Integra DTR-7.6 Series Service Manual page 44

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IC BLOCK DIAGRAMS AND DESCRIPTIONS
LC74763-9836 (On-Screen Display IC)
BLOCK DIAGRAM
CS
Serial-
SIN
parallel
converter
SCLK
RST
SECAM
Composite
synchro-
525/625
nization
signal
NTSC/PAL
control
3.58/4.43
VDD1
VDD2
VSS
SYNCDET
VCOIN
VCOOUT
TE
L 13942296513
FC
AFC
circuit
AMPIN
AMPOUT
PDOUT
SYSIN
Sync
separator
SEPC
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8-bit latch
and
command
decoder
Horizontal Vertical
character character
size register size register
Horizontal Vertical
size size
counter
counter
Sync
detector
Composite
synchronization
Timing generator
signal separator
control
HSYNOUT VSYNOUT
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2 9
8
Flashing/
Horizontal Vertical
reversal
display
display
control
position
position
register
register
register
Flashing/
reversal
Horizontal Vertical
control
dot counter dot counter
circuit
Horizontal
Vertical
display
display
position
position
detection
detection
Line
Character
control
control
counter
counter
Q Q
3 6 7 1 3 1 5
Synchronization
signal generator
Xtal IN1 Xtal IN2
Xtal OUT2
Xtal OUT1
co
.
9 4 2 8
Display
RAM write
control
address
register
counter
Display RAM
Decoder
0 5 8 2 9 9 4 2 8
Character output control
Background control
video output control
CVCR CVIN CVOUT
m
DTR-7.6
9 9
Font ROM
9 9
Shift register