LCD-IV------------------------------------------------------------------
SED, AED SEDD, [
AEDD
Instruc·
tion
TO Instruction [
-
One I nstruction Cycle
/'
"
On
Set/Aeset
Instruction
DnlLSI
pin)
On
Test
~
Instruction
.f]....
On Sampling
~
Pulse
Figure
15
Timing Chart
of
Discrete
I/O
• Data
I/O
(R
Terminal)
Table
6
Data
I/O
for
the LCD-IV
1/0
common channel A1,
A2
12
channels)
Input channel
AO
11
channell
Output
channel
A3
11
channell
Total
4 channels
INOTE)
In
addition
to
the
above, A4,
A5
and A6 are provided as
register setting
liquid crystal display mode.
In
these registers,
there
is
no terminal and exists only data
1/0
register each,
which
controls liquid crystal display mode. Data
is
transferred
to
A4,
A5
and A6 by
LAA
or
LAB
instruction, same as data
transfer
to
data
1/0
registers
of
A1,
A2
and A3. For details
of
R4, R5 and R6, refer
to
LIQUID CRYSTAL DISPLAY.
Input
,..----~
I I
I
2'-
... :
---0
R }
To
I
22
lOR::
A,
BIRO
Channel
Register:
2'
0 R
o
,
:~
t o
Roo
I..
___
..I
Output
ROM
paltern
orda"
r
---
--
----~
4·bit register (data I/O register) each
is
attached
to
an I/O
common channel and
output
channel. No register
is
attached
to
input channel. Addressing to all channels
is
performed by
programs (addressed by operands
in
instructions).
Figure
16
shows the block diagram
of
each channel.
(
So,;.1
segment
01,,101
Latch
clock
Display
ICll1
Oat.
S,hift clock
(Cl
l
l
Ahernatlng
slW'.IIMI
0.,.
( ::
2'
2"
Output
-- ----
--,
I
I ,
~
-
+-
---
--
-----
-r
J
Set all
bits
to
I
;~~~~~~~set
:
2'
21
21
2)
:
L
______
.J
Gate
for
exchanging
the
output
registe,
signal
and
the
displav
dll',
Signal
according
to
the
content
of
Ru
To
A
,nd
B register
Ru
=
"1"
dlitil/O
rqil1er
signa1
Output
ROM
pattern or
data
r
----------
I I
Rn
=
"0"
Disptly
dlt.
sign.'
Ru
)
,,-~
Roo
Ru
Roo
Input
u
(~:
I~:>o-i------O'
~~
}
"'-~
(
~
(
~
I I
:::
}
R2c1oonllOI
it--C>c>+-~I_t-<J
RIO
!3--I~~H+-t---o
RIO
L--t------
J
Set.1I
bits
to
"',.
by
reset
function.
Figure
16
Data
I/O
Block Diagram
196
r - -
'1
Input
Set.1I
bits
to
",..
I
2'
21
21
21 :
by
r
..
t
function.
L
______
J
To
A.nell
regi
.....
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