led.asm

（原创）动态液晶显示

        DATA  SEGMENT
         LED  DB        14H,7AH,7BH,7AH,02H,7AH,4AH,7AH
              DB        04H,3CH,3CH,3CH,3CH,92H,0A5H,78H
              DB        7EH,08H,08H,08H,08H,08H,08H,0FFH
              DB        0F7H,92H,0F2H,0F7H,42H,0F7H,43H,0F2H
              DB        2AH,7FH,81H,3EH,18H,7FH,08H,0CH
              DB        27H,0FBH,7BH,03H,0FDH,37H,0B1H,0CFH
              DB        0FFH
       PORTB  DB        0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,7FH
   
        DATA  ENDS

        CODE  SEGMENT
              ASSUME    CS:CODE,DS:DATA
      START:  MOV       AX,DATA
              MOV       DS,AX
              MOV       AL,80H
              MOV       DX,223H
              OUT       DX,AL       ;init the 8255

              MOV       SI,OFFSET LED
              MOV       BX,500H
              JMP       MN
         KK:  ADD       SI,8
              MOV       AL,[SI]
              CMP       AL,0FFH
              JZ        EXIT
              MOV       BX,500H
              JMP       MN
      LWORD:  SUB       SI,8
         MN:  DEC       BX
              CMP       BX,0
              JZ        KK
              MOV       CL,0
              MOV       DI,OFFSET PORTB

       LROW:  MOV       AL,[SI]
              MOV       DX,220H
              OUT       DX,AL
              INC       SI
              MOV       AL,[DI]
              MOV       DX,221H
              OUT       DX,AL
              INC       DI
              PUSH      CX
              PUSH      BX
         ON:  MOV       BX,50
         LL:  MOV       CX,90
         LK:  LOOP      LK
              DEC       BX
              JNZ       LL
              POP       BX
              POP       CX
              INC       CL
              CMP       CL,8
              JE        LWORD
         MM:  MOV       AH,01H
              INT       16H
              JZ        LROW
    
       EXIT:  MOV       AH,4CH
              INT       21H
        CODE  ENDS
              END       START