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38K2 Datasheet(PDF) 297 Page - Renesas Technology Corp

Part # 38K2
Description  RENESAS 8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES
PDF  358 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

38K2 Datasheet(HTML) 297 Page - Renesas Technology Corp

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3.3 Countermeasures against noise
Rev.2.00
Oct 15, 2006
page 36 of 99
38K2 Group
REJ09B0338-0200
APPENDIX
(2)
Installing oscillator away from signal lines where potential levels change frequently
Install an oscillator and a connecting pattern of an oscillator away from signal lines where potential
levels change frequently. Also, do not cross such signal lines over the clock lines or the signal lines
which are sensitive to noise.
q Reason
Signal lines where potential levels change frequently (such as the CNTR pin signal line) may affect
other lines at signal rising edge or falling edge. If such lines cross over a clock line, clock waveforms
may be deformed, which causes a microcomputer failure or a program runaway.
Fig. 3.3.9 Wiring of RESET pin
3.3.4 Oscillator concerns
Take care to prevent an oscillator that generates clocks for a microcomputer operation from being affected
by other signals.
(1)
Keeping oscillator away from large current signal lines
Install a microcomputer (and especially an oscillator) as far as possible from signal lines where a
current larger than the tolerance of current value flows.
q Reason
In the system using a microcomputer, there are signal lines for controlling motors, LEDs, and
thermal heads or others. When a large current flows through those signal lines, strong noise
occurs because of mutual inductance.
Fig. 3.3.8 Wiring for a large current signal line
XIN
XOUT
VSS
CNTR
Do not cross
N.G.
XIN
XOUT
VSS
M
Microcomputer
inductance
Large
current
GND



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