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0
SENSE
This
is
the detection
signei for
panel
input.
When
a panel input
is
present,
a
low-level signal
is
output
in
syn-
chronization
with the
select signal
|C5).
@
EOC
This
signal indicates that
the
A/0
conversion
of the panel Input
has
been
completed.
A
high-level signal
is
out-
put.
A/0
conversion
starts
as
soon
as the
select signal
{^)
is
released
and
it
is
completed
in
about 160
sec.
The
EOC
signal
is
set
low
when
the
select signal
is
input,
and
it
reverts to
high
when
the
select
sigai
is
released
and
A/0
conversion
is
completed.
0
SO
When
the
select
sigrral
(CS) has
been
input,
the
8-bit
A/D
conv
erted
data
are
output
in
sequence
starting
with
the
most
significant
bit
at
the
fall
of the
serial
clock
signal
(SCR).
When
the
select signal
is
high,
the
SO
signal
Is
kept
in
the
high-level
output
state.
0
SW
This
signal Indicates
the status
of
the
tablet's
switch
or
the
status of
the switch
on
the
touch
pen.
The
wgnal
is
low
when
the switch
is
"on."
©
DC5V
This
is
the input pin
of the
OC
5V power
supply.
©
SCK
The
serial
clock
signal
controls the
shift
operation of the
serial
input/ output.
©
SI
This
serial
Input
signal specifies
the
X
and
Y
coordinates entered
from
the
panel.
A
low
signal
is
input
when
reading the
X
coordinate
and
a high
signal
is
input
when
reading the
Y
coordinate.
When
the
select signal
(C5)
is
input,
the 51 input reads
in
the coordinates
at
the 7th
and
8th
rises
of the
serial
clock
signal.
®
«
This
is
the
select
signal.
A
low
signal
is
input
with
serial
input/output.
When
it
is
high,
the
A/D
conversion
mode
is
established
and
serial
input/output
Is
inhibited.
®
GND
This
is
the
signal
ground.
It
applies
a
ground
potential to
all
the
signals.
All
input
and
output
operations are
executed
at
the
TTL
level.
Input/
output
circuitry
Output
SENSE
74I.S or equivalent
SO
EOC
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