Years 1 1. Data based on reliability test results and monitored in production 2. The data retention time increases when the TA decreases 13.7 Electromagnetic compatibility (EMC) characteristics Susceptibility tests are performed on a sample basis during product characterization. 13.7.1 Functional electromagnetic susceptibility (EMS) Based on a simple running application on the product (toggling 2 LEDs through I/O ports), the product is stressed by two electromagnetic events until a failure occurs (indicated by the LEDs). See Table 116: Electromagnetic test results on page 197. 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. FTB: A burst of fast transient voltage (positive and negative) is applied to VDD and VSS through a 100pF capacitor, until a functional disturbance occurs. This test conforms with the IEC 1000 - 4 - 4 standard. A device reset allows normal operations to be resumed. The test results are given in the table below based on the EMS levels and classes defined in application note AN1709. 196/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics Designing hardened software to avoid noise problems EMC characterization and optimization are performed at component level with a typical application environment and simplified MCU software. It should be noted that good EMC performance is highly dependent on the user application and the software in particular. Therefore it is recommended that the user applies EMC software optimization and prequalification tests in relation with the EMC level requested for his application. Software recommendations The software flowchart must include the management of runaway conditions such as: Corrupted program counter Unexpected reset Critical data corruption (control registers...) Prequalification trials Most of the common failures (unexpected reset and program counter corruption) can be reproduced by manually forcing a low state on the reset pin or the oscillator pins for 1 second. To complete these trials, ESD stress can be applied directly on the device, over the range of specification values. When unexpected behavior is detected, the software can be hardened to prevent unrecoverable errors occurring (see application note AN1015). Table 116. Electromagnetic test results Symbol 13.7.2 Level/ class Parameter Conditions VFESD Voltage limits to be applied on any I/O pin to induce a functional disturbance VDD = 5 V, TA = 25 C, fOSC = 8 MHz, conforms to IEC 1000-4-2 VFFTB Fast transient voltage burst limits to be applied through 100 pF on VDD and VDD pins to induce a functional disturbance VDD = 5 V, TA = 25 C, fOSC = 8 MHz, conforms to IEC 1000-4-4 3B Electromagnetic interference (EMI) Based on a simple application running on the product (toggling 2 LEDs through the I/O ports), the product is monitored in terms of emission. This emission test is in line with the norm SAE J 1752/3 which specifies the board and the loading of each pin. See Table 117: EMI emissions on page 197. Table 117. EMI emissions Sym. Parameter Conditions Monitored frequency band 0.1MHz to 30 MHz SEMI Peak level(1) VDD = 5 V, TA = 25 C, 30 MHz to 130 MHz SO20 package, conforming to SAE J 1752/3 130 MHz to 1 GHz SAE EMI level Max. vs. [fOSC/fCPU] Unit 8/4 MHz 16/8 MHz 15 15 13 19 9 13 2.5 3 dBV - 1. Data based on characterization results, not tested in production. Doc ID 11928 Rev 8 197/234 Electrical characteristics 13.7.3 ST7L34 ST7L35 ST7L38 ST7L39 Absolute maximum ratings (electrical sensitivity) Based on three different tests (ESD, DLU and LU) 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 application note AN1181. Electrostatic discharge (ESD) Electrostatic discharges (a positive then a negative pulse separated by 1 second) are applied to the pins of each sample according to each pin combination. The sample size depends on the number of supply pins in the device (3 parts*(n+1) supply pin). Two models can be simulated: the human body model and the machine model. This test conforms to the JESD22-A114A/A115A standard. Table 118. ESD absolute maximum ratings Symbol Ratings Conditions VESD(HBM) Electro-static discharge voltage (Human body model) VESD(MM) Electro-static discharge voltage (Machine model) VESD(CDM) Electro-static discharge voltage (Charged device model) Maximum value(1) Unit 4000 TA = +25 C V 400 1000 1. Data based on characterization results, not tested in production Static and dynamic latch-up (LU) LU: Three complementary static tests are required on 10 parts to assess the latch-up performance. A supply overvoltage (applied to each power supply pin) and a current injection (applied to each input, output and configurable I/O pin) are performed on each sample. This test conforms to the EIA/JESD 78 IC latch-up standard. For more details, refer to application note AN1181. DLU: Electro-Static Discharges (one positive then one negative test) are applied to each pin of three 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. For more details, refer to the application note AN1181. Electrical sensitivities Table 119. Latch up results Symbol Parameter Conditions LU Static latch-up class TA = 25 C TA = 125 C DLU Dynamic latch-up class VDD = 5.5 V, fOSC = 4 MHz, TA = 25 C Class(1) A 1. Class description: A class is an STMicroelectronics internal specification. All its limits are higher than the JEDEC specifications, which means when a device belongs to class A it exceeds the JEDEC standard. Class B strictly covers all the JEDEC criteria (international standard). Class B strictly covers all the JEDEC criteria (international standard) 198/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics 13.8 I/O port pin characteristics 13.8.1 General characteristics Subject to general operating conditions for VDD, fOSC, and TA (-40 to +125C), unless otherwise specified. Table 120. I/O general port pin characteristics Symbol Parameter Conditions Min. Typ. Max. Unit VIL Input low level voltage VSS - 0.3 0.3 x VDD VIH Input high level voltage 0.7 x VDD VDD + 0.3 Vhys Schmitt trigger voltage hysteresis(1) IL Input leakage current VSS VIN VDD IS Static current consumption induced by each floating input pin(2) Floating input mode RPU Weak pull-up equivalent resistor(3) VIN = VSS, VDD = 5 V CIO I/O pin capacitance tf(IO)out Output high to low level fall time(1) 400 V mV 1 A 400 50 tr(IO)out CL = 50 pF between 10% and 90% Output low to high level rise (1) time tw(IT)in External interrupt pulse time(4) 100 170 k 5 pF 25 ns 1 tCPU 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 84). Static peak current value taken at a fixed VIN value, based on design simulation and technology characteristics, not tested in production. This value depends on VDD and temperature values 3. The RPU pull-up equivalent resistor is based on a resistive transistor (corresponding IPU current characteristics described in Figure 84: Two typical applications with unused I/O pin on page 199) 4. To generate an external interrupt, a minimum pulse width must be applied on an I/O port pin configured as an external interrupt source. Figure 84. Two typical applications with unused I/O pin VDD ST7 10k 10k Unused I/O port Unused I/O port ST7 1. I/O can be left unconnected if it is configured as output (0 or 1) by the software. This has the advantage of greater EMC robustness and lower cost. Doc ID 11928 Rev 8 199/234 Electrical characteristics Caution: ST7L34 ST7L35 ST7L38 ST7L39 During normal operation the ICCCLK pin must be pulled up, internally or externally (external pull-up of 10 k mandatory in noisy environments). This is to avoid entering ICC mode unexpectedly during a reset. Figure 85. Typical IPU vs. VDD with VIN = VSS 90 Ta=140C 80 Ta=95C 70 Ta=25C Ta=-45C Ipu(uA) 60 50 TO BE CHARACTERIZED 40 30 20 10 0 2 13.8.2 2.5 3 3.5 4 4.5 Vdd(V) 5 5.5 6 Output driving current Subject to general operating conditions for VDD, fOSC, and TA (-40 to +125 C) unless otherwise specified. Table 121. Output driving current Symbol VOL(1) VOH(2) Parameter Conditions Output low level voltage for a standard I/O pin when eight pins are sunk at same time (see Figure 88) Output low level voltage for a high sink I/O pin when four pins are sunk at same time (see Figure 94) Output high level voltage for an I/O pin when four pins are sourced at same time (see Figure 94) VDD = 5 V Min. Typ. Max. IIO = +5 mA 1.0 IIO = +2 mA 0.4 IIO = +20 mA 1.4 IIO = +8 mA 0.75 Unit V IIO = -5 mA VDD - 1.5 IIO = -2 mA VDD - 1.0 1. The IIO current sunk must always respect the absolute maximum rating specified in Section 13.2.2: Current characteristics on page 180 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: Current characteristics on page 180 and the sum of IIO (I/O ports and control pins) must not exceed IVDD. 200/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics Figure 86. Typical VOL at VDD = 3 V -45C 25C 90C 110C 130C 3.5 3.0 2.5 TB D VOL(V) at VDD = 3V 4.0 2.0 1.5 1.0 0.5 0.0 0.01 1 2 3 4 5 6 4 5 6 4 5 6 lio (m A) Figure 87. Typical VOL at VDD = 4 V -45C 25C 90C 110C 130C 1.0 0.8 0.6 0.4 0.2 0.0 0.01 1 TB D VOL(V) at VDD = 4V 1.2 2 3 lio (m A) -45C 25C 90C 110C 130C D 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0.01 1 TB VOL(V) at VDD = 5V Figure 88. Typical VOL at VDD = 5 V 2 3 lio (m A) Doc ID 11928 Rev 8 201/234 Electrical characteristics ST7L34 ST7L35 ST7L38 ST7L39 Figure 89. Typical VOL at VDD = 3 V (high-sink) -45C 25C 90C 110C 130C 1.0 0.8 0.6 0.4 0.2 0.0 5 TB D VOL(V) at VDD = 3V (HS) 1.2 8 10 15 lio (m A) Figure 90. Typical VOL at VDD = 4 V (high-sink) -45C 25C 90C 110C 130C 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 5 TB D VOL(V) at VDD = 4V (HS) 0.9 8 10 15 lio (m A) Figure 91. Typical VOL at VDD = 5 V (high-sink) -45C 25C 90C 110C 130C 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 5 TB D VOL (V) at VDD = 5V (HS) 0.8 8 10 lio (m A) 202/234 Doc ID 11928 Rev 8 15 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics VDD - VOH at VDD = 3V Figure 92. Typical VDD - VOH at VDD = 3 V -45C 25C 90C 110C 130C 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -0.01 -1 -2 -3 -4 lio (m A) -45C 25C 90C 110C 130C D 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -0.01 -1 TB VDD - VOH at VDD = 4V Figure 93. Typical VDD - VOH at VDD = 4 V -2 -3 -4 -5 -6 -4 -5 -6 lio (m A) Figure 94. Typical VDD - VOH at VDD = 5 V -45C 25C 90C 110C 130C 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -0.01 -1 TB D VDD - VOH at VDD = 5V 1.8 -2 -3 lio (m A) Doc ID 11928 Rev 8 203/234 Electrical characteristics ST7L34 ST7L35 ST7L38 ST7L39 Figure 95. Typical VOL vs. VDD (standard I/Os) -45C 25C 90C 110C 130C 0.4 0.3 0.3 0.2 TB D Vol (V) at llo = 2mA 0.5 0.4 0.2 0.1 0.1 0.0 3 4 5 VDD (V) Typical VOL vs. VDD (standard I/Os) -45C 25C 90C 110C 130C 0.2 0.2 0.1 0.1 Vol (V) at llo = 15mA (HS) 0.3 -45C 25C 90C 110C 130C 1.2 D 0.3 TB Vol (V) at llo = 5mA (HS) 0.4 0.0 1.0 0.8 0.6 0.4 0.2 0.0 3 4 5 3 4 VDD (V) 5 VDD (V) 3.5 D 3.0 2.5 2.0 1.5 1.0 0.5 0.0 3 4 VDD - VOH (V) at llo = -2mA -45C 25C 90C 110C 130C 4.0 TB VDD - VOH (V) at llo = -5mA Figure 96. Typical VDD - VOH vs. VDD 5 VDD (V) 204/234 -45C 25C 90C 110C 130C 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 3 4 VDD (V) Doc ID 11928 Rev 8 5 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics 13.9 Control pin characteristics 13.9.1 Asynchronous RESET pin TA = -40 to +125 C, unless otherwise specified. Table 122. Asynchronous RESET pin Symbol Parameter Conditions Min. Typ. Max. Unit VIL Input low-level voltage Vss - 0.3 0.3 x VDD VIH Input high-level voltage 0.7 x VDD VDD + 0.3 Vhys Schmitt trigger voltage hysteresis(1) VOL Output low-level voltage(1) 1 VDD = 5 V IIO = +5 mA, TA +85 C TA +125 C 0.5 1.0(2) 1.2(2) IIO = +2 mA, TA +85 C TA +125 C 0.45 0.7(2) 0.9(2) 39 70 RON Pull-up equivalent resistor(1)(3) VDD = 5 V tw(RSTL)out Generated reset pulse duration Internal reset sources th(RSTL)in External reset pulse hold tg(RSTL)in Filtered glitch duration 10 V k 30 s time(4) 20 200 ns 1. The IIO current sunk must always respect the absolute maximum rating specified in Section 13.2.2: Current characteristics on page 180 and the sum of IIO (I/O ports and control pins) must not exceed IVSS. 2. Guaranteed by design. Not tested in production. 3. The RON pull-up equivalent resistor is based on a resistive transistor. Specified for voltages on RESET pin between VILmax and VDD. 4. To guarantee the reset of the device, a minimum pulse must be applied to the RESET pin. All short pulses applied on RESET pin with a duration below th(RSTL)in can be ignored. RESET circuit design recommendations The reset network protects the device against parasitic resets. 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). Whatever the reset source is (internal or external), the user must ensure that the level on the RESET pin can go below the VIL level specified in Section 13.9.1: Asynchronous RESET pin on page 205. Otherwise the reset is not taken into account internally. 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 is less than the absolute maximum value specified for IINJ(RESET) in Section 13.2.2: Current characteristics on page 180. Refer to Section 12.2.2: Illegal opcode reset on page 175 for details on illegal opcode reset conditions. Doc ID 11928 Rev 8 205/234 Electrical characteristics ST7L34 ST7L35 ST7L38 ST7L39 RESET pin protection when LVD is disabled Figure 97. RESET pin protection when LVD is disabled VDD ST7 RON User external reset circuit Internal reset Filter 0.01F Pulse generator Watchdog Illegal opcode Required RESET pin protection when LVD is enabled Figure 98. RESET pin protection when LVD Is enabled VDD Required Optional (note 3) External reset RON Internal reset Filter 0.01F Note: ST7 1M Pulse generator Watchdog Illegal opcode LVD reset When the LVD is enabled, it is recommended not to connect a pull-up resistor or capacitor. A 10nF pull-down capacitor is required to filter noise on the reset line. If a capacitive power supply is used, it is recommended to connect a 1 M pull-down resistor to the RESET pin to discharge any residual voltage induced by the capacitive effect of the power supply (this adds 5 A to the power consumption of the MCU). Tips when using the LVD 206/234 1. Check that all recommendations related to reset circuit have been applied (see RESET circuit design recommendations) 2. Check that the power supply is properly decoupled (100 nF + 10 F close to the MCU). Refer to AN1709. If this cannot be done, it is recommended to put a 100 nF + 1M pulldown on the RESET pin. 3. The capacitors connected on the RESET pin and also the power supply are key to avoiding any start-up marginality. In most cases, steps 1 and 2 above are sufficient for a robust solution. Otherwise: replace 10nF pull-down on the RESET pin with a 5 F to 20 F capacitor. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics 13.10 Communication interface characteristics 13.10.1 Serial peripheral interface (SPI) Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified. Refer to Section 10: I/O ports for more details on the input/output alternate function characteristics (SS, SCK, MOSI, MISO). Table 123. SPI characteristics Symbol fSCK = 1/ tc(SCK) tr(SCK) tsu(SS)(1) (1) Master, fCPU = 8 MHz SPI clock frequency Slave, fCPU = 8 MHz tw(SCKL) (1) tsu(MI)(1) tsu(SI)(1) th(MI)(1) th(SI)(1) ta(SO)(1) (1) Min. Max. Unit fCPU/128 = 0.0625 fCPU/4 = 2 0 fCPU/2 = 4 MHz See Table 2: Device pin description on page 17 SS setup time(2) Slave SS hold time tw(SCKH)(1) tdis(SO) Conditions SPI clock rise and fall time tf(SCK) th(SS) Parameter (4 x TCPU) + 50 120 Master 100 Slave 90 SCK high and low time Master Data input setup time Slave 100 ns Master Data input hold time Slave Data output access time 0 120 Slave Data output disable time tv(SO)(1) Data output valid time th(SO)(1) Data output hold time tv(MO)(1) Data output valid time th(MO)(1) Data output hold time 240 Slave (after enable edge) Master (after enable edge) 120 0 120 0 tCPU 1. Data based on design simulation, not tested in production. 2. Depends on fCPU. For example, if fCPU = 8 MHz, then tCPU = 1/fCPU = 125 ns and tsu(SS) = 550 ns. Doc ID 11928 Rev 8 207/234 Electrical characteristics ST7L34 ST7L35 ST7L38 ST7L39 Figure 99. SPI slave timing diagram with CPHA = 0 SS INPUT SCK INPUT tsu(SS) tc(SCK) th(SS) CPHA = 0 CPOL = 0 CPHA = 0 CPOL = 1 tw(SCKH) tw(SCKL) ta(SO) MISO OUTPUT see note 2 tv(SO) MSB OUT th(SO) tdis(SO) tr(SCK) tf(SCK) BIT6 OUT LSB OUT see note 2 th(SI) tsu(SI) MOSI INPUT MSB IN LSB IN BIT1 IN 1. Measurement points are made at CMOS levels: 0.3 x VDD and 0.7 x VDD 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. Figure 100. SPI slave timing diagram with CPHA = 1 SS INPUT SCK INPUT tsu(SS) tc(SCK) th(SS) CPHA = 1 CPOL = 0 CPHA = 1 CPOL = 1 tw(SCKH) tw(SCKL) ta(SO) MISO OUTPUT HZ tv(SO) MSB OUT see note 2 BIT6 OUT tr(SCK) tf(SCK) MSB IN tdis(SO) LSB OUT see note 2 th(SI) tsu(SI) MOSI INPUT th(SO) BIT1 IN LSB IN 1. Measurement points are made at CMOS levels: 0.3 x VDD and 0.7 x VDD. 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. 208/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics Figure 101. SPI master timing diagram SS INPUT tc(SCK) SCK INPUT CPHA = 0 CPOL = 0 CPHA = 0 CPOL = 1 CPHA=1 CPOL=0 CPHA = 1 CPOL = 1 tw(SCKH) tw(SCKL) tsu(MI) MISO INPUT th(MI) MSB IN BIT6 IN tv(MO) MOSI OUTPUT see note 2 tr(SCK) tf(SCK) MSB OUT LSB IN th(MO) BIT6 OUT LSB OUT see note 2 1. Measurement points are done at CMOS levels: 0.3 x VDD and 0.7 x VDD. 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. Doc ID 11928 Rev 8 209/234 Electrical characteristics 13.11 ST7L34 ST7L35 ST7L38 ST7L39 10-bit ADC characteristics Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified. Table 124. 10-bit ADC characteristics Symbol fADC Parameter Conditions ADC clock frequency (3) Min.(1) Typ.(2) Max.(1) 0.5 4 MHz VSSA VDDA V 10(4) k VAIN Conversion voltage range RAIN External input resistor CADC Internal sample and hold capacitor 6 Stabilization time after ADC enable (5) tSTAB pF 0 s Conversion time (sample+hold) tADC Unit - Sample capacitor loading time - Hold conversion time fCPU = 8 MHz, fADC = 4 MHz 3.5 4 10 1/fADC 1. Data based on characterization results, not tested in production 2. Unless otherwise specified, typical data is based on TA = 25 C and VDD - VSS = 5 V. They are given only as design guidelines and are not tested. 3. When VDDA and VSSA pins are not available on the pinout, the ADC refers to VDD and VSS 4. Any added external serial resistor downgrades the ADC accuracy (especially for resistance greater than 10k). Data based on characterization results, not tested in production. 5. The stabilization time of the AD converter is masked by the first tLOAD. The first conversion after the enable is then always valid. Figure 102. Typical application with ADC VDD RAIN VAIN ST7 VT 0.6V AINx 10-bit A/D conversion VT 0.6V IL 1A CADC Table 125. ADC accuracy with 4.5 V < VDD < 5.5 V Symbol Parameter Conditions Typ. Max.(1) |ET| Total unadjusted error 2.0 3.4 |EO| Offset error 0.4 1.7 |EG| Gain error 0.4 1.5 |ED| Differential linearity error 1.9 3.1 |EL| Integral linearity error 1.8 2.9 fCPU = 8 MHz, fADC = 4 MHz(2)(3) Unit LSB 1. Data based on characterization results, monitored in production to guarantee 99.73% within max value from -40 C to +125 C ( 3 distribution limits). 210/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Electrical characteristics 2. Data based on characterization results over the whole temperature range, monitored in production. 3. ADC accuracy vs. negative injection current: Injecting negative current on any of the analog input pins may reduce the accuracy of the conversion being performed on another analog input. The effect of negative injection current on robust pins is specified in Section 13.11: 10-bit ADC characteristics on page 210 Any positive injection current within the limits specified for IINJ(PIN) and IINJ(PIN) in Section 13.8: I/O port pin characteristics on page 199 does not affect the ADC accuracy. Table 126. ADC accuracy with 3 V < VDD < 3.6 V Symbol Parameter Conditions |ET| Total unadjusted error |EO| Offset error fCPU = 4 MHz, fADC = 2 Typ. Max.(1) 1.9 3.1 0.3 1.2 0.3 1 MHz(2)(3) |EG| Gain error |ED| Differential linearity error 1.8 3 |EL| Integral linearity error 1.7 2.8 Unit LSB 1. Data based on characterization results, monitored in production to guarantee 99.73% within max value from -40 C to +125 C ( 3 distribution limits). 2. Data based on characterization results over the whole temperature range, monitored in production. 3. ADC accuracy vs. negative injection current: Injecting negative current on any of the analog input pins may reduce the accuracy of the conversion being performed on another analog input. The effect of negative injection current on robust pins is specified in Section 13.11: 10-bit ADC characteristics on page 210 Any positive injection current within the limits specified for IINJ(PIN) and IINJ(PIN) in Section 13.8: I/O port pin characteristics on page 199 does not affect the ADC accuracy. Figure 103. ADC accuracy characteristics Digital result ADCDR EG 1023 V -V DD SS 1LSB = -------------------------------IDEAL 1024 1022 1021 (2) (1) = Example of an actual transfer curve ET (3) 7 (1) 6 5 EO 4 (3) = End point correlation line EL 3 (2) = Ideal transfer curve ED 2 1 LSBIDEAL 1 0 VSS Vin (LSBIDEAL) 1 2 3 4 5 6 7 10211022 1023 1024 VDD 1. Legend: 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 Doc ID 11928 Rev 8 211/234 Package characteristics 14 ST7L34 ST7L35 ST7L38 ST7L39 Package characteristics In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at www.st.com. 14.1 Package mechanical data Figure 104. 20-pin plastic small outline package, 300-mil width h x 45x D L A B e A1 c E H Table 127. 20-pin plastic small outline package, 300-mil width, mechanical data mm inches Dim. Min. Max. Min. Typ. Max. A 2.35 2.65 0.093 0.104 A1 0.10 0.30 0.004 0.012 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.013 D 12.60 13.00 0.496 0.512 E 7.40 7.60 0.291 0.299 e 212/234 Typ. 1.27 0.050 H 10.00 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 0 8 0 8 L 0.40 1.27 0.016 0.050 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Package characteristics Figure 105. QFN 5x6, 20-terminal very thin fine pitch quad flat no-lead package D2 D D2/2 Nx L 1 2 E2/2 (NE - 1) x e E E2 2 1 Pin 1 ID R0.20 2X K Nx b e 2X See detail A (ND - 1) x e Top view Bottom view Seating plane A A1 A3 CL Side view CL L L e e e/2 Terminal tip For even terminal side For odd terminal side Detail A Table 128. QFN 5x6: 20-terminal very thin fine pitch quad flat no-lead package mm inches Dim. Min. e Typ. Max. Min. 0.80 Typ. Min. 0.0315 L 0.45 0.50 0.55 0.0177 0.0197 0.0217 b(1) 0.25 0.30 0.35 0.0098 0.0118 0.0138 D2 3.30 3.40 3.50 0.1299 0.1339 0.1378 E2 4.30 4.40 4.50 0.1693 0.1732 0.1772 D 5.00 0.1969 E 6.00 0.2362 A 0.80 0.85 0.90 0.0315 0.0335 0.0354 A1 0.00 0.02 0.05 0.0000 0.0008 0.0020 A3 0.02 0.0008 K 0.20 0.0079 (2) 20 N Doc ID 11928 Rev 8 213/234 Package characteristics ST7L34 ST7L35 ST7L38 ST7L39 Table 128. QFN 5x6: 20-terminal very thin fine pitch quad flat no-lead package ND(3) 4 NE(3) 6 1. Dimension b applies to metallized terminals and is measured between 0.15 and 0.30 mm from terminal TIP. If the terminal has the optional radius on the other end of the terminal the dimension b should not be measured in that radius area. 2. N is the total number of terminals 3. ND and NE refer to the number of terminals on each D and E side respectively 14.2 Packaging for automatic handling The devices can be supplied in trays or with tape and reel conditioning. Tape and reel conditioning can be ordered with pin 1 left-oriented or right-oriented when facing the tape sprocket holes as shown in Figure 106. Figure 106. pin 1 orientation in tape and reel conditioning Left orientation Right orientation (EIA 481-C compliant) Pin 1 Pin 1 See also Figure 107: ST7FL3x Flash commercial product structure on page 220 and Figure 108: ST7FL3x FASTROM commercial product structure on page 221. 14.3 Thermal characteristics Table 129. Thermal characteristics Symbol Parameter RthJA Package thermal resistance (junction to ambient) TJmax Maximum junction temperature(1) PDmax Maximum power dissipation(2) Package Value SO20 70 QFN20 30 Unit C/W SO20 150 C QFN20 SO20 < 350 QFN20 < 800 mW 1. The maximum chip-junction temperature is based on technology characteristics 2. The maximum power dissipation is obtained from the formula PD = (TJ -TA)/RthJA. The power dissipation of an application can be defined by the user with the formula: PD = PINT + PPORT, where PINT is the chip internal power (IDD x VDD) and PPORT is the port power dissipation depending on the ports used in the application. 214/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Device configuration and ordering information 15 Device configuration and ordering information 15.1 Introduction Each device is available for production in user programmable versions (Flash) as well as in factory coded versions (ROM). ST7L3x devices are ROM versions. ST7PL3x devices are factory advanced service technique ROM (FASTROM) versions: They are factory programmed Flash devices. ST7FL3 Flash devices are shipped to customers with a default program memory content (FFh), while ROM/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 ROM/FASTROM devices are factory-configured. 15.2 Option bytes The two option bytes allow the hardware configuration of the microcontroller to be selected. Differences in option byte configuration between Flash and ROM devices are presented in Table 130 and are described in Section 15.2.1: Flash option bytes on page 216 and Section 15.2.2: ROM option bytes on page 217. Table 130. Flash and ROM option bytes Option byte 0 7 6 5 4 Flash AW UCK Name OSCRANGE 2:0 3 2 SEC SEC 1 0 1 1 1 0 FM PR FM PW 7 ROP ROP _R _D Res 1 1 Res ROM Default value Option byte 1 1 1 0 0 1(1) 6 5 4 3 2 1 0 PLL WDG WDG Res OSC LVD 1:0 OFF SW HALT 1 0(1) 0 1 1 1 1 1. Contact your STMicroelectronics support Doc ID 11928 Rev 8 215/234 Device configuration and ordering information 15.2.1 ST7L34 ST7L35 ST7L38 ST7L39 Flash option bytes Table 131. Option byte 0 description Bit 7 6:4 3:2 1 0 216/234 Bit name AWUCK OSCRANGE [2:0] SEC[1:0] Function Auto wake up clock selection 0: 32 kHz oscillator (VLP) selected as AWU clock 1: AWU RC oscillator selected as AWU clock. Note: If this bit is reset, the internal RC oscillator must be selected (option OSC = 0). Oscillator range When the internal RC oscillator is not selected (Option OSC = 1), these option bits select the range of the resonator oscillator current source or the external clock source. 000: Typ. frequency range with resonator (LP) = 1~2 MHz 001: Typ. frequency range with resonator (MP) = 2~4 MHz) 010: Typ. frequency range with resonator (MS) = 4~8 MHz) 011: Typ. frequency range with resonator (HS) = 8~16 MHz) 100: Typ. frequency range with resonator (VLP) = 32.768~ kHz) 101: External clock on OSC1 110: Reserved 111: External clock on PB4 Note: OSCRANGE[2:0] has no effect when AWUCK option is set to 0. In this case, the VLP oscillator range is automatically selected as AWU clock. Sector 0 size definition These option bits indicate the size of sector 0 as follows: 00: Sector 0 size = 0.5 Kbytes 01: Sector 0 size = 1 Kbyte 10: Sector 0 size = 2 Kbytes 11: Sector 0 size = 4 Kbytes FMP_R Readout protection Readout protection, when selected provides a protection against program memory content extraction and against write access to Flash memory. 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 the ST7 Flash Programming Reference Manual and Section 4.5: Memory protection on page 25 for more details. 0: Readout protection off 1: Readout protection on 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 Note: The option bytes have no address in the memory map and are accessed only in programming mode (for example using a standard ST7 programming tool). The default content of the Flash is fixed to FFh. Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Device configuration and ordering information Table 132. Option byte 1 description Bit 7 Bit name Function - 6 PLLOFF 5 - Reserved, must be set to 1(1) PLL disable This option bit enables or disables the PLL. 0: PLL enabled 1: PLL disabled (bypassed) Reserved, must be set to 0(1) OSC RC oscillator selection This option bit enables selection of the internal RC oscillator. 0: RC oscillator on 1: RC oscillator off Note: To improve clock stability and frequency accuracy when the RC oscillator is selected, it is recommended to place a decoupling capacitor, typically 100 nF, between the VDD and VSS pins as close as possible to the ST7 device. 3:2 LVD[1:0] Low voltage selection These option bits enable the voltage detection block (LVD and AVD) with a selected threshold to the LVD and AVD: 11: LVD off 10: LVD on (highest voltage threshold) 1 WDGSW Hardware or software watchdog 0: Hardware (watchdog always enabled) 1: Software (watchdog to be enabled by software) 0 WDGHALT 4 Watchdog reset on halt 0: No reset generation when entering halt mode 1: Reset generation when entering halt mode 1. Contact your local STMicroelectronics sales office. 15.2.2 ROM option bytes Table 133. Option byte 0 description Bit 7 Bit name AWUCK Function Auto wake up clock selection 0: 32 kHz oscillator (VLP) selected as AWU clock 1: AWU RC oscillator selected as AWU clock. Note: If this bit is reset, the internal RC oscillator must be selected (option OSC = 0). Doc ID 11928 Rev 8 217/234 Device configuration and ordering information ST7L34 ST7L35 ST7L38 ST7L39 Table 133. Option byte 0 description Bit 6:4 Bit name Oscillator range When the internal RC oscillator is not selected (option OSC = 1), these option bits select the range of the resonator oscillator current source or the external clock source. 000: Typ. frequency range with resonator (LP) = 1~2 MHz 001: Typ. frequency range with resonator (MP) = 2~4 MHz) 010: Typ. frequency range with resonator (MS) = 4~8 MHz) OSCRANGE[2:0] 011: Typ. frequency range with resonator (HS) = 8~16 MHz) 100: Typ. frequency range with resonator (VLP) = 32.768~ kHz) 101: External clock on OSC1 110: Reserved 111: External clock on PB4 Note: OSCRANGE[2:0] has no effect when AWUCK option is set to 0. In this case, the VLP oscillator range is automatically selected as AWU clock 3:2 1 0 Function - Reserved, must be set to 1 ROP_R Readout protection for ROM This option is for read protection of ROM 0: Readout protection off 1: Readout protection on ROP_D Readout protection for data EEPROM This option is for read protection of EEPROM memory. 0: Readout protection off 1: Readout protection on Table 134. Option byte 1 description Bit 7 - 6 PLLOFF 5 - 4 3:2 218/234 Bit name Function Reserved, must be set to 1(1) PLL disable This option bit enables or disables the PLL. 0: PLL enabled 1: PLL disabled (bypassed) Reserved, must be set to 0(1) OSC RC oscillator selection This option bit enables selection of the internal RC oscillator. 0: RC oscillator on 1: RC oscillator off Note: To improve clock stability and frequency accuracy when the RC oscillator is selected, it is recommended to place a decoupling capacitor, typically 100 nF, between the VDD and VSS pins as close as possible to the ST7 device. LVD[1:0] Low voltage selection These option bits enable the voltage detection block (LVD and AVD) with a selected threshold to the LVD and AVD: 11: LVD off 10: LVD on (highest voltage threshold) Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Device configuration and ordering information Table 134. Option byte 1 description Bit Bit name 1 WDGSW 0 WDGHALT Function Hardware or software watchdog 0: Hardware (watchdog always enabled) 1: Software (watchdog to be enabled by software) Watchdog reset on halt 0: No reset generation when entering halt mode 1: Reset generation when entering halt mode 1. Contact your STMicroelectronics support 15.3 Device ordering information and transfer of customer code Customer code is made up of the ROM/FASTROM contents and the list of the selected options (if any). The ROM/FASTROM contents are to be sent on a 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 on page 223. 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. Doc ID 11928 Rev 8 219/234 Device configuration and ordering information ST7L34 ST7L35 ST7L38 ST7L39 Figure 107. ST7FL3x Flash commercial product structure Example: ST7 F L34 F 2 M A X S Product class ST7 microcontroller Family type F = Flash Sub-family type L34 = without data EEPROM, without LIN L35 = without data EEPROM, with LIN L38 = with data EEPROM, without LIN L39 = with data EEPROM, with LIN Pin count F = 20 pins Program memory size 2 = 8 Kbytes Package type M = SO U = QFN Temperature range A = -40 C to 85 C C = -40 C to 125 C Tape and Reel conditioning options (left blank if Tray) TR or R = Pin 1 left-oriented TX or X = Pin 1 right-oriented (EIA 481-C compliant) ECOPACK/Fab code Blank or E = Lead-free ECOPACK(R) Phoenix Fab S = Lead-free ECOPACK(R) Catania Fab 1. For a list of available options (e.g. memory size, package) and orderable part numbers or for further information on any aspect of this device, please go to www.st.com or contact the ST Sales Office nearest to you. 220/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Device configuration and ordering information Figure 108. ST7FL3x FASTROM commercial product structure Example: ST7 P L34 M A /xxx X S Product class ST7 microcontroller Family type P = FASTROM Sub-family type L34 = without data EEPROM, without LIN L35 = without data EEPROM, with LIN L38 = with data EEPROM, without LIN L39 = with data EEPROM, with LIN Package type M = SO U = QFN Temperature range A = -40 C to 85 C C = -40 C to 125 C Code name Defined by STMicroelectronics. Denotes ROM code, pinout and program memory size. Tape and Reel conditioning options (left blank if Tray) TR or R = Pin 1 left-oriented TX or X = Pin 1 right-oriented (EIA 481-C compliant) ECOPACK/Fab code Blank or E = Lead-free ECOPACK(R) Phoenix Fab S = Lead-free ECOPACK(R) Catania Fab Doc ID 11928 Rev 8 221/234 Device configuration and ordering information ST7L34 ST7L35 ST7L38 ST7L39 Figure 109. ROM commercial product code structure Example: ST7 L34 M Product class ST7 microcontroller Sub-family type L34 = without data EEPROM, without LIN L35 = without data EEPROM, with LIN L38 = with data EEPROM, without LIN L39 = with data EEPROM, with LIN Package type M = SO U = QFN Temperature range A = -40 C to 85 C C = -40 C to 125 C Code name Defined by STMicroelectronics. Denotes ROM code, pinout and program memory size. Tape and Reel conditioning options (left blank if Tray) TR or R = Pin 1 left-oriented TX or X = Pin 1 right-oriented (EIA 481-C compliant) ECOPACK/Fab code Blank or E = Lead-free ECOPACK(R) Phoenix Fab S = Lead-free ECOPACK(R) Catania Fab 222/234 Doc ID 11928 Rev 8 A /xxx X S ST7L34 ST7L35 ST7L38 ST7L39 Device configuration and ordering information ST7L3 FASTROM and ROM microcontroller option list (Last update: October 2007) Customer: Address: ..................................................................... ..................................................................... ..................................................................... Contact: ..................................................................... Phone No: ..................................................................... Reference/FASTROM or ROM code: ............................... The FASTROM/ROM code name is assigned by STMicroelectronics. FASTROM/ROM code must be sent in .S19 format. .Hex extension cannot be processed. Device type/memory size/package (check only one option): --------------------------------------------------------------------------------------------FASTROM device 8K | SO20 | QFN20 --------------------------------------------------------------------------------------------| [ ] ST7PL34F2M | [ ] ST7PL34F2U | [ ] ST7PL35F2M | [ ] ST7PL35F2U | [ ] ST7PL38F2M | [ ] ST7PL38F2U | [ ] ST7PL39F2M | [ ] ST7PL39F2U -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ROM device 8K | SO20 | QFN20 ---------------------------------------------------------------------------------------------| [ ] ST7L34F2M | [ ] ST7L34F2U | [ ] ST7L35F2M | [ ] ST7L35F2U | [ ] ST7L38F2M | [ ] ST7L38F2U | [ ] ST7L39F2M | [ ] ST7L39F2U ----------------------------------------------------------------------------------------------Conditioning: (check only one option) [ ] Tape and reel [ ] Tube Special marking: [ ] No [ ] Yes ".........................." Authorized characters are letters, digits, '.', '-', '/' and spaces only. Maximum character count: SO20 (8 char. max): .......................... QFN20 (8 char. max): .......................... Temperature range: AWUCK selection: Clock source selection: [ ] A (-40 to +85 C) [ ] 32 kHz oscillator [ ] Resonator [ ] External clock [ ] C (-40 to +125 C) [ ] AWU RC oscillator [ ] VLP: Very low power resonator (32 to 100 kHz) [ ] LP: Low power resonator (1 to 2 MHz) [ ] MP: Medium power resonator (2 to 4 MHz) [ ] MS: Medium speed resonator (4 to 8 MHz) [ ] HS: High speed resonator (8 to 16 MHz) [ ] on PB4 [ ] on OSCI PLL: LVD reset threshold: Watchdog selection: Watchdog reset on halt: [ ] Internal RC oscillator [ ] Disabled [ ] Disabled [ ] Software activation [ ] Disabled [ ] Enabled [ ] Enabled (highest voltage threshold) [ ] Hardware activation [ ] Enabled Flash devices only: Sector 0 size: Readout protection: Flash write protection: [ ] 0.5 K [ ] Disabled [ ] Disabled []1K [ ] Enabled [ ] Enabled ROM devices only ROM readout protection: [ ] Disabled EEDATA readout protection:[ ] Disabled [ ] Enabled [ ] Enabled Comments: Supply operating range in the application: Notes: Date: Signature: ............................. ............................. ............................. ............................. ........................... []2K []4K 1. Not all configurations are available. See Section 15.2: Option bytes on page 215 for authorized option byte combinations. Doc ID 11928 Rev 8 223/234 Device configuration and ordering information 15.4 Development tools 15.4.1 Starter Kits ST7L34 ST7L35 ST7L38 ST7L39 ST offers complete, affordable starter kits. Starter kits are complete, affordable hardware/software tool packages that include features and samples to help you quickly start developing your application. 15.4.2 Development and debugging tools Application development for ST7 is supported by fully optimizing C compilers and the ST7 assembler-linker toolchain, which are all seamlessly integrated in the ST7 integrated development environments in order to facilitate the debugging and fine-tuning of your application. The cosmic C compiler is available in a free version that outputs up to 16 Kbytes of code. The range of hardware tools includes full featured ST7-EMU3 series emulators, cost effective ST7-DVP3 series emulators and the low-cost RLink in-circuit debugger/programmer. These tools are supported by the ST7 Toolset from STMicroelectronics, which includes the STVD7 integrated development environment (IDE) with high-level language debugger, editor, project manager and integrated programming interface. 15.4.3 Programming tools During the development cycle, the ST7-DVP3 and ST7-EMU3 series emulators and the RLink provide in-circuit programming capability for programming the Flash microcontroller on your application board. ST also provides a low-cost dedicated in-circuit programmer, the ST7-STICK, as well as ST7 socket boards which provide all the sockets required for programming any of the devices in a specific ST7 subfamily on a platform that can be used with any tool with incircuit programming capability for ST7. For production programming of ST7 devices, ST's third-party tool partners also provide a complete range of gang and automated programming solutions, which are ready to integrate into your production environment. 224/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 15.4.4 Device configuration and ordering information Order codes for development and programming tools Table 135 below lists the ordering codes for the ST7L3x development and programming tools. For additional ordering codes for spare parts and accessories, refer to the online product selector at www.st.com/mcu. Table 135. ST7L3 development and programming tools In-circuit debugger, RLink series(1) Supported products Emulator Starter kit with demo board Starter kit without demo board DVP series EMU series ST7FLITESK/RAIS(2)(3) STXRLINK(2)(3) ST7MDT10DVP3(4) ST7MDT10 -EMU3 Programming tool ST socket In-circuit boards and programmer EPBs ST7FL34 ST7FL35 ST7FL38 ST7-STICK STX-RLINK (4)(5) ST7SB10123(4) ST7FL39 1. Available from ST or from Raisonance 2. USB connection to PC 3. Parallel port connection to PC 4. Add suffix /EU, /UK or /US for the power supply for your region 5. Includes connection kit for DIP16/SO16 only. See "How to order an EMU or DVP" in ST product and tool selection guide for connection kit ordering information Doc ID 11928 Rev 8 225/234 Important notes ST7L34 ST7L35 ST7L38 ST7L39 16 Important notes 16.1 Clearing active interrupts outside interrupt routine When an active interrupt request occurs at the same time as the related flag or interrupt mask is being cleared, the CC register may be corrupted. Concurrent interrupt context The symptom does not occur when the interrupts are handled normally, that is, when: The interrupt request is cleared (flag reset or interrupt mask) within its own interrupt routine The interrupt request is cleared (flag reset or interrupt mask) within any interrupt routine The interrupt request is cleared (flag reset or interrupt mask) in any part of the code while this interrupt is disabled If these conditions are not met, the symptom is avoided by implementing the following sequence: Perform SIM and RIM operation before and after resetting an active interrupt request. Example: SIM Reset flag or interrupt mask RIM 16.2 LINSCI limitations 16.2.1 Header time-out does not prevent wake-up from mute mode Normally, when LINSCI is configured in LIN slave mode, if a header time-out occurs during a LIN header reception (that is, header length > 57 bits), the LIN header error bit (LHE) is set, an interrupt occurs to inform the application but the LINSCI should stay in mute mode, waiting for the next header reception. Problem description The LINSCI sampling period is Tbit/16. If a LIN header time-out occurs between the 9th and the 15th sample of the identifier field stop bit (refer to Figure 110), the LINSCI wakes up from mute mode. Nevertheless, LHE is set and LIN header detection flag (LHDF) is kept cleared. In addition, if LHE is reset by software before this 15th sample (by accessing the SCISR register and reading the SCIDR register in the LINSCI interrupt routine), the LINSCI will generate another LINSCI interrupt (due to the RDRF flag setting). 226/234 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Important notes Figure 110. Header reception event sequence LIN synch break LIN synch field Identifier field THEADER ID field STOP bit Critical window Active mode is set (RWU is cleared) RDRF flag is set Impact on application Software may execute the interrupt routine twice after header reception. Moreover, in reception mode, as the receiver is no longer in mute mode, an interrupt is generated on each data byte reception. Workaround The problem can be detected in the LINSCI interrupt routine. In case of time-out error (LHE is set and LHLR is loaded with 00h), the software can check the RWU bit in the SCICR2 register. If RWU is cleared, it can be set by software (refer to Figure 111). The workaround is shown in bold characters. Figure 111. LINSCI interrupt routine @interrupt void LINSCI_IT ( void ) /* LINSCI interrupt routine */ { /* clear flags */ SCISR_buffer = SCISR; SCIDR_buffer = SCIDR; if ( SCISR_buffer & LHE )/* header error ? */ { if (!LHLR)/* header time-out? */ { if ( !(SCICR2 & RWU) )/* active mode ? */ { _asm("sim");/* disable interrupts */ SCISR; SCIDR;/* Clear RDRF flag */ SCICR2 |= RWU;/* set mute mode */ SCISR; SCIDR;/* Clear RDRF flag */ SCICR2 |= RWU;/* set mute mode */ _asm("rim");/* enable interrupts */ } } } } Example using Cosmic compiler syntax Doc ID 11928 Rev 8 227/234 Revision history 17 ST7L34 ST7L35 ST7L38 ST7L39 Revision history Table 136. Revision history Date Revision Jun-2004 1 First release 2 Changed temperature range (added -40 to +125C) Removed references to 1% internal RC accuracy; Changed Figure 4: Memory map on page 19 Removed reference to amplifier for ADCDRL in Table 3: Hardware register map on page 20 and in Section 11.6.6: Register description on page 166 and replaced "Data register low" by "Control and data register low"; Changed Section 4.4: ICC interface on page 23 and added note 6 Modified note on clock stability and on ICC mode in Section 7.1: Internal RC oscillator adjustment on page 37 Added text in note 1 in Table 7: RCCR calibration registers on page 37 Added RCCR1 (Figure 4 on page 19 and Section 7: Supply, reset and clock management on page 37) Added note to Section 7.5: Reset sequence manager (RSM) on page 42; Added note 3 after Table 24: I/O port mode options on page 70 Exit from halt mode during an overflow event set to `no' in Section 11.2.4: Low power modes on page 88 Removed watchdog section in Section 11.3: Lite timer 2 (LT2) on page 101 Table 48: Effect of low power modes on lite timer 2 on page 104 and Table 49: Lite timer 2 interrupt control/wake-up capability on page 104 expanded Added important note in Master mode operation on page 111 Changed procedure description in Transmitter on page 126 In Extended baud rate generation on page 130: Corrected equation for Rx to read: Rx = fCPU/(16 x ERPR x PR x RR), {instead of Rx = fCPU/(16 x ERPR x PR x TR)} Added note on illegal opcode reset to Section 12.2.2: Illegal opcode reset on page 175; Changed Section 13.1.2: Typical values on page 178 Changed electrical characteristics in the following sections: Section 13.3: Operating conditions on page 182, Section 13.4: Supply current characteristics on page 189, Section 13.6: Memory characteristics on page 195, Section 13.7.3: Absolute maximum ratings (electrical sensitivity) on page 198, Section 13.8: I/O port pin characteristics on page 199, Section 13.9: Control pin characteristics on page 205, Section 13.10: Communication interface characteristics on page 207 and Section 13.11: 10-bit ADC characteristics on page 210 Modified Section 14: Package characteristics on page 212 Changed Section 15.2: Option bytes on page 215 (OPT 5 of option byte 1), Section 15.3: Device ordering information and transfer of customer code on page 219 and Section 15.4: Development tools on page 224 Changed option list, Added Section 16: Important notes on page 226 23-Dec-2005 228/234 Changes Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Revision history Table 136. Revision history (continued) Date 06-Mar-2006 Revision Changes 3 Removed all x4 PLL option references from document Changed Read operation section in Section 5.3: Memory access on page 28 Changed note Figure 8: Data EEPROM write operation on page 29. Changed Section 5.5: Access error handling on page 30 Replaced 3.3 V with 3.6 V in Section 7.2: Phase locked loop on page 38 Changed Master mode operation on page 111: added important note Changed Section 13.1.2: Typical values on page 178 Changed Section 13.3.1: General operating conditions on page 182 and added note on clock stability and frequency accuracy; removed the following figure: PLL fCPU/fCPU vs time Changed Section 13.3.2: Operating conditions with low voltage detector (LVD) on page 186 and Section 13.3.4: Internal RC oscillator and PLL on page 188 Changed Section 13.4.1: Supply current on page 189 and added notes Changed Table 115: Characteristics of EEPROM data memory on page 196 Removed note 6 from Section 13.6: Memory characteristics on page 195 Changed Section 13.6.2: Flash program memory on page 195; Changed Section 13.6.3: EEPROM data memory on page 196 Changed values in Section 13.7.2: Electromagnetic interference (EMI) on page 197 Changed absolute maximum ratings in Table 118: ESD absolute maximum ratings on page 198 Changed Section 13.8.1: General characteristics on page 199 and Section 13.8.2: Output driving current on page 200 Changed Section 13.9.1: Asynchronous RESET pin on page 205 (changed values, removed references to 3 V and added note 5) Changed Section 13.11: 10-bit ADC characteristics on page 210: changed values in ADC accuracy tables and added note 3 Changed notes in Section 14.3: Thermal characteristics on page 214 Changed Section 15: Device configuration and ordering information on page 215 Changed Table 130: Soldering compatibility (wave and reflow soldering process) on page 208 Added note to OSC option bit in Section 15.2: Option bytes on page 215 Changed configuration of bit 7, option byte 1, in Table 130: Flash and ROM option bytes on page 215 Changed device type/memory size/package and PLL options in ST7L1 FASTROM and ROM microcontroller option list on page 257. Doc ID 11928 Rev 8 229/234 Revision history ST7L34 ST7L35 ST7L38 ST7L39 Table 136. Revision history (continued) Date 17-Mar-2006 20-Dec-2006 230/234 Revision Changes 4 Changed caution text in Section 8.2: External interrupts on page 51 Changed external interrupt function in Section 10.2.1: Input modes on page 68 Changed Table 101 and Table 102 Changed Table 103 and Table 104 Changed Figure 98: RESET pin protection when LVD Is enabled on page 206 Removed EMC protective circuitry in Figure 97: RESET pin protection when LVD is disabled on page 206 (device works correctly without these components) Removed section `LINSCI wrong break duration' from Section 16: Important notes on page 226 5 Replaced `ST7L3' with `ST7L34, ST7L35, ST7L38, ST7L39' in document name and added QFN20 package to package outline on cover page. Changed Section 1: Description on page 14 Transferred device summary table from cover page to Section 1: Description on page 14 Added QFN20 package to the device summary table in Section 1: Description on page 14 Figure 1: General block diagram on page 15: Replaced autoreload timer 2 with autoreload timer 3 Added Figure 3: 20-pin QFN package pinout on page 16 to Section 2 Table 2: Device pin description on page 17: - Added QFN20 package pin numbers - Removed caution about PB0 and PB1 negative current injection restriction Figure 4: Memory map on page 19: Removed references to note 2 Table 3: Hardware register map on page 20: - Changed register name for LTCNTR - Changed reset status of registers LTCSR1, ATCSR and SICSR - Changed note 3 Changed last paragraph of Section 5.5: Access error handling on page 30 Added caution about avoiding unwanted behavior during reset sequence in Section 7.5.1: Introduction on page 42 Figure 17: Reset sequences on page 45: Replaced `TCPU' with `tCPU' at bottom of figure Changed notes in Section 7.6.1: Low voltage detector (LVD) on page 45 Figure 19: Reset and supply management block diagram on page 47: Removed names from SICSR bits 7:5 Changed reset value of bits CR0 and CR1 from 0 to 1 in Section 7.6.4: Register description on page 48 Table 16: Interrupt sensitivity bits on page 54: Restored table number (inadvertantly removed in Rev. 3) Figure 34: Watchdog block diagram on page 75: Changed register label Changed register name and label in Section 11.1.6: Register description on page 77 Added note for ROM devices only to PWM mode on page 79 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Revision history Table 136. Revision history (continued) Date 20-Dec-2006 Revision Changes 5 cont'd Replaced bit name OVIE1 with OVFIE1 in Table 35: AT3 interrupt control/wake-up capability on page 89 Changed description of bits 11:0 in Counter register 1 high (CNTR1H) on page 90, Counter register 1 low (CNTR1L) on page 90 and Table 37: CNTR1H and CNTR1L register descriptions on page 91 Changed name of register ATR1H and ATR1L in Autoreload register high (ATR1H), Autoreload register low (ATR1L) and Table 38: ATR1H and ATR1L register descriptions on page 92 Changed name of register ATCSR2 in Timer control register2 (ATCSR2) and Table 44: ATCSR2 register description on page 97 Changed name of register ATR2H and ATR2L in Autoreload register2 high (ATR2H), Autoreload register2 low (ATR2L) and Table 45: ATR2H and ATR2L register descriptions on page 98 Changed name of register LTCSR1 in Lite timer control/status register (LTCSR1) and Table 53: LTCSR1 register description on page 106. Changed names of registers SPIDR, SPICR and SPICSR in Section 11.4.8: Register description on page 118 Figure 64: LIN synch field measurement on page 148: - replaced `tCPU' with `TCPU' - replaced `tBR' with `TBR' Modified Table 98: Current characteristics on page 180: - Changed IIO values - Removed `Injected current on PB0 and PB1 pins' from table - Removed note 5 `no negative current injection allowed on PB0 and PB1 pins' Restored symbol for PLL jitter in Table 102: Operating conditions (tested for TA = -40 to +125 C) @ VDD = 4.5 to 5.5 V on page 183 (inadvertantly changed in Rev. 4) Added note 5 to Table 105: Operating conditions with low voltage detector on page 186 Specified applicable TA in Table 113: RAM and hardware registers on page 195, Table 114: Characteristics of dual voltage HDFlash memory on page 195 and Table 115: Characteristics of EEPROM data memory on page 196 Changed TA for programming time for 1~32 bytes and changed TPROG from 125C to 85C for write erase cycles in Table 114: Characteristics of dual voltage HDFlash memory on page 195 Figure 84: Two typical applications with unused I/O pin on page 199: Replaced ST7XXX with ST7 Table 121: Output driving current on page 200: Added table number and title Table 122: Asynchronous RESET pin on page 205: Added table number and title Replaced ST72XXX with ST7 in Figure 98: RESET pin protection when LVD Is enabled on page 206 and Figure 97: RESET pin protection when LVD is disabled on page 206 Changed Section 13.10.1: Serial peripheral interface (SPI) on page 207 Figure 100: SPI slave timing diagram with CPHA = 1 on page 208: Replaced CPHA = 0 with CPHA = 1 Figure 101: SPI master timing diagram on page 209: Repositioned tv(MO) and th(MO) Doc ID 11928 Rev 8 231/234 Revision history ST7L34 ST7L35 ST7L38 ST7L39 Table 136. Revision history (continued) Date 20-Dec-2006 02-Aug-2010 232/234 Revision Changes 5 cont'd Table 124: 10-bit ADC characteristics on page 210: Added table number and title Changed PDmax value for SO20 package in Table 129: Thermal characteristics on page 214 Removed text concerning LQFP, TQFP and SDIP packages from Section 15: Device configuration and ordering information on page 215. Figure 102: Typical application with ADC on page 210: Replaced ST72XXX with ST7 Changed typical and maximum values and added table number and title to Table 125: ADC accuracy with 4.5 V < VDD < 5.5 V on page 210 and to Table 126: ADC accuracy with 3 V < VDD < 3.6 V on page 211 Added Figure 105: QFN 5x6, 20-terminal very thin fine pitch quad flat no-lead package on page 213 Added QFN20 package to Table 129: Thermal characteristics on page 214 Table 130: Soldering compatibility (wave and reflow soldering process) on page 208: - Changed title of `Plating material' column - Added QFN package - Removed note concerning Pb-package temperature for leadfree soldering compatibility Changed Section 15.2: Option bytes on page 215 to add different configurations between Flash and ROM devices for OPTION BYTE 0 Removed `automotive' from title of Section 15.3: Device ordering information and transfer of customer code on page 219 Removed `Supported part numbers' table from Section 15.3: Device ordering information and transfer of customer code on page 219 Added Figure 107: ST7FL3x Flash commercial product structure on page 220 Added Table 135: Flash user programmable device types on page 213 Added Figure 108: ST7FL3x FASTROM commercial product structure on page 221 Added Table 136: FASTROM factory coded device types on page 215 Added Figure 109: ROM commercial product code structure on page 222 Added Table 137: ROM factory coded device types on page 216 Updated ST7L3 FASTROM and ROM microcontroller option list on page 223 Changed Section 15.4: Development tools on page 224 and Table 135: ST7L3 development and programming tools on page 225 Updated disclaimer (last page) to include a mention about the use of STproducts in automotive applications 6 Changed the description of internal RC oscillator from `high precision' to `1% in Clock, reset and supply management on cover page and in Section 7.4.3: Internal RC oscillator on page 41 Table 7: RCCR calibration registers on page 37: Added footnote 2 Section 7.6.1: Low voltage detector (LVD) on page 45: Changed the sentence about the LVD to read that it can be enabled with `highest voltage threshold' instead of `low, medium or high' Figure 26: Halt mode flowchart on page 60: Added footnote 5 Doc ID 11928 Rev 8 ST7L34 ST7L35 ST7L38 ST7L39 Revision history Table 136. Revision history (continued) Date Revision Changes 02-Aug-2010 6 cont'd Figure 31: AWUFH mode flowchart on page 65: Added footnote 5 Table 101: Operating conditions (tested for TA = -40 to +125 C) @ VDD = 4.5 to 5.5 V on page 183: Changed fRC and ACCRC Flash values Table 102: Operating conditions (tested for TA = -40 to +125 C) @ VDD = 4.5 to 5.5 V on page 183: Changed ACCPLL `typical' value Table 103: Operating conditions (tested for TA = -40 to +125 C) @ VDD = 3.0 to 3.6 V on page 184: Changed fRC and ACCRC Flash values Table 118: ESD absolute maximum ratings on page 198: Changed values of VESD(HBM) and VESD(HBM). Table 132: Option byte 1 description on page 217: Added `must be set to 1' to option bit 7 and `must be set to 0' to option bit 5 Table 133: Option byte 0 description on page 217: Added `must be set to 1' to option bits 3:2 Updated Figure 107: ST7FL3x Flash commercial product structure, Figure 108: ST7FL3x FASTROM commercial product structure and Figure 109: ROM commercial product code structure 11-Oct-2010 7 Updated fCLKIN test conditions and maximum values in Table 100: General operating conditions and Figure 72: fCLKIN maximum operating frequency vs VDD supply voltage 8 Updated the maximum value of external clock frequency on CLKIN pin (fCLKIN) when VDD = 3 to 3.3 V in Table 100: General operating conditions on page 182 and in Figure 72: fCLKIN maximum operating frequency vs VDD supply voltage on page 182. 18-Nov-2011 Doc ID 11928 Rev 8 233/234 ST7L34 ST7L35 ST7L38 ST7L39 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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