COM20051 datasheet(4/82 Pages) SMSC

4 / 82 page

OVERVIEW

The COM20051 is essentially a network board-

in-a-chip. It takes an 80C32 microcontroller core

and an ARCNET controller and integrates them

into a single device.

ARCNET is a token

passing-based protocol that combines powerful

flow control, error detection, and diagnostic

capabilities to deliver fast and reliable messages.

The COM20051 supports a variety of data rates

(5 Mbps to 156 Kbps), topologies (bus, star,

tree), and media types (RS-485, coax, twisted

pair, fiber optic, and powerline) to suit any type of

application.

The ARCNET network core of the COM20051

contains many features that make network

development simple and easy to comprehend.

Diagnostic

features,

such

Receive

All,

Duplicate

Detection,

Reconfiguration

Detection, Token, and Receiver Detection, all

combine to make the COM20051 simple to use

and to implement in any environment.

The

ARCNET protocol itself is relatively simple to

understand and very flexible. A wide variety of

support products are available to assist in

network development, such as software drivers,

line drivers, boards, and development kits. The

COM20051 implements a full-featured 16MHz,

Intel-compatible 80C32 microcontroller with all of

the standard peripheral functions, including a full

duplex serial port, two timer/counters, one 8-bit

general purpose digital I/O port, and interrupt

controller. The 8051 architecture has long been

a standard in the embedded control industry for

low-level data acquisition and control. ARCNET

and the 8051 form a simple solution for many of

today's and tomorrow's low-level networking

solutions.

In addition to the 80C32 and the ARCNET

network core, the COM20051 contains all the

address decoding and interrupt routing logic to

interface the network core to the 80C32 core.

The

integrated

8051/ARCNET

combination

provides an extremely cost-effective and space-

efficient

solution

for

industrial

networking

applications. The COM20051 can be used in a

stand-alone embedded application, executing

control algorithms or performing data acquisition

and communicating data in a master/slave or

peer-to-peer configuration, or used as a slave

processor handling communication tasks in a

multi-processing system.

DESCRIPTION OF PIN FUNCTIONS

PIN NO.

NAME

SYMBOL

DESCRIPTION

Receive In

RXIN

Input. Network receiver input.

2-9

P1.0-1.7

Input/Output. Port 1 of the 8051. General purpose

digital I/O port.

Reset

RESET

Input. Active high reset.

P3.0

Input/Output. Port 3 bit 0 of the 8051. RX input of

serial port.

nPulse 1

nPULSE1

Output. Network output. Open-drain when

backplane mode is invoked, otherwise it is a push-

pull output.

13-19

P3.1-3.7

Input/Output. Port 3 bits 1-7 of the 8051.

20, 21

Crystal Oscillator XTAL1,

XTAL2

Input. Oscillator inputs 1 and 2.

Ground

VSS

Ground pin.

COM20051 Datasheet(PDF) 4 Page - SMSC Corporation

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