It seems that the 18FXX20 have been downgraded to 25MHz, due to some flash memory speed concern. Forntunately, since I do program in ASM, there is the workout, and full 40MHz can be achieved. For C programs, since the used does not control the order of instruction, the proper workout might be impossible.. SC "information guessed by inspection of the Microchip website". -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads