HD6432138SW datasheet(726/1061 Pages) RENESAS

Part #	HD6432138SW

Description	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1061 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 23 Clock Pulse Generator

Rev. 4.00 Jun 06, 2006 page 672 of 1004

REJ09B0301-0400

23.3

Oscillator

Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.

23.3.1

Connecting a Crystal Resonator

Circuit Configuration: A crystal resonator can be connected as shown in the example in figure

23.2. Select the damping resistance R

d according to table 23.2. An AT-cut parallel-resonance

crystal should be used.

EXTAL

XTAL

CL2

CL1

CL1 = CL2 = 10 to 22pF

Figure 23.2 Connection of Crystal Resonator (Example)

Table 23.2

Damping Resistance Value

Frequency (MHz)

24810

d (Ω)

500

200

0000

Crystal resonator: Figure 23.3 shows the equivalent circuit of the crystal resonator. Use a crystal

resonator that has the characteristics shown in table 23.3 and the same frequency as the system

clock (

φ).

XTAL

AT-cut parallel-resonance type

EXTAL

LRs

Figure 23.3 Crystal Resonator Equivalent Circuit

HD6432138SW Datasheet(PDF) 726 Page - Renesas Technology Corp