Appendix 3
Appendix 3-8
Ver.0.10
PRECAUTIONS ABOUT NOISE
Appendix 3.1 Precautions about Noise
Appendix 3.1.5 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 input/output ports.
Software measures
• For input ports, read out data in a program two or more times to verify that levels match.
• 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.
Noise
Direction register
Data register
Data bus
Input/output port
Noise
Figure 3.1.8 Processing Input/Output Ports
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...