Hi Adam,

The proper errata document IS NOT in the 18FXX20 page. Dont know the
reason... some brain damage around.
Anyway, go through the ERRATA DOCUMENT LIST
http://www.microchip.com/1010/suppdoc/errata/index.htm
 and get
PIC18FXX20 Rev. A3 Silicon/Data Sheet Errata
Page 1:
Module Core (Voltage vs Freq).
The device may not operate properly at frequecies exceeding 25MHz.....
Work around NONE....

Stefano Curtarolo



On Wed, 18 Sep 2002, M. Adam Davis wrote:

> It seems no one else responded (I thought someone else would chime in,
> so I didn't until now)
>
> I took a quick peek around the site again after reading this message,
> but can't find anything which would suggest this.
>
> Could you append links to the pages/documents that indicate this, and
> the inspection necessary to conclude this?
>
> You also suggest there is a workaround, would you spend some time
> elaborating?
>
> Thanks!
>
> -Adam
>
> Stefano wrote:
>
> >It seems that the 18FXX20 have been downgraded to 25MHz, due to some flash
> >memory speed concern.
> >Forntunately, since I do program in ASM, there is the workout, and full
> >40MHz can be achieved.
> >For C programs, since the used does not control the order of instruction,
> >the proper workout might be impossible..
> >
> >SC
> >
> >"information guessed by inspection of the Microchip website".
> >
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> >
> >
> >
> >
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