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Hodnocené. / 5. Na základě hodnocení zákazníků
ST72321xx-Auto Power saving modes
Doc ID 13829 Rev 1 65/243
8.4 Active Halt and Halt modes
Active Halt and Halt modes are the two lowest power consumption modes of the MCU. They
are both entered by executing the ‘HALT’ instruction. The decision to enter either in Active
Halt or Halt mode is given by the MCC/RTC interrupt enable flag (OIE bit in MCCSR
register) as shown in Ta bl e 2 7 .
8.4.1 Active Halt mode
Active Halt mode is the lowest power consumption mode of the MCU with a real-time clock
available. It is entered by executing the ‘HALT’ instruction when the OIE bit of the Main Clock
Controller Status register (MCCSR) is set (see Section 12.3: ART registers on page 93 for
more details on the MCCSR register).
The MCU can exit Active Halt mode on reception of an MCC/RTC interrupt or a RESET.
When exiting Active Halt mode by means of an interrupt, no 256 or 4096 CPU cycle delay
occurs. The CPU resumes operation by servicing the interrupt or by fetching the reset vector
which woke it up (see Figure 26).
When entering Active Halt mode, the I[1:0] bits in the CC register are forced to ‘10b’ to
enable interrupts. Therefore, if an interrupt is pending, the MCU wakes up immediately.
In Active Halt mode, only the main oscillator and its associated counter (MCC/RTC) are
running to keep a wake-up time base. All other peripherals are not clocked except those
which get their clock supply from another clock generator (such as external or auxiliary
oscillator).
The safeguard against staying locked in Active Halt mode is provided by the oscillator
interrupt.
Note: As soon as the interrupt capability of one of the oscillators is selected (MCCSR.OIE bit set),
entering Active Halt mode while the Watchdog is active does not generate a RESET.
This means that the device cannot spend more than a defined delay in this power saving
mode.
Caution: When exiting Active Halt mode following an MCC/RTC interrupt, OIE bit of MCCSR register
must not be cleared before t
DELAY
after the interrupt occurs (t
DELAY
= 256 or 4096 t
CPU
delay depending on option byte). Otherwise, the ST7 enters Halt mode for the remaining
t
DELAY
period.
Table 27. MCC/RTC low power mode selection
MCCSR OIE bit Power saving mode entered when HALT instruction is executed
0Halt
1 Active Halt
- ST72321xx-Auto 1
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 12.2.8 Input capture function 91
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- 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
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- 13.3.4 Output compare 105
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- 13.3.6 One Pulse mode 108
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- 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
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- 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
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- 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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- 19.9.1 Asynchronous RESET pin 207
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- 19.9.2 ICCSEL/V 209
- ICCSEL/V 210
- PROGRAMMING 210
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- 19.11.2 214
- ±5% tolerance 215
- ±2% tolerance 215
- INJ(PIN) 216
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- 19.12.3 ADC accuracy 219
- 20 Package characteristics 220
- 21.1.1 Flash configuration 223
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- 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
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- 23 Revision history 242
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