XC888LM datasheet(86/144 Pages) INFINEON

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XC886/888CLM

Functional Description

Data Sheet

V0.9, 2006-12

3.9

Power Saving Modes

The power saving modes of the XC886/888 provide flexible power consumption through

a combination of techniques, including:

•

Stopping the CPU clock

•

Stopping the clocks of individual system components

•

Reducing clock speed of some peripheral components

•

Power-down of the entire system with fast restart capability

After a reset, the active mode (normal operating mode) is selected by default (see

Figure 27) and the system runs in the main system clock frequency. From active mode,

different power saving modes can be selected by software. They are:

•

Idle mode

•

Slow-down mode

•

Power-down mode

Figure 27

Transition between Power Saving Modes

POWER-DOWN

IDLE

ACTIVE

SLOW-DOWN

set PD

bit

set PD

bit

set IDLE

bit

set IDLE

bit

set SD

bit

clear SD

bit

any interrupt

& SD=0

EXINT0/RXD pin

& SD=0

EXINT0/RXD pin

& SD=1

any interrupt

& SD=1

XC888LM Datasheet(PDF) 86 Page - Infineon Technologies AG

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