IC3, HM6264ALFB-50
GND 14
Pin No. Signal Name
In/Out
Function
1
NC
-
NC
2'V10 A12'VAO
In Address signal
11'V13 1/01'V1/03
In/Out
Data signal
14
GND In VSS terminal
15'V19
1/04'V1/08
In/Out
Data signal
20
CE1
In Chip enable
21
A10
In/Out
Address signal
22
OE
Out
Output
enable
23'V25
A11,9,8
In/Out
Address signal
26
CE2
In
GND
27
RIW
In Read/write signal
28
VDD
In
GND
DISPLAY
Numbers and characters are displayed
in
5 x 7 dots.
Following
is
an explanation
of
a dot-matrix
LCD.
e12
c12
a12
e1
c1
a1
60606
60606
00000
00000
00000
Lower electrode
00000
00000-----------00000
00000
00000
00000
00000
09
0
9
0
09
0
9
0
d12
b12
d1
b1
R8-o0000
00000
R9--D0000
00000
RIO
-00000
Upper electrode
00000
Rl1--Q0000---
----00000
R12-o0000
00000
R13
-aoooa
00000
1"14
-00000
00000
"----------"Vr---------
Left-half 12 digits
e12 c12 a12
e1
c1
a1
~O~O~
do~o~
00000 00000
00000
Lower electrode
00000
00000---
----00000
00000
00000
00000 00000
O?O?O
090?0
d12
b12
d1
b1
00000
OOOOo-RO
00000
OOOOD--RI
00000
Upper electrode
0000D-R2
00000---
---OoOOcr-R3
00000
0000~R4
00000
OOOOo--RS
00000
0000CJ-R6
"--------
__
"V_-------~
Right-half 12 digits
e1
d1
c1
b1
a1
+++-t+-I-+++-++-+
__
- R0
--+++++++++-If+t-I+t-- R1
--+++-++++++-1++-+++-R2
--+++-+++t+t-tt++H-
R3
--+++-+++-I+t-t+++H-RL.
-+++-+f++f++t+-t++--
RS
-++++H-++-H+t-H+--
R6
On
the
upper
electrode
of
the
LCD,
common
signals
RD'V
R6 and
R8'V
R14
are applied horizontally while
other
signals
al'Vel
to
a12'Ve12 are applied
vertically
on
the
lower electrodes as shown in above figures.
In
the
left figure,
the
upper-right
corner
of
the
dot
is
displayed when a vol-
tage difference exists between signals
RD
and
al.
The
CPU
outputs
the
dis-
play signals
to
the
LCD
display.
CPU
HD61747B2D
controls
the
1st
to
6th
and
13th
to
18th
digits
of
dis-
play, while HD61747B25 controls
the
7th
to
12th
and
19th
to
24th
digits.
-9-
-----~-----------------------------------------
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