Power control (PWR) RM0440
240/2126 RM0440 Rev 4
Table 40. Low-power mode summary
Mode name Entry
Wakeup
source
(1)
Wakeup
system clock
Effect on clocks
Voltage
regulators
MR LPR
Sleep
(Sleep-now or
Sleep-on-exit)
WFI or Return
from ISR
Any interrupt
Same as before
entering Sleep
mode
CPU clock OFF
no effect on other clocks
or analog clock sources
ON
ON
WFE Wakeup event
Low-power
run
Set LPR bit Clear LPR bit
Same as Low-
power run clock
None
OFF
Low-power
sleep
Set LPR bit +
WFI or Return
from ISR
Any interrupt
Same as before
entering Low-
power sleep
mode
CPU clock OFF
no effect on other clocks
or analog clock sources
Set LPR bit +
WFE
Wakeup event
Stop 0
LPMS=”000” +
SLEEPDEEP bit
+ WFI or Return
from ISR or WFE
Any EXTI line
(configured in the
EXTI registers)
Specific
peripherals
events
HSI16
All clocks OFF except
LSI and LSE
ON
Stop 1
LPMS=”001” +
SLEEPDEEP bit
+ WFI or Return
from ISR or WFE
OFF
Standby with
SRAM2
LPMS=”011”+
Set RRS bit +
SLEEPDEEP bit
+ WFI or Return
from ISR or WFE
WKUP pin edge,
RTC event, TAMP
event, external
reset on NRST
pin, IWDG reset
Standby
LPMS=”011” +
Clear RRS bit +
SLEEPDEEP bit
+ WFI or Return
from ISR or WFE
OFF
Shutdown
LPMS=”1--” +
SLEEPDEEP bit
+ WFI or Return
from ISR or WFE
WKUP pin edge,
RTC event, TAMP
event, external
reset on NRST
pin
All clocks OFF except
LSE
1. Refer to Table 41: Functionalities depending on the working mode.
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