Datasheet

122
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
Figure 15-2. Update Sequence
Prepare TIme or Calendar Fields
Set UPDTIM and/or UPDCAL
bit(s) in RTC_CR
Read RTC_SR
ACKUPD
= 1 ?
Clear ACKUPD bit in RTC_SCCR
Update Time and/or Calendar values in
RTC_TIMR/RTC_CALR
Clear UPDTIM and/or UPDCAL bit in
RTC_CR
No
Ye s
Begin
End
Polling or
IRQ (if enabled)