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AN3147 Fiches technique(PDF) 13 Page - STMicroelectronics

No de pièce AN3147
Description  Power management in STM8L and STM8AL
PDF  25 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3147 Fiches technique(HTML) 13 Page - STMicroelectronics

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13/25
AN3147
Run and low power modes
24
4.2.1
STM8L101xx low power modes
The STM8L101xx devices feature the following main low power modes:
Wait mode: CPU stopped and peripherals kept running
Active-halt mode: CPU stopped, AWU (auto-wakeup) and IWDG (independent
watchdog) kept running if enabled.
Halt mode: CPU and peripheral clocks stopped
4.2.2
STM8L05xxx, STM8L15xxx, STM8L162xx, STM8AL31xx and
STM8AL3Lxx low power modes
STM8L05xxx, STM8L15xxx, STM8L162xx, STM8AL31xx and STM8AL3Lxx devices feature
the following main low power modes:
Wait mode: CPU clock stopped, peripherals kept running
Low power run mode: executing code is done from RAM with a low speed oscillator
(LSI or LSE); selected peripherals remain active
Low power wait mode: CPU clock stopped; selected peripherals remain active
Active-halt mode: CPU clock stopped, AWU/RTC (auto wakeup/real-time clock) and
IWDG (independent watchdog) kept running if enabled
Halt mode: everything is stopped.
Table 3. Low power mode summary
Low power
modes
Entry
Functions
Low power modes names
and consumptions
CPU Peripherals
High
speed
osc.
RTC
calendar
LSI
LSE
Flash RAM
STM8L &
STM8AL
typical
values
@ 3V/25°C
STM8L &
STM8AL
typical
values
@ 3V/85°C
Low power
run
Software
sequence
ON
Can be
enabled
OFF
ON
ON
OFF
ON
5.4 µA
6.8 µA
Low power
wait
Software
sequence
+ WFE
OFF
Can be
enabled
OFF
ON
ON
OFF
ON
3.3 µA
4.4 µA
Active-halt
w/ full RTC
HALT
OFF
ON
ON
OFF
ON
1.0 µA(1)
1.4 µA
Active-halt
w/ RTC
on LSI
OFF
ON
OFF
ON
0.8 µA(1)
1.2 µA
Halt
OFF
OFF OFF
ON
0.4 µA(1)
1 µ A
1. Internal reference voltage and BOR off.



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