Port Allocations - Icom IC-2100H Service Manual

3-5
PORT ALLOCATIONS
3-5-1
CPU
(LOGIC UNIT
IC1)
Pin
number
Port
name
Description
1
TONEIN
nput
port for the
CTCSS
decode
sig-
nals.
9
RES
Input port
for
the reset
signal.
11
CK
Outputs
clock
signal
to
the
I/O
expander
ICs
(IC10,
MAIN
unit;
IC10),
PLL
1C
(MAIN
unit; IC1), etc.
12
DATA
Outputs data
signals
to
the
I/O
expander
ICs (IC10,
MAIN
unit;
IC10),
PLL
1C
(MAIN
unit;
IC1), etc.
13
ESCK
Outputs
clock signal
to
the
EEPROM
(IC7).
14
ESDA
I/O port for the
EEPROM
(IC7)
data
signals.
16
RD
Input port
for
the cloning
signal.
17
TD
Output
port for
the cloning
signal.
18
PWRSW
Input
for
the
POWER
switch.
Low
:
While
POWER
switch
is
pushed.
19,
20
DLCK,
DLUD
Input ports
for
up/down
signals from
main
dial.
22
EXSTB
Outputs
strobe signals
for
the
I/O
expander ICs
(IC10,
MAIN
unit;
IC10).
23 MICIN
Input port
for
microphone
serial sig-
nal via
the
buffer amplifier.
24
PLSTB
Outputs strobe signals
for
the
PLL
1C
(MAIN
unit; IC1).
25
E-TONE
Outputs 1750
Hz
Europe
tone
signal.
26
UNLK
Input port
for
PLL
unlock
signal
from
the
PLL
1C
(MAIN
unit;
IC1).
High
:
During unlock
33-35
COM3-
COM1
Output
LCD
drive signals.
36-39
KRO-
KR3
Input ports for
initial
matrix.
40
PWRON
Outputs
power
switching
circuit
con-
trol
signal.
High
;
While
turning
power ON.
41
COLOR
Outputs
color control signal
for display
backlight.
High
:
While
display
backlight
is
amber.
42,
43
DIMO,
DIM1
Outputs
brightness
control signal for
display
backlight.
44-75
SEG9-
SEG40
Output
LCD
drive signals.
77-88
SEG41-
SEG52
90
CTCSS
Outputs
CTCSS
signals.
91
DTMF
Outputs
DTMF
signals.
Pin
number
Port
name
Description
93
PIT
Input port
for the
PTT
switch.
High
:
While
PTT
switch
is
pushed.
94
EXTMIC
Input port to detect remote microphon
connection.
Low
:
HM-90/98
is
connected.
96
SQLV
Input port
for
squelch
setting
level sig-
nal.
97
SQL
Input port
for
squelch
level signal.
99
SMET
Input port
S-meter
level signal.
100
MICUD
Input ports
for
up/down
signals from
a
microphone.
3-5-2
I/O
expander
1C
(1)
IC10 (LOGIC
unit)
Pin
number
Port
name
Description
11
W/N
Outputs
receive/transmit
passband
width
control
signal.
High
:
While narrow bandwidth
is
selected. ([EUR],
[ITA] only)
12
MMUTE
Outputs
MIC
mute
control signal.
High
:
While
DTMF
signals are
out-
put, etc.
13
AMUTE
Outputs
AF
mute
switch
(MAIN
unit;
Q28)
control signal.
High
:
While squelched.
14
RMUTE
Outputs
detector
mute
switch
(MAIN
unit;
Q25)
control signal.
High
:
While squelched.
(2)
IC10
(MAIN
unit)
Pin
number
Port
name
Description
4
TX
Outputs
the
T8V
regulator
(Q11,
Q12)
control signal.
Low
:
While
transmitting
Output
RF
power
control signals.
5,
6
7
LP1,
LP2
RF
power
High Mid
Low
LP1 L L H
LP2
L H
L
SHIFT
Outputs
TX-VCO/RX-VCO
select
sig-
nal.
14
RX
High
:
While
transmitting
Outputs the
R8V
regulator
(Q29,
Q30)
control signal.
Low
:
While
receiving
3-4
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