ST STM32F31xx

Real-time clock (RTC)
UM1581
366/584
DocID023800 Rev 1
Function Name
void RTC_StructInit ( RTC_InitTypeDef * RTC_InitStruct)
Function Description
Fills each RTC_InitStruct member with its default value.
Parameters
 RTC_InitStruct : pointer to a RTC_InitTypeDef structure
which will be initialized.
Return values
 None.
Notes
 None.
19.2.20.4 RTC_WriteProtectionCmd
Function Name
void RTC_WriteProtectionCmd ( FunctionalState NewState)
Function Description
Enables or disables the RTC registers write protection.
Parameters
 NewState : new state of the write protection. This parameter
can be: ENABLE or DISABLE.
Return values
 None.
Notes
 All the RTC registers are write protected except for
RTC_ISR[13:8], RTC_TAFCR and RTC_BKPxR.
 Writing a wrong key reactivates the write protection.
 The protection mechanism is not affected by system reset.
19.2.20.5 RTC_EnterInitMode
Function Name
ErrorStatus RTC_EnterInitMode ( void )
Function Description
Enters the RTC Initialization mode.
Parameters
 None.
Return values
 An ErrorStatus enumeration value:
 SUCCESS: RTC is in Init mode
 ERROR: RTC is not in Init mode
Notes
 The RTC Initialization mode is write protected, use the
RTC_WriteProtectionCmd(DISABLE) before calling this
function.