Real-time clock (RTC) RM0453
1024/1461 RM0453 Rev 1
Bit 31 OUT2EN: RTC_OUT2 output enable
Setting this bit allows the RTC outputs to be remapped on RTC_OUT2 as follows:
OUT2EN = 0: RTC output 2 disable
If OSEL ≠ 00 or TAMPOE = 1: TAMPALRM is output on RTC_OUT1
If OSEL = 00 and TAMPOE = 0 and COE = 1: CALIB is output on RTC_OUT1
OUT2EN = 1: RTC output 2 enable
If (OSEL ≠ 00 or TAMPOE = 1) and COE = 0: TAMPALRM is output on RTC_OUT2
If OSEL = 00 and TAMPOE = 0 and COE = 1: CALIB is output on RTC_OUT2
If (OSEL≠ 00 or TAMPOE = 1) and COE = 1: CALIB is output on RTC_OUT2 and
TAMPALRM is output on RTC_OUT1.
Bit 30 TAMPALRM_TYPE: TAMPALRM output type
0: TAMPALRM is push-pull output
1: TAMPALRM is open-drain output
Bit 29 TAMPALRM_PU: TAMPALRM pull-up enable
0: No pull-up is applied on TAMPALRM output
1: A pull-up is applied on TAMPALRM output
Bits 28:27 Reserved, must be kept at reset value.
Bit 26 TAMPOE: Tamper detection output enable on TAMPALRM
0: The tamper flag is not routed on TAMPALRM
1: The tamper flag is routed on TAMPALRM, combined with the signal provided by OSEL and
with the polarity provided by POL.
Bit 25 TAMPTS: Activate timestamp on tamper detection event
0: Tamper detection event does not cause a RTC timestamp to be saved
1: Save RTC timestamp on tamper detection event
TAMPTS is valid even if TSE = 0 in the RTC_CR register. Timestamp flag is set after the
tamper flags, therefore if TAMPTS and TSIE are set, it is recommended to disable the
tamper interrupts in order to avoid servicing 2 interrupts.
Bit 24 ITSE: timestamp on internal event enable
0: internal event timestamp disabled
1: internal event timestamp enabled
Bit 23 COE: Calibration output enable
This bit enables the CALIB output
0: Calibration output disabled
1: Calibration output enabled
Bits 22:21 OSEL[1:0]: Output selection
These bits are used to select the flag to be routed to TAMPALRM output.
00: Output disabled
01: Alarm A output enabled
10: Alarm B output enabled
11: Wakeup output enabled
Bit 20 POL: Output polarity
This bit is used to configure the polarity of TAMPALRM output.
0: The pin is high when ALRAF/ALRBF/WUTF is asserted (depending on OSEL[1:0]), or
when a TAMPxF/ITAMPxF is asserted (if TAMPOE = 1).
1: The pin is low when ALRAF/ALRBF/WUTF is asserted (depending on OSEL[1:0]), or
when a TAMPxF/ITAMPxF is asserted (if TAMPOE = 1).
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