ST STM32L4x6 User Manual

Power control (PWR) RM0351
150/1693 DocID024597 Rev 3
or a RTC event occurs (see Figure 351: RTC block diagrams).
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 Section : Entering low power mode, when the
SLEEPDEEP bit in the Cortex
®
-M4 System Control register is clear.
Refer to Table 22: Sleep for details on how to enter the Sleep mode.
Exiting the Sleep mode
The Sleep mode is exit according Section : Exiting low power mode.
Refer to Table 22: Sleep for more details on how to exit the Sleep mode.
5.3.5 Low-power sleep mode (LP sleep)
Please refer to the product datasheet for more details on voltage regulator and peripherals
operating conditions.
Table 22. Sleep
Sleep-now mode Description
Mode entry
WFI (Wait for Interrupt) or WFE (Wait for Event) while:
– SLEEPDEEP = 0
– No interrupt (for WFI) or event (for WFE) is pending
Refer to the Cortex
®
-M4 System Control register.
On return from ISR while:
– SLEEPDEEP = 0 and
– SLEEPONEXIT = 1
– No interrupt is pending
Refer to the Cortex
®
-M4 System Control register.
Mode exit
If WFI or return from ISR was used for entry
Interrupt: refer to Table 42: STM32L4x6 vector table
If WFE was used for entry and SEVONPEND = 0:
Wakeup event: refer to Section 12.3.2: Wakeup event management
If WFE was used for entry and SEVONPEND = 1:
Interrupt even when disabled in NVIC: refer to Table 42: STM32L4x6
vector table or Wakeup event: refer to Section 12.3.2: Wakeup event
management
Wakeup latency None

ST STM32L4x6 Specifications

General

Brand	ST
Model	STM32L4x6
Category	Microcontrollers
Language	English