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M38B53M4-059FP Datasheet(PDF) 275 Page - Mitsubishi Electric Semiconductor |
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M38B53M4-059FP Datasheet(HTML) 275 Page - Mitsubishi Electric Semiconductor |
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275 / 355 page  38B5 Group User’s Manual 3-27 APPENDIX 3.4 Countermeasures against noise (3) Wiring for clock input/output pins • Make the length of wiring which is connected to clock I/O pins as short as possible. • Make the length of wiring (within 20 mm) across the grounding lead of a capacitor which is connected to an oscillator and the VSS pin of a microcomputer as short as possible. • Separate the VSS pattern only for oscillation from other VSS patterns. q Reason If noise enters clock I/O pins, clock waveforms may be deformed. This may cause a program failure or program runaway. Also, if a potential difference is caused by the noise between the VSS level of a microcomputer and the VSS level of an oscillator, the correct clock will not be input in the microcomputer. Fig. 3.4.3 Wiring for clock I/O pins Noise XIN XOUT VSS XIN XOUT VSS N.G. O.K. |
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