Paul, there are conversion routines here

http://www.piclist.com/techref/microchip/math/radix/index.htm

to convert the counter contents to ASCII for the LCD

For a single byte you might try a simple /10 + remainder

         movf    counter,w ;copy
         movwf   temp
         clrf    dg_lo     ;clear destination
         clrf    dg_hi

loop     movlw   0x0a
         subwf   temp      ;subtract 10
         incf    dg_hi     ;increment 10's
         bc      loop      ;loop if temp > FF (-1)

         decf    dg_hi     ;else reduce 10's count
         addwf   temp,w    ;add back the 10
         movwf   dg_lo     ;store remainder (units)

         movlw   0x30      ;convert to ASCII
         iorwf   dg_lo
         iorwf   dg_hi

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