HD6432351 datasheet(714/1025 Pages) RENESAS

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Section 19 Clock Pulse Generator

Rev. 3.00 Sep 15, 2006 page 680 of 988

REJ09B0330-0300

Crystal Resonator

Figure 19.3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has

the characteristics shown in table 19.3 and the same resonance frequency as the system clock (

φ).

XTAL

AT-cut parallel-resonance type

EXTAL

LRs

Figure 19.3 Crystal Resonator Equivalent Circuit

Table 19.3 Crystal Resonator Parameters

Frequency (MHz)

RS max (

Ω

Ω)

500

120

C0 max (pF)

Note on Board Design

When a crystal resonator is connected, the following points should be noted:

Other signal lines should be routed away from the oscillator circuit to prevent induction from

interfering with correct oscillation. See figure 19.4.

When designing the board, place the crystal resonator and its load capacitors as close as possible

to the XTAL and EXTAL pins.

CL2

Signal A Signal B

CL1

H8S/2350 Group

XTAL

EXTAL

Avoid

Figure 19.4 Example of Incorrect Board Design

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