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4-6-7 FRONT CPU PORT ALLOCATIONS (RC-26,
DISPLAY BOARD; IC8201)
Port
Pin
name
number
CS
WR
15–17
Outputs LCD drive signals.
RD
Input port for the [CALL] switch.
CALK
21
Low: [CALL] switch is pushed.
Input port for the [Y] switch.
UPK
22
Low: [Y] switch is pushed.
Input port for the [Z] switch.
UNK
23
Low: [Z] switch is pushed.
SELA
24
Input port for the select dial A signal.
SELB
25
Input port for the select dial B signal.
Input port for the [POWER] switch
PCON
27
detection signal.
Low: [POWER] switch is pushed.
IOK
28
Input port for the [I/O] switch.
Input port for [Y], [Z] switches from
MUDK
31
the microphone (HM-155).
Input port for the [PTT] switch from
MPTT
32
the microphone connector (J8701, pin
5).
Outputs LCD back light dimmer
control signal.
Dimmer
DIM
37
ON
OFF
Outputs cloning data.
ETXD
39
Input port for cloning data.
ERXD
40
Input port for the [SCAN] switch
SCNK
Low: [SCAN] switch is pushed.
48
Input port for the [TUNE] switch
TUNK
49
Low: [TUNE] switch is pushed.
Input port for the [MUTE] switch
MUTK
50
Low: [MUTE] switch is pushed.
Input port for the [EMG] switch
EMGK
Low: [EMG] switch is pushed.
51
Input port for the [←] switch
TRK
52
Low: [←] switch is pushed.
Input port for the [→] switch
TLK
53
Low: [→] switch is pushed.
Input port for the [0] switch
T0K
54
Low: [0] switch is pushed.
Input port for the [9] switch.
T9K
55
Low: [9] switch is pushed.
Input port for the [8] switch.
T8K
57
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
Pin
Port
number
name
58
T7K
59
T6K
60
T5K
61
T4K
62
T3K
63
T2K
64
T1K
65–72
DB0–DB7
74
RS
75
RES
76
MSEL
77
MBKS
4 - 9
Description
Input port for the [7] switch.
Low: [7] switch is pushed.
Input port for the [6] switch.
Low: [6] switch is pushed.
Input port for the [5] switch.
Low: [5] switch is pushed.
Input port for the [4] switch.
Low: [4] switch is pushed.
Input port for the [3] switch.
Low: [3] switch is pushed.
Input port for the [2] switch.
Low: [2] switch is pushed.
Input port for the [1] switch.
Low: [1] switch is pushed.
I/O ports for LCD driver control
signals.
Outputs resistor select signal for the
LCD driver.
High: Index resistor is selected.
Low: Data resistor is selected.
Outputs reset signal for the LCD
driver.
Low: The LCD driver is reseted.
Outputs mic gain select signal.
High: C a p a c i t o r m i c r o p h o n e i s
selected.
Low: Moving-conductor microphone
is selected.
Outputs microphone key back light
control signal.
Low: Lights ON.
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