RTC status register
| ALRAF | Alarm A flag This flag is set by hardware when the time/date registers (RTC_TR and RTC_DR) match the alarm A register (RTC_ALRMAR). |
| TSF | Timestamp flag This flag is set by hardware when a timestamp event occurs. |
| TSOVF | Timestamp overflow flag This flag is set by hardware when a timestamp event occurs while TSF is already set. It is recommended to check and then clear TSOVF only after clearing the TSF bit. Otherwise, an overflow might not be noticed if a timestamp event occurs immediately before the TSF bit is cleared. |