TIMER	EQU 01H
	ORG 000BH
	AJMP INT_T0
	ORG 0790H
 
START:	MOV SP,#53H
	MOV TMOD,#01H
	MOV TL0,#58H
	MOV TH0,#9EH
	MOV R0,#0H
	MOV TIMER,#20
	MOV SCON,#00H
	CLR TI
	CLR RI
	SETB TR0
	SETB ET0
	SETB EA
	SJMP $
 
INT_T0: PUSH ACC
	PUSH PSW
	CLR EA
	CLR TR0
	MOV TL0,#58H
	MOV TH0,#9EH
	SETB TR0
	DJNZ TIMER,EXIT
	MOV TIMER,#20
	MOV DPTR,#CDATA
	MOV A,R0
	MOVC A,@A+DPTR
	CLR TI
	CPL A
	MOV SBUF,A
	INC R0
	CJNE R0,#0AH,EXIT
	MOV R0,#0H
EXIT:	SETB EA
	POP PSW
	POP ACC
	RETI
CDATA:	DB 03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H
END