HD6417618 datasheet(237/646 Pages) RENESAS

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Section 8 Clock Pulse Generator (CPG)

Rev. 6.00 Jun. 12, 2007 Page 205 of 610

REJ09B0131-0600

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.

EXTAL

XTAL

This LSI

Avoid crossing

signal lines

CL1

CL2

Note : Although the recommended value for CL1 and CL2 is

20pF and the recommended value for R is 0

Ω, 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/VSSQ

and V

CC/VCCQ 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

HD6417618 Datasheet(PDF) 237 Page - Renesas Technology Corp