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MHaji.1
Visitor II
September 7, 2024
Solved

RTC Drift

  • September 7, 2024
  • 1 reply
  • 916 views

Hi,

I have a custom board by STM32H743 and have some problems by RTC. I've used LSE with a 32.768 KHz external crystal. I have 2 or 3 seconds more in each minute. There is no reset within 3 minute and I see about 15 second more.

I've used 6.8 pF for CL1 and CL2...

Please help me.

    This topic has been closed for replies.
    Best answer by MHaji.1

    Hi, 

    It seems bad register writing is the main cause, before set time or date, all of parameters should be initialized like WeekDay and etc, if not, some wrong numbers will write to registers and LSE change to LSI because of errors...

    After initializing all parameters and then writing them, problem is solved... I'm writing this, hoping solve others problem..

    Thanks.

    1 reply

    M
    MHaji.1AuthorAnswer
    Visitor II
    September 7, 2024

    Hi, 

    It seems bad register writing is the main cause, before set time or date, all of parameters should be initialized like WeekDay and etc, if not, some wrong numbers will write to registers and LSE change to LSI because of errors...

    After initializing all parameters and then writing them, problem is solved... I'm writing this, hoping solve others problem..

    Thanks.

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