How to configure RTC_WUT_S wake-up source of WKUP6 event on STM32U545?

[EMRandone]

Dear Sirs,

I would like to wake-up the STM32U545 using a WKUP6 event and the RTC_WUT_S source event.

I'm absolutely not an expert, and this is the first time that I try to wake-up the MCU.

I have not found any information on how to set the RTC_WUT_S register.

Also, what does the "_S" stand for?

Could you please help?

Thank you,

Enrico.

[Imen.D]

Hello @EMRandone ,

This article describes how to use an RTC as a wake-up source:

How to use the RTC in STM32 microcontrollers for p... - STMicroelectronics Community

Regarding the "_S" suffix, it is for "secure" indicating that the register or feature is related to the secure domain. 

So, If the RTC is secured, it use the WKUP6.