>Anybody know why a value has to be retrieved from >this position (3FFh) rather than just enter it yourself. >Is this value something that varies from batch to batch? >What also worries me is an erase of the chip loses this >important value. I recently read the online manual for the PICKit1, and I believe it is equipped to cal these chips. Not sure, but you may want to DL the manual and check. Lyle -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads