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----------------------------------------------------------------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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