Marceli 0 Newbie Poster

Hi, I am looking to find 3 and 5 digit characters convert into hex byte or word. For example 69 string represents 69 decimal and 45 hex. Then '6' = 36h and '9'= 39h.
43690 = AAAA example. I need done it in Freescale (motorola) assembly for my communication machine with human online.