RM0090: Reference manual - STMicroelectronics

RM0090 Real-time clock (RTC)
To enable the RTC Tamper interrupt, the following sequence is required:
1. Configure and enable the EXTI Line 21 in interrupt mode and select the rising edge
sensitivity.
2. Configure and Enable the TAMP_STAMP IRQ channel in the NVIC.
3. Configure the RTC to detect the RTC tamper event.
To enable the RTC TimeStamp interrupt, the following sequence is required:
1. Configure and enable the EXTI Line 21 in interrupt mode and select the rising edge
sensitivity.
2. Configure and Enable the TAMP_STAMP IRQ channel in the NVIC.
3. Configure the RTC to detect the RTC timestamp event.
Table 96. Interrupt control bits
Interrupt event Event flag
Enable
control
bit
Exit the
Sleep
mode
Exit the
Stop
mode
Alarm A ALRAF ALRAIE yes yes (1)
Alarm B ALRBF ALRBIE yes yes (1)
Wakeup WUTF WUTIE yes yes (1)
TimeStamp TSF TSIE yes yes (1)
Tamper1 detection TAMP1F TAMPIE yes yes (1)
Tamper2 detection (2)
TAMP2F TAMPIE yes yes (1)
1. Wakeup from STOP and Standby modes is possible only when the RTC clock source is LSE or LSI.
2. If RTC_TAMPER2 pin is present. Refer to device datasheet pinout.
Exit the
Standby
mode
yes (1)
yes (1)
yes (1)
yes (1)
yes (1)
yes (1)
Doc ID 018909 Rev 3 636/1416