Stop Mode; Table 16. Sleep-Now Entry And Exit - ST STM32F446 Series Reference Manual

RM0390
Exiting Sleep mode
The Sleep mode is exited according to
Refer to
Sleep-now mode
Mode entry
Mode exit
Wakeup latency
5.3.5

Stop mode

The Stop mode is based on the Cortex
peripheral clock gating. The voltage regulator can be configured either in normal or low-
power mode. In Stop mode, all clocks in the 1.2 V domain are stopped, the PLLs, the HSI
and the HSE RC oscillators are disabled. Internal SRAM and register contents are
preserved.
In Stop mode, the power consumption can be further reduced by using additional settings in
the PWR_CR register. However this will induce an additional startup delay when waking up
from Stop mode (see
Table 16 for details on how to exit the Sleep mode.

Table 16. Sleep-now entry and exit

WFI (Wait for Interrupt) or WFE (Wait for Event) while:
– SLEEPDEEP = 0
Refer to the Cortex
On Return from ISR while:
– SLEEPDEEP = 0 and
– SLEEPONEXIT = 1
Refer to the Cortex
If WFI or Return from ISR was used for entry:
– Interrupt: refer to
If WFE was used for entry and SEVONPEND = 0
– Wakeup event: refer to
If WFE was used for entry and SEVONPEND = 1
– Interrupt event when disabled in NVIC: refer to
STM32F446xx
– Wakeup event: refer to
None
Table 17).
Exiting low power
Description
®
-M4 with FPU System Control register.
®
-M4 with FPU System Control register.
Table 38: Vector table for STM32F446xx
Section 10.2.3: Wakeup event management
Section 10.2.3: Wakeup event
®
-M4 with FPU deepsleep mode combined with
RM0390 Rev 4
Power controller (PWR)
mode.
Table 38: Vector table for
management.
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