7546 datasheet(21/95 Pages) RENESAS

21 / 95 page

Rev.1.21

Nov 15, 2006

page 21 of 93

REJ03B0160-0121

7546 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.

P00/CAP0

P01/CMP0

P02/CMP1

P03/TXOUT

P04/RxD2

P05/TxD2

P06/SCLK2

P07/SRDY2

P10/RxD1/CAP0

P11/TxD1

P12/SCLK1

P13/SRDY1

P14/CNTR0

P20/AN0–P25/AN5

P30/CAP1

P31/CMP2

P32/CMP3

P33/INT1

P34

P37/INT0

VREF

Termination 1

(recommend)

I/O port

Connect to Vss.

Termination 2

When selecting CAP function,

perform termination of input port.

When selecting CMP0 function,

perform termination of output port.

When selecting CMP1 function,

perform termination of output port.

When selecting TXOUT function,

perform termination of output port.

When selecting RxD2 function,

perform termination of input port.

When selecting TxD2 function,

perform termination of output port.

When selecting external clock input,

perform termination of output port.

When selecting SRDY2 function,

perform termination of output port.

When selecting RxD1 function,

perform termination of input port.

When selecting TxD1 function,

perform termination of output port.

When selecting external clock input,

perform termination of input port.

When selecting SRDY1 function,

perform termination of output port.

When selecting CNTR input function,

perform termination of input port.

When selecting AN function,

perform termination of input port.

When selecting CAP function,

perform termination of input port.

When selecting CMP2 function,

perform termination of output port.

When selecting CMP3 function,

perform termination of output port.

When selecting INT function,

perform termination of input port.

When selecting INT function,

perform termination of input port.

Termination 3

When selecting internal clock output,

perform termination of output port.

When selecting CAP function, per-

form termination of input port.

When selecting internal clock output,

perform termination of output port.

When selecting CNTR output function,

perform termination of output port.

Termination 4

When selecting key-on

wakeup function, perform

termination of input port.

Table 7 Termination of unused pins

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.

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