Hardware manual

Microcomputer Technical Q&A

Q&A No.: QAH8S-054

Category: Pins

Subject: Handling of Unused Pins

Question

How should unused pins be handled?

Answer

For I/O ports and input ports, clear the DDR (data direction register) bits to 0 to set the input state,

and pull each pin up or down individually with a resistance of approximately 10 k .

Applicable Products

Applicability Series Applicability Series Applicability Series

Yes Entire H8S Series H8S/2655 H8S/2350

H8S/2355 H8S/2357 H8S/2345

H8S/2245 H8S/2148 H8S/2144

H8S/2138 H8S/2134 H8S/2128

H8S/2124 — — — —