NEC PD78F9488 Manuale Utente

CHAPTER 2 PIN FUNCTIONS

User’s Manual U15331EJ4V1UD

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

The I/O circuit type of each pin and recommended connection of unused pins are shown in Table 2-1.
For the I/O circuit configuration of each type, see Figure 2-1.

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

Pin Name

I/O Circuit Type

I/O

Recommended Connection of Unused Pins

P00/KR0 to P07/KR7

Note 1

P00/KR00 to P07/KR07

Note 2

8-A

P10, P11

5-A

P20/SCK20/ASCK20 8-A

P21/SO20/TxD20 5-A

P22/SI20/RxD20

P23/SCK10

8-A

P24/SO10 5-A

P25/SI10

Input:

Independently connect to V

or V

via a resistor.

Output: Leave

open.

P30/INTP0/TO50/
TMI60

P31/INTP1/TO60

P32/INTP2/TO61/
TMI61

P33/INTP3/CPT20/
TO20

P34

Note 1

P34/RIN

Note 2

8-A

Input:

Independently connect to V

via a resistor.

Output: Leave

open.

P50 to P53
(mask ROM version)

13-W

P50 to P53
(flash memory version)

13-V

I/O

Input:

Independently connect to V

via a resistor.

Output: Leave

open.

P60/ANI0 to P67/ANI7

Note 1

P60/ANI0/KR10 to
P67/ANI7/KR17

Note 2

9-C

P70 to P73

Note 3

2-H

Input

Connect to V

or V

P80 to P87

Note 3

5-K

I/O

Input:

Independently connect to V

or V

via a resistor.

Output: Leave

open.

COM0 to COM3

S0 to S15

S16 to S19

Note 4

S20 to S27

Note 4

Output

CAPH, CAPL

LC0

to V

LC2

Leave open.

Connect directly to V

– –

Connect directly to V

Notes 1. When

PD789488, 78F9488 is used.

2. When

PD789489, 78F9489 is used.

3. Only when port pin is selected by mask option or port function register.

4. Only when segment output pin is selected by mask option or port function register.