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Why RTC_WakeUpCmd can fail?

GBert.2
Senior

In the STM8L SDK, the RTC_WakeUpCmd()  function can return an ERROR if the WUTWF bit fails to be set after a delay.

0693W00000AMn9zQAD.png 

0693W00000AMn8SQAT.png 

In the RM there's no mention of how and why this situation would occur.

Why RTC_WakeUpCmd can fail?

Thanks,

Gabriel

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