> 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. 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

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