hi,
depends on requirements it may be done at more fast way. I mean the lookup table in which each byte is the segment`s image of the corresponded number. By this way, each number from 0 to 255 is collated to tree bytes which are segment images for first, second and third digits. They are placed into lookup table at addresses lookup+number, lookup+number+256 and lookup+number+512. Then you just need to read MOVC A,@A+DPTR for first digit, reload Acc , INC DPH for second one etc. Okay, it takes 768 bytes for segment image array but gives the speed, if need.

cu