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7733 Datasheet(PDF) 617 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) 617 Page - Renesas Technology Corp

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7733 Group User’s Manual
21-69
APPENDIX
5. Setup for I/O ports
Setup for I/O ports is follows:
<Hardware>
qConnect a resistor of 100
Ω or more to an I/O port
in series.
<Software>
q Read the data of an input port several times to
confirm that input levels are equal.
q Periodically rewrite data to the output port’s Pi
register, as the data may reverse due to noise.
q Rewrite data to port Pi direction registers
periodically.
Noise
Direction register
Port latch
Data bus
Port
Fig. 22 Setup for I/O ports
Appendix 8. Countermeasure examples against noise



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