27.6.1 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).
Name: | RTC_CR |
Offset: | 0x00 |
Reset: | 0x00000000 |
Property: | Read/Write |
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 |
Bits 17:16 – CALEVSEL[1:0] Calendar Event Selection
The event that generates the flag CALEV in RTC_SR depends on the value of CALEVSEL
Value | Name | Description |
---|---|---|
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 |
Bits 9:8 – TIMEVSEL[1:0] Time Event Selection
The event that generates the flag TIMEV in RTC_SR depends on the value of TIMEVSEL.
Value | Name | Description |
---|---|---|
0 | MINUTE | Minute change |
1 | HOUR | Hour change |
2 | MIDNIGHT | Every day at midnight |
3 | NOON | Every day at noon |
Bit 1 – UPDCAL 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.
Value | Description |
---|---|
0 | No effect or, if UPDCAL has been previously written to 1, stops the update procedure. |
1 | Stops the RTC calendar counting. |
Bit 0 – UPDTIM 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.
Value | Description |
---|---|
0 | No effect or, if UPDTIM has been previously written to 1, stops the update procedure. |
1 | Stops the RTC time counting. |