SH7618 Datasheet, PDF (237/646 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series

Section 8 Clock Pulse Generator (CPG)
8.6 Notes on Board Design
When Using an External Crystal Resonator: 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
This LSI
Note : Although the recommended value for CL1 and CL2 is
20pF and the recommended value for R is 0Ω, the
values should be determined after consultation with
the crystal manufacturer.
Figure 8.2 Points for Attention when Using Crystal Resonator
Bypass Capacitors: Insert a laminated ceramic capacitor as a bypass capacitor for each V_SS/V_SSQ
and V_CC/V_CCQ pair. Mount the bypass capacitors to the power supply pins, and use components
with a frequency characteristic suitable for the operating frequency of the LSI, as well as a suitable
capacitance value.
• Digital power supply pairs for internal logic
A4-B4, B11-A11, D15-D14, E2-E1, G12-G13, H4-H3, J12-J13, M1-M2, M8-N8, P5-R5
• Power supply pairs for input and output
A1-B1, A7-B7, A15-A14, F15-F14, K1-K2, M12-P14, M15-M14, R1-R2, R10-P10
• Power supply pairs for PLL
N13-N14, N13-P15
Rev. 6.00 Jun. 12, 2007 Page 205 of 610
REJ09B0131-0600