UPD784938 datasheet(62/733 Pages) NEC

Part #	UPD784938

Description	16-Bit Single-Chip Microcontrollers

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CHAPTER 2 PIN FUNCTIONS

62

Preliminary User’s Manual U13987EJ1V0UM00

2.3 Input/Output Circuits and Connection of Unused Pins

Table 2-5 shows the input/output circuit types of the pins that have functions, and the connection method when that function

is not used.

Each input/output circuit type is shown in Figure 2-1.

Table 2-5. Pin Input/Output Circuit Types and Recommended Connection of Unused Pins (1/2)

Pin Name

Input/Output

Recommended Connection

Circuit Type

of Unused Pins

P00 to P07

5-A

Input/output

Input:

Connect to VDD

P10, P11

Output: Leave open

P12/ASCK2/SCK2

8-A

P13/RxD2/SI2

5-A

P14/TxD2/SO2

P15 to P17

P20/NMI

2

Input

Connect to VDD or VSS

P21/INTP0

P22/INTP1

2-A

Connect to VDD

P23/INTP2/CI

P24/INTP3

P25/INTP4/ASCK/SCK1

8-A

Input/output

Input:

Connect to VDD

Output: Leave open

P26/INTP5

2-A

Input

Connect to VDD

P27/SI0

P30/RxD/SI1

5-A

Input/output

Input:

Connect to VDD

P31/TxD/SO1

Output: Leave open

P32/SCK0

10-A

P33/SO0

P34/TO0 to P37/TO3

5-A

P40/AD0 to P47/AD7

P50/A8 to P57/A15

P60/A16 to P63/A19

P64/RD

P65/WR

P66/WAIT/HLDRQ

P67/REFRQ/HLDAK

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