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Appendix 3
Appendix 3.1.4 Consideration about the Oscillator
The oscillator that generates the fundamental clock for microcomputer operation requires
consideration to make it less susceptible to influences from other signals.
(1) Avoidance from large-current signal lines
Signal lines in which a large current flows exceeding the range of current values that the
microcomputer can handle must be routed as far away from the microcomputer (especially the
oscillator) as possible.
<Reasons>
Systems using the microcomputer contain signal lines to control, for example, a motor, LED,
and thermal head. When a large current flows in these signal lines, it generates noise due to
mutual inductance.
Figure 3.1.6 Wiring of Large-current Signal Lines
Mutual inductance
M
Large current
GND
Appendix 3-6
PRECAUTIONS ABOUT NOISE
Appendix 3.1 Precautions about Noise
Microcomputer
XIN
XOUT
VSS
Ver.0.10
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