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BCD to 7 Segment Code Conversion

May 4, 2011 by ProjectsGeek Leave a Comment

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.
Step IV    :    Compute 7 segment code using XLAT
                      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

 

Other Projects to Try:

  1. Add 8 Bit BCD Numbers
  2. Hex to BCD Conversion in Assembly Language Code
  3. BCD to decimal Conversion in Assembly Language
  4. Assembly Language Codes
  5. Add Two 16 Bit BCD Numbers Code

Filed Under: Assembly Codes Tagged With: Assembly Codes

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