SH7047 datasheet(92/764 Pages) RENESAS

Part #	SH7047

Description	Renesas 32-Bit RISC Microcomputer SuperHTMRISC engine Family/SH7000 Series

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Manufacturer	RENESAS [Renesas Technology Corp]

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92 / 764 page

Rev. 2.00, 09/04, page 52 of 720

4.1

Oscillator

Clock pulses can be supplied from a connected crystal resonator or an external clock.

4.1.1

Connecting a Crystal Resonator

Circuit Configuration: A crystal resonator can be connected as shown in figure 4.2. Use the

damping resistance (Rd) listed in table 4.1. Use an AT-cut parallel-resonance type crystal

resonator that has a resonance frequency of 4 to 12.5 MHz. It is recommended to consult crystal

dealer concerning the compatibility of the crystal resonator and the LSI.

EXTAL

XTAL

Rd

CL2

CL1

CL1 = CL2 = 18–22 pF (Recommended value)

Figure 4.2 Connection of the Crystal Resonator (Example)

Table 4.1

Damping Resistance Values

Frequency (MHz)

4

8

10

12.5

Rd (

Ω)

500

200

0

Crystal Resonator: Figure 4.3 shows an equivalent circuit of the crystal resonator. Use a crystal

resonator with the characteristics listed in table 4.2.

XTAL

AT-cut parallel-resonance type

CL

EXTAL

C0

L

Rs

Figure 4.3 Crystal Resonator Equivalent Circuit

Table 4.2

Crystal Resonator Characteristics

Frequency (MHz)

4

8

10

12.5

Rs max (

Ω)

120

80

60

50

C0 max (pF)

7

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