P0       DATA  080H  ;PORT 0	
SP       DATA  081H  ;STACK POINTER	
DPL      DATA  082H  ;DATA POINTER - LOW BYTE
DPH      DATA  083H  ;DATA POINTER - HIGH BYTE
DPP      DATA  084H  ;DATA POINTER - PAGE BYTE
P1       DATA  090H  ;PORT 1
P2       DATA  0A0H  ;PORT 2
P3       DATA  0B0H  ;PORT 3
       
	ORG     0000H
        LJMP    START
        ORG     0100H
START:  MOV     SP,#60H
        MOV     P3,#0FFH
INOUT:  
        MOV     C,P3.2
	MOV 	P3.3,C
        ACALL	DELAY
        AJMP    INOUT
DELAY:
	NOP
	MOV	R6,#250
	NOP
	NOP
	DJNZ	R6,DELAY_1MS1
	RET
        END