--------------------------------
LCD-III
[~~~~-_;_-I
B<
B<
B':
So
I
~
Al
A2
A,
I A and B
(Note) A's significanca
is
inverted.
C~=~~
I
R.
:
Ru
:
Ru
:
Rn
I
R.
:
R.:
RI2
:
Rill
R2and
R3
(Note)
The
significanca
of
R2 and
R3
is
inverted.
Figure 5 Correspondence
of
Each
Bit
of
the Pattern
""
Y
15 14 13
12
11
10 9 8 7 6 5 4 3 2 1 0
• RAM (RANDOM
ACCESS
MEMORY)
RAM
is
the memory used for data storage and register
save
(data
RAM)
and storage
of
segment data for liquid crystal
display (display data
RAM).
One
unit (digit) consists
of
4 bits and there
is
a total
of
160 digits (640 bits).
(NOTE)
Capacity
of
display data
RAM
varies
by
contents
of
display, and capacity
of
data
RAM
changes
corresponding
to
the former.
Addressing
of
RAM
is
performed by the matrix
of
the me
number and the digit number. There are 10 mes and 16
digits in the matrix. Normally the
me
No.
is
set
to
X and the
digit No.
is
set
to
Y, then the matrix
of
X and Yaddresses
RAM
and performs the Read/Write operation.
Special digits in
RAM
can be addressed without the use
of
X and Y. These digits
are
called
as
memory register (MR)
and the number
is
16
(MRO
to MRlS). Memory register can
be exchanged for A register
By
XAMR
instruction.
RAM
address space
is
shown in Figure
6.
X
i~
15
14 13 12
11
10
9 8 7 6 5 4 3 2 1 0 +- digit No.
!
00
00
10
10
or
!
Ol
it
it
N
:E :E
t
file No.
M
N
it
it
it
:E
:E
:E
i.··
·i.
0
it
>
Ol
a:
:E
00
,..
co
10
or
a:
a:
a:
a:
a:
:E
:E :E :E :E
M
N
...
a:
a:
a:
:E
:E
:E
0
a:
:E
• The area market as
c::::::J
is
usable only for data.
* The data marked as
C::::J
is
usable for both data
and
display.
* The file 8
is
selected when
X register has any value
in
8
to
",and
the
file 9
is
selected when 12
to
15.
Figure 6 RAM Address
Space
In
case
of
the instructions which consist
of
a simultaneous
Read/Write operations
of
RAM
(exchange
of
RAM
and a
register), the writing data doesn't affect the reading data
because the read operation
is
followed
by
the write opera-
tion.
RAM
bit manipulation
is
usable, which performs any
bit
set,
reset or test
of
the addressed
RAM.
Bit assignment is made
by
the program
as
shown below.
151
3
2
o n Bit assignment No.
~-2~'~2-2~--2-1~---~~1
M
The bit test makes the status
"1"
when the assigned bit
is
"I"
and makes
it
"0"
when the assigned bit
is
"0".
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