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Timer output looped to counter input

Question asked by John Lowen on Aug 2, 2017
Latest reply on Aug 2, 2017 by Clive One

I am using an STM32F746 for PWM generation and counting. When I loop the PWM output back to a counter, the amplitude of the PWM drops from 3.3v to about 2.0v. If I set the counter pin to input mode, the 3.3 v level is restored regardless of any pullup configuration. What is there about the counter input that will cause a timer output to drop when configured in counter mode?

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