Interrupt INTERFACING in PIC16f877A

[bijaypaudel]

I NEED TO TAKE INTERRUPT FROM THREE SOURCES TO pic...
>TO COUNT NO. OF CLOCK PULSES
>cOUNT NO. OF BUTTONS PUSHED
>START COUNT WHEN A BUTTON IS PUSHE AND UNTIL RELEASED

SO, NEED TO COMBINE THESE THREE THING IN A INTERRUPT PIN ...PLZ HELP


THANKS IN advance............

 

[Tahmid]

Use the PORTB interrupt-on-change for counting number of buttons pushed and to start counting when a button is pushed and until released. For counting number of clock pulses, use the RB0/INT pin.

In the interrupt vector, check which interrupt occurred.

Hope this helps.
Tahmid.