ST STM32F31xx

Power control (PWR)
UM1581
306/584
DocID023800 Rev 1
17.2.9 Low power mode configuration functions
17.2.9.1 PWR_EnterSleepMode
Function Name
void PWR_EnterSleepMode ( uint8_t PWR_SLEEPEntry)
Function Description
Enters Sleep mode.
Parameters
 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 : enter SLEEP mode with WFI
instruction
 PWR_SLEEPEntry_WFE : enter SLEEP mode with
WFE instruction
Return values
 None.
Notes
 In Sleep mode, all I/O pins keep the same state as in Run
mode.
17.2.9.2 PWR_EnterSTOPMode
Function Name
void PWR_EnterSTOPMode ( uint32_t PWR_Regulator, uint8_t
PWR_STOPEntry)
Function Description
Enters STOP mode.
Parameters
 PWR_Regulator : specifies the regulator state in STOP
mode. This parameter can be one of the following values:
 PWR_Regulator_ON : STOP mode with regulator ON
 PWR_Regulator_LowPower : STOP mode with
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 : enter STOP mode with WFI
instruction
 PWR_STOPEntry_WFE : enter STOP mode with WFE
instruction
Return values
 None.
Notes
 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