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Section 18 Clock Pulse Generator
Rev. 3.00 Mar. 14, 2006 Page 668 of 804
REJ09B0104-0300
18.5.2 Notes
on Resonator
Since various characteristics related to the resonator are closely linked to the user's board design,
thorough evaluation is necessary on the user's part, using the resonator connection examples
shown in this section as a reference. As the parameters for the resonator will depend on the
floating capacitance of the resonator and the mounting circuit, the parameters should be
determined in consultation with the resonator manufacturer. The design must ensure that a voltage
exceeding the maximum rating is not applied to the resonator pin.
18.5.3
Notes on Board Design
When using the crystal resonator, place the crystal resonator and its load capacitors as close as
possible to the XTAL and EXTAL pins. Other signal lines should be routed away from the
oscillation circuit as shown in figure 18.6 to prevent induction from interfering with correct
oscillation.
C
L2
Signal A Signal B
C
L1
This LSI
XTAL
EXTAL
Inhibited
Figure 18.6 Note on Board Design for Oscillation Circuit
Figure 18.7 shows a connection example of bypass capacitor. Please be sure to insert bypass
capacitor (CB) close to the Vcc and Vss pins and its capacitance meets the characteristics of the
user system board.
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