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R8C/13 Datasheet(PDF) 209 Page - Renesas Technology Corp |
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R8C/13 Datasheet(HTML) 209 Page - Renesas Technology Corp |
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209 / 224 page  R8C/13 Group 19. Usage Notes Rev.1.20 Jan 27, 2006 page 198 of 205 REJ09B0111-0120 19.8 Noise (1) Bypass Capacitor between VCC and VSS Pins Insert a bypass capacitor (at least 0.1 µF) between VCC and VSS pins as the countermeasures against noise and latch-up. The connecting wires must be the shortest and widest possible. (2) Port Control Registers Data Read Error During severe noise testing, mainly power supply system noise, and introduction of external noise, the data of port related registers may changed. As a firmware countermeasure, it is recommended to periodically reset the port registers, port direction registers and pull-up control registers. However, you should fully examine before introducing the reset routine as conflicts may be created between this reset routine and interrupt routines (i. e. ports are switched during interrupts). (3) CNVss Pin Wiring In order to improve the pin tolerance to noise, insert a pull down resistance (about 5 k Ω) between CNVss and Vss, and placed as close as possible to the CNVss pin. |
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