Datasheet

345
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
16.6.5 RTC Time Alarm Register
Name: RTC_TIMALR
Address: 0x400E1870
Access: 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 SEC, MIN, HOUR 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_TIMALR. The first access clears the
enable corresponding to the field to change (SECEN, MINEN, HOUREN). If the field is already cleared, this access is not
required. The second access performs the change of the value (SEC, MIN, HOUR). The third access is required to re-enable the
field by writing 1 in SECEN, MINEN, HOUREN fields.
 SEC: Second Alarm
This field is the alarm field corresponding to the BCD-coded second counter.
 SECEN: Second Alarm Enable
0: The second-matching alarm is disabled.
1: The second-matching alarm is enabled.
 MIN: Minute Alarm
This field is the alarm field corresponding to the BCD-coded minute counter.
 MINEN: Minute Alarm Enable
0: The minute-matching alarm is disabled.
1: The minute-matching alarm is enabled.
 HOUR: Hour Alarm
This field is the alarm field corresponding to the BCD-coded hour counter.
 AMPM: AM/PM Indicator
This field is the alarm field corresponding to the BCD-coded hour counter.
 HOUREN: Hour Alarm Enable
0: The hour-matching alarm is disabled.
1: The hour-matching alarm is enabled.
31 302928 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
HOUREN AMPM HOUR
15 14 13 12 11 10 9 8
MINEN MIN
76543 210
SECEN SEC