16f88 interrupt

[mister_e]

there's a kinda mess in that

But if you want to trigger an INT0 interrupt, PORTB.0 must be set as an input.

[mister_e]

try this one

        @ DEVICE INTRC_OSC, LVP_OFF, WDT_OFF, MCLR_OFF
        
        DEFINE OSC 4
        OSCCON=%01101000
        ANSEL=%00000000
        CMCON=%00000111
        
        OPTION_REG.6=1 'Trigger on rising edge
        
        trisa = %11111111
        trisb = %00000001
        CounterA    var word

        On Interrupt Goto UpdateCounter
        INTCON = %10010000 'Enable INTE
        
        PORTB=0
        Pause 50 ' Wait for startup

loop:
        TOGGLE PORTB.5
        gosub dodelay
        Goto loop 
        
DoDelay:
        for countera=0 to 200
            pause 1
            next
        return        


disable
UpdateCounter:
        low PORTB.5
        high portb.6
        Pause 2000 ' Wait 2 second
        low portb.6
        INTCON.1=0 're-enable interrupts
resume
ENABLE

[tur_bot]

try this one

        @ DEVICE INTRC_OSC, LVP_OFF, WDT_OFF, MCLR_OFF
        
        DEFINE OSC 4
        OSCCON=%01101000
        ANSEL=%00000000
        CMCON=%00000111
        
        OPTION_REG.6=1 'Trigger on rising edge
        
        trisa = %11111111
        trisb = %00000001
        CounterA    var word

        On Interrupt Goto UpdateCounter
        INTCON = %10010000 'Enable INTE
        
        PORTB=0
        Pause 50 ' Wait for startup

loop:
        TOGGLE PORTB.5
        gosub dodelay
        Goto loop 
        
DoDelay:
        for countera=0 to 200
            pause 1
            next
        return        


disable
UpdateCounter:
        low PORTB.5
        high portb.6
        Pause 2000 ' Wait 2 second
        low portb.6
        INTCON.1=0 're-enable interrupts
resume
ENABLE

thank you very much , it was the trisb=0000001 command that resolved the problem. it works as expected but one more thing is not right, the portb.6 output 1.62 volts when the program goes through interrupt instead of giving a 5 volts output (a good logic one) as expected.
is it supposed to be like this?????

thank you again.

[mister_e]

Nope, seems you have a dead I/O, or faulty connections... or a dead output caused by a faulty connection