SH7751 Datasheet, PDF (385/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

10. Clock Oscillation Circuits
10.10 Notes on Board Design
When Using a Crystal Resonator: Place the crystal resonator and capacitors close to the EXTAL
and XTAL pins. To prevent induction from interfering with correct oscillation, ensure that no
other signal lines cross the signal lines for these pins.
CL1
CL2
Avoid crossing signal lines
R
EXTAL XTAL
Recommended values
CL1 = CL2 = 0–33 pF
R=0Ω
SH7751
SH7751R
Note: The values for CL1, CL2, and the damping resistance should be determined after
consultation with the crystal resonator manufacturer.
Figure 10.4 Points for Attention when Using Crystal Resonator
When Inputting External Clock from EXTAL Pin: Make no connection to the XTAL pin.
Rev.4.00 Oct. 10, 2008 Page 287 of 1122
REJ09B0370-0400