ORG	0000H
LJMP	MAIN
MAIN:
MOV	DPTR,#0FEFFH
LP:
	MOV A,#0FFH
	MOVX @DPTR,A
	LCALL DELAY
	MOV A,#00H
	MOVX @DPTR,A
	LCALL DELAY
	SJMP LP
DELAY:
	CPL P1.1
	NOP
	NOP
	NOP
	MOV R3,#0FFH
	DJNZ R3,$
	RET

END