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Power controller (PWR) RM0090

103/1422 Doc ID 018909 Rev 4

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

ST STM32F40 Series User Manual

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