SH-2 datasheet(83/919 Pages) RENESAS

номер детали	SH-2

подробное описание детали	SuperHTM RISC engine

PDF	919 Pages

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производитель	RENESAS [Renesas Technology Corp]

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Input clock (EXTAL pin)

System clock (CK pin)

Internal clock (

φ)

Peripheral clock (P

φ)

Figure 4.2 Input Clock and System Clock

4.3

Clock Source

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

4.3.1

Connecting a Crystal Oscillator

Circuit Configuration: Figure 4.3 shows an example of connecting a crystal resonator. Use the

damping resistance (Rd) shown in table 4.3. An AT-cut parallel-resonance type crystal resonator

should be used. Load capacitors (CL1, CL2) must be connected as shown in the figure.

The clock pulses generated by the crystal resonator and internal oscillator are sent to the PLL

multiplier circuit, where a multiplied frequency is selected and supplied inside the

SH7052F/SH7053F/SH7054F chip and to external devices.

The crystal oscillator manufacturer should be consulted concerning the compatibility between the

crystal oscillator and the chip.

XTAL

EXTAL

CL2

CL1

CL1 = CL2 = 18 to 22 pF (recommended value)

Figure 4.3 Connection of Crystal Oscillator (Example)

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