Low Power Mode Configuration Functions - ST STM32F31xx User Manual

Power control (PWR)
17.2.9

Low power mode configuration functions

17.2.9.1 PWR_EnterSleepMode
Function Name
Function Description
Parameters
Return values
Notes
17.2.9.2 PWR_EnterSTOPMode
Function Name
Function Description
Parameters
Return values
Notes
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void PWR_EnterSleepMode ( uint8_t PWR_SLEEPEntry)
Enters Sleep mode.

PWR_SLEEPEntry : specifies if SLEEP mode in entered
with WFI or WFE instruction. This parameter can be one of
the following values:

PWR_SLEEPEntry_WFI :
instruction

PWR_SLEEPEntry_WFE :
WFE instruction

None.

In Sleep mode, all I/O pins keep the same state as in Run
mode.
void PWR_EnterSTOPMode ( uint32_t PWR_Regulator, uint8_t
PWR_STOPEntry)
Enters STOP mode.

PWR_Regulator : specifies the regulator state in STOP
mode. This parameter can be one of the following values:

PWR_Regulator_ON :

PWR_Regulator_LowPower :
regulator in low power mode

PWR_STOPEntry : specifies if STOP mode in entered with
WFI or WFE instruction. This parameter can be one of the
following values:

PWR_STOPEntry_WFI :
instruction

PWR_STOPEntry_WFE :
instruction

None.

In Stop mode, all I/O pins keep the same state as in Run
mode.

When exiting Stop mode by issuing an interrupt or a wakeup
event, the MSI RC oscillator is selected as system clock.

When the voltage regulator operates in low power mode, an
additional startup delay is incurred when waking up from Stop
DocID023800 Rev 1
enter SLEEP mode with WFI
enter SLEEP mode with
STOP mode with regulator ON
STOP mode with
enter STOP mode with WFI
enter STOP mode with WFE
UM1581