Datasheet

Section 23 Clock Pulse Generator
Rev. 3.00 Sep. 28, 2009 Page 766 of 910
REJ09B0350-0300
23.6 Usage Notes
23.6.1 Notes on Resonator
Since all kinds of characteristics of the resonator are closely related to the board design by the
user, use the example of resonator connection in this document for only reference; be sure to use
an resonator that has been sufficiently evaluated by the user. Consult with the resonator
manufacturer about the resonator circuit ratings that vary depending on the stray capacitances of
the resonator and installation circuit. Make sure the voltage applied to the oscillation pins do not
exceed the maximum rating.
23.6.2 Notes on Board Design
When using a crystal resonator, the crystal resonator and its load capacitors should be placed as
close as possible to the XTAL and EXTAL pins. Other signal lines should be routed away from
the oscillator to prevent inductive interference with correct oscillation as shown in figure 23.9.
C
L2
Signal A Signal B
C
L1
This LSI
XTAL
EXTAL
Prohibited
Figure 23.9 Note on Board Design of Oscillator Section