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CHAPTER 22 ELECTRICAL SPECIFICATIONS (
Main System Clock Oscillator Characteristics (T
Resonator
Recommended Circuit
V
X1
Ceramic
SS
resonator
C1
C2
V
X1
Crystal
SS
resonator
C1
C2
External
X1
clock
X1
OPEN
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.
Cautions 1. When using the main system clock 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 the wiring with the 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.
2. When the main system clock is stopped and the device is operating on the subsystem clock,
wait until the oscillation stabilization time has been secured by the program before switching
back to the main system clock.
Remark
For the resonator selection and oscillator constant, customers are required to either evaluate the
oscillation themselves or apply to the resonator manufacturer for evaluation.
344
= –40 to +85°C, V
A
Parameter
X2
Oscillation frequency (f
Oscillation stabilization
Note 2
time
X2
Oscillation frequency(f
Oscillation stabilization
Note 2
time
X1 input frequency (f
X2
X
X1 input high-/low-level width
(t
, t
)
XH
XL
X1 input frequency (f
X2
X
X1 input high-/low-level width
(t
, t
)
XH
XL
User's Manual U15331EJ4V1UD
µ
PD789488, 78F9488, 789489, 78F9489)
= 1.8 to 5.5 V)
DD
Conditions
Note 1
)
X
After V
reaches
DD
oscillation voltage
range MIN.
Note 1
)
X
V
= 4.5 to 5.5 V
DD
V
= 1.8 to 5.5 V
DD
Note 1
)
Note 1
)
V
= 2.7 to 5.5 V
DD
V
= 2.7 to 5.5 V
DD
MIN.
TYP.
MAX.
1.0
5.0
4
1.0
5.0
10
30
1.0
5.0
85
500
1.0
5.0
85
500
.
SS
Unit
MHz
ms
MHz
ms
ms
MHz
ns
MHz
ns
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