H8SLASH3028F datasheet(657/923 Pages) RENESAS

Part #	H8/3028F

Description	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

PDF	923 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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657 / 923 page

Rev. 2.00, 09/03, page 627 of 890

Crystal Resonator: Figure 19.3 shows an equivalent circuit of the crystal resonator. The crystal

resonator should have the characteristics listed in table 19.2.

XTAL

LRs

EXTAL

AT-cut parallel-resonance type

Figure 19.3 Crystal Resonator Equivalent Circuit

Table 19.2 Crystal Resonator Parameters

Frequency f (MHz)

Rs max (

Ω)

500

120

Co max (pF)

Use a crystal resonator with a frequency equal to the system clock frequency (

φ).

Notes 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 the board is designed, the crystal resonator and its load capacitors should be placed as close

as possible to the XTAL and EXTAL pins.

XTAL

EXTAL

C L2

C L1

H8/3028 Group chip

Avoid

Signal A

Signal B

Figure 19.4 Oscillator Circuit Block Board Design Precautions

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