	       ORG 0000H
START:  
           SETB P1.0             
           LCALL DELAY        
           CLR P1.0              
           LCALL DELAY
           LJMP START          
DELAY:     MOV R5,#2000   
D1:        MOV R6,#20
D2:        MOV R7,#250
           DJNZ R7,$
           DJNZ R6,D2
           DJNZ R5,D1
           RET                  
           END
