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M38041FFHKP датащи(PDF) 338 Page - Renesas Technology Corp

номер детали M38041FFHKP
подробное описание детали  8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES
PDF  387 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M38041FFHKP датащи(HTML) 338 Page - Renesas Technology Corp

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3-48
REJ09B0212-0100Z
Rev.1.00
Jan 14, 2005
3804 Group (Spec.H)
APPENDIX
3.4 Countermeasures against noise
Fig. 3.4.9 Setup for I/O ports
3.4.5 Setup for I/O ports
Setup I/O ports using hardware and software as follows:
<Hardware>
• Connect a resistor of 100
Ω or more to an I/O port in series.
<Software>
• As for an input port, read data several times by a program for checking whether input levels are
equal or not.
• As for an output port, since the output data may reverse because of noise, rewrite data to its port
latch at fixed periods.
• Rewrite data to direction registers and pull-up control registers at fixed periods.
(3)
Oscillator protection using VSS pattern
As for a two-sided printed circuit board, print a VSS pattern on the underside (soldering side) of the
position (on the component side) where an oscillator is mounted.
Connect the VSS pattern to the microcomputer VSS pin with the shortest possible wiring. Besides,
separate this VSS pattern from other VSS patterns.
Fig. 3.4.8 VSS pattern on the underside of an oscillator
XIN
XOUT
VSS
An example of VSS patterns on the
underside of a printed circuit board
Oscillator wiring
pattern example
Separate the VSS line for oscillation from other VSS lines
Direction register
Port latch
Data bus
I/O port
pins
Noise
Noise
N.G.
O.K.



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