> That's actually from an 18F datasheet

Ah, I see it, section 6.4. Seems a little late in the piece for
MC to be saying that. I've checked in the 877 manual in case
it was something to do with being able to R/W Flash as well
but no

> I'm assuming that this is because the EEDATA/EEADR
>registers are simply non-functional

There might be an alternative interpretation of

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

_could_ mean that once the write has been initiated, the contents
of the registers have been passed on to the h/w for writing and so
that's what will be written. IOW, too late to change them. Perhaps
it's just sloppy writing, notwithstanding your observations

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