Electronics America 4-Bit Single-Chip Microcomputer User's Manual

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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

Pin used Function circuit

output

I/O reset

type

Note 1

P00 Input INT4 4-bit input port (PORT0). x Input B

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). x 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). x 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). x 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