ST72344S2 datasheet(64/247 Pages) STMICROELECTRONICS

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Power-saving modes

ST72344xx, ST2345xx

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Doc ID 12321 Rev 6

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

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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