Datasheet

275
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
16.6.7 RTC Status Register
Name: RTC_SR
Address: 0x400E1478
Access: Read-only
• ACKUPD: Acknowledge for Update
0 (FREERUN) = Time and calendar registers cannot be updated.
1 (UPDATE) = Time and calendar registers can be updated.
• ALARM: Alarm Flag
0 (NO_ALARMEVENT) = No alarm matching condition occurred.
1 (ALARMEVENT) = An alarm matching condition has occurred.
• SEC: Second Event
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.
• TIMEV: Time Event
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.
The time event is selected in the TIMEVSEL field in RTC_CR (Control Register) and can be any one of the following events: min-
ute change, hour change, noon, midnight (day change).
• CALEV: Calendar Event
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.
The calendar event is selected in the CALEVSEL field in RTC_CR and can be any one of the following events: week change,
month change and year change.
• TDERR: Time and/or Date Free Running Error
0 (CORRECT) = The internal free running counters are carrying valid values since the last read of 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.
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76543210
– – TDERR CALEV TIMEV SEC ALARM ACKUPD