H838024 datasheet(285/697 Pages) RENESAS

Part #	H838024

Description	Renesas 8-Bit Single-Chip Microcomputer Super Low Power Series

PDF	697 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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285 / 697 page

Section 8 I/O Ports

Rev. 7.00 Mar 10, 2005 page 243 of 652

REJ09B0042-0700

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 k

Ω.

 Pull it down to V

SS with an external resistor of approximately 100 k

Ω.

 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 k

Ω.

 Set the output of the unused pin to low and pull it down to GND with an external resistor of

approximately 100 k

Ω.

H838024 Datasheet(PDF) 285 Page - Renesas Technology Corp