RTC: are interrupt flag set during Vbat mode

nicolas · ‎2025-11-18

I have a STM32U595 and I use the RTC in binary mode.

If an SSR underflow occurs during Vbat mode, will the SSRUF be set so after power recovery I can manage the interrupt ?

ELABI.1 · ‎2025-11-20

Yes, SSRUF will still be set when VDD is back, with interrupt generation, which can then be served after NVIC initialization.

You can refer to the Reference Manual RM0456 section 63 Real-time clock (RTC) for more information.

Thanks.

ELABI.1

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ELABI.1 · ‎2025-11-20

Hi @nicolas,

Yes, SSRUF will still be set when VDD is back, with interrupt generation, which can then be served after NVIC initialization.

You can refer to the Reference Manual RM0456 section 63 Real-time clock (RTC) for more information.

Thanks.

ELABI.1

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

nicolas · ‎2025-11-20

Thank you for the answer. I did look on the RM0456 but I didn't found this information.