NEC PD750004 Manuale Utente

CHAPTER 2 PIN FUNCTIONS

2.1 PIN FUNCTIONS OF THE µPD750008

Table 2-1. Digital I/O Port Pins (1/2)

Input/

Also

8 bit

Upon

I/O

used

Function

circuit

output

I/O

reset

type

Note 1

P00

Input

INT4

4-bit input port (PORT0).

Input

P01

I/O

SCK

For P01 to P03, built-in pull-up resistors

F -A

P02

I/O

SO/SB0

can be connected by software in units of

F -B

P03

I/O

SI/SB1

3 bits.

M -C

P10

Input

INT0

4-bit input port (PORT1).

Input

B -C

P11

INT1

Built-in pull-up resistors can be connected

P12

INT2

by software in units of 4 bits. Only the

P13

TI0

P10/INT0 pin is provided with noise
elimination function.

P20

I/O

PTO0

4-bit I/O port (PORT2).

Input

E-B

P21

PTO1

Built-in pull-up resistors can be connected

P22

PCL

by software in units of 4 bits.

P23

BUZ

P30

Note 2

I/O

(MD0)

Note 3

Programmable 4-bit I/O port (PORT3).

Input

E-B

P31

Note 2

(MD1)

Note 3

I/O can be specified bit by bit.

P32

Note 2

(MD2)

Note 3

Built-in pull-up resistors can be connected

P33

Note 2

(MD3)

Note 3

by software in units of 4 bits.

Notes 1. I/O circuits enclosed in circles have a Schmitt-triggered input.

2. An LED can be driven directly.

3. ( ): µPD75P0016