Tony K|bek wrote : > Anyway, back to your problem, the 18F452 (and family) can > access bascilly two types of ram, one called access ram > which is the lowest 128 bytes of available ram 0x0000 - > 0x007F (general purpose) and the top 128 bytes of ram > 0x0F7F - 0x0FFF (SFR's). Yes, true for the 18F452, but not for the whole "18-family". As you wrote, check the actual data sheet... :-) (Hint, check the 18F6xxx and 18F8xxx families.) Jan-Erik. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.