ST7LUS5 datasheet(44/124 Pages) STMICROELECTRONICS

Part #	ST7LUS5

Description	8-bit low cost, low pin-count MCU for automotive,with single voltage Flash memory, ADC, timers

PDF	124 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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44 / 124 page

Power saving modes

ST7LUS5, ST7LU05, ST7LU09

44/124

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

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

ST7LUS5 Datasheet(PDF) 44 Page - STMicroelectronics

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