Internal MCU modules

To detect Presence of 50HZ PWM signal on RB Port interrupt on change interrupt

Hello,

I have little problem regarding the Interrupt on change function. I have very simple application. I have 2 sources different sources having 50HZ PWM signal coming i just want to detect the presence of 50HZ PWM signal and when its continous high logic. but i am not able to use interrupt on change function to check the presence of PWM signal on both RB4 & RB5.

Thanks.

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