LEDPIN BIT P3.5  ;your favorite port pin (LED preferred)

	ORG 00H
	JMP Z

        ORG 30H

Z:	CLR P3.3

	CLR P3.4
	CPL P3.4

BLINK:  CPL LEDPIN       ;toggle pin  (Great, if connected to a LED!)
        MOV R3,#4        ;wait for  TIME * 125 ms  (12 MHz)
        MOV R2,#0
        MOV R1,#0
LOOP:   DJNZ R1,LOOP
        DJNZ R2,LOOP
        DJNZ R3,LOOP
        SJMP BLINK       ;This is repeated forever,
                         ;if you don't press reset ...
        END