Herbert Graf wrote:
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Matt Bonner
> > Sent: Monday, January 12, 1998 12:25
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: TTL clock question (and crystals)
> >
> >
> > Charles Laforge wrote:
> > > When using a TTL clock oscillator, what option should I use to program
> > > the device?  XT?  HS?  I couldn't find this mentioned anywhere.
> >
> > If you're using an external oscillator, you can program the device using
> > any mode since the fuse just sets the value of the crystal feedback
> > resistor (which is not being used).  For lower power, use LP.
>
>         I believe you have to change that from "any mode" to "any mode but
 RC". I
> don't think you can use an external oscillator with the fuse set to RC. TTYL

You're right.  I keep forgetting about the RC mode because I can't use
it at the temperature extremes my product has to operate in.
--Matt