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7733 Datasheet(PDF) 615 Page - Renesas Technology Corp

Part # 7733
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  940 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7733 Datasheet(HTML) 615 Page - Renesas Technology Corp

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7733 Group User’s Manual
21-67
APPENDIX
4. Oscillator protection
The oscillator, which generates the basic clock for
the microcomputer operations, must be protected
from the affect of other signals.
(1) Distance oscillator from signal lines with
large current flows
q Install the microcomputer, especially the
oscillator, as far as possible from signal lines
which handle currents larger than the
microcomputer current value tolerance.
Reason
The microcomputer is used in systems which
contain signal lines for controlling motors, LEDs,
thermal heads, etc. Noise occurs due to mutual
inductance when a large current flows through
the signal lines.
(2) Distance oscillator from signal lines with
frequent potential level changes
q Install an oscillator and a connecting pattern
away from signal lines in which potential levels
change frequently.
q Do not cross these signal lines over clock-
related or noise-sensitive signal lines.
Reason
Signal lines with frequently changing potential
levels may affect other signal lines at the rising
or falling edge. In particular, if the lines cross
over a clock-related signal line, clock waveforms
may
be
deformed,
which
causes
a
microcomputer malfunction or a program
runaway.
Fig. 19 Wiring for signal lines with large current
flows
Fig. 20 Wiring for signal lines with frequent
potential level changes
XIN
XOUT
Vss
M
M37733MHBXXXFP
Mutual inductance
Large
current
GND
XIN
XOUT
Vss
g
Do not cross.
g I/O pin for signal with frequently changing
potential levels.
M37733MHBXXXFP
Appendix 8. Countermeasure examples against noise



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