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1745D–ATARM–04-Nov-05
AT91M55800A
13.3.7 RTC Status Register
Register Name: RTC_SR
Access Type: Read-only
Reset State: 0x0
Offset: 0x18
• ACKUPD: Acknowledge for Update (Code Label RTC_ACKUPD)
0 = Time and Calendar registers cannot be updated.
1 = Time and Calendar registers can be updated.
• ALARM: Alarm Flag (Code Label RTC_ALARM)
0 = No alarm matching condition occurred.
1 = An alarm matching condition has occurred.
• SEC: Second Event (Code Label RTC_SEC)
0 = No second event has occurred since the last clear.
1 = At least one second event has occurred since the last clear.
• TIMEV: Time Event (Code Label RTC_TIMEV)
0 = No time event has occurred since the last clear.
1 = At least one time event has occurred since the last clear.
The time event is selected in the TEVSEV field in RTC_CR and can be any one of the following events: minute change,
hour change, noon, midnight (day change).
• CALEV: Calendar Event (Code Label RTC_CALEV)
0 = No calendar event has occurred since the last clear.
1 = At least one calendar event has occurred since the last clear.
The calendar event is selected in the CEVSEL field in RTC_CR and can be any one of the following events: week change,
month change, year change.
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CALEV TIMEV SEC ALARM ACKUPD