js06.asm

51单片机开发入门与典型实例

;程序:JS06.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  
           MOV   R2, #3    
           MOV   A, #00H   
   LOOP2:  MOV   P1, A     
              ACALL DELAY     
           CPL   A         
           DJNZ  R2,LOOP2  
           JMP   START     
   DELAY:  MOV  R5,#25   
   DLY1:   MOV  R6,#100    
   DLY2:   MOV  R7,#100    
           DJNZ R7,$                    
	   DJNZ R6,DLY2    
           DJNZ R5,DLY1    
	   RET            
           END