ORG	0
 	LJMP	MAIN
 	ORG 	03
 	LJMP	ISR_EX0      		
 	ORG 	100H
MAIN:	MOV 	IE,#81H	
	SETB	TCON.1   	
	MOV	TMOD,#20H
	MOV 	SCON,#50H
	MOV 	TH1,#-3   
	SETB	TR1
	MOV 	R0,#10 	
	MOV 	A,#2FH 	
	MOVX	@R0,A 	
	MOV 	R0,#11 	
   	MOV 	A,#83H  	
   	ACALL DELAY
   	MOVX	@R0,A  	
   	ACALL DELAY
	MOV 	R0,#0  	
   	MOV	A,#55H 	
	MOVX	@R0,A  	
 	MOV 	R0,#02  	
	MOV 	A,#56H 	
   	MOVX	@R0,A  	
   	MOV 	R0,#04	
	MOV 	A,#16H 	
   	MOVX	@R0,A  	
   	ACALL DELAY
   	MOV	R0,#11 	
	MOV 	A,#43H  	
   	MOVX	@R0,A  	
OV1:	MOV	A,#20H	
	ACALL SERIAL	
	MOV  	R0,#4  	
	MOVX 	A,@R0  	
	ACALL DISPLAY
	MOV	A,#20H	
	ACALL SERIAL	
	MOV	R0,#2    	
	MOVX	A,@R0  	
	ACALL DISPLAY	
	MOV	A,#20H	
	ACALL SERIAL	
	MOV 	R0,#0    	
	MOVX 	A,@R0  	
	ACALL DISPLAY		
	MOV	A,#0AH	
	ACALL SERIAL	
	MOV	A,#0DH	
	ACALL SERIAL	
	SJMP	OV1		
DELAY:
	MOV 	R7,#250
D1:	DJNZ 	R7,D1
    RET
DISPLAY:
	MOV 	B,A
	SWAP 	A
	ANL 	A,#0FH
	ORL 	A,#30H
	ACALL SERIAL
	MOV 	A,B
	ANL 	A,#0FH
	ORL 	A,#30H
	ACALL SERIAL
	RET
SERIAL:
	CLR	IE.7		
	MOV 	SBUF,A
S1:	JNB 	TI,S1
	CLR 	TI
	SETB	IE.7  	
	RET
	ORG 500H
ISR_EX0:
	MOV 	R0,#12 	
	ACALL DELAY
	MOVX	A,@R0 	
				
	MOV 	A,#'H'
	ACALL SERIAL
	MOV 	A,#'E'
	ACALL SERIAL
	MOV 	A,#'L'
	ACALL SERIAL
	MOV 	A,#'L'
	ACALL SERIAL
	MOV 	A,#'O'
	ACALL SERIAL
	RETI