Table 44. Low-Power Mode Summary - STMicroelectronics STM32WL5 Series Reference Manual

RM0453
Mode name Entry
WFI or return
Sleep
from ISR
(Sleep-now or
Sleep-on-exit)
WFE
LPRun Set LPR bit
Set LPR bit +
WFI or return
from ISR
LPSleep
Set LPR bit +
WFE
LPMS = 0b000 +
SLEEPDEEP bit
Stop 0
+ WFI or return
from ISR or WFE
LPMS = 0b001 +
SLEEPDEEP bit
Stop 1
+ WFI or return
from ISR or WFE
Stop 2
LPMS = 0b010+
(with I2C3,
SLEEPDEEP bit
LPUART1,
+ WFI or return
LPTIM1,
from ISR or WFE
SRAM1,
SRAM2)
LPMS = 0b011+
Set RRS bit +
Standby (with
SLEEPDEEP bit
SRAM2)
+ WFI or return
from ISR or WFE
LPMS = 0b011 +
Clear RRS bit +
Standby SLEEPDEEP bit
+ WFI or return
from ISR or WFE
LPMS = 0b1xx +
SLEEPDEEP bit
Shutdown
+ WFI or return
from ISR or WFE
1. Refer to Table 45: Functionalities depending on system operating

Table 44. Low-power mode summary

Wake-up
(1)
source system clock
Any interrupt
Same as before
entering Sleep mode
Wake-up event
Same as LPRun
Clear LPR bit
clock
Any interrupt
Same as before
entering LPSleep
mode
Wake-up event
HSI16 when
Any EXTI line STOPWUCK = 1 in
(configured in the RCC_CFGR.
EXTI registers).
MSI with the
Specific frequency before
peripherals entering the Stop
events mode when
STOPWUCK = 0.
Wake-up PVD,
RFIRQ, wake-up
RFBUSY, WKUP
pin edge, RTC
and TAMP event, MSI 4 MHz
LSECSS,
external reset in
NRST pin,
IWDG reset
WKUP pin edge,
RTC and TAMP
event, external MSI 4 MHz
reset in NRST
pin
RM0453 Rev 5
Wake-up
Effect on clocks
CPU clock OFF
No effect on other clocks
or analog clock sources
None
CPU clock OFF
No effect on other clocks
or analog clock sources
All clocks OFF
except HSI16, LSI and
LSE
All clocks OFF
except LSI and LSE
All clocks OFF
except LSE
mode.
Power control (PWR)
Voltage
regulators
MR LPR
ON ON
OFF ON
OFF ON
OFF ON
ON
ON
OFF
OFF OFF
OFF OFF
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