ST STM32G4 Series Reference Manual page 202

Power control (PWR)
by:
–
–
From Standby modes, and Shutdown modes the MCU exit low power mode through an
external reset (NRST pin), an IWDG reset, a rising edge on one of the enabled WKUPx pins
or a RTC event occurs (see
After waking up from Standby or Shutdown mode, program execution restarts in the same
way as after a Reset (boot pin sampling, option bytes loading, reset vector is fetched, etc.).
5.3.4 Sleep mode
I/O states in Sleep mode
In Sleep mode, all I/O pins keep the same state as in Run mode.
Entering the Sleep mode
The Sleep mode is entered according
SLEEPDEEP bit in the Cortex
Refer to
Exiting the Sleep mode
The Sleep mode is exit according Section : Exiting low power mode.
Refer to
202/2083
NVIC IRQ interrupt.
- When SEVONPEND = 0 in the Cortex
enabling an interrupt in the peripheral control register and in the NVIC. When the
MCU resumes from WFE, the peripheral interrupt pending bit and the NVIC
peripheral IRQ channel pending bit (in the NVIC interrupt clear pending register)
have to be cleared.
Only NVIC interrupts with sufficient priority will wakeup and interrupt the MCU.
- When SEVONPEND = 1 in the Cortex
By enabling an interrupt in the peripheral control register and optionally in the
NVIC. When the MCU resumes from WFE, the peripheral interrupt pending bit and
when enabled the NVIC peripheral IRQ channel pending bit (in the NVIC interrupt
clear pending register) have to be cleared.
All NVIC interrupts will wakeup the MCU, even the disabled ones. Only enabled
NVIC interrupts with sufficient priority will wakeup and interrupt the MCU.
Event
Configuring a EXTI line in event mode. When the CPU resumes from WFE, it is
not necessary to clear the EXTI peripheral interrupt pending bit or the NVIC IRQ
channel pending bit as the pending bits corresponding to the event line is not set.
It may be necessary to clear the interrupt flag in the peripheral.
Figure 421: RTC block
®
Table 33: Sleep for details on how to enter the Sleep mode.
Table 33: Sleep for more details on how to exit the Sleep mode.
®
-M4 with FPU System Control register. By
®
-M4 with FPU System Control register.
diagrams).
Section : Entering low power
-M4 with FPU System Control register is clear.
RM0440 Rev 1
RM0440
mode, when the