IA82050

Data Sheet

Asynchronous Serial Controller

February 25, 2011

IA211030617-08

http://www.Innovasic.com

UNCONTROLLED WHEN PRINTED OR COPIED

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3.

Functional Overview

3.1

Transmitter

The Transmit function consists of a one-character FIFO, and a Transmit Engine. The transmit

engine is responsible for reading the data out of the FIFO and placing it in the proper order on

the TXD pin. The transmit engine is highly configurable to be compatible with numerous

formats, including 16450 and 8250 modes of communication. Transmit Communication

parameters that can be programmed include:

•

Parity modes

•

Stop Bits

•

Character Length

For more details, see Chapter 5, Register Descriptions.

3.2

Receiver

The Receiver function consists of a one-character FIFO and a receive engine. The receive

engine is responsible for sampling the data on the RXD input pin, formatting the data, and

placing the data in the FIFO. The receive engine is highly configurable with parameters that

include:

•

Parity modes

•

Stop Bits

•

Character Length

For more details, see Chapter 5, Register Descriptions.

3.3

Bus Interface

The Bus Interface is a simple interface that allows a micro-processor or micro-controller to read

and write the IA82050 Registers. It consists of the following I/O lines:

•

A0, A1, A2 : 3-Bit Address

•

D0-D7 :

8-Bit Data

•

RDn:

Active Low Read Enable

•

WRn:

Active Low Write Enable

•

CSn:

Active Low Chip Select

•

INT:

Interrupt Output

•

RESET:

Chip Reset