SH7261 datasheet(125/1348 Pages) RENESAS

125 / 1348 page

Section 4 Clock Pulse Generator (CPG)

Rev. 2.00 Sep. 07, 2007 Page 93 of 1312

REJ09B0320-0200

4.6.2

Note on Using Crystal Resonator

Place the crystal resonator and capacitors CL1 and CL2 as close to the XTAL and EXTAL pins as

possible. In addition, to minimize induction and thus obtain oscillation at the correct frequency,

the capacitors to be attached to the resonator must be grounded to the same ground. Do not bring

wiring patterns close to these components.

CL1

CL2

EXTAL

XTAL

Signal lines prohibited

This LSI

The values for CL1 and CL2

should be determined after

consultation with the crystal

resonator manufacturer.

Note:

Reference value

CL1 = 10 to 22 pF

CL2 = 10 to 22 pF

Figure 4.3 Note on Using Crystal Resonator

4.6.3

Note on Resonator

Since various characteristics related to the resonator are closely linked to the user's board design,

thorough evaluation is necessary on the user's part, using the resonator connection examples

shown in this section as a guide. As the parameters for the oscillation circuit will depend on the

floating capacitance of the resonator and the user board, the parameters should be determined in

consultation with the resonator manufacturer. The design must ensure that a voltage exceeding the

maximum rating is not applied to the resonator pin.

SH7261 Datasheet(PDF) 125 Page - Renesas Technology Corp