Appendix 3
Appendix 3-3
Ver.0.10
INSTRUCTION PROCESSING TIME
Appendix 3.1 Precautions about Noise
(2) Wiring of clock input/output pins
Reduce the length of wiring connecting to the clock input/output pins. When connecting a
capacitor to the oscillator, make sure its ground lead wire and the VSS pin on the microcomputer
are connected with the shortest possible wiring (within 20 mm). Also, make sure the VSS pattern
for clock oscillation is used for only the oscillator circuit and is separated from other VSS patterns.
<Reasons>
The microcomputer operates synchronously with the clock generated by the oscillator circuit.
Inclusion of noise on clock input/output pins causes the clock waveform to become distorted,
which may result in the microcomputer operating erratically or getting out of control. Also, if a
noise-induced potential difference exists between the microcomputer's VSS level and the
oscillator's VSS level, the clock fed into the microcomputer may not be an exact clock.
Figure 3.1.2 Wiring of Clock Input/Output Pins
(3) Wiring of operation mode setup pins
When connecting operation mode setup pins and the VCC or VSS pin, make sure they are
connected with the shortest possible wiring.
<Reasons>
The levels of operation mode setup pins affect the microcomputer's operation mode. When
connecting operation mode setup pins and the VCC or VSS pin, be careful that no noise-
induced potential difference will exist between operation mode setup pins and the VCC or
VSS pin. This is because the presence of such a potential difference makes operation mode
instable, which may result in the microcomputer operating erratically or getting out of control.
Figure 3.1.3 Example for Wiring of MOD0 and MOD1 Pins
XIN
XOUT
VSS
XIN
XOUT
VSS
Noise
VSS
Operation mode
setup pins
VSS
Noise
Operation mode
setup pins
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 ...