        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