SH7243 datasheet(121/1726 Pages) RENESAS

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Section 4 Clock Pulse Generator (CPG)

Rev. 1.00 Jun. 26, 2008 Page 91 of 1692

REJ09B0393-0100

4.8

USB Operating Clock (48 MHz)

Connection of a ceramic resonator for USB, input of an external 48-MHz clock signal, and

selection of the internal CPG are available as methods for supplying the USB operating clock.

4.8.1

Connecting a Ceramic Resonator

Figure 4.5 shows an example of the connections for a ceramic resonator.

Ceramic

resonator

USBEXTAL

USBXTAL

Ceramic resonator: CSTCZ48M0X11R***-RD

(Murata Manufacturing Co., Ltd.)

Contact your Renesas Technology sales agency for detailes

of Rf and Rd values.

Ta =

−30 to +85 °C

Note:

*** represents a three-digit alphanumeric which express " Individual Specification".

Since the frequency for USB requires high accuracy, the official product name will be

decided to match the frequency after evaluation of oscillation on the board that is

actually to be used.

Please contact your Renesas Technology sales agency.

Figure 4.5 Example of Connecting a Ceramic Resonator

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