How to re-fetch the RTC value after power restored

[meghasb]

Hi all

I working on the RTC on the STM32U585 with battery backup, after the date/time been set and running i want to re-fetch these values once the device restores the main power or happens even after reset (with main power), As i have a batterybackup, i no need to set the date and time again after reset of the controller but it keeps the same date and time(which is running on RTC). how is this done?

[waclawek.jan]

Set RCC_APB3ENR.RTCAPBEN, and after that, you can read out RTC_TR and RTC_DR (in that order).

Read Reading the calendar subchapter of RTC chapter in RM.

JW