SH7243 datasheet(118/1726 Pages) RENESAS

Part #	SH7243

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

PDF	1726 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 4 Clock Pulse Generator (CPG)

Rev. 1.00 Jun. 26, 2008 Page 88 of 1692

REJ09B0393-0100

4.6

Oscillator

The source of click supply can be selected from a connected crystal resonator or an external clock

input through a pin.

4.6.1

Connecting Crystal Resonator

A crystal resonator can be connected as shown in figure 4.2. Use the damping resistance (R

shown in table 4.5. Use a crystal resonator that has a resonance frequency of 10 to 12.5 MHz.

It is recommended to consult the crystal resonator manufacturer concerning the compatibility of

the crystal resonator and the LSI.

EXTAL

XTAL

L1 = CL2 = 18 to 22 pF (reference value)

Figure 4.2 Example of Crystal Resonator Connection

Table 4.5

Damping Resistance Values (Reference Values)

Frequency (MHz)

12.5

d (Ω) (reference value)

Figure 4.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator with the

characteristics shown in table 4.6.

EXTAL

XTAL

Figure 4.3 Crystal Resonator Equivalent Circuit

SH7243 Datasheet(PDF) 118 Page - Renesas Technology Corp