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ST72344K2 Datasheet(PDF) 64 Page - STMicroelectronics

Part # ST72344K2
Description  SCI asynchronous serial interface
PDF  247 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72344K2 Datasheet(HTML) 64 Page - STMicroelectronics

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Power-saving modes
ST72344xx, ST2345xx
64/247
Doc ID 12321 Rev 6
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 25):
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 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 25.
Power saving mode transitions
Power consumption
Wait
Slow
Run
Active-halt
High
Low
Slow-wait
Auto-wakeup from Halt
Halt



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