Atmel SAM4S Series, Preliminary Data Sheet

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11100B–ATARM–31-Jul-12
SAM4S Series [Preliminary]
15.6.1 RTC Control Register
Name: RTC_CR
Address: 0x400E1460
Access: Read-write
• UPDTIM: Update Request Time Register
0 = No effect.
1 = Stops the RTC time counting.
Time counting consists of second, minute and hour counters. Time counters can be programmed once this bit is set and
acknowledged by the bit ACKUPD of the Status Register.
• UPDCAL: Update Request Calendar Register
0 = No effect.
1 = Stops the RTC calendar counting.
Calendar counting consists of day, date, month, year and century counters. Calendar counters can be programmed once
this bit is set.
• TIMEVSEL: Time Event Selection
The event that generates the flag TIMEV in RTC_SR (Status Register) depends on the value of TIMEVSEL.
• CALEVSEL: Calendar Event Selection
The event that generates the flag CALEV in RTC_SR depends on the value of CALEVSEL
31 30 29 28 27 26 25 24
– – – – – – – –
23 22 21 20 19 18 17 16
– – – – – – CALEVSEL
15 14 13 12 11 10 9 8
– – – – – – TIMEVSEL
7 6 5 4 3 2 1 0
– – – – – – UPDCAL UPDTIM
Value Name Description
0 MINUTE Minute change
1 HOUR Hour change
2 MIDNIGHT Every day at midnight
3 NOON Every day at noon
Value Name Description
0 WEEK Week change (every Monday at time 00:00:00)
1 MONTH Month change (every 01 of each month at time 00:00:00)
2 YEAR Year change (every January 1 at time 00:00:00)
3 –