led广告.asm

这是“led广告屏”程序

        ORG 0000H
        
        MOV DPTR,#0E100H
        MOV A,#03H
        MOVX @DPTR,A
        
        MOV R4,#08H
        MOV P2,#0A0H
        MOV R1,#00H
        MOV A,#00H
        MOVX @R1,A
        
RD_DISP:
        MOV R3,#01H
        MOV R2,#00H
        
RDISP1: MOV A,#00H
        MOVX @R1,A
        MOV A,R3
        ACALL SEND164
        MOV A,R2
        MOV DPTR,#DIS_CODE
        MOVC A,@A+DPTR
        MOVX @R1,A
        ACALL DELAYT
        
        INC R2
        MOV A,R3
        RL A
        MOV R3,A
        DJNZ R4,RDISP1
        SJMP RD_DISP
        
        
        
SEND164:MOV 74H,#8
        MOV R5,A
SEND_RE:MOV A,R5
        RL A
        MOV R5,A
        ANL A,#0FDH
        MOV DPTR,#0E102H
        MOVX @DPTR,A
        ORL A,#02H
        MOVX @DPTR,A
        ANL A,#0FDH
        MOVX @DPTR,A
        DJNZ 74H,SEND_RE
        RET
        
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

DELAYT:MOV R7,#02H
DLY1: MOV R6,#0
DLY2: DJNZ R6,DLY2
      DJNZ R7,DLY1
      RET
      
DIS_CODE: DB 10H,0FEH,92H,0FEH,92H,0FEH,11H,1FH 
DIS_CODE1:DB 0FFH,0FFH,18H,18H,18H,18H,0FFH,0FFH