6 Replies Latest reply on Dec 7, 2018 5:53 AM by JoDr_3827906

    Date and Time reset at power off/on

    JoDr_3827906

      I lose my date time when VDD power lost.  We do have a battery connected to VBAT. 

       

      I think we are missing some configuration for enabling battery back up.

       

      We are doing the following:

      [..] To enable access to the RTC Domain and RTC registers, proceed as follows:

         Enable the Power Controller (PWR) APB1 interface clock using the

             RCC_APB1PeriphClockCmd() function.

         Enable access to RTC domain using the PWR_BackupAccessCmd() function.

         Select the RTC clock source using the RCC_RTCCLKConfig() function.

         Enable RTC Clock using the RCC_RTCCLKCmd() function.

       

      Is there more we need to do?

       

      Thanks!