7549 datasheet(21/86 Pages) RENESAS

21 / 86 page

Rev.2.02

Mar 31, 2009

Page 19 of 81

REJ03B0202-0202

7549 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).

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.

Table 7

Termination of unused pins

Termination

P00/INT0

Perform termination of I/O port.

P01/INT1

P02

P03

P04/RXD

P05/TXD

P06/SCLK

P07/SRDY

P10/AN0/KEY0/CMP0

P11/AN1/KEY1/CMP1

P12/AN2/KEY2/CMP2

P13/AN3/KEY3/T2OUT

P14/AN4/KEY4

P15/AN5/KEY5

P16/AN6/KEY6

P17/AN7/KEY7

P20/XOUT/XCOUT

Set the direction register to “1”,

and perform termination of output

port.

P21/XIN/XCIN

Perform termination of I/O port.

P30

P31

RESET

To use the built-in power-on reset

circuit, leave the RESET pin open.

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