ORG 	00H
LJMP 	START
ORG 	0BH
LJMP 	COUNTER 
ORG 	30H
MOV 	SP,#50H						
MOV 	A,TMOD
ANL 	A,#11110000B
ORL 	A,#00001001B					
MOV 	TMOD,A
MOV 	TH0,#(65536-10000)/256			
MOV 	TL0,#(65536-10000).MOD.256
CLR 	TF0
SETB 	IE.1
SETB 	IE.7
SETB 	TR0
MOV 	A,#0FEH						
MOV 	P0,A
MOV 	R0,50						
L1:
NOP
JMP		L1
COUNTER:
CLR		IE.1
MOV 	TH0,#(65536-10000)/256			
MOV 	TL0,#(65536-10000).MOD.256
DJNZ 	R0,L2
RR 		A
MOV	P0,A							
MOV	R0,50
SETB 	IE.1
RETI
END