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STM32F4 RTC and LSI question

Question asked by icecoldies on Mar 17, 2013
Latest reply on Mar 17, 2013 by icecoldies

I'm just wondering why the LSI on the STM32F4 Discovery board has inaccuracy's, I've searched the internet and application notes but can't seem to find the answer? My seconds on LCD jumps several times between 0-60, the time also counts up to 100 on seconds and what look likes 999 on mins and hours even though I've set 24 hour format as below:

 RTC_InitStruct.RTC_HourFormat = RTC_HourFormat_24;

Any help appreciated.