Chapter 16
Appendix
XVI - 4 Cautions for Circuit Setup
■ Unused Pins (for I/O)
Unused I/O pins should be set according to pins’ condition at reset. If the output is high impedance (Pch / Nch
transistor: output off) at reset, to stabilize input, set some 10 kΩ resistor to pull up or down. If the output is on at
reset, set them open. Do not switch between input and output by software.
Figure:16.1.4 Unused I/O Pins (High Impedance Output at Reset)
Input
Input Input
Input
Data Data
DataData
Output OFF Output OFF
Output OFFOutput OFF
some 10 kΩ
some 10 kΩ
some 10 kΩ
some 10 kΩ
Output control
Output control
Nch
Nch
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