Denon AVR-3801 - Page 17

17
AVR-3801
M35015-210SP Terminal Function
Pin No. Symbol Name I/O Function
1 OSC1 Osc. circuit ext. I External terminal for indication oscillator circuit. Standard OSC. freq. is approx. 7MHz.
2 OSC2 terminal. O With this OSC. freq., decides horizontal indicatin and character width.
3 CS Chip select input I
Chip select terminal and turns to “L” when transfer serial data.
Hysteresis input. Pull up resistor is built-in.
4 SCK Serial clock input I
Takes in serial data of SIN at SCK rise when CS terminal is in “L”.
Hysteresis input. Pull up rersist is built-in.
5 SIN Serial data input I
Serial input of register for indication control and data, and address for indication data
memory. Hysteresis input. Pull up rersistor is built-in.
6 AC Auto-clear input I
Resets internal circuit of IC at “L” mode.
Hysteresi input. Pull up resistor is built-in.
7V
DD2
Power supply

Power supply terminal of analog system. Connect to +5V.
8CVIDEO
Combined
video output
O
Output terminal of combined video signal. Outputs 2Vp-p combined signal. Character
output, etc. Overlap CVIN signal and outputs at superimpose.
9 LECHA
Character level
input
I
Input terminal deciding character output level in combined video signal. color of character
is white.
10 CVIN
Combined video
input
I
Input terminal of external combined video signal.
Character output etc. overlap this external combined video signal.
11 Vss Ground

Ground terminal. Connect to GND.
12 P0 Output port p0 O
General output or character background signal BL NK1* output is switchable.
Polarity can be selected at ROM mask.
13 P1 Output port P1 O
General output or character background signal CO1* output is switchable.
Polarity can be selected at ROM mask.
14 P2 Output port P2 O
General output or character background signal BLNK2* output is switchable.
Polarity can be selected at ROM mask.
15 P3 Output port P3 O
General output or character background signal CO2* output is switchable.
Polarity can be selected at ROM mask.
16 OSCOUT O Terminal for external use of sync signal OSC. circuit. Use the freq.: 14.32MHz at NTSC
17 OSCIN I system, 17.73MHz at PAL. system, 14.30MHz at MPAL system.
18 HOR*
Horizontal sync
signal
I
Inputs horizontal sync signal.
Hysteresis input.
19 VERT*
Vertical sync
signal

Input vertical sync signal. Hysteresis input. Polarity can be selected at ROM mask.
20 V
DD1
Power supply I Power supply terminal of digital system. Connect to +5V.
Ext. terminal
for sync sig.
OSC. Circuit
M35015-210SP (AC: IC308)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
OSC1
OSC2
CS
SCK
SIN
AC
V
DD2
CVIDEO
LECHA
CVIN
V
DD1
VERT*
HOR*
OSCIN
OSCOUT
P3
P2
P1
P0
Vss
CS
SCK
SIN
V
DD1
20
AC
Vss
V
DD2
P1
P0
CVIN
LECHA
CVIDEO
OSCOUT
OSCIN
HOR*VERT*OSC2OSC1
IN P U T
CONTROL
CIRCUIT
INDICATION
O S CILLATO R
DATA
CONTROL
CIRCUIT
ADDRESS
CONTROL
CIRCUIT
TIM ING
GENERATOR
INDICATION
CONTROL
REGISTER
INDICATION RAM
INDICATION CHARACTER ROM
BLINKING CIRCUIT
SHIFT REGISTER
INDICATION
CONTROL CIRCUIT
READ OUT ADDRESS
CONTROL CIRCUIT
IINDICATION LOCATION
DETECTION CIRCUIT
H COUNTER
SYNC SIGNAL
SW ITCHING CIRCUIT
S Y N C S IG N A L D IS -
CRIMINATING CIRCUIT
OSC CIRCUIT
FO R SYNC SIGNAL
GENERATION
TIM ING
GENERATOR
NTSC
VIDEO OUTPUT
CIRCUIT
6
11
5
4
3
7
1 2 19 18
17
16
8
9
10
12
13
P2
14
P3
15
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