This is one of MicroChips main failing.  Look at the 16F628.  It has been
out for a while and still says preliminary.

----- Original Message -----
From: "Hazelwood Lyle" <LHazelwood@MFGNC.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, August 05, 2002 2:36 PM
Subject: Re: [PIC]:Has any one ever got a PIC 18F244 chip to work at 40mhz


> OK, just for the record..
>
> RTFM should always be the first step. I try to, at least.
>
> Your posting and the ensuing discussion were valuable to me.
> I also purchased some 40MHZ XTals in anticipation
> of my recently arrived PIC18F parts. Had I not read your post,
> I would surely have fallen into the same predicament.
>
> This morning I read the manual(41159a.pdf), and while an
> explanation of the PLL feature was there, there was no
> statement that it is required. Granted, the tables show
> testing of resonators and crystals only up to 25MHZ, and
> only up to 10 with HS4 enabled.. But there was nothing
> that I read stating that you couldn't do regular HS at
> 40 MHZ.
>
> Also, the higher clock rates in the table were marked "TBD"
> or something similar.
>
> Perhaps I'm using a dated datasheet. I DL'ed the latest, sure
> enough, this was updated to 41159b.pdf. Still marked as
> "preliminary", but apparently the latest as I just got it from
> the Microchip website. The "Oscillator Options" are the same.
>
> Am I looking in the wrong place? In the wrong document?
> Is it just a Monday thing?
>
> Any feedback, corrective or otherwise, is welcomed.
> Lyle Hazelwood
>
>
> -----Original Message-----
> From: Josh Koffman [mailto:listsjosh@3MTMP.COM]
> Sent: Monday, August 05, 2002 1:29 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:Has any one ever got a PIC 18F244 chip to work at
> 40mhz
>
>
> Ok, admittedly I slipped on this one. I shouldn't have asked. Sorry all.
>
> 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:
> <snip>
>
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