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COM20051+ Dataheets PDF



Part Number COM20051+
Manufacturers SMSC Corporation
Logo SMSC Corporation
Description Integrated Microcontroller and Network Interface
Datasheet COM20051+ DatasheetCOM20051+ Datasheet (PDF)

COM20051+ Integrated Microcontroller and Network Interface with Watchdog Timer and A/D Converter Interface FEATURES • • • • • • • • • • • • www.DataSheet4U.com 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 Bu.

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COM20051+ Integrated Microcontroller and Network Interface with Watchdog Timer and A/D Converter Interface FEATURES • • • • • • • • • • • • www.DataSheet4U.com 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 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. The COM20051+ contains many features that are beneficial for embedded control applications. The microcontroller is a fullyfunctional 16MHz 80C32 that is comparable to the Intel 80C32. In contrast to other embedded controller/networking solutions, the COM20051+ adds a fully-featured, robust, powerful, and simple network interface, watchdog timer, and data acquisition port, while retaining all of the basic 8051 peripherals, such as the serial port and counter/timers. TABLE OF CONTENTS FEATURES .......................................................................................................................................1 GENERAL DESCRIPTION.................................................................................................................1 PIN CONFIGURATION ......................................................................................................................3 OVERVIEW .......................................................................................................................................4 DESCRIPTION OF PIN FUNCTIONS ................................................................................................5 BASIC ARCHITECTURE ...................................................................................................................8 PROTOCOL DESCRIPTION............................................................................................................ 14 NETWORK PROTOCOL............................................................................................................ 14 DATA RATES ............................................................................................................................ 14 NETWORK RECONFIGURATION ............................................................................................. 14 BROADCAST MESSAGES ........................................................................................................ 16 EXTENDED TIMEOUT FUNCTION ............................................................................................ 16 LINE PROTOCOL...................................................................................................................... 17 SYSTEM DESCRIPTION .................................................................................................................. 20 MICROCONTROLLER INTERFACE .......................................................................................... 20 TRANSMISSION MEDIA INTERFACE ....................................................................................... 20 ARCNET CORE FUNCTIONAL DESCRIPTION ................................................................................ 28 MICROSEQUENCER................................................................................................................. 28 INTERNAL REGISTERS ............................................................................................................ 28 INTERNAL RAM ........................................................................................................................ 40 COMMAND CHAINING .............................................................................................................. 44 RESET DETAILS ....................................................................................................................... 47 INITIALIZATION SEQUENCE .........................................................................


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