I have just written an x-y table lookup because I wanted to write the
3 (4) character day string to a similar display:
Charater is returned from (w*4)+counter.
This is easiest with binary length strings e.g. 2,4,8,16
Haven't thought about how to multiply by any other numbers.

day_table   movwf   temp        ;day number 0-6
            clrc
            rlf    temp,f      ;multiply by 2
            rlf    temp,w      ;multiply by 2
                               ;this takes us to the correct day
            addwf  counter,w   ;add char offset within day string 0-3
            addwf  pc,f

            dt  "Sun "
            dt  "Mon "
            dt  "Tue "
            dt  "Wed "
            dt  "Thu "
            dt  "Fri "
            dt  "Sat "
            dt  "Sun "

Write_day   clrf    counter

another     movlw   5           ;write "Fri " as an example.
            call    day_table
            call    write_to_LCD    ;character is now in w. print it.
            incf    counter,f
            movlw   4
            subwf   counter,w
            btfss   status,z
            goto    another_char

spin        goto    spin            ;that's it. done.



There you go. This is from memory of the code I wrote the other day
which worked very nicely. If there are any bugs then it's my memory
at fault.

/\/\att.