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Appendix 3
(2) Avoiding effects of rapidly level-changing signal lines
Locate signal lines whose levels change rapidly as far away from the oscillator as possible. Also,
make sure rapidly level-changing signal lines will not intersect clock-related signal lines and other
noise-sensitive signal lines.
<Reasons>
Rapidly level-changing signal lines tend to affect other signal lines as their voltage level
frequently rises and falls. Especially if they intersect clock-related signal lines, they will cause
the clock waveform to become distorted, which may result in the microcomputer operating
erratically or getting out of control.
Figure 3.1.7 Wiring of Rapidly Level-changing Signal Lines (i = 0 to 3)
High-speed serial I/O
High-speed timer input/output, etc.
Do not intersect
signal lines
XIN
XOUT
VSS
Appendix 3-7
INSTRUCTION PROCESSING TIME
Appendix 3.1 Precautions about Noise
Ver.0.10
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