Denon AVR-1804 Service Manual page 17

9
CS
8-bits
Serial
latch
SIN 11 +
parallel
command
converter
decoder
SCLK 10
RST 23
VDD1
24
VSS1
1
VDD2 12
CHARA 8
Horizontal
OSCIN
6
character
size
OSCOUT 7
register
SYNIN
17
Horizontal
character
SEPC 18
size
SEPOUT
19 register
SEPIN 20
CTRL3
22
LC74781 (IC1006)
Horizontal Vertical
character character
size size
register register
Horizontal Vertical
size size
counter counter
Horizontal
character
size
register
Timing generator
Horizontal
character
size
register
4
CTRL1
AVR-1804/884 / AVC-1880
Pin No. Symbol
1 VSS1
2 Xtal IN
3 Xtal OUT
4 CTRL1
5 BLANK
6 OSC IN
7 OSC OUT
8 CHARA
9 CS
10 SCLK
11 SIN
12 VDD2
13 CV OUT
14 NC
15 CV IN
16 VDD1
17 SYN IN
18 SEP C
19 SEP OUT
20 SEP IN
21 CTRL2
22 CTRL3
23 RST
24 VDD1
Horizontal Vertical Blinking
display display and inversion
position position control
register register register
Blinking
Horizontal Vertical
and inversion
dot dot
control
counter counter
circuit
Blinking Blinking
and inversion and inversion
control control
register register
Character Line
control control
counter counter
Character output control
Synchronization
Background control
signal generator
Video output control
21 2 3 5
CTRL2 XtalIN XtalOUT BLANK
17
Name
GND
Xtal oscillation
Xtal oscillation
Xtal oscillation input switching
Blank output
LC oscillation
LC oscillation
Character output
Enable input
Clock input
Data input
Power
VIDEO signal output
VIDEO signal input
Power
Sync. separate circuit input
Sync. separate circuit bias voltage
Complex sync. signal output
Vertical sync. signal input
NTSC/PAL-M switching input
SEP IN input control
Reset input
Power (+5V)
RAM
Display
write
control
adress
register
counter
Display
RAM
Decoder
Font
RAM
Shift
register
15 13
CVIN CVOUT
17