Usage Notes; Notes On Resonator; Notes On Board Design - Renesas H8S/2100 Series Hardware Manual

Section 25 Clock Pulse Generator
25.6

Usage Notes

25.6.1

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.
25.6.2

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 25.9.
Figure 25.9 Note on Board Design of Oscillator Section
Rev. 1.00 Apr. 28, 2008 Page 840 of 994
REJ09B0452-0100
Signal A
Prohibited
C
L2
C
L1
Signal B
This LSI
XTAL
EXTAL