PRECAUTIONS ABOUT NOISE
Appendix 3.1 Precautions about Noise
Appendix 3
Appendix 3-2
Rev.1.0
RESET
Reset
circuit
Noise
VSS
VSS
Reset
circuit
VSS
RESET
VSS
____________
Figure 3.1.1 Wiring of the RESET Pin
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.
____________
(1) Wiring of the RESET pin
_____________
Reduce the length of wiring connecting to the RESET pin. Especially when connecting a
_____________
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 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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Страница 20: ... This is a blank page 16 ...
Страница 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Страница 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Страница 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Страница 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Страница 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Страница 240: ...8 8 40 Rev 1 0 This is a blank page INPUT OUTPUT PORTS AND PIN FUNCTIONS 8 5 Precautions on Input Output Ports ...
Страница 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Страница 416: ...10 10 118 Rev 1 0 This is a blank page INPUT OUTPUT TIMERS 10 6 TOM Output Related 16 bit Timers ...
Страница 658: ...14 14 16 Rev 1 0 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 718: ...16 16 16 Rev 1 0 This is a blank page D A CONVERTERS 16 3 Functional Description of the D A Converters ...
Страница 766: ...18 18 22 Rev 1 0 WAIT CONTROLLER 18 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 777: ...CHAPTER 20 CHAPTER 20 OSCILLATION CIRCUIT 20 1 Oscillator Circuit 20 2 Clock Generator Circuit ...
Страница 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Страница 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Страница 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Страница 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 861: ...Appendix 2 1 M32R E Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...