ST7LITEU05 datasheet(44/115 Pages) STMICROELECTRONICS

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POWER SAVING MODES (Cont’d)

Similarities with Halt mode

The following AWUFH mode behaviour is the

same as normal Halt mode:

– The MCU can exit AWUFH mode by means of

any interrupt with exit from Halt capability or a re-

set (see Section 9.4 ACTIVE-HALT AND HALT

MODES).

– When entering AWUFH mode, the I bit in the CC

fore, if an interrupt is pending, the MCU wakes

up immediately.

– In AWUFH mode, the main oscillator is turned off

causing all internal processing to be stopped, in-

cluding the operation of the on-chip peripherals.

None of the peripherals are clocked except those

which get their clock supply from another clock

generator (such as an external or auxiliary oscil-

lator like the AWU oscillator).

– The compatibility of watchdog operation with

AWUFH mode is configured by the WDGHALT

option bit in the option byte. Depending on this

setting, the HALT instruction when executed

while the watchdog system is enabled, can gen-

erate a watchdog RESET.

Figure 30. AWUF Halt Timing Diagram

AWUFH interrupt

fCPU

RUN MODE

HALT MODE

256 or 512 tCPU

RUN MODE

fAWU_RC

Clear

by software

tAWU

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