> > I have a problem.
> > I am using a PIC16F877 and a timer triggered IRQ service routine.
> 
> 
> could you try placing the ISR code directly into place, 
> rather than "calling" it?
> Could it be a stack overflow?...

Stack? Is there a stack in a 16F877A?

Anyway, the code for the ISR is big, and it is not the ISR, which is
hanging.
There is a small routine to have a LED blinking with the ISR, and this
LED is always blinking.

Another LED was put inside the main, and that one is stopping blinking.

Best Jens

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