Appendix 3
Appendix 3-5
Ver.0.10
INSTRUCTION PROCESSING TIME
Appendix 3.1 Precautions about Noise
Appendix 3.1.3 Processing Analog Input Pin Wiring
Connect a resistor of about 100 to 500
Ω
( in series to the analog signal wire connecting to the
analog input pin at a position as close to the microcomputer as possible. Also, insert a capacitor of
about 100 pF between the analog input pin and AVSS pin at a position as close to the AVSS pin as
possible.
<Reasons>
The signal fed into the analog input pin (e.g., A-D converter input pin) normally is an output
signal from a sensor. In many cases, a sensor to detect changes of event is located apart from
the board on which the microcomputer is mounted, so that wiring to the analog input pin
inevitably is long. Because a long wiring serves as an antenna which draws noise into the
microcomputer, the signal fed into the analog input pin tends to be noise-ridden. Furthermore, if
the capacitor connected between the analog input pin and AVSS pin is grounded at a position
apart from the AVSS pin, noise ridding on the ground line may penetrate into the microcomputer
via the capacitor.
Figure 3.1.5 Resistor and Capacitor for Analog Signal Line
Analog
input pin
AVSS
Sensor
Noise
Micro-
computer
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 ...