SH7261 Datasheet, PDF (125/1348 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 4 Clock Pulse Generator (CPG)
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.
Signal lines prohibited
CL1
CL2
Reference value
CL1 = 10 to 22 pF
CL2 = 10 to 22 pF
EXTAL
XTAL
This LSI
Note:
The values for CL1 and CL2
should be determined after
consultation with the crystal
resonator manufacturer.
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.
Rev. 2.00 Sep. 07, 2007 Page 93 of 1312
REJ09B0320-0200