Rtc Interrupts; Table 113. Interrupt Control Bits - ST STM32F412 Reference Manual

RM0402
22.5

RTC interrupts

All RTC interrupts are connected to the EXTI controller.
To enable the RTC Alarm interrupt, the following sequence is required:
1. Configure and enable the EXTI Line 17 in interrupt mode and select the rising edge
sensitivity.
2. Configure and enable the RTC_Alarm IRQ channel in the NVIC.
3. Configure the RTC to generate RTC alarms (Alarm A or Alarm B).
To enable the RTC Wakeup interrupt, the following sequence is required:
1. Configure and enable the EXTI Line 22 in interrupt mode and select the rising edge
sensitivity.
2. Configure and enable the RTC_WKUP IRQ channel in the NVIC.
3. Configure the RTC to generate the RTC wakeup timer event.
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.
Alarm A
Alarm B
Wakeup
TimeStamp
Tamper1 detection
1. Wakeup from STOP and Standby modes is possible only when the RTC clock source is LSE or LSI.

Table 113. Interrupt control bits

Interrupt event
Enable
Event flag control
bit
ALRAF ALRAIE
ALRBF ALRBIE
WUTF WUTIE
TSF TSIE
TAMP1F TAMPIE
RM0402 Rev 6
Real-time clock (RTC)
Exit the Exit the
Sleep Stop
mode mode
(1)
yes yes
(1)
yes yes
(1)
yes yes
(1)
yes yes
(1)
yes yes
Exit the
Standby
mode
(1)
yes
(1)
yes
(1)
yes
(1)
yes
(1)
yes
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