lesson7-1.asm

单片机实验

        
       ORG   0000H
        LJMP  LED
        ORG   0003H
        LJMP  ZDFW
LED:    MOV  P2,#0FEH
        MOV  R0,P0
       MOV  R1 , #06H
NEXT:  MOV A,R0
       MOV DPTR,#30H
	MOVC A,@A+DPTR
	MOV P1,A
	MOV A,P2
	RL A
	MOV P2, A
	LCALL DELAY
	DJNZ R6 , NEXT
	SJMP LED
DELAY : MOV R7,#2
DE0:   MOV R6,#200
DE1:   DJNZ R6,DE1
       DJNZ R7,DE0
	 RET

	    
        MOV A,#0A0H  
        MOV  R0 ,A
        MOV  R2, #08H
        SETB  IT1
        SETB  EA
        SETB  EX1
        MOV  DPTR,#0FEF0H
        MOV A,#00H
LOOP :  MOVX  @DPTR ,A
HERE :  SJMP  HERE
ZDFW :  MOVX  A,@DPTR
        MOVX   @R0, A
        INC  DPTR
	INC  R0
	RETI

      END