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nRF52 max. input frequency on GPIO

Hi all,

I am trying to count the positive edges of a 3.5MHz signal with GPIOTE, PPI and the TIMER1. Unfortunately i can only measure to frequencies up to a little more than 1MHz. What is the limitating factor here.

With the nRF51 I was able to measure that without problems.

I guess it's the GPIOs input capability but there is no information about that. Maybe you can provide me with more information.

Thank you!

Moved question. More explained here

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