Port Allocations - Icom IC-2000 Service Manual

3-5
PORT ALLOCATIONS
3-5-1
CPU
(LOGIC UNIT
IC2)
PIN
NUMBER
PORT
NAME
SIGNAL
NAME
DESCRIPTION
2
ANO
MIC
UD
Input port for
the [UP]/[DN]
switch
on
the
microphone.
3
AN1 PTT
Input port for
the [PTT] switch.
"High":
PTT
is
pushed.
4
AN2
S/RF
Input port
for
the
S/RF meter
signal.
5
AN3 SQL
Input port for
the noise
squelch
signal
from
the
FM
IF
1C
(MAIN
unit IC4).
"Low": squelch open.
8
OSC
—
Terminals
for
the
CPU
clock.
9
OSC2
10
RESET RESET
Input port
for
the
CPU
reset
signal.
14
DO
13/
DTSTB
Outputs a strobe
signal to
an
optional
UT-101
DTMF
UNIT.
15
D1
TOSTB
Outputs a strobe signal to
an
optional
UT-85
TONE
SQUELCH
UNIT.
16
D2 EXSTB
Outputs a strobe
signal to
the
expander
1C
(MAIN
unit IC9).
17
D3
MREMO
Outputs a mic audio
mute
signal to lead
DTMF
signals to
an
optional
UT-101
DTMF
UNIT
for
the
mic remote
function.
18
D4
ECK
Outputs clock signals to the
EEPROM
(ICS).
19
D5
EDATA
Serial
bus
line to
the
EEPROM
(ICS).
20 D6
STD
Input port for
the
decode
signal for
the
DTMF
decoder.
22 D8
DET
Input port
for
the
decode
signal for
the tone squelch.
23
D9
PWRSW
Input port
for
the
power
switch.
24 DIO/
STOPC
STOPC
Input port for
the stop
mode
cancel
signal.
25 Dll/
INTO
UNLK
Input port for the
PLL
unlock
signal.
"High": PLL unlocked
26
ROO/
INTI
BACK
UP
Input port
for
the
backup
signal to
save data before
power
is
turned
OFF.
27 R01/
INT2
DLCK
Input ports
for
the
channel
selector
from the
dial
28 R02/
INT3
DLUP
selector.
29 R03/
INT4
DLDN
30
RIO/
TOB
BEEP
Outputs a
beep
tone
signal.
PIN
NUMBER
PORT
NAME
SIGNAL
NAME
DESCRIPTION
32
R12/
TOD
DIMO
Outputs
LCD
backlight
intensity signals.
33 R13/
EVNB
DIM1
34 R20/
EVND
TOE
Outputs
port for
an enable
signal for
the
DTMF
encoder.
35 R21/
SCK
CK
Outputs a
serial
clock
signal.
36 R22/
SI
PWRON
Outputs a
power
control
signal to
the
power
switching
circuit
(MAIN
unit
Q38,
Q39).
37 R23/
SO
DATA
Outputs
serial data.
38
R30/
SEG1
K1/
TONE
Outputs a
strobe signal for the
key
matrix.
39 R31/
SEG2
K2/
TONE
40 R32/
SEG3
11/
TONE
Outputs a strobe signal
for
the
initial
matrix.
41
R33/
SEG4
12/
TONE
42—45
R40/
SEG5—
R43/
SEG8
KRO—
KR3
Input ports
for
the
initial
matrix
and key
matrix.
46—57
R50/
SEG9—
R73/
SEG20
SEG9—
SEG20
Output
LCD
drive
signals.
90—92
COM1
—
COM3
COM1
—
COM3
Output
LCD
drive
signals.
3-5-2
DATA EXPANDER
(MAIN UNIT
IC9)
PIN
NUMBER
PORT
NAME
DESCRIPTION
4
AMUT
Outputs an
AF
amplifier
mute
signal.
"High": amplifier
mute
5
LP1 Outputs a transmit
power
control
signal.
6
LP2
7
TX
Outputs a
T8V
control signal.
11
RMUTE
Outputs a receive
mute
signal.
"High": receiving mute.
12
RX
Outputs an
R8V
control signal.
14
MMUTE
Outputs a
microphone mute
signal.
"High": mic mute.
31
R11/
TOC
PLSTB
Outputs a strobe
signal to
the
PLL
1C.
(MAIN
unit
IC1)