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small but tricky problem about 50hz reading anyone solve it?

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ASIM_76

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how can i read 50Hz with PIC. i am using pic basic plus but i cant use pulsin command for this purpose bcaz i my main loop i cant wait so long.
can i read 50Hz square wave through interrupts if i use portb.0 for the hardware interrupt, i cant use CCP pin for capture purpose bcaz i am generating PWM with this pin. i am using 16f73 with xtal 4Mhz.
i am waiting reply,
thanx in advance.
 

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