– 71 –
Pin No. Pin Name I/O Function
70 XIN I
System clock input terminal (12.5 MHz)
71 VSS —
Ground terminal
72 XOUT O
System clock output terminal (12.5 MHz)
73 RESET I
System reset signal input from the reset signal generator (IC502) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
74 CH O
Not used (open)
75 BUSY I
Not used (fixed at “L”)
76 TEST I
Connected to ground
77 GRAD R1 O
Not used (open)
78 I2C DATA I/O
Communication data bus with the system controller (IC501)
79 I2C CLK I/O
Communication data reading clock signal input or transfer clock signal output with the system
controller (IC501)
80 GRAD R2 O
Not used (open)
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