RTC_TIMALR

RTC Time Alarm Register

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 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.

  0x10 32 Read/Write 0x00000000  

RTC Time Alarm Register

Bit  31 30 29 28 27 26 25 24  
                   
Access                   
Reset                   
Bit  23 22 21 20 19 18 17 16  
  HOUREN AMPM HOUR[5:0]  
Access  R/W R/W R/W R/W R/W R/W R/W R/W  
Reset  0 0 0 0 0 0 0 0  
Bit  15 14 13 12 11 10 9 8  
  MINEN MIN[6:0]  
Access  R/W R/W R/W R/W R/W R/W R/W R/W  
Reset  0 0 0 0 0 0 0 0  
Bit  7 6 5 4 3 2 1 0  
  SECEN SEC[6:0]  
Access  R/W R/W R/W R/W R/W R/W R/W R/W  
Reset  0 0 0 0 0 0 0 0  

Bits 6:0 – SEC[6:0]: Second Alarm

Second Alarm

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

Bit 7 – SECEN: Second Alarm Enable

Second Alarm Enable

ValueDescription
0

The second-matching alarm is disabled.

1

The second-matching alarm is enabled.

Bits 14:8 – MIN[6:0]: Minute Alarm

Minute Alarm

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

Bit 15 – MINEN: Minute Alarm Enable

Minute Alarm Enable

ValueDescription
0

The minute-matching alarm is disabled.

1

The minute-matching alarm is enabled.

Bits 21:16 – HOUR[5:0]: Hour Alarm

Hour Alarm

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

Bit 22 – AMPM: AM/PM Indicator

AM/PM Indicator

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

Bit 23 – HOUREN: Hour Alarm Enable

Hour Alarm Enable

ValueDescription
0

The hour-matching alarm is disabled.

1

The hour-matching alarm is enabled.