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4-6
PORT ALLOCATIONS
CPU
(LOGIC
UNIT)
Pin
number
Port
name
Description
2
REMOTE
Input port
for
remote
control signals
from an
optional
HM-75A
microphone
via
the
[EXT
MIC]
jack.
3
SD
Input port
for
detected
S-meter
signals
from
the IC101
(pin
12)
on
the
2F
unit.
4
CTCIN
Input port
for
received
CTCSS
tone
signals.
5
PCON
Output
port
for
+3C
regulator
circuit
control signals.
HIGH": Power
ON
6
PLST
Outputs
PLL
strobe
signals.
7
PLCK/ECK
Output
port
for
clock signals
to
PLL
and
EEPROM
ICs.
8
UL7PDA
DATA
bus
line for
PLL.
•
Outputs
PLL
DATA
when PLL
is
locked.
•
When
PLL
is
unlocked,
PLL
IC
releases the
port
being
pulled up,
therefore,
the
CPU
receives
"HIGH"
level signal.
9
CTCSS
Output
port
for
CTCSS
tone
signals.
10
DTMF
Output
port
for:
•
Beep
audio
signals while receiving.
•
DTMF
signals or
1750 Hz
tone
signal
while
transmitting.
(according
to
versions)
12
NOISE
Inputs
pulse
signals
for
noise
squelch from the
IC1 01
on
the
1
F
unit.
17
LOCK
Input port
for
the
[LOCK]
switch.
"LOW": [LOCK]
switch
is
ON.
21
DIUD
Inputs
up/down
signals
from
the
[DIAL]
control.
22
DICK
Input port
for
dial
clock
signals.
23
POWER
Input port
for
the
[POWER]
switch.
"LOW":
[POWER]
switch
is
pushed.
24
CONT
Outputs
LCD
contrast
control
signals.
28-31
KR3-KR0
Input ports
for
key
matrix.
32
PTT
Input port
for
the
PTT
control
circuit.
"HIGH":
When
transmitting.
Pin
number
Port
name
Description
33
RESET
Input port
for
reset
circuit
(LOGIC
unit
IC3).
39
CFC
Outputs
control signals
to
the
power
supply
of
the
CTCSS
bandpass
filter
(LOGIC
unit
Q45).
"LOW"
:
Activates the
BPF.
40
ESIO
DATA
bus
line
for
the
EEPROM
(LOGIC
unit
IC15) data
signals.
41
BLED
Outputs
[BUSY]
LED
control signals.
"HIGH"
:
The
LED
lights.
42
LIGHT
Outputs
LCD
backlight control
signals.
"HIGH"
:
The
backlight
lights.
43
Mice
Output
port
for
the
microphone
amplifier
(2F
unit
IC12).
"LOW"
:
Activates the
mic.
amp.
44
MM/RM
Outputs a
mute
signal.
[MM]
:
Microphone mute
for
DTMF
or
1750
Hz
tone
while
transmitting.
[RM]
:
Audio
mute
for
squelch
circuit
while
receiving.
"HIGH"
:
To mute one
of
above.
46
TXSEL
Outputs
transmit
frequency
band
control signals.
"HIGH"
:UHFband
"LOW"
:VHFband
47
HVCO
Output
port
for
the
UHF
band
VCO
(DUAL-VCO
board
0301
,
0302)
control signals.
"HIGH"
:
Activates the
UHF-VCO.
48
LVCO
Output
port
for
the
VHF
band
VCO
(DUAL-VCO
board
0304, 0305)
control signals.
"HIGH"
:
Activates the
VHF-VCO.
49
SHIFT
Output
port
for
SHIFT
signals
to
the
shift
switches
(1
F
unit
0354,
0854).
"HIGH"
:
Transmit on
VHF
"LOW"
:
Transmit
on
UHF
55
AFON
Outputs
control
signals
to
the
AF
regulator
circuit
(2F
unit
0151,
0152).
"HIGH"
:
Activates the
AF
amplifier.
56
H/L
Output
port
for
the
TX
output
power
(High or
Low)
select signals.
"LOW"
:
High
power
is
selected.
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