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ST7LITEU09 데이터시트(PDF) 44 Page - STMicroelectronics

부품명 ST7LITEU09
상세설명  8-bit MCU with single voltage Flash memory, ADC, timers
PDF  115 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LITEU09 데이터시트(HTML) 44 Page - 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
register is forced to 0 to enable interrupts. There-
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
1



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