Z, why not use a 24/8 and ignore the result high byte

http://www.piclist.com/techref/microchip/math/div/24by8-jah.htm

;Unsigned 24 bit by 8 bit divide routine
;
; Inputs:
;   Dividend  - x,x+1,x+2 (x+2 - most significant!)
;   Divisor   - y
; Temporary:
;   Counter   - counter
; Output:
;   Quotient  - x,x+1,x+2 (x+2 - most significant!)
;   Remainder - x+3
-- 
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