SH7616 Datasheet, PDF (149/935 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7600 Series

Section 3 Oscillator Circuits and Operating Modes
3.2.7 Notes on Board Design
When Using an External Crystal Oscillator: Place the crystal resonator, capacitors CL1 and
CL2, and damping resistor R close to the EXTAL and XTAL pins. To prevent induction from
interfering with correct oscillation, use a common grounding point for the capacitors connected to
the resonator, and do not locate a wiring pattern near these components.
Avoid crossing
signal lines
CL1
CL2
EXTAL
R
XTAL
Note: The values for CL1, CL2, and the damping resistance should be determined after
consultation with the crystal resonator manufacturer.
Figure 3.5 Points for Attention when Using Crystal Resonator
Bypass Capacitors: As far as possible, insert a laminated ceramic capacitor of 0.01 to 0.1 µF as a
bypass capacitor for each V_SS/V_CC pair. Mount the bypass capacitors as close as possible to the
LSI power supply pins, and use components with a frequency characteristic suitable for the LSI
operating frequency, as well as a suitable capacitance value.
V_SS/V_CC pairs
PLL system: 9-12
3 V digital system: 20-18, 26-22, 35-33, 45-42, 52-50, 60-58, 61-67, 69-66, 78-76, 79-81, 91-89,
101-99, 112-109, 113-110, 114-116, 130-132, 149-146, 150-147
5 V digital system: 157-155, 169-167, 181-179, 191-193, 202-200
Rev. 2.00 Mar 09, 2006 page 123 of 906
REJ09B0292-0200