40
41
42
43
44
45
46
48
49–51
52
53
54
55
61
62
63
71
74
75
78
79
Outputs 1750 Hz European tone sig-
nal.
Outputs a strobe signal for the option-
al UT-102 (Voice synthesizer unit).
Outputs serial data for the I/O
expanders, optional AT-180/UT-102.
Outputs a clock signal for the I/O
expanders, optional AT-180/ UT-102.
Outputs a strobe signal for the I/O
expander ICs (IC2231, IC2232).
Outputs a strobe signal for the I/O
expander ICs (IC2221, IC2222).
Outputs a strobe signal for the D/A
converter IC (IC2201).
Outputs a strobe signal for the BFO
DDS IC (PLL unit; IC901).
Output mode control signals for the 1st
LO DDS IC (PLL unit; IC101).
Outputs a strobe signal for the 1st LO
DDS IC (PLL unit; IC101).
Outputs a strobe signal for the 1st LO
PLL IC (PLL unit; IC461).
Outputs serial data for the DDS ICs
(PLL unit; IC101, IC901) and PLL IC
(PLL unit; IC461).
Outputs a clock signal for the DDS ICs
(PLL unit; IC101, IC901) and PLL IC
(PLL unit; IC461).
Outputs AGC rate select signal
Low : When AGC fast is selected.
Outputs the NB switch (Q635) control
slignal.
High : When the [NB] is turned ON,
except FM/WFM modes.
Outputs the attenuator circuit control
slignal.
High : When the [ATT] is turned ON.
Outputs a strobe signal for the TX FM
PLL IC (IC1011).
Input port for transmit/receive switch-
ing signals for the [ACC] connector.
Low : While transmitting.
Outputs a CW keying signal or RTTY
TX signal.
Output port for CI-V bus line.
Input port for CI-V bus line.
ETON
MSST
MDT
MCK
BSTB
DSST
ASTB
PBST
CON2–
CON0
PDST
PMST
PDT
PCK
AFGS
NBS
ATTS
FMST
SNDS
KDS
LTXD
LRXD
(MAIN unit; IC2001)–Continued
Pin Port
Description
number name
13
14
15
16
17
18
19
20
21
22
23
24
30
31
32
33
34
37
39
Input port for the external paddle
(DASH).
Low : During key down
Input port for the external paddle
(DOT) or straight key.
Low : During key down
Input port for the PLL unlock signal
from the DDS IC (PLL unit; IC101) and
PLL IC (PLL unit; IC461).
Low : while PLL unlock
Input port for transmit control signal
from the optional AT-180/AH-4 anten-
na tuners.
Input port for the optional antenna
tuner connection detection.
High : When the optional antenna
tuner is connected.
Outputs a squelch control signal for
the external unit.
Input port for the [POWER] switch.
Low : When the [POWER] switch is
pushed.
Outputs the switching relay (PA unit;
RL591) control signal.
High : While power is ON.
Outputs start signal for the optional
AT-180 antenna tuner.
Output port
: Beep audio signals while
receiving.
: CW side tone signals while
transmitting.
Outputs start signal for the optional
AH-4
Outputs squelch mute control signal,
applied to the AF mute switch (MAIN
board; Q772).
Low : While squelch is closed.
Input port for the CTCSS decode sig-
nal from the low-pass filter (IC811C).
Input port from the [RTTY] or [MIC]
connector.
High : While transmitting.
Input port for the VOX voltage.
Input port for the anti-VOX voltage.
ALC level input port for the ALC meter
indication.
Outputs subaudible tone signals.
Input port for the optional UT-102
(Voice synthesizer unit) activation sig-
nal.
High : During speech synthesis.
3-4-4 MAIN CPU PORT ALLOCATIONS
(MAIN unit; IC2001)
DASK
DOTK
UNLK
TKEY
TCON
SQSS
PWK
POWS
ATST
BEEP
AHST
AFMS
CTCV
SNDL
VOXL
AVXL
ALCV
TONE
SPBK
Pin Port
Description
number name
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