SH7124 datasheet(86/774 Pages) RENESAS

Il numero della parte	SH7124

Spiegazioni elettronici	Renesas 32-Bit RISC Microcomputer SuperH??RISC engine Family

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Section 4 Clock Pulse Generator (CPG)

Rev. 4.00 Jul. 25, 2008 Page 66 of 750

REJ09B0243-0400

4.6

Oscillator

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

4.6.1

Connecting Crystal Resonator

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

listed in table 4.6. 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

CL2

CL1

CL1 = CL2 = 18 to 22 pF (Reference values)

Figure 4.2 Connection of Crystal Resonator (Example)

Table 4.6

Damping Resistance Values (Reference Values)

Frequency (MHz)

12.5

Rd (

Ω) (Reference Values)

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

characteristics listed in table 4.7.

XTAL

EXTAL

Figure 4.3 Crystal Resonator Equivalent Circuit

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