7545 datasheet(19/62 Pages) RENESAS

19 / 62 page

Rev.1.06

Mar 07, 2008

Page 19 of 59

REJ03B0140-0106

7545 Group

Termination of Unused Pins

1. 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).

Table 8

Termination of unused pins

Termination 1 (recommend)

Termination 2 (recommend)

P00/KEY0

−P07/KEY7

I/O port

When selecting key-on wakeup function, perform termination of input port.

P10

−P11(RLSS-only pin)

When selecting N-channel open-drain for output structure, open.

P20 (LED0)/INT0

When selecting N-channel open-drain for output structure, connect to VSS

through a resistor. Or set its port latch to “0” and open.

P21 (LED1)/INT1

When selecting N-channel open-drain for output structure, connect to VSS

through a resistor. Or set its port latch to “0” and open.

P22 (LED2)

−P27 (LED7)

When selecting N-channel open-drain for output structure, open.

P30

−P37

When selecting N-channel open-drain for output structure, open.

P40 (LED8) (RLSS-only pin)

−

P41 (LED9) (RLSS-only pin)

−

P42/CARR

When selecting CARR output function, perform termination of output port.

VDDR

Connect to VSS.

−

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