数字显示.asm

单片机0到99编程 真的很不错

ORG 000H
AJMP MAIN
ORG 0003H
CLR EX0
RETI
ORG 000BH
CLR ET0
RETI
ORG 0013H
CLR EX1
RETI
ORG 001BH
CLR ET1
RETI
ORG 0023H
RETI
   MAIN:MOV 50H,#11
        MOV 51H,#7
        MOV 52H,#1
        mov R1,#0
        DSPBUF EQU 50H;..52H
        PDSPSEG EQU P0
        PDSPPCS EQU P2
        ACALL DISPLAY
        SJMP MAIN
        ret
DISPLAY:MOV R2,#01111111B
        MOV R0,#DSPBUF
    LP0:MOV A,@R0
        MOV DPTR,#DSPTAB
        MOVC A,@A+DPTR
        MOV PDSPSEG,A
        MOV PDSPPCS,R2
        ACALL DELAY
        MOV A,R2
        rr A
        MOV R2,A
        INC R0
        inc R1
        cjne R1,#255,LP1
        sJMP Lp2
    LP1:JB ACC.4,LP0
        AJMP DISPLAY
    LP2:MOV A,@R0
        MOV DPTR,#DSPTAB
        MOVC A,@A+DPTR
        MOV PDSPSEG,A
        MOV PDSPPCS,R2
        MOV R1,#0
        SJMP display
        RET
  DELAY:MOV R3,#4
     L1:MOV R4,#255
     L2:DJNZ R4,L2
        DJNZ R3,L1
        RET
 DSPTAB:DB 0C0H,0F9H,0A4H,0B0H,99H
        DB 92H,82H,0F8H,80H,90H
        db 88h,83h