CHAPTER 20 ELECTRICAL SPECIFICATIONS
User’s Manual U14826EJ5V0UD
183
RC oscillation (
µ
PD789861, 78E9861A)
(T
A
= –40 to +85
°
C, V
DD
= 1.8 to 3.6 V)
Resonator Recommended
Circuit Parameter
Conditions
MIN.
TYP.
MAX.
Unit
RC oscillator
CL2
CL1
Oscillation frequency
(f
CC
)
Notes 1,2
V
DD
= Oscillation
voltage range
0.85 1.15
MHz
CL1 input frequency
(f
CC
)
Note 1
1.0
5.0
MHz
External clock
CL1
CL2
CL1 input high-/low-
level width (t
XH
,t
XL
)
85
500
ns
Notes 1.
Indicates only oscillator characteristics. Refer to
AC Characteristics
for instruction execution time.
2.
Variations due to external resistance and external capacitance are not included.
Caution When using an RC oscillator, wire as follows in the area enclosed by the broken lines in the
above figure to avoid an adverse effect from wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross with other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating current flows.
• Always make the ground point of the oscillator capacitor the same potential as V
SS
.
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
Содержание PD789860
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