----------------------------------------------------------------LCD-IV
8.
Applied
to
external
clock
operation. (system
clock)
9.
Applied
to
internal
clock
operation
using resistor R
f
.
(System Clock)
[(
SCI
Rf
OSC.
Wiring
of
OSC
I
and OSC. terminals should be
as
short
as
possible because the oscillation frequency
is
modified
by
capaci-
tance
of
these terminals.
10. Power supply
condition
Vee;:;:'
VI
;;;:.
V.
,;;:,
V3
';;:'GND should be maintained.
__
11.
Applied
to
input
pins, 1/0
common
pins among 0 and R terminals, and RESET,
HL
T,
OSC
I
,
INT.,
INTI
pins.
12. Lower
limit
of
operation frequency
is
determined
by
liquid
crystal display
duty.
Flutter
occurs on
liquid
crystal display
if
frame frequency
is
under 32 Hz. Therefore
operation
frequency should be
determined
to
prevent
that
frame frequency
becomes under
32 Hz.
The
following
shows the relation between
liquid
crystal display frame frequency and
operation
frequency.
1000
500
N
:
10
0
E
f
u.
5
0
~
~
Frame Frequency
is
Lower
limit
0
10
~
/
/
V
/
~
/
/ / /
/
//
~
)~
V
~I.I
~i;'
~
50
100
Operation Frequency f
cp
, fosc (kHz)
"
Static
1/
1
V1
VI/1
500
12
duty
13
d~ty
14
duty
13. INTo and
INTI
inputs
must
be retained
for
two
or
more
instruction
cycle
time
at
both
"High"
and
"Low"
levels.
183
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