ORG 0003H ;STANDARD EXTERNAL INTERRUPT INT0 ENTRY POINT
EXTINT0:
	CLR EA	    ;DISABLE GLOBAL INTERRUPT BIT
	MOV A,P0    ;MOV 8 BIT DIGITAL VALUE FROM ADC TO ACC  
	SETB P3.7   ;HIGH TO LOW TRANSITION TO CLR INTERRUPT LINE AND ENABLE OUTPUT LATCHES
	CLR P3.7    ;NOTE: P3.7 = RD PIN ON 8051
	MOV R5,#0FFH			      
RETI