Sub Cpu Port Allocations - Icom IC-703 Service Manual

3-6-2 SUB CPU PORT ALLOCATIONS

(DISPLAY BOARD; IC6)
Pin Port
number name
Output key backlight control signals.
KL1S
2
3 KL2S
Input port for the phone plug insert
detecting signal.
4 PHNK
High : While the phone plug is insert-
RSK Input port for the [RIT/SUB] key.
5
Input port for the main dial's A phase
6 MDAK
signal.
Input port for the main dial's B phase
7 MDBK
signal.
Input port for the sub dial's A phase
8 SDAK
signal.
Outputs the "P.AMP" LED control sig-
16 PRED
nal.
17 ATTD Outputs the "ATT" LED control signal.
Outputs the "TUNER" LED control sig-
18 TUND
nal.
19 RITD Outputs the "RIT" LED control signal.
Outputs the "LOCK" LED control sig-
20 LCKD
nal.
RXD Outputs the "RX" LED control signal.
21
22 TXD Outputs the "TX" LED control signal.
Output the LCD backlight control sig-
nals.
BL1S
24 BL1S
25 BL2S
26 SUBD Outputs sub-dial's LED control signal.
29 WR
Output the LCD driver (IC2) control
30 RD
signals.
31 A0
COM4–
Output LCD common signals.
39–42
COM1
DB7–
44–50 I/O port for LCD driver's data signals.
DB0
SEG1–
51–82 Output LCD segment signals.
SEG32
Outputs the LCD driver reset signal.
LRES
83
Low : While the LCD driver is reset.
Input port for the communicating sig-
84 LRXD
nal with the main unit.
Description
KL1S KL2S Lights
Low Low OFF
High Low Low
High High High
ed.
BL2S Lights
Low Low OFF
High Low Low
High High High
(DISPLAY BOARD; IC6)–Continued
Pin Port
number name
85 LTXD
86 SDBK
PRAK/
88
TUNK
MENK/
89
F1K
90 F2K/F3K
DISK/
91
LCKK
MODK/
92
TSK
BUPK/
93
BDNK
94 PTTL
95 FUDL
AFGL
96
97 SQLL
99 SFTL
3 - 11
Description
Outputs the communicating signal with
the main unit.
Input port for the sub-dial's B phase
signal.
Input port for [P.AMP/ATT] and
[TUNER/CALL] keys.
Input port for [MENU] and [F-1] keys.
Input port for [F-2] and [F-3] keys.
Input port for [DISPLAY] and [LOCK]
keys.
Input port for [MODE] and [TS] keys.
Input port for [BAND UP] and
[BAND DN] keys.
Input port for the microphone PTT sig-
nal.
Input port for the microphone
UP/DOWN signal.
Input port for the AF volume control
signal.
Input port for the RS/SQL volume con-
trol signal.
input port for the SHIFT volume control
signal.