> Have you read
>
> http://www.microchip.com/download/lit/suppdoc/errata/80073d.pdf
>
> It would seem there are some errors in the data sheet regarding
> EEPROM read/write - concerning the banks the registers are in

I read this a couple of days ago. Although I'm not totally sure I'm
on top of this yet, what I've found disagrees with Example 13-2

In that piece of code, setting up for a write, eeadr and eedata
are loaded AFTER the bank has been changed to bank1

BSF          STATUS,RP0
MOVLW   CONFIG_ADDR
MOVWF   EEADR
MOVLW   CONFIG_DATA
MOVWF   EEDATA

BSF          EECON1,WREN

In the routine I'm working on, that doesn't produce the correct
result because the data and address indices aren't in bank1

IMVHO, the errata sheet is misleading, or at least incomplete

If that's true, then it's a poor show. Microchip have these ICs
for a long long time before we get to play with them and the
documentation should be perfect. After all, these are digital
chips with entirely predictable behaviour

But I've a fresh batch of "hat sauce" simmering if that's not
the case, and someone can show me it's not

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