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RC-999 11
CIRCUIT DESCRIPTION
3-2. Terminal description table
Symbol
Terminal Name
_
Description
KO~K3
Key return signal inputs
Input terminals for return signal from the Dynamic key matrix.
Each terminal is connected to a pull-down resistor.
DA~DD
Digit outputs
;
Sources of key-return and display signals.
The 4-bit BCD output from wPD4028D are converted into 10 digits.
RESET
:
Reset input
Microprocessor initialization terminal,
The microprocessor executes initialization when it turns from "'H" to "L".
X2,.X1 :
X'tal oscillator
X'tal oscillator connection terminals (4.5MHz).
MPS REQ_
M-S request signal
|
Communication request signal from the Master to Slave.
MUTE
Muting output
Output signal for muting shock noise occurring during PLL or mechanism
operation. Active ""L"'.
TAPE PC OUT
7 | Tape power control output
| Outputs P-CON signal during tape transport. Used as the TAPE PC OUT terminal
for controlling both the signal system and PC. Basically goes ''H'' when a tape
inserted. However, the level may go "Ue during TUNER
CALL.
RESET OUT
Mutual reset terminal
Output signai performing mutual resetting to the set in the previous stage.
Sa~Sl
,
Segment signal outputs
ae
Segment output signals. _
Lo
7 oa.
GND-
Ground
7 7 .
Connected to the ground.
=
aes
7
REEL T
"| Reel pulse detector
=
Detects the forward ree! Pulse.
7
H
REEL SS)
~
Ree! pulse detector.
:
Detects the reverse reel pulse.
ke
_
beak
7
29
ig a. SoM R EQ. : -
S>M 'request signal
-! 7 As Communication re request signa} from the Slave to 'Master.
_
30
REMOCON
IN
|F Remote control input
| Detects the signal sent through the fight receiver.
31
ACC
IN
~
ACC detector
~
i
Input terminal which detects the » Accessory switch position. "L" for backup mode.
32
MUSIC
IN" -
Music detector
-
Detects if music signal is present. Active ete
33
S METER
Signal meter detector
TD Divides 0 to 5V (VDD) in 8 sections (0.625V each) and
|
;
detects the field intensities.
a
— —
34
AV IN
"| Auto volume detector
Divides 0 to 5V (Vpp) in 16 sections (0. 3125V each) and
{
detects the external noise levels.
Detects whether the present broadcast is stereo, and inputs °H" when receiving
mye
| astereo broadcasting station. Even when the ST detection signal is
i the display is turned OFF under the following conditions:
35
ST IN
| Stereo input signal
i
|
i
H
i
i
i
1
o With AGC CUT output.
o When SD detection is "L''.
© In MW band.
36
SD IN
SD input signal
During auto tuning (UP SEEK/DOWN
SEEK and ; auto memory), detects whether
fe
a broadcasting station is received, and inputs ''H'' when a station is received.
37
7 HI/LO
>
AY High/Low switch aaa
Switches the auto-volume sensitivity.
a
38
PCL
Reference frequency output | Reference output for X''tal deviation adjustment qa. O5MHz).
VOL MUTE
"H'' when the volume data is —co
Volume muting output
18
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