> > I don't know why MPASM can understand 64h but not FFh. > > Because "FFh" looks like a label. Use "0FFh", instead. I don't think it understands "FFh" either. As far as I know, you have to write "h'FF'" or "0xFF". ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu