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4-4
PIN
NO.
LINE
NAME
DESCRIPTION
I/O
1
BEEP
Beep audio (Square waves) to the AF
AMP (IC1).
O
2
SENC
2/5 tone and DTMF encoding output.
O
17
RMUT
RX AF mute switch control.
L=During the squelch is closed.
O
18
TMUT
Transmission mute.
L=TX inhibit.
O
19
MMUT
MIC mute switch control.
L=MIC mute.
O
20,
21
MGC1*,
MGC0*
MIC gain control.
O
22
CL0
Cloning data.
O
23
CLI
I
24
CSFT
CPU clock frequency shift control.
H= W h i l e t h e c l o ck f r e q u e n c y i s
shifted.
O
25
AUTX
Automatic TX control in the VOX
mode.
H=Microphone input is detected.
O
26
NWC
RX mode (narrow/wide) switching.
L= While receiving in the narrow
mode.
O
27
AFON
AF power AMP control.
H=AF power AMP (IC55) is activated.
O
28
SCK
Common serial clock.
O
29
S0
Common serial data.
O
34
ESCL
EEPROM clock.
O
35
ESDA
EEPROM data.
I/O
36
DAST
D/A converter strobe.
H=Load enable.
O
37
PLST
PLL IC strobe.
H=Load enable.
O
38
R5C
Receive circuit power supply line
"R5" control.
H= W h i l e t h e r e c e i v e c i r c u i t i s
activated.
O
39
T5C
Transmit circuit power supply line
“T5V” control.
L=While transmitting.
O
40
S5C
TX/RX common circuit power supply
line "S5V" control.
L=While in the power save mode.
O
46
TLED
TX LED indicator control.
L=While transmitting.
O
47
RLED
RX LED Indicator control.
L= While receiving a signal or the
squelch is open.
O
48
LIGT
LCD backlight control.
H=Lights.
O
56,
57
CENC2,
CENC1
CTCSS/DTCS encoding output.
O
58
DUSE
AF LPF switching.
H=While sending the DTCS signal.
O
59–
62
CBI0–
CBI3
[ROTARY SELECTOR]
input.
O
70
NOIS
Noise level detect.
H=While receiving a signal.
I
71
UNLK
PLL unlock detect.
L=Unlocked.
I
72
KR0
[P0]
,
[1]
,
[2]
and
[3]
input.
L=Pushed.
I
4-5 PORT ALLOCATIONS
• CPU (IC9)
PIN
NO.
LINE
NAME
DESCRIPTION
I/O
73
KR1
[P1]
,
[4]
,
[5]
and
[6]
input.
L=Pushed.
I
74
KR2
[P2]
,
[7]
,
[8]
and
[9]
input.
L=Pushed.
I
81
KR3
[P3]
,
[*]
,
[0]
and
[#]
input.
L=Pushed.
I
82
KS0
[P0]
,
[P1]
,
[P2]
and
[P3]
input.
L=Pushed.
I
83
KS1
[1]
,
[4]
,
[7]
and
[*]
input.
L=Pushed.
I
84
KS2
[2]
,
[5]
,
[8]
and
[0]
input.
L=Pushed.
I
85
KS3
[3]
,
[6]
,
[9]
and
[#]
input.
L=Pushed.
I
86
SDEC
Decoded 2/5 tone and DTMF signals.
I
87
CDEC
Tone signal (CTCSS/DTCS) decoding
input.
I
88
EPTT
External PTT input.
H= An external PTT is pushed.
I
89
IPTT
[PTT]
input.
L= Pushed.
I
90
TEMP
Transceiver temperature sensing
voltage.
I
91
BATV
Battery voltage.
I
92
KRA
[S1]
,
[S2]
and
[EMER]
input.
L= Pushed.
I
93
SDEC2
Decoded 2/5 tone and DTMF signals.
I
95
AFVI
[VOLUME CONTROL]
input.
I
96
RSSI
Input port for RSSI signal from the IF
IC (IC16, pin16).
I
97
LVIN
Lock voltage input.
I
98
MDET
Exter nal microphone connection
detect.
I
99
VOXV
Microphone input sensing voltage.
I
*: MIC
sensitivity
setting.
Line name
MGC0
MGC1
MIC sensitivity
Line state
H
H
4 (Maximum)
L
H
3
H
L
2
L
L
1 (Minimum)