14
Pin
No
.
Signal name
In
/Out
Description
1
2
R/V
I
Out
RAM Data Read/Write signal
During display: High
During read-in: Turns momentarily
low-- - - -
- -
-
13
DI04 In/Out
Data Bus (for data transaction between RAM and display chip)
14 DI03
In
/
Out
During display: High
lS DI02 In/Out
During read-in: Turns
low--l[lllll
16
DIOl
In/Out
17
B8b
Out
Address Bus (for address designation of the display chip)
18
B7b
Out
During display
:
Bl
b=high
,
B2B=low
,
B3b=low,
B4b=low
,
19
B6b Out
BSb=high,
B6b=
h
igh,
B7b=low
,
B8b=low
20
BSb Out
During
read-in
:
Turns momentarily high
21
B4b
Out
.
_
_
____
/
22
B3b Out
23
B2b
Out
24 Blb
Out
2
S
HA Out
Display signal (Common signal counting
pulse
)
.ruu
Be
i
ng generated during
displa
y
ing
--10.Smst--
26
DISP Out
Display command signal
During display: High
During
execution
:
Low
27
VM
In
LCD display voltage (Intermediate voltage of the segment
signal)
28
VA
In
LCD display voltage (High side voltage
of
the segment
s
ignal)
29
GND
In
Supply voltage (OV)
30
H4 Out
LCD common signals (backplate)
31
H7
Out
32
H3 Out
33
H6 Out
34 H2 Out
3S
HS
Out
36
Hl
Out
37
VDISP
In
LCD display voltage (Low side
vo
ltage
of
the
c
ommon
signal
)
38
VB
In
LCD display voltage
(
Lo
w side
v
oltage of
t
he segment
signal
)
39
Sl6
Out
Busy signal to the CPU
I
(
High during the
e
x
ecution in the
CPU II)
During display
:
Low
/
Depression of key causes
i
t momentarily
h
i
gh
.
40 SIS Out
Record signal to the cassette tape and print
data
.
4
1
Sl4
Out
Remote signal to the
M
T.
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