ST STM32F31xx

Real-time clock (RTC)
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DocID023800 Rev 1
19.2.20.8 RTC_RefClockCmd
Function Name
ErrorStatus RTC_RefClockCmd ( FunctionalState NewState)
Function Description
Enables or disables the RTC reference clock detection.
Parameters
 NewState : new state of the RTC reference clock. This
parameter can be: ENABLE or DISABLE.
Return values
 An ErrorStatus enumeration value:
 SUCCESS: RTC reference clock detection is enabled
 ERROR: RTC reference clock detection is disabled
Notes
 None.
19.2.20.9 RTC_BypassShadowCmd
Function Name
void RTC_BypassShadowCmd ( FunctionalState NewState)
Function Description
Enables or Disables the Bypass Shadow feature.
Parameters
 NewState : new state of the Bypass Shadow feature. This
parameter can be: ENABLE or DISABLE.
Return values
 None.
Notes
 When the Bypass Shadow is enabled the calendar value are
taken directly from the Calendar counter.
19.2.21 Backup Data Registers configuration functions
19.2.21.1 RTC_WriteBackupRegister
Function Name
void RTC_WriteBackupRegister ( uint32_t RTC_BKP_DR,
uint32_t Data)
Function Description
Writes a data in a specified RTC Backup data register.
Parameters
 RTC_BKP_DR : RTC Backup data Register number. This
parameter can be: RTC_BKP_DRx where x can be from 0 to
19 to specify the register.