33FJ128GP708 datasheet(33/90 Pages) MICROCHIP

33 / 90 page

Preliminary

DS70155C-page 31

dsPIC33F

8.12

I/O Pins

Some pins for the I/O pin functions are multiplexed with

an alternate function for the peripheral features on the

device. In general, when a peripheral is enabled, that

pin may not be used as a general purpose I/O pin.

All I/O port pins have three registers directly associated

with the operation of the port pin. The Data Direction

output. The Port Data Latch register provides latched

output data for the I/O pins. The Port register provides

visibility of the logic state of the I/O pins. Reading the

Port register provides the I/O pin logic state, while

writes to the Port register write the data to the Port Data

Latch register.

I/O port pins have latch bits (Port Data Latch register).

This register, when read, yields the contents of the I/O

latch and when written, modifies the contents of the I/O

latch, thus modifying the value driven out on a pin if the

corresponding Data Direction register bit is configured

for output. This can be used in read-modify-write

instructions that allow the user to modify the contents

of the Port Data Latch register, regardless of the status

of the corresponding pins.

The I/O pins have the following features:

• Schmitt Trigger input

• CMOS output drivers

• Weak internal pull-up

All I/O pins configured as digital inputs can accept 5V

signals. This provides a degree of compatibility with

external signals of different voltage levels. However, all

digital outputs and analog pins can only generate

voltage levels up to 3.6V.

The input change notification module gives dsPIC33F

devices the ability to generate interrupt requests to the

processor in response to a change of state on selected

input pins. This module is capable of detecting input

changes of state, even in Sleep mode, when the clocks

are disabled. There are up to 24 external signals (CN0

through CN23) that can be selected (enabled) for

generating an interrupt request on a change of state.

Each of the CN pins also has an optional weak pull-up

feature.

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