UPD784021 datasheet(15/90 Pages) NEC

15 / 90 page

mPD784020, 784021

6.3

I/O CIRCUITS FOR PINS AND HANDLING OF UNUSED PINS

Table 6-1 describes the types of I/O circuits for pins and the handling of unused pins.

Fig. 6-1 shows the configuration of these various types of I/O circuits.

Table 6-1 Types of I/O Circuits for Pins and Handling of Unused Pins (1/2)

Note

These pins function as output-only pins depending on the internal circuit, though their I/O type is 5-A.

I/O circuit type

I/O

Recommended connection method for unused pins

P00-P07

5-A

I/O

Input state : To be connected to VDD

P10/PWM0

Output state: To be left open

P11/PWM1

P12/ASCK2/SCK2

8-A

P13/RxD2/SI2

5-A

P14/TxD2/SO2

P15-P17

P20/NMI

Input

To be connected to VDD or VSS

P21/INTP0

P22/INTP1

2-A

To be connected to VDD

P23/INTP2/CI

P24/INTP3

P25/INTP4/ASCK/SCK1

8-A

I/O

Input state : To be connected to VDD

Output state: To be left open

P26/INTP5

2-A

Input

To be connected to VDD

P27/SI0

P30/RxD/SI1

5-A

I/O

Input state : To be connected to VDD

P31/TxD/SO1

Output state: To be left open

P32/SCK0

8-A

P33/SO0/SB0

10-A

P34/TO0-P37/TO3

5-A

AD0-AD7

A8-A15

OutputNote

To be left open

P60/A16-P63/A19

P66/WAIT/HLDRQ

I/O

Input state : To be connected to VDD

P67/REFRQ/HLDAK

Output state: To be left open

P70/ANI0-P77/ANI7

Input state : To be connected to VDD or VSS

Output state: To be left open

ANO0, ANO1

Output

To be left open

ASTB

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