RTC_SR

RTC Status Register

  0x18 32 Read-only 0x00000000  
Parent topic: Register Summary

RTC Status Register

Bit  31 30 29 28 27 26 25 24  
                   
Access                   
Reset                   
Bit  23 22 21 20 19 18 17 16  
                   
Access                   
Reset                   
Bit  15 14 13 12 11 10 9 8  
                   
Access                   
Reset                   
Bit  7 6 5 4 3 2 1 0  
      TDERR CALEV TIMEV SEC ALARM ACKUPD  
Access      R R R R R R  
Reset      0 0 0 0 0 0  

Bit 0 – ACKUPD: Acknowledge for Update

Acknowledge for Update

ValueNameDescription
0 FREERUN

Time and calendar registers cannot be updated.
1 UPDATE

Time and calendar registers can be updated.

Bit 1 – ALARM: Alarm Flag

Alarm Flag

ValueNameDescription
0 NO_ALARMEVENT

No alarm matching condition occurred.
1 ALARMEVENT

An alarm matching condition has occurred.

Bit 2 – SEC: Second Event

Second Event

ValueNameDescription
0 NO_SECEVENT

No second event has occurred since the last clear.
1 SECEVENT

At least one second event has occurred since the last clear.

Bit 3 – TIMEV: Time Event

Time Event

The time event is selected in the TIMEVSEL field in the Control Register (RTC_CR) and can be any one of the following events: minute change, hour change, noon, midnight (day change).
ValueNameDescription
0 NO_TIMEVENT

No time event has occurred since the last clear.
1 TIMEVENT

At least one time event has occurred since the last clear.

Bit 4 – CALEV: Calendar Event

Calendar Event

The calendar event is selected in the CALEVSEL field in the Control Register (RTC_CR) and can be any one of the following events: week change, month change and year change.
ValueNameDescription
0 NO_CALEVENT

No calendar event has occurred since the last clear.
1 CALEVENT

At least one calendar event has occurred since the last clear.

Bit 5 – TDERR: Time and/or Date Free Running Error

Time and/or Date Free Running Error

ValueNameDescription
0 CORRECT

The internal free running counters are carrying valid values since the last read of the Status Register (RTC_SR).
1 ERR_TIMEDATE

The internal free running counters have been corrupted (invalid date or time, non-BCD values) since the last read and/or they are still invalid.