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参数资料
| 型号： | ST7PLU09MCTRE |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO8 |
| 封装： | 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8 |
| 文件页数： | 64/124页 |
| 文件大小： | 1995K |
| 代理商： | ST7PLU09MCTRE |
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Power saving modes
ST7LUS5, ST7LU05, ST7LU09
8
Power saving modes
8.1
Introduction
To give a large measure of flexibility to the application in terms of power consumption, four
main power saving modes are implemented in the ST7 (see Figure 16):
●
Slow
●
Wait (and Slow Wait)
●
Active Halt
●
Auto Wake-up 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 (fOSC).
From RUN mode, the different power saving modes may be selected by setting the relevant
register bits or by calling the specific ST7 software instruction whose action depends on the
oscillator status.
Figure 16.
Power saving mode transitions
8.2
Slow mode
This mode has two targets:
●
To reduce power consumption by decreasing the internal clock in the device
●
To adapt the internal clock frequency (fCPU) to the available supply voltage.
Slow mode is controlled by the SMS bit in the MCCSR register which enables or disables
Slow mode.
POWER CONSUMPTION
WAIT
SLOW
RUN
ACTIVE HALT
High
Low
SLOW WAIT
HALT
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