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KT-990D
Port allocation
10
Backup (AC OFF) detection terminal. H: AC ON, L: AC OFF. When the
"L" level is detected, the backup status is set and clock is stopped.
(Note) The rise from "'L" to 'H" shall be faster than the rise of the reset
signal.
PY3
H
ROTARY
EN-
Rotary encoder output signal input. H: ON, L: OFF.
CODER "B"
Serial shift clock output. H: Normal
so
Serial display data output
so
|
N.C.
H
~
4
8~15
|PDO~
'
KEY RETURN O~7 | Key return inputs. H: Input present, L: Input absent. All terminals are
PDS
pulled down (by 10K to 100K).
16~19
| PFO~
0
KEY SCAN
1~
Key scanning signals.
PF3
H
| 20 [peo
|
1 |
H
SD
Auto-tuning stop display input. H: TUNE, L: SIGNAL.
21
PE1
|
TEST
Test mode setting input. H: Normal, L: Test.
Normally pulled up. When testing is required, the TEST terminal is
connected to GND.
Fe
L
H/L
AUTO IF BAND
IF band switch input signal for AUTO RF/IF switching mode.
H: Narrow, L: Wide.
Chip Enable output for PLL IC. Connected to pin 3 CL of LM7001.
[25 [per [0 |W PLL GLOGR | tock output for PLL IG. Connected wo pin 4 CL of LM7007.
[26 [pez [0 [4 PLL ATA | ate output for PLL IC, Comecied to pin DATA of LM7O0T.
28
=
i
nN Ley)
me) m w
|
PA
Muting control terminal. H: Muting ON, L: Muting OFF.
Conditions for Muting ON:
1) when Power is turned ON/OFF, 2) when the band is switched,
3) during recalling a preset CH,
4) during manual tuning,
5) during auto tuning,
6) during IF band switching,
7) during RF switching
8) during
REC
CAL
ON/OFF
0
1
2
switching.
29
PA
H/L
AUTO RF
RF switching signal input in AUTO RF/IF switching mode.
switching
H: Direct, L: Distance.
PA
H
M-—>Scommunica- | Data transfer request signal output for M > S display.
tion request
H: Communication request, L: Normal.
wo °
PA3
Vss
Ee
N}o
Freee,
le
Ne
fee
IN
ey
eg
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9) —
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H
MONO/ST
FM Mono/Stereo reception control output
H: Mono,
L: Streo
Vss
AM pack power control output.
H: Power ON,
L: Power OFF
RF SELECTOR
RF switching signa! output. H: Distance, L: Direct.
Fixed at Distance (H) in other reception modes than FM.
w
a
n i)
ZL
H
H
°2)
" w
Wl!
w
N
wn
&
:
|
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