START3:
MOV 	TMOD,#22H				
MOV 	TH1,#0FDH
MOV 	TH0,#0A0H				
MOV 	IE,#10XXXX1XB
MOV 	IP,#2						
MOV 	SP,#0CAH
MOV 	7EH, #DATA2				
MOV 	7FH, #0					
SETB 	TR0						
SJMP 	$						
T0SV:
PUSH 	ACC
PUSH  	PSW
PUSH  	0
MOV   	R0,7EH					
MOV   	A,7FH
CJNE  	A, #10,$+5
SJMP  	SND10
JNZ   	SND9
SND0:
CLR 	P1.0						
SJMP  	SVCOM
SND9:
CJNE 	A, #9,SND18
SETB  	P1.0						
MOV   	7FH, #0
INC   	7EH						
CJNE 	@R0, #0AH,SVCOM1
MOV  	7FH, #10
SJMP  	SVCOM1
SND10:
SETB 	7EH						
SND11:
CLR  	TR0
MOV  	7FH, #0
MOV  	7EH, #DATA2
SJMP 	SVCOM1
SENDER:
SETB 	7DH
SJMP  	SND11					
SND18:
JNC 		SENDER
MOV  	A,@R0
MOV  	C,ACC.0
MOV  	P1.0,C				
RR   	A
MOV 	@R0,A
MOV  	7EH,R0					
SVCOM:
INC 		7FH						
SVCOM1:
POP 		0
POP  	PSW
POP		ACC
RETI