RM0440 Rev 4 249/2126
RM0440 Power control (PWR)
271
6.3.7 Stop 1 mode
The Stop 1 mode is the same as Stop 0 mode except that the main regulator is OFF, and
only the low-power regulator is ON. Stop 1 mode can be entered from Run mode and from
Low-power run mode.
Refer to Table 46: Stop 1 mode for details on how to enter and exit Stop 1 mode.
Table 45. Stop 0 mode
Stop 0 mode Description
Mode entry
WFI (Wait for Interrupt) or WFE (Wait for Event) while:
– SLEEPDEEP bit is set in Cortex
®
-M4 with FPU System Control register
– No interrupt (for WFI) or event (for WFE) is pending
– LPMS = “000” in PWR_CR1
On Return from ISR while:
– SLEEPDEEP bit is set in Cortex
®
-M4 with FPU System Control register
– SLEEPONEXIT = 1
– No interrupt is pending
– LPMS = “000” in PWR_CR1
Note: To enter Stop 0 mode, all EXTI Line pending bits (in Pending
register 1 (EXTI_PR1)), and the peripheral flags generating wakeup
interrupts must be cleared. Otherwise, the Stop 0 mode entry
procedure is ignored and program execution continues.
Mode exit
If WFI or Return from ISR was used for entry
Any EXTI Line configured in Interrupt mode (the corresponding EXTI
Interrupt vector must be enabled in the NVIC). The interrupt source can
be external interrupts or peripherals with wakeup capability. Refer to
Table 97: STM32G4 Series vector table.
If WFE was used for entry and SEVONPEND = 0:
Any EXTI Line configured in event mode. Refer to Section 15.3.2:
Wakeup event management.
If WFE was used for entry and SEVONPEND = 1:
Any EXTI Line configured in Interrupt mode (even if the corresponding
EXTI Interrupt vector is disabled in the NVIC). The interrupt source can
be external interrupts or peripherals with wakeup capability. Refer
toTable 97: STM32G4 Series vector table.
Wakeup event: refer to Section 15.3.2: Wakeup event management
Wakeup latency
Longest wakeup time between: HSI16 wakeup time and Flash wakeup time
from Stop 0 mode.
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