Icom IC-775 - Page 23

4-5-3
SUB CPU
PORT
ALLOCATIONS
(SW-A
UNIT ICS)
Pin
number
Port name
Description
1
KSAD
Input
port
for the
(PC3)
[KEY SPEED]
control.
12,
13
MDUP,
MDDN Input
ports for up/down
signal
(P21
,
P22)
of the
main dial.
14,
15
SDUP,
SDDN Input
ports for up/down
signal
(P23, P24)
of
the sub dial.
32
KD
(PA3)
Input
port for key down
signal.
33
EKEY
Outputs
a keying signal to
the
(PA2)
internal
keyer.
34
DASH
Input
port
for
DASH signal of
(PA1)
the paddle.
35
DOT
Input
port
for
DOT signal of
(PAO)
the
paddle.
36-^3 KR0-KR7 Input
ports for return
signals of
(P57-P50)
the key
matrix.
44-51
KS0-KS7
Output
strobe signals for the
(P67-P60)
key matrix.
67
BRIG
Outputs a
dimmer control
(P87)
signal for backlighting.
77,
78
RDUP,
RDDN Input
ports for up/down
signal
(P10, P11)
of the [RIT/JTX]
dial.
79
SDAT
Input port for
rapid rotation of
(PI
2)
the sub
dial.
80
MDAT
Input port
for rapid rotation of
(PI
3)
the
main dial.
82 SDCK
Input port for clock
signal of
(PI
5)
the sub dial.
83
MDCK
Input port for
clock signal of
(PI
6)
the
main dial.
84
RDCK
Input port for clock
signal of
(PI
7)
the [RIT/ZITX]
dial.
90
MAD
Input
port for selection
voltage
(PBO)
of the
[METER] switch.
91
PRAD
Input port for
selection voltage
(PB1)
of the [PREAMP/ATT]
switch.
95
PB1V
Input port for
the 455 kHz
(PBS)
[PBT] control.
96
PB2V Input
port for the
9
MHz
[PBT]
(PB6)
control.
97 NRAD
Input
port for the [NR LEVEL]
(PB7)
control.
98
BLAD
Input
port
for the
[BALANCE]
(PCO)
control.
99
PWAD
Input
port
for the
[PWR]
(PCI)
control.
100
READ
(PC2)
Input
port for the [RF]
control.
4-5-4
I/O
EXPANDER PORT
ALLOCATIONS
(1)
Output
ports (MAIN unit IC4)
Pin
number
Port name
Description
4
voxs Outputs a
control signal for the
(Q1)
VOX
circuit.
5
MINH Outputs an
Inhibit signal for the
(Q2)
microphone mute circuit
(Q25).
6
ALPS
Outputs
a
control signal for the
(Q3)
AF low-pass filter.
7
APFS
Outputs a control
signal for
the
(Q4)
audio peak filter.
12 FBKS
Outputs “Low”
while full break-in
(Q7)
is selected in CW mode.
13
BKIN
Outputs a control signal
for
the
(Q6)
break-ln circuit.
14
NBS Outputs a
control signal for the
(Q5)
noise blanker circuit.
(2)
Output ports
(IF unit
IC30)
Pin
number
Port
name
Description
4 NBWS
(Q1)
Outputs
a control signal
for
the
wide noise
blanker circuit.
5
PGDN
(Q2)
Outputs a
power down signal.
“High” during AM transmitting
and tuning an
antenna.
6
AGCR
(Q3)
Outputs a reset
signal for the
AGO
circuit. “High”
during
memory scan,
programmed scan
with [TS] ON and AGO
turned
OFF.
7
MONS
(Q4)
Outputs a
control signal for the
AF
selector (IC21). “High”
during SSB/CW/RTTY
mode
with monitor ON.
(3)
Output ports (IF
unit
IC31
)
Pin
number
Port name
Description
4-6
MTS1-
MTS3
(Q1-Q3)
Output
control signals for the
meter switch (IC6).
7,14,
13
AFS1-AFS3
(04-06)
Output
selection signals for the
AF signal.
11,
12 MOS1,
MOS2
(07, 08)
Output selection
signals for
the
modulation
signal.
4-12