JVC PC-X250 Service Manual page 17

LC78622 Pin Assignment
LC78622 Pin Function
Pin No. Symbol I/O
51 SBCK I
52 FSX O
53 WRQ O
54 RWC I
55 SQOUT O
56 COIN I
57 CQCK I
58 RES I
59 TST11 O
60 16M O
61 4.2M O
62 TEST5 I
63 CS I
64 TEST1 I
Note: The same potential must be supplied to all power supply pins, i.e., V
Subcode readout clock input. This is a Schmitt input. (Must be connected to 0 V when unused.)
Output for the 7.35 kHz synchronization signal divided from the crystal oscillator
Subcode Q output standby output
Read/write control input. This is a Schmitt input.
Subcode Q output
Command input from the control microprocessor
Input for both the command input clock and the subcode readout clock. This is a Schmitt input.
Chip reset input. This pin must be set low briefly after power is first applied.
Test output. Leave open. (Normally outputs a low level.)
16.9344 MHz output.
4.2336 MHz output
Test input. A pull-down resistor is built in. Must be connected to 0 V.
Chip select input. A pull-down resistor is built in. Must be connected to 0 V if not controlled.
Test input. No pull-down resistor. Must be connected to 0 V.
Function
, VV , LV , RV , and XV
DD DD DD DD
PC-X250
.
DD
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