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4 - 3
4-5 PORT ALLOCATIONS
• CPU (IC8)
• D/A CONVERTER (IC10)
Pin No.
LINE
NAME
DESCRIPTION
I/O
1
MMUT
MIC mute switching.
L=MIC mute.
O
3
TONE
DTMF/1750 Hz tones and beep
sounds.
O
4
CTCOUT CTCSS/DTCS signals.
O
10
RESET
CPU reset signal.
H=The CPU is reset.
I
15
CSHIFT
CPU clock shift contol.
H= While the oscillation frequency
is shifted.
O
17
DUSE
DTCS fi lter switching.
H=while the DTCS is in use.
O
18
UNLK
PLL unlock detect.
H= W h i l e t h e P L L c i r c u i t i s
unlocked.
I
19
NOIS
Noise signal.
I
22
POWER
[POWER] key input.
I
23
PTT
External PTT input.
H=An external PTT is pushed.
I
24
SHIFT
VCO oscillation frequency shift
control.
L=While receiving.
O
25
PSVCO
Power supply line for the VCO
switching.
H=While the VCO is activated.
O
26
PS5C
P o w e r s u p p l y l i n e " P S 5 "
switching.
L= While the transceiver is in the
power save mode.
O
27
R5C
Power supply line "R5" switching.
L= While receiving.
O
28
T5C
Power supply line "T5" switching.
L=While transmitting.
O
29
TXC
Transmitting control.
L=TX mute.
O
30
PCON
Po w e r s u p p l y l i n e " S W 5 V "
switching.
H= While transceiver's power is
ON.
O
62
NWC
Discriminator dumping resister
switching.
H= While receiving in the wide
mode.
O
63
INTPTT
Internal PTT input.
L=[PTT] is pushed.
I
64
ITNMIC
Internal microphone control.
O
65
MIC2
Microphone gain control.
H=MIC gain "L."
O
66
MIC1
Microphone gain control.
H=MIC gain "M."
O
67
LEDC
LCD backlight control.
H=Backlight ON.
O
68
DICK
CONTROL DIAL [VOL] inputs.
I
69
DIUD
71–74
KS0–KS3 Keypad scanning signal outputs.
O
75–77
KR0–KR3 Keypad inputs.
I
Pin No.
LINE
NAME
DESCRIPTION
I/O
80
VOX
Microphone voice input detect.
I
81
VIN
Remaining battery voltage.
I
83
TEMP
The temperature sensing voltage.
I
84
SD
RSSI from the IF demodulator IC
(IC2, pin 13).
I
85
CTCIN
CTCSS/DTCS signals.
I
86
WXALT
Weather alert detect.
I
87
DASTB
D/A converter strobe.
O
88
PLLSTB
PLL strobe.
O
89
DATA
Common serial data.
O
90
CK
Common serial clock.
O
94
ESCK
Clock to the EEPROM.
O
95
ESDA
Serial data to/from the EEPROM. I/O
98
SPMUTE
Speaker output control.
H=Speaker mute.
O
99
AFON
AF power AMP control.
L= T h e A F p o w e r A M P i s
deactivated.
O
100
RMUT
RX AF line mute switching.
L=AF mute.
O
Pin
No.
LINE
NAME
DESCRIPTION
I/O
23
T1
Tuned BPF (D9) tuning voltage.
O
24
T2
Tuned BPF (D11) tuning voltage.
O
7
T3
• While receiving:
BPF tuning voltage.
• While transmitting:
TX power control reference voltage.
O
8
FC
Reference frequency adjust voltage.
O
10
DET
Squelch threshold level adjustment.
I
11
SQL
O
12
DTC
DTCS deviation adjustment.
O
13
MODIN
I
18
MODIN
FM deviation adjustment.
I
19
DEV
O
20
VOLOUT
Audio output power adjustment.
O
21
VOLIN
I