h_6_1.asm.svn-base

单片机硬件实验代码

        COM_ADD   XDATA      0E003H
        PA_ADD    XDATA      0E000H
        PB_ADD    XDATA      0E001H
        PC_ADD    XDATA      0E002H
        ORG       0000H
        SJMP      START 
        ORG       0030H
        
 START: MOV       DPTR,#COM_ADD
        MOV       A,#90H
        MOVX      @DPTR,A

        MOV       R0,#0FEH
CYC_LIG:MOV       DPTR,#PA_ADD
        MOVX      A,@DPTR
        CJNE      A,#0FFH,SHOW
        MOV       A,R0
        MOV       DPTR,#PC_ADD
        MOVX      @DPTR,A
        ACALL     DELAY
        RL        A
        MOV       R0,A
        SJMP      CYC_LIG
        
 SHOW:  MOV       DPTR,#PA_ADD
        MOVX      A,@DPTR
        MOV       DPTR,#PC_ADD
        MOVX      @DPTR,A
        SJMP      CYC_LIG
        
 DELAY: MOV       R7,#0FFH
   _A:  MOV       R6,0
        DJNZ      R6,$
        DJNZ      R7,_A
        RET
                    
        END