Thanks Mike, I guess I should have figured it out for myself! Although after re-checking the devices, I see that I have one XT & one LP. I'll do something else with them and order the "HS" that I need as well as some "RC" to play with. Jeff ---------- > From: Mike Keitz > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: Configuration bits on 16c54 > Date: Wednesday, March 04, 1998 7:47 PM > > On Wed, 4 Mar 1998 18:41:19 -0800 JScholz writes: > >Hi All, > >I recently received two 16c54s with an order from Digikey. Each one > >had some of the configuration bits set according to my Picstart Plus. > >(firmware ver 1.2 I think). I will have to send them back. > > > >Has anyone else experienced this problem? Am I doing something > >wrong? The chips are marked: > > > > PIC16C54-XT/P and PIC16C54-XT/P > > 9713CAW 9711CAW > > The -XT chips come from the factory with the oscillator configuration > bits already set for XT mode (naturally). So don't send them back, they > are exactly what you asked for. The other bits should be unprogrammed. > Microchip used to set the oscillator bits as part of the final test. In > later PICs, this appears to have become unnecessary so they are shipped > unprogrammed. These PICs can be set to any oscillator type (subject to > the speed rating). > > Since the RC oscillator mode has both oscillator bits unprogrammed, order > -RC parts for complete blankness. You can set the oscillator to the mode > desired, possibly saving a little money over buying one set for XT or HS. > However, since the chip wasn't tested in these modes, Microchip won't > guarantee that they will work in any mode other than RC. Experience > shows that they do. > > _____________________________________________________________________ > You don't need to buy Internet access to use free Internet e-mail. > Get completely free e-mail from Juno at http://www.juno.com > Or call Juno at (800) 654-JUNO [654-5866]