RM0367 Rev 7 667/1043
RM0367 Real-time clock (RTC)
694
The RTC_TAMPx inputs are precharged through the I/O internal pull-up resistance before
its state is sampled, unless disabled by setting TAMPPUDIS to 1,The duration of the
precharge is determined by the TAMPPRCH bits, allowing for larger capacitances on the
RTC_TAMPx inputs.
The trade-off between tamper detection latency and power consumption through the pull-up
can be optimized by using TAMPFREQ to determine the frequency of the sampling for level
detection.
Note: Refer to the datasheets for the electrical characteristics of the pull-up resistors.
For code example, refer to A.15.6: RTC tamper and time stamp configuration code example.
27.4.15 Calibration clock output
When the COE bit is set to 1 in the RTC_CR register, a reference clock is provided on the
RTC_CALIB device output.
If the COSEL bit in the RTC_CR register is reset and PREDIV_A = 0x7F, the RTC_CALIB
frequency is f
RTCCLK
/64
. This corresponds to a calibration output at 512 Hz for an RTCCLK
frequency at 32.768 kHz. The RTC_CALIB duty cycle is irregular: there is a light jitter on
falling edges. It is therefore recommended to use rising edges.
When COSEL is set and “PREDIV_S+1” is a non-zero multiple of 256 (i.e: PREDIV_S[7:0] =
0xFF), the RTC_CALIB frequency is f
RTCCLK/(256 * (PREDIV_A+1)). This corresponds to a
calibration output at 1 Hz for prescaler default values (PREDIV_A = Ox7F, PREDIV_S =
0xFF), with an RTCCLK frequency at 32.768 kHz. The 1 Hz output is affected when a shift
operation is on going and may toggle during the shift operation (SHPF=1).
Note: When the RTC_CALIB or RTC_ALARM output is selected, the RTC_OUT pin is
automatically configured as output.
When COSEL bit is cleared, the RTC_CALIB output is the output of the 6th stage of the
asynchronous prescaler.
When COSEL bit is set, the RTC_CALIB output is the output of the 8th stage of the
synchronous prescaler.
For code example, refer to A.15.7: RTC tamper and time stamp code example.
27.4.16 Alarm output
The OSEL[1:0] control bits in the RTC_CR register are used to activate the alarm output
RTC_ALARM, and to select the function which is output. These functions reflect the
contents of the corresponding flags in the RTC_ISR register.
The polarity of the output is determined by the POL control bit in RTC_CR so that the
opposite of the selected flag bit is output when POL is set to 1.
Alarm output
The RTC_ALARM pin can be configured in output open drain or output push-pull using the
control bit RTC_ALARM_TYPE in the RTC_OR register.
Note: Once the RTC_ALARM output is enabled, it has priority over RTC_CALIB (COE bit is don't
care and must be kept cleared).
When the RTC_CALIB or RTC_ALARM output is selected, the RTC_OUT pin is
automatically configured as output.
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