This subroutine converts 8 bit Hexadecimal number into its equivalent ASCII value. The number to be converted should be in the Accumulator. The output ASCII number is stored in R0, R1 and R2. R0 contains the MSB i.e. the Hundreds place, R1 contains the Tens Place and R2 contains the LSB i.e. the Units Place.

The ASCII code for numbers 0-9 is 48-57 i.e. 30h – 39h

hextoascii:

                mov r0,#30h

                mov r1,#30h

                mov r2,#30h

                cjne a,#00h,c1_hextobcd             //check if number is 0 if not then continue

                ret

c1_hextobcd:

                clr c

                mov b,#100                        //divide by 100

                div ab

                orl a,r0

                mov r0,a                              //save 100^th place in R0

                clr c

                mov a,b

                mov b,#10                           //Divide by 10

                div ab

                orl a,r1

                mov r1,a                              //Save 10^th place in R1

                mov a,b

                orl a,r2

                mov r2,a                              //Save  units place in R2

                ret

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