M38B53M4-059FP datasheet(275/355 Pages) MITSUBISHI

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M38B53M4-059FP 데이터시트(PDF) 275 Page - Mitsubishi Electric Semiconductor

부품명	M38B53M4-059FP

상세설명	8-BIT SINGLE-CHIP MICROCOMPUTER

PDF	355 Pages

Scroll/Zoom	100%

제조업체	MITSUBISHI [Mitsubishi Electric Semiconductor]

홈페이지	http://www.mitsubishichips.com

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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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