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
_____________
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
Содержание M32170F3VFP
Страница 19: ...CHAPTER 1 CHAPTER 1 OVERVIEW 1 1 Outline of the 32170 1 2 Block Diagram 1 3 Pin Function 1 4 Pin Layout ...
Страница 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Страница 56: ...2 2 14 Ver 0 10 This is a blank page ...
Страница 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Страница 192: ...6 6 58 Ver 0 10 INTERNAL MEMORY 6 9 Precautions to Be Taken When Rewriting Flash Memory This is a blank page ...
Страница 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Страница 498: ...10 10 228 Ver 0 10 MULTIJUNCTION TIMERS 10 9 TOM Output related 16 bit Timer This is a blank page ...
Страница 550: ...11 11 52 Ver 0 10 A D CONVERTERS 11 4 Precautions on Using A D Converters This is a blank page ...
Страница 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Страница 710: ...14 14 16 Ver 0 10 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 746: ...16 16 20 Ver 0 10 WAIT CONTROLLER 16 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 757: ...CHAPTER 18 CHAPTER 18 OSCILLATION CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit ...
Страница 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Страница 798: ...19 19 36 Ver 0 10 JTAG 19 6 Precautions about Board Design when Connecting JTAG This is a blank page ...
Страница 830: ...21 21 24 Ver 0 10 PRELIMINARY PRELIMINARY This is a blank page ELECTRICAL CHARACTERISTICS 21 5 AC Characteristics ...
Страница 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Страница 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 837: ...Appendix 2 1 32170 Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...