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Timer interval not as expected

Hi Community,

I am trying to program a timer to get a clean timebase of 50ms. But for some reason

A) the timer is little slower as expected. I have to add few counts to get close to my 50ms

B) I have a jitter of about 70us.

Do you have any idea what is wrong?

I measured the timer interval with an oscilloscope on a led pin.

Regards,

Arne