Table 37. Functionalities Depending On System Operating Mode - STMicroelectronics STM32WLEx Reference Manual

RM0461
Mode name Entry
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 37: Functionalities depending on system operating

Table 37. Functionalities depending on system operating mode

Peripheral
CPU
Radio-system (sub-GHz)
Table 36. Low-power mode summary (continued)
Wakeup
(1)
source
Any EXTI line
(configured in the
EXTI registers).
Specific
peripherals
events
Wakeup PVD,
RFIRQ, wakeup
RFBUSY, WKUP
pin edge, RTC
and TAMP event,
LSECSS,
external reset in
NRST pin,
IWDG reset
WKUP pin edge,
RTC and TAMP
event, external
reset in NRST
pin
Y - Y -
O O O O
RM0461 Rev 5
Wakeup
system clock
HSI16 when
STOPWUCK = 1 in
RCC_CFGR.
All clocks OFF
MSI with the
except HSI16, LSI and
frequency before
LSE
entering the Stop
mode when
STOPWUCK = 0.
MSI 4 MHz
All clocks OFF
MSI 4 MHz
except LSE
mode.
Stop 0 Stop 1
- -
R - R -
O O O O
Power control (PWR)
Effect on clocks
All clocks OFF
except LSI and LSE
(1)
Stop 2 Standby Shutdo
- -
R - - -
O O O O
Voltage
regulators
MR LPR
ON
ON
OFF
OFF OFF
OFF OFF
-
- - -
- - -
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