Solved: STM32H743 RTC freeze when power is off - STMicroelectronics Community

The RTC program is tested with LSE

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Reply in https://community.st.com/s/question/0D53W00001SNQU0SAP/i-am-using-an-stm32h743-user-board-with-stmcubeide-i-want-to-use-the-internal-rtc-calendar-with-the-internal-clock-lsiq-first-power-on-clock-start-172000-then-time-is-going-for-example-when-time-is-172050-suddenly-i-power-off-the