R8C2K datasheet(461/471 Pages) RENESAS

Teilenummer	R8C2K

Bauteilbeschribung	RENESAS MCU R8C FAMILY / R8C/2x SERIES

PDF	471 Pages

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Hersteller	RENESAS [Renesas Technology Corp]

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R8C/2K Group, R8C/2L Group

23. Usage Notes

Rev.1.10

Dec 21, 2007

Page 444 of 450

REJ09B0406-0110

23.8

Notes on Noise

23.8.1

Inserting a Bypass Capacitor between VCC and VSS Pins as a Countermeasure

against Noise and Latch-up

Connect a bypass capacitor (at least 0.1

µF) using the shortest and thickest write possible.

23.8.2

Countermeasures against Noise Error of Port Control Registers

During rigorous noise testing or the like, external noise (mainly power supply system noise) can exceed the

capacity of the MCU's internal noise control circuitry. In such cases the contents of the port related registers

may be changed.

As a firmware countermeasure, it is recommended that the port registers, port direction registers, and pull-up

control registers be reset periodically. However, examine the control processing fully before introducing the

reset routine as conflicts may be created between the reset routine and interrupt routines.

R8C2K Datenblatt(PDF) 461 Page - Renesas Technology Corp