ST7FLUS5MCE View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7FLUS5MCE

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

STMicroelectronics 

Prev 41 42 43 44 45 46 47 48 49 50 Next

ST7LUS5, ST7LU05, ST7LU09

8

Power saving modes

Power saving modes

8.1

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 (AWUFH)

● Halt

t(s) 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

c the main oscillator frequency (fOSC).

du From run mode, the different power saving modes may be selected by setting the relevant

ro ) register bits or by calling the specific ST7 software instruction whose action depends on the

P t(s oscillator status.

lete uc Figure 17. Power saving mode transitions

so rod High

b P Run

) - O lete Slow

ct(s bso Wait

rodu ) - O Slow wait

te P ct(s Active halt

sole rodu Halt

b P Low power consumption

OObsolete 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.

45/124

Share Link: