— 15 —
Pin No.
Signal
In/Out
Function
1
NC
_
No connect
2 ~ 10
A0 ~ 7, A12
In
Address bus
11 ~ 13
I/O 0 ~ 2
In/Out
Data bus
14
GND
In
GND / 0[V]
15 ~ 19
I/O 3 ~ 7
In/Out
Data bus
20
CE
In
Chip enable signal
21
A10
In
Address bus
22
OE
In
Output enable signal
23 ~ 25
A8, 9, 11
In
Address bus
26
CE2
In
Chip enable signal
27
WE
In
Write enable signal
28
VCC
In
Power supply / 3[V]
Pin No.
Signal
In/Out
Function
109, 110
S1, S2
_
Not used
111 ~ 205
S3 ~ 96
Out
Segment signal for display
206
DUMMY
_
Not used
207, 208
XI, XO
In/Out
Clock terminal (DT-26S)
209
DUMMY
_
Not used
210, 211
PO, PI
In/Out
Main clock terminal (3.45MG)
212
DUMMY
_
Not used
213
PORT2
_
Not used
214
PORT3
_
Interrupt port
215 ~ 217
PORT4 ~ 6
In/Out
For data communication
218
PORT7
_
Interrupt port
219 ~ 222
OPT2 ~ 5
_
Not used
2. RAM (LC3564QM-85)
