RTC_CR

RTC Control Register

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

  0x00 32 Read/Write 0x00000000  

RTC Control Register

Bit  31 30 29 28 27 26 25 24  
                   
Access                   
Reset                   
Bit  23 22 21 20 19 18 17 16  
              CALEVSEL[1:0]  
Access              R/W R/W  
Reset              0 0  
Bit  15 14 13 12 11 10 9 8  
              TIMEVSEL[1:0]  
Access              R/W R/W  
Reset              0 0  
Bit  7 6 5 4 3 2 1 0  
              UPDCAL UPDTIM  
Access              R/W R/W  
Reset              0 0  

Bit 0 – UPDTIM: Update Request Time Register

Update Request Time Register

Time counting consists of second, minute and hour counters. Time counters can be programmed once this bit is set and acknowledged by the bit ACKUPD of the RTC_SR.

ValueDescription
0

No effect or, if UPDTIM has been previously written to 1, stops the update procedure.

1

Stops the RTC time counting.

Bit 1 – UPDCAL: Update Request Calendar Register

Update Request Calendar Register

Calendar counting consists of day, date, month, year and century counters. Calendar counters can be programmed once this bit is set and acknowledged by the bit ACKUPD of the RTC_SR.

ValueDescription
0

No effect or, if UPDCAL has been previously written to 1, stops the update procedure.

1

Stops the RTC calendar counting.

Bits 9:8 – TIMEVSEL[1:0]: Time Event Selection

Time Event Selection

The event that generates the flag TIMEV in RTC_SR depends on the value of TIMEVSEL.

ValueNameDescription
0 MINUTE

Minute change

1 HOUR

Hour change

2 MIDNIGHT

Every day at midnight

3 NOON

Every day at noon

Bits 17:16 – CALEVSEL[1:0]: Calendar Event Selection

Calendar Event Selection

The event that generates the flag CALEV in RTC_SR depends on the value of CALEVSEL

ValueNameDescription
0 WEEK

Week change (every Monday at time 00:00:00)

1 MONTH

Month change (every 01 of each month at time 00:00:00)

2 YEAR

Year change (every January 1 at time 00:00:00)

3 YEAR

Reserved