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© FUNCTIONS OF MICROCOMPUTER IC801 AND ITS PERIPHERAL CIRCUIT
VZ-1550H/E
CP-1550E
13
ARM
LOW/HIGH
T
TT
Name
Input/
| Active
Function
Output
level
MUTING
Output | High
This signal is at High level in any mode other than play mode to activate the muting circuit; it is
kept at Low level in play mode.
4
45/33
Output
| High
This signal becomes
High level when the speed selector key is set at 45 rpm position and it
becomes Low level when at 33 rpm position. It is at Low level when the microcomputer 1C801
is reset.
P. MOTOR
CW
Output | High
This signal, when at High level, causes the phono motor to rotate clockwise.
P. MOTOR
CCW
Output | High
This signal, when at High level, causes the phono motor to rotate counterclockwise.
When
both signals at pins(3)and (4)are at Low level, the phono motor is stopped.
jo
1
+
+
5
L
CR OSC
-
-
The time constant of these pins(5) and (6)is set to produce clock signals of about 400 kHz.
6
+
7
INT
-
-
| Not used.
b
{
8
RESET
Input
Low
When this signal is at Low level, the microcomputer is reset; once reset, the microcomputer
keeps on its standby state for 0.5 second during which alt the functions of the set are stopped.
0.5 second thereafter, the microcomputer judges whether or not the tonearm is present at its
rest position; if not, the microcomputer causes the tonearm to return to the rest position, and
the set gets ready to wait further key operation.
eee: ements
}
9
SOLENOIDE
Output | High
This signal becomes Low level when the tonearm is in up position, and it becomes High level
when in down position.
10
ARM
FWD
Output | Low
This signal, when at Low level, causes the tonearm motor to rotate clockwise.
11
ARM
REV
Output | Low
This signal, when at Low level, causes the tonearm motor to rotate counterclockwise,
When
pins
40) and
ay
of 1C801 are at High level, the tonearm motor is kept in stop.
When these pins become
Low level, IC802 turns on to allow the tonearm to begin moving
on the disc.
And when
the tonearm
is moving, if the tonearm forward or reverse key is pushed, the tonearm
motor turns on and the following pulse is generated for about 0.8 second.
Not used.
Not used (to connect to Vss).
14
vss
Pos
he
ee
16
SIDE A
Output | Low
This signal, when at Low level, causes the side A indicator {LED801) to light up; when the
microcomputer is reset, the signal becomes always Low level.
=
+
16
SIDE B
Output | Low
This signal, when at Low level, causes the side B indicator (LED802) to light up; when the
microcomputer is reset, the signal becomes always High level.
=
+~
|
+
17
BOTH SIDE
Output
| Low
This signal, when at Low level, causes the both sides indicator (LED803) to light up.
18
REPEAT
Output | Low
This signal, when at Low level, causes the repeat indicator (LED804) to light up.
+
19
EP/LP
Output
| Low
This signal becomes Low level with LP record playing and causes the LP Indicator (LED805) to
light up.
b
4
20
VDD
_
-
This is +5V supply pin and is under control by the transistors Q804, Q803 and Q802. The
power supply becomes OV when the function switch (SW201) is set at other than PHONO
position so that the microcomputer stops operation. However, when the function switch is set
at other than PHONO position while the tonearm is anywhere out of its rest position, Q801
turns on to allow 5V power supply to be alive until the tonearm returns to the rest position.
T
=
21
ARM
REST
Input
Low
This signal becomes Low level when the tonearm is at the rest position or when it turns from
the side A to the side B position and vice versa. The rest position is detected when the pulse is
going to rise up.
4
}
+
22
Input
_
23
KEY IN
Input
-
24
Input
-
Matrix formation of these pins provides 9 circuits for key input operation. The key input is of
lock-out type and its chattering is limited to 40 msec.
25
Output | —
26
KEY SCAN
Output | —
27
Output | —
28
ADDRESS
Input
4 1
This signal is combined with the signal (ARM REST) available at pin Q) and the resultant
signal tells the microcomputer where the tonearm is now positioning (at the lead-in and lead-
[
out positions for both sides A and B, and at the signal record zone). Where the tonearm is now
Es
positioning is detected when the pulse is going to rise up or go down.
—15—
VZ-1550H/E
CP-1550E
©
PERIPHERIESCHALTUNG
[ Stift ] Signalbezeichnung
Nr.
Aktiver
Pegel
] Eingang/
Ausgang
Funktion
ia
| MUTING
i Ausgang
| Hoch
2
45/33
+
Ausgang
Hoch
4
P, MOTOR
CW
4
P. MOTOR
CCW
| Ausgang
T Hoch
Ausgang
| Hoch
CR OSC
400 kHz erzeugt werden.
INT
Wird nicht verwendet.
OND
wo
| RESET
Eingang
Niedrig
{
| wird bereit fiir weitere Tastenbedienung.
9
| SOLENOIDE
Ausgang
Hoch
+
10.
| ARM FWD
11.
| ARM REV
Ausgang
Niedrig
Ausgang
Niedrig
dreht.
ARM
LOW/HIGH
Ausgang
Niedrig
13
TEST
4
Wird nicht verwendet (zum AnschlieRen an Vss).
14
VSS
|
Masse
16
SIDE A
|
ae
Ausgang
Niedrig
16
SIDE B
Ausgang
1 Niedrig
—
Wenn dieses Signal niederpegelig ist, bewirkt es, da® die Anzeigt fiir Plattenseite
B (_ED802)
aufleuchtet; bei Riickstellung des Mikrocomputer wird das Signal immer hochpegelig.
V7
BOTH SIDE
Ausgang
| Niedrig
18
REPEAT
Ausgang
Niedrig
19
EP/LP
Ausgang
Niedrig
VDD
———
21
ARMREST
Eingang
Niedrig
2a. 4
23
KEY
IN
24
25
26
KEY SCAN
27
| Eingang
| -
Eingang
-
Eingang
_
Ausgang
-
Ausgang
=
Ausgang
=
4
28 | ADDRESS
a
Eingang
=
|
Dieses Signal wird mit dem am Stift
vorhandenen Signal (ARM REST) kombiniert, und
das sich ergebende Signal informiert
den Mikrocomputer, wo sich der Tonarm gegenwartig
befindet (in der Einlauf- und Auslaufposition der Seite A und B bzw. im Bereich mit
aufgezeichneten Signalen). Die gegenwartige Tonarmposition wird erkannt, wenn der
—~16—
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