FMT=B_0x0
RTC_CR register
| WUCKSEL | Wakeup clock selection 000: RTC/16 clock is selected 001: RTC/8 clock is selected 010: RTC/4 clock is selected 011: RTC/2 clock is selected 10x: ck_spre (usually 1 Hz) clock is selected 11x: ck_spre (usually 1 Hz) clock is selected and 216 is added to the WUT counter value |
| BYPSHAD | Bypass the shadow registers 0: Calendar values (when reading from RTC_SSR, RTC_TR, and RTC_DR) are taken from the shadow registers, which are updated once every two RTCCLK cycles. 1: Calendar values (when reading from RTC_SSR, RTC_TR, and RTC_DR) are taken directly from the calendar counters. |
| FMT | Hour format 0 (B_0x0): 24 hour/day format 1 (B_0x1): AM/PM hour format |
| ALRAE | Alarm A enable 0: Alarm A disabled 1: Alarm A enabled |
| WUTE | Wakeup timer enable 0: Wakeup timer disabled 1: Wakeup timer enabled |
| ALRAIE | Alarm A interrupt enable 0: Alarm A interrupt disabled 1: Alarm A interrupt enabled |
| WUTIE | Wakeup timer interrupt enable 0: Wakeup timer interrupt disabled 1: Wakeup timer interrupt enabled |
| ADD1H | Add 1 hour (summer time change) When this bit is set outside initialization mode, 1 hour is added to the calendar time. This bit is always read as 0. 0: No effect 1: Adds 1 hour to the current time. This can be used for summer time change |
| SUB1H | Subtract 1 hour (winter time change) When this bit is set outside initialization mode, 1 hour is subtracted to the calendar time if the current hour is not 0. This bit is always read as 0. Setting this bit has no effect when current hour is 0. 0: No effect 1: Subtracts 1 hour to the current time. This can be used for winter time change. |
| BKP | Backup This bit can be written by the user to memorize whether the daylight saving time change has been performed or not. |
| COSEL | Calibration output selection When COE=1, this bit selects which signal is output on RTC_CALIB. 0: Calibration output is 512 Hz 1: Calibration output is 1 Hz These frequencies are valid for RTCCLK at 32.768 kHz and prescalers at their default values (PREDIV_A=127 and PREDIV_S=255). |
| POL | Output polarity This bit is used to configure the polarity of RTC_ALARM output 0: The pin is high when ALRAF/WUTF is asserted (depending on OSEL[1:0]) 1: The pin is low when ALRAF/WUTF is asserted (depending on OSEL[1:0]). |
| OSEL | Output selection These bits are used to select the flag to be routed to RTC_ALARM output 00: Output disabled 01: Alarm A output enabled 10: Reserved 11: Wakeup output enabled |
| COE | Calibration output enable This bit enables the RTC_CALIB output 0: Calibration output disabled 1: Calibration output enabled |