Problem with STM32F767 and LSE
Good afternoon,
I’m trying to use the LSE to clock the RTC of the STM32F767 but I’m experiencing some problems:
1) the clock is always slower (about 10%), no matter of the capacitor installed (even without the capacitors)
2) there is a jitter on the oscillator signal even if the RTC is powered by the Vbat and the uC is not powered
3) if I try to measure with an oscilloscope the LSE stops (the probe is 10:1)
4) every time the uC starts the LSE slows down for about 1s or 2s and then returns to the “almost normal” speed (I’ve checked it using the RTC calibration output)
Any clues?
Simone
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