18.6.6 RTC Time Alarm Register (Default Mode)

This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode register (SYSC_WPMR).

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 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 value (SEC, MIN, HOUR). The third access is required to re-enable the field by writing 1 in the SECEN, MINEN, HOUREN fields.

Name: RTC_TIMALR (DEFAULT_MODE)
Offset: 0x10
Reset: 0x00000000
Property: Read/Write

Bit 3130292827262524 
          
Access  
Reset  
Bit 2322212019181716 
 HOURENAMPMHOUR[5:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 00000000 
Bit 15141312111098 
 MINENMIN[6:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 00000000 
Bit 76543210 
 SECENSEC[6:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 00000000 

Bit 23 – HOUREN Hour Alarm Enable

ValueNameDescription
0 DISABLED

The hour-matching alarm is disabled.

1 ENABLED

The hour-matching alarm is enabled.

Bit 22 – AMPM AM/PM Indicator

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

Bits 21:16 – HOUR[5:0] Hour Alarm

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

Bit 15 – MINEN Minute Alarm Enable

ValueNameDescription
0 DISABLED

The minute-matching alarm is disabled.

1 ENABLED

The minute-matching alarm is enabled.

Bits 14:8 – MIN[6:0] Minute Alarm

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

Bit 7 – SECEN Second Alarm Enable

ValueNameDescription
0 DISABLED

The second-matching alarm is disabled.

1 ENABLED

The second-matching alarm is enabled.

Bits 6:0 – SEC[6:0] Second Alarm

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