UPD78P014 datasheet(16/62 Pages) NEC

16 / 62 page

µPD78P014

2.3

Pin Input/Output Circuits and Connection of Unused Pins

The input/output circuit type of each pin and the recommended connection of unused pins are shown in Table

2-1.

The configuration of each type of input/output circuit is shown in Figure 2-1.

Table 2-1. Type of Pin Input/Output Circuits

Input/Output

Circuit Type

I/O

Pin Name

Recommended Connection for Used Pins

Connect to VSS .

Input

: Connect to VSS .

Output

: Leave open.

Connected to VSS .

Input

Input/output

Input

Input/output

Input

—

Input

: Connect to VDD or VSS .

Output

: Leave open.

8-A

5-A

8-A

5-A

8-A

10-A

5-A

8-A

5-A

5-E

5-A

—

P00/INTP0/TI0

P01/INTP1

P02/INTP2

P03/INTP3

P04/XT1

P10/ANI0 to P17/ANI7

P20/SI1

P21/SO1

P22/SCK1

P23/STB

P24/BUSY

P25/SI0/SB0

P26/SO0/SB1

P27/SCK0

P30/TO0

P31/TO1

P32/TO2

P33/TI1

P34/TI2

P35/PCL

P36/BUZ

P37

P40/AD0 to P47/AD7

P50/A8 to P57/A15

P60 to P63

P64/RD

P65/WR

P66/WAIT

P67/ASTB

RESET

XT2

AVREF

AVDD

AVSS

VPP

Input

: Connect to VDD or VSS .

Output

: Leave open.

Input

: Connect to VDD or VSS .

Output

: Leave open.

Input

: Connect to VDD or VSS .

Output

: Leave open.

Input

: Connect to VDD or VSS .

Output

: Leave open.

—

Leave open.

Connect to VSS .

Connect to VDD.

Connect to VSS .

Directly connect to VSS.

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