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'[PIC] 18FXX20 downgrade to 25MHz'
2002\09\14@144848 by Stefano

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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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2002\09\18@022446 by M. Adam Davis

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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:

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2002\09\19@210335 by Stefano

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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
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:

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