(Disclaimer: I haven't read the datasheet yet, but I _HAVE_ printed it, and I _DO_ intend to read it...when I get the time :) So does the PLL multiply by 4, then the PIC divides by four? Or is instructions/clock cycle different on the 18f? Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams Olin Lathrop wrote: > The 18 parts contain a phase lock loop that can multiply the oscillator > frequency by 4 for internal use. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads