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ORG 0000H
LJMP MAIN
ORG 000BH
LJMP T0ISR
ORG 0030H
MAIN:
MOV TMOD,#02H
MOV TH0,#246
MOV TL0,#246
SETB TR0
SETB ET0
SETB EA
SETB P1.0
CLR A
SJMP $
T0ISR:
INC A
CJNE A,#67,T01
T01:
JC T02
CLR P1.0
CJNE A,#200,T03
T03:
JC T0E
CLR A
T0E:
RETI
T02:
SETB P1.0
RETI
END