Hi, I was interested in doing an frequency counter. Great ! There is an application note in the Microchip book (frequency counter, I think the number is an592). I read it, and I didn't understand how it works. I thought the best to do is to get the file from Microchip and simulated it. But, the file was in Postscript. So, I had to type it ! After simulation, my conclusion is (but perhaps I'm wrong): This file can't work !! Example: movlw B'10000100' seams to be the instruction to configure the entry port ! So, my questions are: Am I wrong, or some files (or perhaps the most of them) of the Microchip book were not tested ? If so, where can I find a list of file tested ? Thanks for reply Yves Bergeon