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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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M38B53M4-059FP 데이터시트(PDF) 279 Page - Mitsubishi Electric Semiconductor |
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M38B53M4-059FP 데이터시트(HTML) 279 Page - Mitsubishi Electric Semiconductor |
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279 / 355 page  38B5 Group User’s Manual 3-31 APPENDIX 3.4 Countermeasures against noise Fig. 3.4.10 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. Note: When a direction register is set for input port again at fixed periods, a several-nanosecond short pulse may be output from this port. If this is undesirable, connect a capacitor to this port to remove the noise pulse. Direction register Port latch Data bus I/O port pins Noise Noise N.G. O.K. |
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