SH7052 datasheet(84/919 Pages) RENESAS

Il numero della parte	SH7052

Spiegazioni elettronici	SuperHTM RISC engine

PDF	919 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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Table 4.3

Damping Resistance Values (Recommended Values)

Frequency (MHz)

Parameter

Rd (

Ω)

500

Crystal Oscillator: Figure 4.4 shows an equivalent circuit of the crystal oscillator. Use a crystal

oscillator with the characteristics listed in table 4.4.

EXTAL

LRs

XTAL

Figure 4.4 Crystal Oscillator Equivalent Circuit

Table 4.4

Crystal Oscillator Parameters (Recommended Values)

Frequency (MHz)

Parameter

Rs max (

Ω)

100

C0 max (pF)

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

crystal oscillator and the chip.

4.3.2

External Clock Input Method

An example of external clock input connection is shown in figure 4.5.

When the XTAL pin is placed in the open state, the parasitic capacitance should be 10 pF or less.

Even when an external clock is input, provide for a wait of at least the oscillation settling time

when powering on or exiting standby mode in order to secure the PLL settling time.

SH7052 Scheda tecnica(PDF) 84 Page - Renesas Technology Corp