Harman Kardon AVR 235 Service Manual page 67

Pin Functions (IC51)
Pin No. Symbol
1 V Ground
SS
2 Xtal
IN1
Crystal oscillator connection
3 Xtal
OUT1
Horizontal synchronization
4 HSYNC
OUT
output
5 Xtal
IN2
Crystal oscillator connection
6 Xtal
OUT2
7 VSYNC Vertical synchronization output
OUT
8 CS Enable input
9 SIN Data input
10 SCLK Clock input
SECAM mode switch input/
11 SECAM
output (command switch)
525/625 switch input/output
12 525/625
(command switch)
NTSC/PAL switch input/output
13 NTSC/PAL
(command switch)
14 3.58/4.43 3.58/4.43 switch input/output
(command switch)
15 RST Reset input
16 CV Video signal output
OUT
17 V Power supply connection
DD2
18 CV Video signal input
IN
19 CV Video signal input
CR
20 SYNC Sync separator circuit input
IN
21 SEP Sync separator circuit
C
22 V Ground
SS
23 PD Control voltage output
OUT
24 AMP
IN
AFC filter connection
25 AMP
OUT
26 FC Control voltage input
27 VCO
IN
LC oscillator connection
28 VCO
OUT
External synchronization signal
29 SYNC
DET
detection output
30 V Power supply connection
DD1
O.S.D IC (74763M)
Function
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)
Description
No. 5039-3/19