Notes On Noise; Inserting A Bypass Capacitor Between Vcc And Vss Pins As A Countermeasure Against Noise And Latch-Up; Countermeasures Against Noise Error Of Port Control Registers - Renesas R8C Series User Manual
16-bit single-chip microcomputer
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Also See for R8C Series:
- User manual (51 pages) ,
- Hardware manual (257 pages) ,
- Hardware manual (197 pages)
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R8C/1A Group, R8C/1B Group
20.8
Notes on Noise
20.8.1
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 wire possible.
20.8.2
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 will 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.
Rev.1.30
Dec 08, 2006
REJ09B0252-0130
Page 308 of 315
20. Usage Notes
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