Harman Kardon AVR225 Service Manual page 29

AVR225
Pin Functions
Pin No. Symbol
1 V
SS
2 Xtal
IN1
3 Xtal
OUT1
4 HSYNC
OUT
5 Xtal
IN2
6 Xtal
OUT2
7 VSYNC
OUT
8 CS
9 SIN
10 SCLK
11 SECAM
12 525/625
13 NTSC/PAL
14 3.58/4.43
15 RST
16 CV
OUT
17 V
DD2
18 CV
IN
19 CV
CR
20 SYNC
IN
21 SEP
C
22 V
SS
23 PD
OUT
24 AMP
IN
25 AMP
OUT
26 FC
27 VCO
IN
28 VCO
OUT
29 SYNC
DET
30 V
DD1
Function
Ground
Crystal oscillator connection
Horizontal synchronization
output
Crystal oscillator connection
Vertical synchronization output
Enable input
Data input
Clock input
SECAM mode switch input/
output (command switch)
525/625 switch input/output
(command switch)
NTSC/PAL switch input/output
(command switch)
3.58/4.43 switch input/output
(command switch)
Reset input
Video signal output
Power supply connection
Video signal input
Video signal input
Sync separator circuit input
Sync separator circuit
Ground
Control voltage output
AFC filter connection
Control voltage input
LC oscillator connection
External synchronization signal
detection output
Power supply connection
LC74763, 74763M
Ground connection
Connection for the crystal and capacitor used to form the crystal oscillator that generates
the internal synchronization signal. The oscillator can be selected with a command switch.
Outputs the horizontal synchronization signal (AFC). The output polarity can be selected
(metal option). Also functions as general output port (command switch).
Connection for the crystal and capacitor used to form the crystal oscillator that generates
the internal synchronization signal.
Outputs the vertical synchronization signal. The output polarity can be selected (metal
option). Also functions as general output port (command switch).
Enables/disables serial data input. Serial data is enabled when this pin is low (hysteresis
input). Pull-up resistor built in (metal option).
Serial data input (hysteresis input). Pull-up resistor built in (metal option).
Clock input for serial data input (hysteresis input). Pull-up resistor built in (metal option).
During input, switches between SECAM and other modes.
During output, functions as general output port or internal V output (command switch).
Low = other modes, high = SECAM mode
During input, switches between 525 scan lines and 625 scan lines.
During output, functions as general output port or character data output (command switch).
Low = 525 lines, high = 625 lines
Switches the color mode between NTSC and PAL.
During output, functions as general output port or frame data output (command switch).
Low = NTSC, high = PAL
Switch FSC between 3.58 MHz and 4.43 MHz.
During output, functions as general output port or halftone output (command switch).
Low = 3.58, high = 4.43
System reset input pin, low is active (hysteresis input).
Pull-up resistor built in (metal option).
Composite video output
Power supply connection for composite video signal level generation
Composite video input
SECAM chroma signal input
Built-in sync separator circuit video signal input
Built-in sync separator circuit
Ground connection
AFC control voltage output
Filter connection
AFC control voltage input
VCO LC oscillator circuit coil and capacitor connection
Outputs the exclusive NOR of the horizontal synchronization signal (AFC) and CSYNC (sync
separator). The output polarity can be selected (metal option). Also functions as general
output port (command switch).
Power supply connection (+5 V: digital system power supply)
29
harman/kardon
Description