js05.asm

51单片机开发入门与典型实例

;程序:JS05.ASM
   START:   MOV   R0, #8   
            MOV   A,#0FEH   
   LOOP:    MOV   P1, A   
            ACALL DELAY   
            RL    A       
	    DJNZ  R0, LOOP 
            MOV   R1, #8              
    LOOP1:  RR    A              
            MOV   P1, A   
            ACALL DELAY    
	    DJNZ  R1,LOOP1  
	    JMP   START     
    DELAY:  MOV  R5,#25    
    DLY1:   MOV  R6,#100  
    DLY2:   MOV  R7,#100 
            DJNZ R7,$                         
            DJNZ R6,DLY2  
	    DJNZ R5,DLY1
            RET              
	    END