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R8C/15 Datasheet(PDF) 260 Page - Renesas Technology Corp |
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R8C/15 Datasheet(HTML) 260 Page - Renesas Technology Corp |
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260 / 277 page  R8C/14 Group, R8C/15 Group 20. Precautions Rev.2.10 Jan 19, 2006 Page 248 of 253 REJ09B0164-0210 20.9 Noise 20.9.1 Insert a bypass capacitor between VCC and VSS pins as the countermeasures against noise and latch-up Connect the bypass capacitor (at least 0.1 µF) using the shortest and thickest as possible. 20.9.2 Countermeasures against Noise Error of Port Control Registers During severe noise testing, mainly power supply system noise, and introduction of external noise, the data of port related registers may be changed. As a firmware countermeasure, it is recommended to periodically reset the port registers, port direction registers and pull-up control registers. However, examine fully before introducing the reset routine as conflicts may be created between this reset routine and interrupt routines. |
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