> -----Original Message-----
> From: Jan-Erik Soderholm XA (TN/PAC)
> [SMTP:jan-erik.xa.soderholm@ERICSSON.COM]
> Sent: Monday, September 29, 2003 1:57 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: EEPROM refresh - what is it?
>
> Michael Rigby-Jones wrote :
>
> > > Yes, for some PICs, for other PICs they must be *non-written-at-all*
> > > (during run-time!) locations if they should be moved to program
> memory.
>
> >
> > I haven't checked but I don't recall seeing this warning in any
> datasheets
> > apart from the 18F series, which have flash memory anyway.
>
>
> I must be missing something here...
>
> If you are going to move a location from EEPROM to Flash
> that has to be written at runtime *at all*, it has to be on
> a PIC that support runtime writes to the Flash memory, not ?
>
Yes.  I presumed your comment about not writting at all at run time was a
roundabout way of saying you were using a PIC that did not support writting
to program memory.

> If your PIC doesn't support runtime writes to the Flash,
> you can not move any "less frequently written" locations
> there, or ?
>
> Most/all 18F parts does this, yes, but also *some* of the
> 16F parts such as all the 16F877 parts. This is not a
> differentiator beween the 18F series and "the others".
>
> And the warning is at least in the 12Fxxx data sheet
> (DS41190C) on page 49, section 8.5.1. Or what does
> you mean with "this warning" ?
>
I meant the note regrading refreshing the EEPROM memory if it was written to
frequently.  I was not aware of the 12F requiring this, but I certainly
couldn't remember seeing this note in the 16F87x datasheet.

Regards

Mike




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