d0809.asm

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  ;显示缓冲区为40H~44H.
       SMG0  EQU  40H
       SMG1  EQU  41H
       SMG2  EQU  42H
       SMG3  EQU  43H
       SMG4  EQU  44H
       TEMP  EQU  60H
       FLAG  EQU  01H
       ORG   0000H
       AJMP  START
       ORG   0100H
START: MOV   SMG0,#10H
       MOV   SMG1,#10H
       MOV   SMG2,#10H
       MOV   SMG3,#10H
       MOV   SMG4,#10H

MAIN:  CLR   FLAG
       SETB   P3.4
MAIN1:  LCALL DELAY
         SETB  P3.3
       LCALL DISP
       LCALL AD0809
        MOV P1,A
        MOV B,A
        SWAP  A
        ANL A,#0FH
        LCALL ZH
        MOV SMG4,A
        MOV A,B
        ANL A,#0FH
        LCALL ZH
        MOV SMG3,A
        SWAP  A
        ORL  A,SMG4
        JB   FLAG,OK
        CJNE A,#70H,XYH

XYH:    JC   MAIN
        SETB FLAG
        CLR  P3.4
        AJMP MAIN1
OK:     CJNE A,#50H,XYG
XYG:    JNC  MAIN1
        AJMP MAIN

ZH:     JB    ACC.0,NEXT1
        MOV   50H,#00H
BB1:    JB    ACC.1,NEXT2
        MOV   51H,#00H
BB2:    JB    ACC.2,NEXT3
        MOV   52H,#00H
BB3:    JB    ACC.3,NEXT4
        MOV   53H,#00H
        AJMP  ADDA
NEXT1:  MOV   50H,#08H
        AJMP  BB1
NEXT2:  MOV   51H,#04H
        AJMP  BB2
NEXT3:  MOV   52H,#02H
        AJMP  BB3
NEXT4:  MOV   53H,#01H
ADDA:   MOV   A,53H
        ADDC  A,52H
        ADDC  A,51H
        ADDC  A,50H
        RET

AD0809: MOV  DPTR,#0FEF3H
        MOVX  @DPTR,A
HERE:   JB  P3.3,HERE
        MOVX  A,@DPTR
        RET

DELAY:  MOV R7,#0
DLY:    MOV R6,#0
AA1:    DJNZ R6,AA1
        DJNZ R7,DLY
        RET

DISP:  MOV    R0,#SMG0
       MOV    R1,#TEMP
       MOV    R2,#5
DP10:  MOV    DPTR,#SEG
       MOV    A,@R0
       MOVC   A,@A+DPTR
       MOV    @R1,A
       INC    R0
       INC    R1
       DJNZ   R2,DP10
       MOV    R0,#TEMP
       MOV    R1,#5
DP12:  MOV    R2,#8
       MOV    A,@R0
DP13:  RLC    A
       MOV    P3.0,C
       NOP
       CLR    P3.1
       SETB   P3.1
       DJNZ   R2,DP13
       INC    R0
       DJNZ   R1,DP12
       RET

SEG:  DB  3FH,06H,5BH,4FH,66H,6DH,7DH
      DB  07H,7FH,6FH,77H,7CH,39H,5EH
      DB  79H,71H,00H

      END