Jens M. Guessregen / Mailinglists wrote:
>>> 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?
>   
"all" PIC16 have a 8 level deep stack for call/return, see DS39582B 
section 2.0 Memory organization!!!
> Anyway, the code for the ISR is big, and it is not the ISR, which is
> hanging.
>   
My english is bad but... there is not a contradiction?
In any case because the ISR interrupt (!) the main code it (ISR) can not 
hang but can (often occurs) let hang the main code.

> 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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