ST STM32F412 User Manual

RM0402 Rev 6 95/1163
RM0402 Power controller (PWR)
108
5.3.3 Sleep mode
Entering Sleep mode
The Sleep mode is entered according to Entering low-power mode, when the SLEEPDEEP
bit in the Cortex
®
-M4 with FPU System Control register is cleared.
Refer to Table 16 and Table 17 for details on how to enter Sleep mode.
Note: All interrupt pending bits must be cleared before the sleep mode entry.
Exiting Sleep mode
The Sleep mode is exited according to Exiting low-power mode.
Refer to Table 16 and Table 17 for more details on how to exit Sleep mode.
Table 16. Sleep-now entry and exit
Sleep-now mode Description
Mode entry
WFI (Wait for Interrupt) or WFE (Wait for Event) while:
– SLEEPDEEP = 0, and
– No interrupt (for WFI) or event (for WFE) is pending.
Refer to the Cortex
®
-M4 with FPU System Control register.
On Return from ISR while:
– SLEEPDEEP = 0 and
– SLEEPONEXIT = 1,
– No interrupt is pending.
Refer to the Cortex
®
-M4 with FPU System Control register.
Mode exit
If WFI or Return from ISR was used for entry:
Interrupt: Refer to Table 40: Vector table for STM32F412xx
If WFE was used for entry and SEVONPEND = 0
Wakeup event: Refer to Section 10.2.3: Wakeup event management
f WFE was used for entry and SEVONPEND = 1
Interrupt even when disabled in NVIC: refer to Table 40: Vector table for
STM32F412xx or Wakeup event (see Section 10.2.3: Wakeup event
management).
Wakeup latency None
Table 17. Sleep-on-exit entry and exit
Sleep-on-exit Description
Mode entry
WFI (Wait for Interrupt) or WFE (Wait for Event) while:
– SLEEPDEEP = 0, and
– No interrupt (for WFI) or event (for WFE) is pending.
Refer to the Cortex
®
-M4 with FPU System Control register.
On Return from ISR while:
– SLEEPDEEP = 0, and
– SLEEPONEXIT = 1, and
– No interrupt is pending.
Refer to the Cortex
®
-M4 with FPU System Control register.

ST STM32F412 Specifications

General

Brand	ST
Model	STM32F412
Category	Microcontrollers
Language	English