GENERAL DESCRIPTION

The COM20051+ is a low-cost, highly-integrated microcontroller incorporating a highperformance network controller based on the ARCNET Token Bus Standard (ANSI 878.1). The COM20051+ is based around the popular Intel 8051 architecture. The device is implemented using a microcontroller core similar to the Intel 80C32 ROMless version of the 8051 architecture. The COM20051+ is ideal for distributed control networking applications such as those found in industrial/machine controls, building/factory automation, consumer products, instrumentation, and automobiles.

FEATURES

• Low Cost

• Microcontroller Based on Popular 8051 Architecture

• Intel 8051 Code Compatible

• 68 Pin PLCC

• Network Supports up to 255 Nodes

• Powerful Network Diagnostics

• Maximum 512 Byte Packets

• Duplicate Node ID Detection

• Self-Configuring Network Protocol

• Retains all 8051 Peripherals Including Serial I/O and Two Timers

• Utilizes ARCNET® Token Bus Network Engine

• Requires No Special Emulators

• 5 Mbps to 156 Kbps Network Data Rate

• Network Interface Supports RS-485, Twisted Pair, Coaxial, and Fiber Optic Interfaces

• Receive All Mode Allows Any Packet to Be Received

• On-Board Programmable Watchdog Timer

• Analog Data Acquisition Port

- Interfaces to Any A/D Converter up to 16 Bits Wide

- Sampling Rates from 1 s to 100ms Possible

- Decouples 80C32 from Repetitive Sampling Tasks