> If you've made it so far then thanks, my question is what instruction should > I use to return from interrupts? It would seem to me that 'RETFIE' is the > most efficient, but the data book says to use the Fast Register Stack the > 'RETURN FAST' instruction should be used! Is the data book wrong? Or just > missleading? I have been trying to find some sample code for the 18F6620 to > see how it is done in that, but have not found any. On the 18F458, I use "RETFIE FAST" to return from interrupts with register restore. Perhaps it's the same for the 18FXX20? Good Luck, Lyle -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics