Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

309

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

 RTC_CALALR

0x400E1474

 Read

/Write

This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register 

(SYSC_WPMR).

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 three accesses to the RTC_CALALR. 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

–

–

–

–

–

–

–

–