On Thu, 26 Feb 2004, Jinx wrote:

> > Can an interrupt that occurs while waiting for write completion
> > attempt to read from EEPROM or read/write program memory?
>
> AFAIK no manual or EEPROM d/s specifically says you can't
> read EE whilst a write is occuring.

The datasheets say, "After a write sequence has been initiated,
EECON1, EEADR and EEDATA cannot be modified."

As the actual write on a micro
> is done in h/w on a single byte by a timer/charge pump and doesn't
> rely on or affect s/w, maybe you can read other locations during the
> ~4ms that the write takes. I've never tried that and unfortunately not
> able to at the moment

My question could have been worded better; I was asking whether the OP
was actually trying to do that, since it would be a problem.  You
can't read EEPROM or program memory while an EEPROM write is in
progress.

--
John W. Temples, III

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