3823 datasheet(21/76 Pages) RENESAS

Part #	3823

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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21 / 76 page

Rev.2.02

Jun 19, 2007

page 21 of 73

REJ03B0146-0202

3823 Group

Termination of unused pins

• Termination of common pins

I/O ports:

Select an input port or an output port and follow

each processing method.

Output ports: Open.

Input ports: If the input level become unstable, through current

flow to an input circuit, and the power supply current

may increase.

Especially, when expecting low consumption current

(at STP or WIT instruction execution etc.), pull-up or

pull-down input ports to prevent through current

(built-in resistor can be used). Pull-down the P40/

(VPP) pin.

We recommend processing unused pins through a

resistor which can secure IOH(avg) or IOL(avg).

Because, when an I/O port or a pin which have an

output function is selected as an input port, it may

operate as an output port by incorrect operation etc.

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