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Port
name
IS0–IS2
KS1, KS2
KR3–KR0
PTT
DI_SEC
TX_DIGI
SO
OPSCK
OPV1
DASTB
OPV2
EXTMIC
DUSE
ESCK
ESDA
OP_PS
THROUGH
ALC
OPT3
OPT2
OPT1
SEG1–
SEG36
COM4–
COM1
VL3–
VL1
IDET
4-5-3 CPU (LOGIC UNIT; IC1)
Pin
number
1
2
3
4
5
6
7
8
9
10
14
19
25
26
28
29
30
31
34
35
40
42
43
44
45
46
47
49
51
Port
name
CTCIN
SQLV
MICUD
SD
LVIN
TEMP
DET0
COLOR
DIM0
DIM1
CSHIFT
RESET
PWRSW
NOIS
DICK
DIUD
CLIN
CLOUT
SCK
BUSY
PWRON
BSHIFT
PLLSTB
PLLCK
EXSTB
OPV3
UNLK
REMO
MICS
AFON
Description
Input port for the CTCSS/DTCS sig-
nals.
Input port for squelch volume detect-
ing signal.
Input port for the [∫] and [√] switches
from the external microphone.
Input port for the S-meter voltage
detecting signal.
Input port for the PLL lock voltage.
Input port for the transceiver’s internal
temperature detecting signal.
Input port for the weather channel
alert detecting sinal.
Outputs LCD backlight color select
signal.
Low: Umber color is selected.
Output LCD backlight brightness con-
trols signals
Outputs the CPU clock shift control
signal.
Input port for the reset signal.
Input port for [POWER] switch.
Low: [POWER] switch is pushed.
Input port for the noise pulse signal for
squelch and CPU.
Input ports for encoder signals.
Input port for the cloning signal.
Output port for the cloning signal.
Outputs serial clock signal to the D/A
convertor (MAIN unit; IC5, pin 7).
Outputs “BUSY” signal to the UT-115.
Outputs [POWER] switch control sig-
nal.
High: [POWER] is ON.
Outputs band shift signal.
Low : While receiving Air band
(118–136 MHz).
Outputs strobe signal to the PLL IC
(MAIN unit; IC1, pin 4).
Outputs clock signal to the PLL IC
(MAIN unit; IC1, pin 2).
• Outputs strobe signal to the
expander IC (MAIN unit; IC2, pin 1).
• Input port for the optional unit detect-
ing signal.
Input port for the PLL unlock signal.
Input port for the HM-133V remote
microphone signals.
Output transmitting/receiving AF filter
select signal to the analog swtich (IC6,
pin 6 [“AFON” is applied to the
pin 12]).
Pin
number
53–55
56, 57
58–61
62
64
65
66
67
68
69
73
74
75
76
77
80
81
84
85
86
90,
92–127
128–131
134–136
144
Description
Output initial matrix strobe signals.
Output key scan signals
Input ports for the keyboard matrix
signals.
Input port for the [PTT] switch signal.
High: While transmitting.
Outputs digital/analog select signal
while the UT-115 is installed.
High : Digital is selected.
Outputs filter characteristic control sig-
nal while the UT-115 is installed.
Low : While transmitting digital sig-
nal.
• Outputs serial data to D/A convertor
(MAIN unit; IC5, pin 8).
• Outputs DTMF clock signal to the
expander IC (MAIN unit; IC2, pin 2).
Outputs clock signal to the optional
unit.
• Input port for the optional unit detect-
ing signal.
• Outputs strobe signal to the D/A con-
verter (MAIN unit; IC5, pin 6).
Input port for the optional unit detect-
ing signal.
Input port for detecting signal whether
the multifunction microphone is con-
nected or not.
Low: The multifuntion microphone is
connected.
Outputs low-pass filter cut-off frequen-
cy control signal when using DTCS.
Outputs clock signal to the EEPROM
(IC5, pin 6).
I/O port for data signals from/to the
EEPROM (IC5, pin 5).
Outputs the optional unit power supply
controll signal.
High : Power is ON.
Outputs the ALC circuit control signal.
High : The ALC circuit is OFF.
Outputs the ALC circuit control signal.
High : The ALC circuit is ON.
I/O ports for the optional unit control
signals.
Output LCD segment signals.
Output LCD common signals.
Output LCD device signals.
Input port for the current drain detect-
ing signal while transmitting.
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