ORG 0000H
LJMP MAIN
ORG 001BH
LJMP T1ISR
ORG 0030H
MAIN:
MOV TMOD,#20H
MOV TH1,#6
MOV TL1,#6
SETB TR1
SETB ET1
SETB EA
CLR A
SJMP $
T1ISR:
INC A
CJNE A,#20,T11
T11:
JNC T12
CJNE A,#60,T13
T13:
JC T14
CLR A
RETI
T12:
SETB P1.1
RETI
T14:
CLR P1.1
RETI
END
