ORG 0000H
MAIN:  
CLR P1.0            
LCALL DELAY       
SETB P1.0             
LCALL DELAY
LJMP MAIN          
DELAY: 
MOV R6,#10
D1:MOV R5,#100
D2:MOV R4,#250
D3:
NOP
NOP
DJNZ R4,D3
DJNZ R5,D2
DJNZ R6,D1
RET                 
END
