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Power saving modes ST72321xx-Auto
68/243 Doc ID 13829 Rev 1
Figure 28. Halt mode flowchart
1. WDGHALT is an option bit. See Section 21.1.1: Flash configuration on page 223 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 20: Interrupt mapping 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.
HALT INSTRUCTION
RESET
INTERRUPT
(3)
Y
N
N
Y
CPU
OSCILLATOR
PERIPHERALS
(2)
I[1:0] BITS
OFF
OFF
10
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
OFF
XX
(4)
ON
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
ON
XX
(4)
ON
256 OR 4096 CPU CLOCK
DELAY
WATCHDOG
ENABLE
DISABLE
WDGHALT
(1)
0
WATCHDOG
RESET
1
(MCCSR.OIE = 0)
CYCLE
- ST72321xx-Auto 1
- Contents 2
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- Doc ID 13829 Rev 1 17/243 17
- 1 Description 18
- ST72321xx-Auto Description 19
- 2.1 Package pinout 20
- 2.2 Pin description 22
- 4 Flash program memory 29
- 4.4 ICC interface 30
- Doc ID 13829 Rev 1 31/243 31
- 4.7 Related documentation 32
- 5.1 Introduction 33
- 5.2 Main features 33
- 5.3 CPU registers 33
- 5.3.1 Accumulator (A) 34
- 5.3.3 Program counter (PC) 34
- Interrupt management bits 35
- 36/243 Doc ID 13829 Rev 1 36
- 6.1 Introduction 37
- 6.2 Main features 37
- 6.3 Phase locked loop 38
- 6.4 Multi-oscillator (MO) 38
- Crystal/ceramic oscillators 39
- Internal RC oscillator 39
- 6.5.1 Introduction 40
- 6.5.5 Internal watchdog RESET 42
- Doc ID 13829 Rev 1 43/243 43
- Monitoring the V 44
- main supply 44
- 6.6.3 Low power modes 46
- 6.6.4 Interrupts 46
- SICSR description 47
- Application notes 48
- 7 Interrupts 49
- Servicing pending interrupts 50
- Non-maskable sources 51
- Maskable sources 51
- 52/243 Doc ID 13829 Rev 1 52
- HARDWARE PRIORITY 52
- 7.6 External interrupts 57
- Interrupts ST72321xx-Auto 58
- ST72321xx-Auto Interrupts 59
- 8 Power saving modes 62
- 8.3 Wait mode 63
- 8.4.1 Active Halt mode 65
- 8.4.2 Halt mode 67
- Halt mode recommendations 69
- 9 I/O ports 70
- 9.2.2 Output modes 71
- 9.2.3 Alternate functions 71
- 1. The diode to V 72
- ST72321xx-Auto I/O ports 73
- 9.3 I/O port implementation 74
- 9.4 Low power modes 75
- 9.5 Interrupts 75
- 10 Watchdog timer (WDG) 77
- 78/243 Doc ID 13829 Rev 1 78
- 10.5 Low power modes 80
- 10.8 Interrupts 80
- 10.9 Register description 81
- (MCC/RTC) 82
- Low power modes 83
- Interrupts 83
- 12.2 Functional description 88
- Doc ID 13829 Rev 1 89/243 89
- 90/243 Doc ID 13829 Rev 1 90
- 12.2.8 Input capture function 91
- 92/243 Doc ID 13829 Rev 1 92
- 12.3 ART registers 93
- 13 16-bit timer 98
- 13.3 Functional description 99
- 16-bit timer ST72321xx-Auto 100
- 16-bit read sequence 101
- 13.3.2 External clock 102
- 13.3.3 Input capture 103
- 104/243 Doc ID 13829 Rev 1 104
- 13.3.4 Output compare 105
- 106/243 Doc ID 13829 Rev 1 106
- Doc ID 13829 Rev 1 107/243 107
- 13.3.6 One Pulse mode 108
- Doc ID 13829 Rev 1 109/243 109
- Procedure 110
- 13.4 Low power modes 112
- 13.5 Interrupts 112
- 13.6 Summary of timer modes 112
- 13.7 16-bit timer registers 113
- ST72321xx-Auto 16-bit timer 115
- 117
- Related documentation 120
- 14.1 Introduction 121
- 14.2 Main features 121
- 14.3 General description 121
- 14.3.1 Functional description 122
- 14.3.3 Master mode operation 124
- 14.3.5 Slave mode operation 125
- 126/243 Doc ID 13829 Rev 1 126
- Doc ID 13829 Rev 1 127/243 127
- CPHA = 1 127
- CPHA = 0 127
- 14.5 Error flags 128
- 14.5.4 Single master systems 129
- 14.6 Low power modes 130
- 14.7 Interrupts 130
- 14.8 SPI registers 131
- 15.3 General description 136
- Figure 62. SCI block diagram 137
- 15.4 Functional description 138
- 15.4.2 Transmitter 139
- 15.4.3 Receiver 140
- Doc ID 13829 Rev 1 141/243 141
- 142/243 Doc ID 13829 Rev 1 142
- Extended baud rate generation 143
- Parity control 144
- SCI clock tolerance 144
- Clock deviation causes 145
- Noise error causes 145
- 15.5 Low power modes 146
- 15.6 Interrupts 146
- 15.7 SCI registers 147
- 16.3 General description 156
- 16.3.3 SDA/SCL line control 157
- 16.4 Functional description 158
- 16.4.2 Master mode 159
- Slave address transmission 160
- Master receiver 160
- Master transmitter 160
- Error cases 161
- 16.5 Low power modes 163
- 16.6 Interrupts 163
- 16.7 Register description 164
- 16.7.2 I 165
- C status register 1 (SR1) 165
- 16.7.3 I 167
- C status register 2 (SR2) 167
- 16.7.4 I 168
- 16.7.5 I 169
- C data register (DR) 169
- 16.7.6 I 169
- C own address register (OAR1) 169
- 16.7.7 I 170
- C own address register (OAR2) 170
- Table 90. I 171
- 17.1 Introduction 172
- 17.2 Main features 172
- 17.3 Functional description 173
- 17.4 Low power modes 174
- 17.5 Interrupts 174
- 17.6 ADC registers 174
- 17.6.2 Data register (ADCDRH) 175
- 17.6.3 Data register (ADCDRL) 176
- 18 Instruction set 177
- 18.1.1 Inherent 178
- 18.1.2 Immediate 179
- 18.1.3 Direct 179
- 18.1.5 Indirect (short, long) 180
- 18.2 Instruction groups 181
- 18.2.1 Using a prebyte 182
- 19 Electrical characteristics 185
- 19.3 Operating conditions 188
- IT+(LVD) 189
- : Flash devices 192
- Power consumption vs f 192
- 19.5.1 General timings 195
- 19.5.2 External clock source 195
- 19.5.5 PLL characteristics 198
- 19.6 Memory characteristics 199
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- 201
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- 206/243 Doc ID 13829 Rev 1 206
- 19.9.1 Asynchronous RESET pin 207
- 208/243 Doc ID 13829 Rev 1 208
- 19.9.2 ICCSEL/V 209
- ICCSEL/V 210
- PROGRAMMING 210
- Doc ID 13829 Rev 1 213/243 213
- 19.11.2 214
- ±5% tolerance 215
- ±2% tolerance 215
- INJ(PIN) 216
- Doc ID 13829 Rev 1 217/243 217
- 218/243 Doc ID 13829 Rev 1 218
- 19.12.3 ADC accuracy 219
- 20 Package characteristics 220
- 21.1.1 Flash configuration 223
- Doc ID 13829 Rev 1 227/243 227
- 230/243 Doc ID 13829 Rev 1 230
- 21.3 Development tools 231
- 21.4 ST7 application notes 233
- 22 Known limitations 234
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- 22.1.8 16-bit timer PWM mode 239
- 22.2 All Flash devices 240
- Doc ID 13829 Rev 1 241/243 241
- 23 Revision history 242
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