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?... -- Ciao, Dario -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist