GENERAL DESCRIPTION
The COM20051I is a low-cost, highly-integrated microcontroller incorporating a high-performance network controller based on the ARCNET Token Bus Standard (ANSI 878.1). The COM20051I is based around the popular Intel 8051 architecture. The device is implemented using a microcontroller core compatible with the Intel 80C32 ROMless version of the 8051 architecture. The COM20051I is ideal for distributed control networking applications such as those found in industrial/machine controls, building/factory automation, consumer products, instrumentation and automobiles.

FEATURES
◾ High Performance/Low Cost
◾ Microcontroller Based on Popular 8051 Architecture
◾ Intel 8051 Instruction Set Compatible
◾ Drop-In Replacement for 80C32 PLCC
◾ Network Supports up to 255 Nodes
◾ Powerful Network Diagnostics
◾ Maximum 507 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