Datasheet

300
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
16.6.5 RTC Time Alarm Register
Name: RTC_TIMALR
Address: 0x400E1470
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 30 29 28 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
76543210
SECEN SEC