> But I can't find as what you said in 'p18f452.inc' & 'p18c452.inc'. > Is there anything possibly wrong with my MPLAB v6.40. It wouldn't surprise me. I don't use 6.40, perhaps someone who does can try to compile CLRW for a 452 Is your compilation accessing a good .inc file ? Mine is in \Program Files\MPLAB IDE\MCHIP_Tools -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu