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PR-8210-A
(11) Input buffer
This input buffer serves as the CPU extended
input port buffer for storage of status informa-
tion received from various parts of the player.
(12) Slow timer
Тһе NE555 and the slow speed VR plus сарас!-
tors
mounted
on
the
KEYC
circuit
board
operate
as
2 ММУ
for slow
motion
speed
settings.
(13) LED driver
(14) CPU
зо
(15) Data processor
This IC is a 42-pin NMOS IC with an operating
clock frequency
of 3.02MHz.
The four major
functions are listed below.
1. Decoding of the Philips code extracted from
the playback video signal.
2. Storage of the above data.
3. Character display control.
4. 8-bit x 2 port processing.
Тһе Philips code decoder
catches
the leading
edge
of the
500kHz
Philips
code
by
3.02MHz
scanning and subsequently
detects the frame по..
chapter no., time no., and the various mode
flags.
This data is then passed on to the CPU.
The
data storage
RAM
stores
data
from
the
reader
and
designated
data
from
the
CPU
in
20 byte units.
The
display
output
stage
generates
outputs
ai the
prescribed
position
synchronized
by the
horizontal synchronizing signal in accordance with
CPU
directions and
with 3.02MHz
as the display
clock.
(16) IOIB
The
IOIB
is the
interface
between
the
PR-8210-A
and external controller. Signals are
sent and received through the 24-pins connec-
tor on the rear terminal board. The following
system information signals are output from the
PR-8210-A.
e COMP
SYNC
(=4)
Sync signal separated from the video signal
• DATA
(#2)
Frame data separated from the video signal
e V SYNC
(=1)
Vertical
syne
signal
separated
from
the
COMP
SYNC
e VIDEO
SQ (=3)
Command
that
prohibits
the
video
signal
from being sent to the TV set
• STAND
BY
(#5)
Command that lights the stand-by indicator
The following signals are input from the exter-
nal controller
together
with
each
INT/EXT
(the
internal and external control switching signal).
e REMOTE
CONT
(+10)
The serial code signal for the various opera-
tion commands
e JUMP
TRIGGER
(#12)
Command that activates track jump
• SCAN
C (#6)
Command
that determines
the direction of
track jump and scan
DISPLAY
(#8) is the command that prohibits
sending
the display
characters to the TV screen.
Pins of 413-524 are connected to ground.
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