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Caution
When using the X1 oscillator and XT1 oscillator, wire as follows in the area enclosed by the
broken lines in the Figures 5-10 and 5-11 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
ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
Note that the XT1 oscillator is designed as a low-amplitude circuit for reducing power
consumption.
Figure 5-12 shows examples of incorrect resonator connection.
Figure 5-12. Examples of Incorrect Resonator Connection (1/2)
(a) Too long wiring
V
SS
Remark When using the subsystem clock, replace X1 and X2 with XT1 and XT2, respectively. Also, insert
resistors in series on the XT2 side.
CHAPTER 5 CLOCK GENERATOR
X1
X2
User's Manual U17854EJ9V0UD
(b) Crossed signal line
PORT
V
X1
X2
SS
. Do not
SS
157
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