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RTC clock source

Question asked by Moamen Ayman on Oct 3, 2016
Latest reply on Oct 5, 2016 by Clive One
Hello, I'm a little confused about choosing the better clock source for the RTC, is it better to drive it through HSE with 4MHz 10ppm frequency tolerance or using additional 32.768KHz LSE with also 10ppm tolerance? do the two choice will cause same accuracy or when using LSE crystal is better with respect to resulted accuracy? 
thanks in advance