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Detecting LSE failure

Question asked by mcwiggin.patrick on Jun 23, 2014
I want to detect failure of the LSE using LSE_CSS. Main clock is HSI but LSE clcoks the RTC and provides a 50mS systick via the wakeup interrupt. When not busy the micro executes the HALT instruction to save power until the next wakeup.

The LSE_CSS uses the LSI. Will this mechanism work if the LSE fails while the micro is in HALT mode as the LSI can't operate in HALT mode according to the datasheet ?