CHAPTER 4 I/O PORTS

4.2Port 0

Port 0 is a general-purpose I/O port and may also serve as peripheral inputs. The pins of this port can be used for peripherals or normal port function that can be selected according to the setting of a bit corresponding to the pin on a specific register.

This section mainly explains the general-purpose I/O function of the port.

This section also describes the structure, pins, and associated registers of port 0 and provides a block diagram of pins.

■Structure of Port 0

Port 0 comprises the following four elements:

•General-purpose I/O pins, external interrupt 2, and analog input pins (P00/INT20/AN4 to P07/INT27)

•Port 0 data register (PDR0)

•Port 0 data direction register (DDR0)

•Port 0 pull-up setting register (PUL0)

■Pins of Port 0

Port 0 has eight general-purpose I/O pins. When used as input pins at the same time, these pins can be also used as external interrupt input pins.

Table 4.2-1 lists the pins of port 0.

Table 4.2-1 Pins of Port 0

Port

Pin name

Function

 

Peripherals for which a pin

Input and output form

Circuit

 

 

 

name

 

 

may serve

Input

Output

type

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P00 general-

 

 

: external interrupt input 20

 

 

 

 

 

 

 

 

 

INT20

 

 

 

 

P00/INT20/AN4

 

 

 

 

purpose I/O

 

AN4

: analog input 4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P01 general-

 

 

: external interrupt input 21

 

 

 

 

 

 

 

 

 

INT21

 

 

 

 

P01/INT21/AN5

 

 

 

 

purpose I/O

 

AN5

: analog input 5

Analog CMOS

 

 

 

 

 

 

 

 

 

 

G

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

hysteresis

 

 

 

 

 

 

 

P02 general-

 

INT22

: external interrupt input 22

 

 

 

P02/INT22/AN6

 

 

 

 

 

purpose I/O

 

AN6

: analog input 6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P03 general-

 

 

: external interrupt input 23

 

 

 

 

 

 

 

 

 

INT23

 

 

 

 

P03/INT23/AN7

 

 

 

 

purpose I/O

 

AN7

: analog input 7

 

 

 

Port 0

 

 

 

 

 

 

 

CMOS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P04 general-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P04/INT24

INT24 : external interrupt input 24

 

 

 

 

purpose I/O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P05 general-

 

 

 

 

 

 

 

P05/INT25

INT25 : external interrupt input 25

 

 

 

 

purpose I/O

 

CMOS

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P06 general-

 

 

 

hysteresis

 

 

 

 

 

 

 

 

 

 

 

 

 

P06/INT26

 

INT26 : external interrupt input 26

 

 

 

 

purpose I/O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P07 general-

 

 

 

 

 

 

 

P07/INT27

INT27 : external interrupt input 27

 

 

 

 

purpose I/O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For circuit type, see Section "1.7 Pin Functions Description " and "1.8 I/O Circuit Types ".

For pin operation when used as analog input, see "CHAPTER 12 A/D CONVERTER ".

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Image 94
Fujitsu MB89202, F202RA manual Pins of Port
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F202RA, MB89202 specifications

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