Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK 数据表
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产品代码
AT91SAM9X25-EK
130
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
15.6.7 RTC Status Register
Name: RTC_SR
Address:
0xFFFFFEC8
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).
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.
month change and year change.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
–
7
6
5
4
3
2
1
0
–
–
–
CALEV
TIMEV
SEC
ALARM
ACKUPD