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Zero crossing time measurement

Thread starter #1
I want to measure the time interval between every zero crossings for 5V AC input signal using the PIC16f877a.
I understand c programming but I am struggling to measure the time interval between every zero crossings. I did google search and found that I have to use Analog Comparator, Interrupt and CCP Module.

How to detect every zero crossing ?

if crossing detect then how to measure time ?
 

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