ST STM32F31xx User Manual page 319

UM1581
Return values
Notes
18.2.6.7 RCC_LSEDriveConfig
Function Name
Function Description
Parameters
Return values
Notes
18.2.6.8 RCC_LSICmd
Function Name
Function Description
Parameters
Return values

None.

As the LSE is in the Backup domain and write access is
denied to this domain after reset, you have to enable write
access using PWR_BackupAccessCmd(ENABLE) function
before to configure the LSE (to be done once after reset).

After enabling the LSE (RCC_LSE_ON or
RCC_LSE_Bypass), the application software should wait on
LSERDY flag to be set indicating that LSE clock is stable and
can be used to clock the RTC.
void RCC_LSEDriveConfig ( uint32_t RCC_LSEDrive)
Configures the External Low Speed oscillator (LSE) drive
capability.

RCC_LSEDrive : specifies the new state of the LSE drive
capability. This parameter can be one of the following values:

RCC_LSEDrive_Low :
capability.

RCC_LSEDrive_MediumLow :
low drive capability.

RCC_LSEDrive_MediumHigh :
high drive capability.

RCC_LSEDrive_High :
capability.

None.

None.
void RCC_LSICmd (
Enables or disables the Internal Low Speed oscillator (LSI).

NewState : new state of the LSI. This parameter can be:
ENABLE or DISABLE.

None.
DocID023800 Rev 1
Reset and clock control (RCC)
LSE oscillator low drive
LSE oscillator medium
LSE oscillator high drive
FunctionalState NewState)
LSE oscillator medium
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