RM0090: Reference manual - STMicroelectronics

RM0090 Power control (PWR)
RTC alternate functions to wake up the device from the Stop mode
● To wake up the device from the Stop mode with an RTC alarm event, it is necessary to:
a) Configure the EXTI Line 17 to be sensitive to rising edges (Interrupt or Event
modes)
b) Enable the RTC Alarm Interrupt in the RTC_CR register
c) Configure the RTC to generate the RTC alarm
● To wake up the device from the Stop mode with an RTC tamper or time stamp event, it
is necessary to:
a) Configure the EXTI Line 21 to be sensitive to rising edges (Interrupt or Event
modes)
b) Enable the RTC time stamp Interrupt in the RTC_CR register or the RTC tamper
interrupt in the RTC_TAFCR register
c) Configure the RTC to detect the tamper or time stamp event
● To wake up the device from the Stop mode with an RTC wakeup event, it is necessary
to:
a) Configure the EXTI Line 22 to be sensitive to rising edges (Interrupt or Event
modes)
b) Enable the RTC wakeup interrupt in the RTC_CR register
c) Configure the RTC to generate the RTC Wakeup event
RTC alternate functions to wake up the device from the Standby mode
● To wake up the device from the Standby mode with an RTC alarm event, it is necessary
to:
a) Enable the RTC alarm interrupt in the RTC_CR register
b) Configure the RTC to generate the RTC alarm
● To wake up the device from the Standby mode with an RTC tamper or time stamp
event, it is necessary to:
a) Enable the RTC time stamp interrupt in the RTC_CR register or the RTC tamper
interrupt in the RTC_TAFCR register
b) Configure the RTC to detect the tamper or time stamp event
● To wake up the device from the Standby mode with an RTC wakeup event, it is
necessary to:
a) Enable the RTC wakeup interrupt in the RTC_CR register
b) Configure the RTC to generate the RTC wakeup event
Doc ID 018909 Rev 3 104/1416