Port Allocations - Icom IC-V8 Service Manual

4-6 PORT ALLOCATIONS

4-6-1 CPU (IC8)
Pin Port
number name
Input port for the clock signal from the
1 DICK
[DIAL] (S801).
9 RESET Input port for reset signal.
Outputs reference oscillator for the
11 CSIFT
CPU control signal.
Outputs serial clock signal to the PLL
SCK IC (IC1, pin 2), D/A convertor IC (IC10,
12
pin 7) and optional unit.
Outputs serial signals to the PLL IC
14 SO (IC1, pin 3), D/A convertor IC (IC10,
pin 8) and optional unit.
16 CLIN Input port for the cloning signal.
17 CLOUT Outputs the cloning signal.
Input port for noise signals (pulse
19 NOIS
type).
Input port for the power switch.
21 S1 Low : While
OPV1– I/O ports for optional unit detection
23–25
OPV3 signals from/to J5.
26 CONT Outputs LCD contrast control signal.
Input port for the bias signals for the
28–30 V3–V1
LCD.
COM4–
Outputs LCD common signals.
32–35
COM1
KR3– Input port for initial matrix.
44–47
KR0 Low : While keys are pushing.
Input port for PLL unlock signal from
48 UNLK the PLL IC (IC1, pin 14).
Low : During lock.
• Outputs RX mute control signal.
49 RMUT • Input port for the RX mute signal
from the optional unit.
• Outputs TX mute control signal.
50 MMUT • Input port for the TX mute signal
from the optional unit.
Outputs low-pass filter cut-off frequen-
51 DUSE cy control signal when DTCS is acti-
vated.
Outputs SW5 regulator (Q55, Q57,
52 PCON Q39) control signal.
Low : While power is ON.
Outputs R5 regulator (Q21) control
53 R5C signal.
Low : While receiving.
Outputs T5 regulator (Q22) control
54 T5C signal.
Low : While transmitting.
Outputs APC circuit (Q37, IC3) control
55 TXC signal.
High : While transmitting.
Description
POWER switch
pushed.
Pin Port
number name
56 AFON
57 LIGT
58 ESCK
59 ESDA
60 DAST
61 PLST
62 PSVCO
is
63 PS5C
SEG1–
64–87
SEG23
90 CTCC
91 TONE
94 CTCIN
95 PTT
96 DIUD
97 REMO
98 SD
99 LVIN
100 TEMP
4 - 4
Description
Outputs control signal for the regulator
circuit of AF power amplifier.
High : When squelch is open, etc.
Outputs LCD backlight control signal.
High : Lights ON.
Outputs EEPROM (IC7, pin 6) clock
signal.
I/O port for the data signals from/to the
EEPROM (IC7, pin 5).
I/O port for strobe signals from/to the
D/A convertor IC (IC10, pin 6).
Outputs strobe signals to the PLL IC
(IC1, pin 4).
Outputs VCO5 regulator (Q11) control
signal.
Low : While power is ON.
Outputs PS5 regulator (Q54) control
signal.
Low : While power is ON.
Output LCD driver signals.
Outputs CTCSS and DTCS tone sig-
nal.
Outputs DTMF, BEEP and 1750 Hz
tone signal.
Input port for CTCSS and DTCS
decoded signals.
Input port for the [PTT] switch.
High : While [PTT] switch is pushed.
Input port for the UP/DOWN signal
from the [DIAL] (S801).
Input port for the remote signals from
an optional microphone (HM-75A) via
the [MIC] jack.
Input port for the RSSI detection.
Input port for the PLL lock voltage.
Input port for the transceiver's internal
tempareture detection.