Yamaha RX-V990, Руководство по обслуживанию

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IC508 : M35010-062SP
Superimpose
RX-V990
Pin No.
Symbol Terminal name
Function
1
OSC1
External terminal for
External terminal of oscillation circuit for display.
2
OSC2 oscillation circuit
The standard oscillation frequency is about 7MHz.
The display position in the horizontal direction and width of characters on the TV screen
are determined
according to this oscillation frequency.
3
CS
Chip select input
Chip select terminal
"L" is set when the serial data is transferred.
Hysteresis input. A pull-up resistor is built in.
4
SCK
Serial clock input
When CS terminal is "L", the SIN serial data is taken in at the SCK rise.
Hysteresis input. A pull-up resistor is built in.
5
SIN
Serial data input
The data and addresses for the display control register and display data memory are input
in serial form.
Hysteresis
input. A pull-up resistor is built in.
6
AC
Auto clear input
The IC internal circuit is reset when in "L" state.
Hysteresis input. A pull-up resistor is built in.
7 VDD2
Power supply terminal
Analog type power supply terminal that should be connected to +5V.
8
CVIDEO Composite video signal
Output terminal for composite video signal
output
2Vp-p composite video signal is output.
When making a superimposition, the character output and other features are superim-
posed on the composite video signals inputted through the CVIN terminal.
9
LECHA
Character level input
Input terminal to determine the output level for the characters in the composite video
signals. The color of characters is white.
10
CVIN Video input
Input terminal for external composite video signals.
When making a superimposition, the character output and other features are superim-
posed on these composite video signals.
11
Vss Ground terminal
Connection to GND.
12
PO
Port
0
output
Port terminal output or character baCkground signals (BLNK1) are output.
The polarity can be selected when determining the font ROM.
13
P1 Port 1 output
Port terminal output or character baCkground signals (C01) are output.
The polarity can be selected when determining the font ROM.
14
P2
Port 2 output
Port terminal output or character background signals (BLNK2) are output.
The polarity can be selected when determining the font ROM.
15
P3 Port 3 output
Port terminal output or character background signals (C02) are output.
The polarity can be selected when determining the font ROM.
16
OSCOUT Oscillation circuit for
External terminal of the oscillation circuit for generation of synChronous signals.
17 OSCIN
generation of
The oscillation frequency is 14.32MHz when the NTSC system is used and 17.73MHz
synChronous signals
when the PAL system is used.
18
HOR
Horizontal synchronous
Horizontal synchronous signal input.
signal input Hysteresis input
The polarity can be selected when determining the font ROM.
19
VERT Vertical synChronous
Vertical synchronous signal input.
signal input
Hysteresis input
The polarity can be selected when determining the font ROM.
20
VDD1 Power supply terminal
Digital type power supply terminal that should be connected to +5V.
16