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Pin No.
Pin Name
68
VKK
69
VDD
70
XIN
71
VSS
72
XOUT
73
RESET
74
CH
75
BUSY
76
TEST
77
—
78
I2C DATA
79
I2C CLK
80
—
I/O
—
Power supply terminal (–30V) (for fluorescent indicator tube drive)
—
Power supply terminal (+5V)
I
System clock input terminal (12.5 MHz)
—
Ground terminal
O
System clock output terminal (12.5 MHz)
System reset signal input from the reset signal generator (IC502) "L": reset
I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
O
Not used (open)
I
Not used (open)
I
Connected to ground
—
Not used (fixed at "L")
I/O
Communication data bus with the system controller (IC501)
Communication data reading clock signal input or transfer clock signal output with the system
I/O
controller (IC501)
—
Not used (fixed at "L")
Description
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