Lsi Pin Function - Casio JD-8000 Service Manual

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