Appendix 3
Appendix 3-2
Ver.0.10
PRECAUTIONS ABOUT NOISE
Appendix 3.1 Precautions about Noise
Appendix 3.1 Precautions about Noise
The following describes precautions to be taken about noise and corrective measures against
noise. The corrective measures described here are theoretically effective for noise, but require that
the application system with these measures incorporated be fully evaluated before it can actually
be put to use.
Appendix 3.1.1 Reduction of Wiring Length
Wiring on the board may serve as an antenna to draws noise into the microcomputer. Shorter the
total wiring length, the smaller the possibility of drawing noise into the microcomputer.
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(1) Wiring of the RESET pin
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Reduce the length of wiring connecting to the RESET pin. Especially when connecting a
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capacitor between the RESET and VSS pins, make sure it is connected to each pin with the
shortest possible wiring (within 20 mm).
<Reasons>
Reset is a function to initialize the internal logic of the microcomputer. The pulse width applied
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to the RESET pin is important and is therefore stipulated as part of timing requirements. If
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noise in pulse width shorter than the stipulated duration is applied to the RESET pin, reset will
be negated before the internal logic of the microcomputer is fully initialized, causing the
program to go wild.
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Figure 3.1.1 Wiring of the RESET Pin
RESET
Reset
circuit
Noise
VSS
VSS
Reset
circuit
VSS
RESET
VSS
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 ...