HD64F38024HV Datasheet, PDF (267/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Section 8 I/O Ports
8.13 Application Note
8.13.1 The Management of the Un-Use Terminal
If an I/O pin not used by the user system is floating, pull it up or down.
• If an unused pin is an input pin, handle it in one of the following ways:
⎯ Pull it up to V_CC with an on-chip pull-up MOS.
⎯ Pull it up to V_CC with an external resistor of approximately 100 kΩ.
⎯ Pull it down to V_SS with an external resistor of approximately 100 kΩ.
⎯ For a pin also used by the A/D converter, pull it up to AV_CC.
• If an unused pin is an output pin, handle it in one of the following ways:
⎯ Set the output of the unused pin to high and pull it up to V_CC with an on-chip pull-up MOS.
⎯ Set the output of the unused pin to high and pull it up to V_CC with an external resistor of
approximately 100 kΩ.
⎯ Set the output of the unused pin to low and pull it down to GND with an external resistor of
approximately 100 kΩ.
Rev. 8.00 Mar. 09, 2010 Page 245 of 658
REJ09B0042-0800