It depends on your code (that's the beauty of firmware--you get to choose!). Most likely, if your routine goes and reprograms all the timer registers then it is going to start over, that is, it will "add your time routine to the first" as you say. There could be something about the timer that prevents this but since no one has said as much I imagine you'll get the effect I described. To be sure, post your code as Michael suggested. Barry At 08:28 AM 9/6/02 -0300, you wrote: >I have a routine that receive a trigger pulse in an input, and then set >an output for a time. If I will have another trigger pulse before >finished my time in output set by the first pulse, my PIC will go to >ignore this trigger or will add my time routine to the first time in the >output? >Regards, >Wallace -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.