UPD78044F datasheet(14/66 Pages) NEC

14 / 66 page

µPD78F0034A, 78F0034AY

Data Sheet U14040EJ4V0DS

3.3 Pin I/O Circuits and Recommended Connection of Unused Pins

The input/output circuit type of each pin and recommended connection of unused pins are shown in Table 3-1.

For the input/output configuration of each type, refer to Figure 3-1 .

Table 3-1. Types of Pin I/O Circuits (1/2)

Pin Name

I/O Circuit Type

I/O

Recommended Connection of Unused Pins

P00/INTP0

8-C

I/O

Input: Independently connect to VSS0 via a resistor.

P01/INTP1

Output: Leave open.

P02/INTP2

P03/INTP3/ADTRG

P10/ANI0 to P17/ANI7

Input

Directly connect to VDD0 or VSS0.

P20/SI30

8-C

I/O

Input: Independently connect to VDD0 or VSS0 via a

P21/SO30

5-H

resistor.

P22/SCK30

8-C

Output: Leave open.

P23/RxD0

P24/TxD0

5-H

P25/ASCK0

8-C

P30, P31

13-P

I/O

Input: Independently connect to VDD0 via a resistor.

P32/SDA0Note 1

13-R

Output: Leave open.

P33/SCL0Note 1

P34/SI31Note 2

8-C

Input: Independently connect to VDD0 or VSS0 via a

P35/SO31Note 2

5-H

resistor.

P36/SCK31Note 2

8-C

Output: Leave open.

P40/AD0 to P47/AD7

5-H

I/O

Input: Independently connect to VDD0 via a resistor.

Output: Leave open.

P50/A8 to P57/A15

5-H

I/O

Input: Independently connect to VDD0 or VSS0 via a

P64/RD

I/O

resistor.

P65/WR

Output: Leave open.

P66/WAIT

P67/ASTB

P70/TI00/TO0

8-C

P71/TI01

P72/TI50/TO50

P73/TI51/TO51

P74/PCL

5-H

P75/BUZ

Notes 1.

SDA0 and SCL0 are incorporated only in the

µPD78F0034AY Subseries.

SI31, SO31, and SCK31 are incorporated only in the

µPD78F0034A Subseries.

UPD78044F Datasheet(PDF) 14 Page - NEC

UPD78044F Datasheet(HTML) 14 Page - NEC

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