SH7124 datasheet(87/774 Pages) RENESAS

Part #	SH7124

Description	Renesas 32-Bit RISC Microcomputer SuperH??RISC engine Family

PDF	774 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 4 Clock Pulse Generator (CPG)

Rev. 4.00 Jul. 25, 2008 Page 67 of 750

REJ09B0243-0400

Table 4.7

Crystal Resonator Characteristics

Frequency (MHz)

12.5

Rs Max. (

Ω) (Reference Values) 60

C0 Max. (pF) (Reference Values)

4.6.2

External Clock Input Method

Figure 4.4 shows an example of an external clock input connection. In this case, make the external

clock high level to stop it when in software standby mode. During operation, make the external

input clock frequency 10 to 12.5 MHz.

When leaving the XTAL pin open, make sure the parasitic capacitance is less than 10 pF.

Even when inputting an external clock, be sure to wait at least the oscillation stabilization time in

power-on sequence or in releasing software standby mode, in order to ensure the PLL stabilization

time.

EXTAL

XTAL

External clock input

Open state

Figure 4.4 Example of External Clock Connection

SH7124 Datasheet(PDF) 87 Page - Renesas Technology Corp