On Mon, Nov 10, 2008 at 12:31 PM, Xiaofan Chen wrote: > On Mon, Nov 10, 2008 at 12:04 PM, Forrest W Christian > wrote: >> >> I have dug through the data sheets and errata and haven't found anything >> which indicates that this shouldn't work. What am I missing? Or does >> this just not work with a 25Mhz clock on a PIC18LF... > > Are you using 3.3V since you are using an LF version. If I remember > right, LF version of many PIC18Fs (like PIC18LF2550 and > PIC18LF2620) should not operate above 20MHz according > to the datasheet I mean for 3.3V operation, the maximum CPU frequency should not exceed about 20MHz. > It may run. It may not run since you > are running the chip out of spec. > > Xiaofan > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist