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32186 Datasheet(PDF) 1029 Page - Renesas Technology Corp |
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32186 Datasheet(HTML) 1029 Page - Renesas Technology Corp |
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1029 / 1032 page  SUMMARY OF PRECAUTIONS Appendix 4 Appendix 4-39 32185/32186 Group Hardware Manual Rev.1.10 REJ09B0235-0110 May 15, 07 Appendix 4.16 Notes on Noise Appendix 4.16.5 Processing Input/Output Ports For input/output ports, take the appropriate measures in both hardware and software following the procedure described below. Hardware measures • Insert resistors of 100 Ω or more in series to the input/output ports. Software measures • For input ports, read out data in a program two or more times to verify that the levels coincide. • For output ports, rewrite the data register at certain intervals because there is a possibility of the output data being inverted by noise. • Rewrite the direction register at certain intervals. Appendix Figure 4.16.10 Example Processing of Input/Output Ports Noise Direction register Data register Data bus Input/output port Noise |
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