Lsi Pin Function - Casio JD-8000 Service Manual

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6. LSI PIN FUNCTION

1.
CPU (HC3000-08-F1)
Pin No.
Signal
1
VREG3
2
DUMMY
3 ~ 5
KO10 ~ 12
6 ~ 14
KO1 ~ 9
15
KI8
16 ~ 22
KI1~7
23 , 25
TRANS, DUMMY
24
BUFON
26
IT2
27
IT0
28
AO17
29 ~ 45
AO0 ~ AO16
46
OEB0
47
WEB0
48 ~ 52
53
CS7B0
54
CS6
55, 56
57 ~ 64
IO0 ~ IO7
65, 66
67
OPT6
68
OPT5
69
OPT4
70 ~ 73
74
PORT7
In/Out
Out
Power supply for RAM / 3(V)
Not used
Out
Not used
Out
Key scan signal
In
Not used
In
Key input signal
Not used
Out
Power supply control for ROM
In
Interrupt signal input
In
Reception data input
Out
Not used
Out
Address bus
Out
Output enable signal for RAM and ROM
Out
Write enable signal for RAM
Not used
Out
Chip enable signal for RAM
Out
Chip enable signal for ROM
Out
Not used
In/Out
Data bus
Not used
Out
Turn on signal for Photo Sensor
Out
Turn on signal for LED (Infrared)
In
Communication data through Photo Sensor
Not used
Interrupt port
— 14 —
Function

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