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System Clock Oscillator Characteristics
Ceramic or crystal oscillation (
(T
= –40 to +85°C, V
= 1.8 to 5.5 V)
A
DD
Resonator
Recommended Circuit
V
Ceramic resonator
SS
V
SS
Crystal resonator
External clock
X1
Notes. 1. Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
2. Time required to stabilize oscillation after reset or STOP mode release.
Caution When using a ceramic or crystal oscillator, wire as follows in the area enclosed by the broken
lines in the above figures 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
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
Remark
For the resonator selection and oscillator constant of the
either evaluate the oscillation themselves or apply to the resonator manufacturer for evaluation.
CHAPTER 20 ELECTRICAL SPECIFICATIONS
µ
PD789860, 789860(A), 78E9860A)
Parameter
X2
X1
Oscillation frequency
Note 1
(f
)
X
Oscillation
stabilization time
X2
X1
Oscillation frequency
Note 1
(f
)
X
Oscillation
stabilization time
X1 input frequency
X2
Note 1
(f
)
X
X1 input high-/low-
level width(t
,t
XH
User's Manual U14826EJ5V0UD
Conditions
V
= Oscillation
DD
voltage range
After V
reaches
DD
Note 2
oscillation voltage
range MIN.
Note 2
)
XL
µ
PD78E9860A, customers are required to
MIN.
TYP.
MAX.
1.0
5.0
MHz
4
1.0
5.0
MHz
30
1.0
5.0
MHz
85
500
.
SS
Unit
ms
ms
ns
181
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