Since you say you are a beginner, and I am one as well, I thought I 
would make sure that you are resetting the INT0IF in the interrupt routine.

Dumb mistake I have made a few times already.

While I am at it.... make sure that no other interrupts are enabled, or 
at least they are handled (???IF = 0) if they are enabled.

Rolf

Robertino Benis wrote:
> Hi
>
> I have one simple (and most likely quite stupid) beginner's question:  
>
> How long is too long to keep an interrupt pin high on PIC 18F452? Does this
> question make sense? I was not able to find that in PIC sheet from
> Microchip. 
>
> I was testing with a 'push-on' switch that caused some odd behavior in
> interrupt handling routine (interrupt pin: RB0/INT0). 
>
> My interrupt handling routine would change some values of variables in RAM
> which would change how long the test LED lights and then switches off. Maybe
> the routine was just badly written, but it may have something to do with how
> long was that INT0 pin kept HIGH... 
>
> Any thoughts/comments?
>
> Thank you...  
> r.
>
>   

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