> -----Original Message-----
> From: Herbert Graf [SMTP:mailinglist@FARCITE.NET]
> Sent: Tuesday, March 11, 2003 10:11 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC] Help troubleshooting a F84 cct with dmm
>
> > FWIW, I am using it in HS mode.. that is correct isn't it? or
> > should I be in XT mode?
>
>         It SHOULD be XT for a 4MHz crystal, I'm not sure what would happen
> in HS
> mode, you might damage the crystal, or result in no oscillation. I'm not
> familiar enough to know, it's possible it would just work, with higher
> power
> consumption.
>         Please though, READ THE DATASHEET, this is VERY CLEAR in the
> datasheet and
> if you haven't perused the datasheet properly you are wasting our time.
> Sorry to be so harsh, but a PIC is something you NEED to consult the
> datasheet for. I've been working with PICs on a hobby level for a few
> years
> and STILL have to regularly consult the datasheet. TTYL
>
It will almost certainly still work with the HS setting.  Long term
reliability may be slightly compromised, and the oscillator may not be
exactly on frequency if it is being overdriven.  FWIW I've had to use the HS
setting when using certain 4MHz ceramic resonators with built in caps that
simply wouldn't start reliably using the XT fuse setting.

Mike


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