Notes On Board Design; Figure 10.4 Points For Attention When Using Crystal Resonator - Hitachi SH7751 Hardware Manual

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.
Avoid crossing signal lines
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. 3.0, 04/02, page 260 of 1064
CL1 CL2
R
EXTAL XTAL
SH7751 Series
Recommended values
CL1 = CL2 = 0–33 pF
R = 0Ω