Rtc Option Register (Rtc_Or) - ST STM32L4x6 Reference Manual

Real-time clock (RTC)
34.6.19

RTC option register (RTC_OR)

Address offset: 0x4C
Backup domain reset value: 0x0000 0000
System reset: not affected
31 30 29
Res. Res. Res. Res.
15 14 13
Res. Res. Res. Res.
Bits 31:2 Reserved, must be kept at reset value.
Bit 1 RTC_OUT_RMP: RTC_OUT remap
If OSEL /= "00" and COE = '1': RTC_CALIB is output on PB14 and RTC_ALARM is output on
PC13.
Bit 0 RTC_ALARM_TYPE: RTC_ALARM output type on PC13
34.6.20 RTC backup registers (RTC_BKPxR)
Address offset: 0x50 to 0xCC
Backup domain reset value: 0x0000 0000
System reset: not affected
31 30 29
rw rw rw
15 14 13
rw rw rw
1104/1693
28 27 26 25
Res. Res. Res.
12 11 10 9
Res. Res. Res.
Setting this bit allows to remap the RTC outputs on PB14 as follows:
RTC_OUT_RMP = '0':
If OSEL/= "00" : RTC_ALARM is output on PC13
If OSEL= "00" and COE = '1' : RTC_CALIB is output on PC13
RTC_OUT_RMP = '1':
If OSEL /= "00" and COE = '0' : RTC_ALARM is output on PB14
If OSEL = "00" and COE = '1': RTC_CALIB is output on PB14
This bit is set and cleared by software
0: RTC_ALARM, when mapped on PC13, is open-drain output
1: RTC_ALARM, when mapped on PC13, is push-pull output
28 27 26 25
rw rw rw rw
12 11 10 9
rw rw rw rw
DocID024597 Rev 3
24 23 22 21
Res. Res. Res. Res.
8 7 6 5
Res. Res. Res. Res.
24 23 22 21
BKP[31:16]
rw rw rw rw
8 7 6 5
BKP[15:0]
rw rw rw rw
20 19 18 17
Res. Res. Res. Res.
4 3 2 1
RTC_
Res. Res. Res. OUT_
RMP
rw
20 19 18 17
rw rw rw rw
4 3 2 1
rw rw w rw
RM0351
16
Res.
0
RTC_
ALARM
_TYPE
rw
16
rw
0
rw