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CHAPTER 31 ELECTRICAL SPECIFICATIONS ((A2) GRADE PRODUCTS)
User’s Manual U16890EJ1V0UD
817
Main Clock Oscillator Characteristics (T
A
=
40 to +125
°
C, V
DD
= 3.5 to 5.5 V, V
SS
= 0 V)
Resonator
Recommended Circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Oscillation frequency
(f
X
)
Note 1
2
10
MHz
After reset is
released
2
15
/f
X
s
Ceramic
resonator
Oscillation
stabilization time
Note 2
After STOP mode is
released
Note 3
s
Oscillation frequency
(f
X
)
Note 1
2
10
MHz
After reset is
released
2
15
/f
X
s
Crystal
resonator
Oscillation
stabilization time
Note 2
After STOP mode is
released
Note 3
s
External
clock
X1, X2 input
frequency (f
X
)
REGC = V
DD
Duty = 50%
±
5%
2
10
MHz
Notes 1.
Indicates only oscillator characteristics.
2.
Time required to stabilize the resonator after reset or STOP mode is released.
3.
The value differs depending on the OSTS register settings.
Cautions 1. When using the main 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
SS
.
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 clock is stopped and the device is operating on the subclock, wait until the
oscillation stabilization time has been secured by the program before switching back to the
main clock.
X2
X1
External clock
X2
X1
X2
X1