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 274

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

Name: RTC_CALALR

0x400E1474

Access: Read-write

Note:

To change one of the DATE, MONTH fields, it is recommended to disable the field before changing the value and 
then re-enable it after the change has been made. This requires up to 3 accesses to the RTC_CALALR register. The 
first access clears the enable corresponding to the field to change (DATEEN,MTHEN). If the field is already cleared, 
this access is not required. The second access performs the change of the value (DATE,MONTH). The third access is 
required to re-enable the field by writing 1 in DATEEN, MTHEN fields.

This field is the alarm field corresponding to the BCD-coded month counter.

0 = The month-matching alarm is disabled.

1 = The month-matching alarm is enabled.

This field is the alarm field corresponding to the BCD-coded date counter.

0 = The date-matching alarm is disabled.

1 = The date-matching alarm is enabled.

31

30

29

28

27

26

25

24

DATEEN

–

DATE

23

22

21

20

19

18

17

16

MTHEN

–

–

MONTH

15

14

13

12

11

10

9

8

–

–

–

–

–

–

–

–

7

6

5

4

3

2

1

0

–

–

–

–

–

–

–

–