Icom IC-F7000 Service Manual page 21

4-6-7 FRONT CPU PORT ALLOCATIONS (RC-26,
DISPLAY BOARD; IC8201)
Pin Port
number name
CS
15–17 WR Outputs LCD drive signals.
RD
Input port for the [CALL] switch.
21 CALK
Low: [CALL] switch is pushed.
Input port for the [∫] switch.
22 UPK
Low: [∫] switch is pushed.
Input port for the [√] switch.
23 UNK
Low: [√] switch is pushed.
24 SELA Input port for the select dial A signal.
25 SELB Input port for the select dial B signal.
Input port for the [POWER] switch
27 PCON detection signal.
Low: [POWER] switch is pushed.
28 IOK Input port for the [I/O] switch.
Input port for [∫], [√] switches from
31 MUDK
the microphone (HM-143).
Input port for the [PTT] switch from the
32 MPTT
microphone connector (J8701, pin 5).
Outputs LCD back light dimmer con-
trol signal.
Dimmer
37 DIM
ON
OFF
39 ETXD Outputs cloning data.
40 ERXD Input port for cloning data.
Input port for the [SCAN] switch
48 SCNK
Low: [SCAN] switch is pushed.
Input port for the [TUNE] switch
49 TUNK
Low: [TUNE] switch is pushed.
Input port for the [MUTE] switch
50 MUTK
Low: [MUTE] switch is pushed.
Input port for the [EMG] switch
51 EMGK
Low: [EMG] switch is pushed.
Input port for the [ ] switch
52 TRK
Low: [ ] switch is pushed.
Input port for the [ ] switch
53 TLK
Low: [ ] switch is pushed.
Input port for the [0] switch
54 T0K
Low: [0] switch is pushed.
Input port for the [9] switch.
55 T9K
Low: [9] switch is pushed.
Input port for the [8] switch.
57 T8K
Low: [8] switch is pushed.
Description
Brightness Voltage
0 (dark) 0 V
1 0.8 V
to to
10 (bright) 3.6 V
5.6 V
4 - 10
Pin Port
number name
Input port for the [7] switch.
58 T7K
Low: [7] switch is pushed.
Input port for the [6] switch.
59 T6K
Low: [6] switch is pushed.
Input port for the [5] switch.
60 T5K
Low: [5] switch is pushed.
Input port for the [4] switch.
61 T4K
Low: [4] switch is pushed.
Input port for the [3] switch.
62 T3K
Low: [3] switch is pushed.
Input port for the [2] switch.
63 T2K
Low: [2] switch is pushed.
Input port for the [1] switch.
64 T1K
Low: [1] switch is pushed.
I/O ports for LCD driver control sig-
65–72 DB0–DB7
nals.
Outputs resistor select signal for the
LCD driver.
74 RS
High: Index resistor is selected.
Low: Data resistor is selected.
Outputs reset signal for the LCD driver.
75 RES
Low: The LCD driver is reseted.
Outputs mic gain select signal.
High: Capacitor
76 MSEL
Low: Moving-conductor microphone
Outputs microphone key back light
77 MBKS control signal.
Low: Lights ON.
Description
microphone
selected.
is selected.
is