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R8C2K bảng dữ liệu(PDF) 461 Page - Renesas Technology Corp

tên linh kiện R8C2K
Giải thích chi tiết về linh kiện  RENESAS MCU R8C FAMILY / R8C/2x SERIES
PDF  471 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R8C2K bảng dữ liệu(HTML) 461 Page - 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.



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