ST7LITE20F2 datasheet(52/166 Pages) STMICROELECTRONICS

Part #	ST7LITE20F2

Description	8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, Timers, SPI

PDF	166 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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52 / 166 page

Power saving modes

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

52/166

Doc ID 8349 Rev 5

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 21):

●

Slow

●

Wait (and Slow-Wait)

●

Active Halt

●

Auto Wake up From Halt (AWUF)

●

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 21. Power saving mode transitions

9.2

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.

POWER CONSUMPTION

WAIT

SLOW

RUN

ACTIVE-HALT

HIGH

LOW

SLOW-WAIT

AUTO-WAKEUP FROM HALT

HALT

ST7LITE20F2 Datasheet(PDF) 52 Page - STMicroelectronics

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