Hi Quentin I'm trying to use Asynchronous Stimulus as you mentioned but when I press the button, in Asynchronous Stimulus dialog, to change pin state system message "ignoring last sttimulus" informing me that "Asynchronous Stimulus for PIN RA3(H) before stimulus for RA3 processed. What should I do? should I do debug=>run=>animate? if so is there any way to reduce the speed? Thanks for your help Mohamed Elegairy E-mail : egairy@iname.com ICQ : 14668366 -----Original Message----- From: Quentin To: PICLIST@MITVMA.MIT.EDU Date: 11 February 1999 09:15 Subject: Re: Input & MPLAB >use Debug/Simulator stimulus. >Use Asynchronous Stimulus if you want to toggle the pin manually. Right >click on a button to assign a pin. I use toggle mode (click on, click >off). >Or you can use Clock stimulus where you can set the pin on for a amount >of cycles and then off for another amount. >Or you can write your own stimulus files, see Help. > >Quentin