7733 datasheet(618/940 Pages) RENESAS

tên linh kiện	7733

Giải thích chi tiết về linh kiện	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	940 Pages

Scroll/Zoom	100%

nhà sản xuất	RENESAS [Renesas Technology Corp]

Trang chủ	http://www.renesas.com

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618 / 940 page

7733 Group User’s Manual

21-70

APPENDIX

6. Reinforcement of the power source line

q For the Vss and Vcc lines, use thicker wiring than that of other signal lines.

q When using a multilayer printed circuit board, the Vss pattern and the Vcc pattern must each be one

of the middle layers.

q The following is necessary for double-sided printed circuit boards:

• On one side, the microcomputer is installed at the center, and the Vss line is looped or meshed around

it. The vacant area is filled with the Vss line.

• On the opposite side, the Vcc line is wired the same as the Vss line.

• The power source lines of external devices which are connected by bus to the microcomputer must

be connected to the microcomputer’s power source lines with the shortest possible wiring.

Reasons

With external devices connected to the microcomputer, the levels of many of the signal lines (total

external address buses: 24 bits) may change simultaneously, causing noise on the power source line.

Appendix 8. Countermeasure examples against noise

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