Written by Amol Shah, on Aug-2008

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This subroutine converts 8 bit Hexadecimal number into its equivalent BCD value. The number to be converted should be in the Accumulator. The output BCD number is stored in R0 & R1. R0 is used to save the MSB i.e. the hundreds place & R1 stores the LSB i.e. the Tens & Units place.

hextobcd:

                mov r0,#00h

                mov r1,#00h

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

                ret

c1_hextobcd:

                clr c

                mov b,#100                                //First divide by 100

                div ab

                mov r0,a                                     //save MSB in R0

                clr c

                mov a,b

                mov b,#10                                  //Divide by 10   

                div ab

                swap a

                mov r1,a                                     //save the tens place in the Higher nibble of R1

                mov a,b

                orl a,r1

                mov r1,a                                     // save the tens place in the Lower nibble of R1

                ret

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