>         ;------------------------------------------------------
>         ; Write data (in EEPARAM) to EEPROM location (in W)
>         ;------------------------------------------------------
> SetEEData:
>         bsf     STATUS,RP1      ; Bank 2
>         bcf     STATUS,RP0      ; Bank 2

Check out my DBANKIF and related macros in STD.INS.ASPIC at
http://www.embedinc.com/pic/.  What you are doing may be correct in this
instance (I didn't check), but is a bug waiting to happen if you get the
desired bank wrong.  Let the assembler figure this out.

>         movwf   EEADR
>         movf    EEPARAM,W       ; Data to be stored
>         movwf   EEDATA

You should be checking that the previous write completed by waiting for the
WR bit in EECON1 to be 0.  This could well be your problem.

The relevant section in the manual is only 3/4 of a page.  For the 16F87x
see section 4.3 "Writing to the EEPROM Data Memory" on page 43 of DS3029C.

>         bsf     STATUS,RP0      ; Bank 3
>         bcf     EECON1,EEPGD    ; Point to data memory
>         bsf     EECON1,WREN     ; Enable writes
>         bcf     INTCON,GIE      ; Disable interrupts (if enabled)
>         movlw   H'55'           ; Special seq
>         movwf   EECON2          ; ...
>         movlw   H'AA'           ; ...
>         movwf   EECON2          ; ...
>         bsf     EECON1,WR       ; Start write operation
>         bsf     INTCON,GIE      ; Enable interrupts (only if being used)
>         bcf     EECON1,WREN     ; Disable writes
>
>         bcf     STATUS,RP1      ; Reset to bank 0
>         bcf     STATUS,RP0      ;
>
> WaitEEWriteComplete:
>         btfss   PIR2,EEIF
>         goto    WaitEEWriteComplete
>
>         return


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