BCD to 7 segment code conversion
BCD to 7 segment code conversion Algorithm
Step I : Initialize the data segment.
Step II : Load the offset of look up table in BX.
Step III : Load AL with key i.e. digit whose 7
segment code is to be found.
segment code is to be found.
Step IV : Compute 7 segment code using XLAT
instruction.
instruction.
Step V : Display the result.
Step VI : Stop.
BCD to 7 segment code conversion Code
.model small .data lookup db 01h, 04h, 1Ah, 09h, 02H key db 02h .code mov ax, @data ; Initialize data section mov ds, ax mov bx, offset lookup ; Load offset of lookup in bx mov al, key ; key no. in al xlat ; translate byte in al mov bh, al ; al = lookup(key) mov ch, 02h ; Count of digits to be displayed mov cl, 04h ; Count to roll by 4 bits l2: rol bh, cl ; roll bl so that msb comes to lsb mov dl, bh ; load dl with data to be displayed and dl, 0fH ; get only lsb cmp dl, 09 ; check if digit is 0-9 or letter A-F jbe l4 add dl, 07 ; if letter add 37H else only add 30H l4: add dl, 30H mov ah, 02 ; Function 2 under INT 21H (Display character) int 21H dec ch ; Decrement Count jnz l2 mov ah, 4cH ; Terminate Program int 21H end
Leave a Reply