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PDF COM20051+ Data sheet ( Hoja de datos )
| Número de pieza | COM20051+ | |
| Descripción | Integrated Microcontroller and Network Interface | |
| Fabricantes | SMSC Corporation | |
| Logotipo |  |
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COM20051+
www.DataSheet4U.com
Integrated Microcontroller and Network
Interface with Watchdog Timer and A/D
Converter Interface
FEATURES
• Low Cost
• Microcontroller Based on Popular 8051
• 5 Mbps to 156 Kbps Network Data Rate
Architecture
• Network Interface Supports RS-485,
• Intel 8051 Code Compatible
Twisted Pair, Coaxial, and Fiber Optic
• 68 Pin PLCC
Interfaces
• Network Supports up to 255 Nodes
• Receive All Mode Allows Any Packet to Be
• Powerful Network Diagnostics
Received
• Maximum 512 Byte Packets
• On-Board Programmable Watchdog Timer
• Duplicate Node ID Detection
• Analog Data Acquisition Port
• Self-Configuring Network Protocol
• Retains all 8051 Peripherals Including
- Interfaces to Any A/D Converter up to
16 Bits Wide
Serial I/O and Two Timers
- Sampling Rates from 1 s to 100ms
• Utilizes ARCNET® Token Bus Network
Engine
Possible
- Decouples 80C32 from Repetitive
• Requires No Special Emulators
Sampling Tasks
GENERAL DESCRIPTION
The COM20051+ is a low-cost, highly-integrated
microcontroller incorporating a high-
performance 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 fully-
functional 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.
1 page  
PIN NO.
1
4-11
12
19
21
22-28
30
29
3,17,31
37
38-45
46
47
48
57
58-65
DESCRIPTION OF PIN FUNCTIONS
NAME
SYMBOL
DESCRIPTION
Receive In
RXIN
Input. Network receiver input.
P1.0-1.7
P1.0-1.7
Input/Output. Port 1 of the 80C32. General
purpose digital I/O port.
Reset
RESET
Input. Active high reset.
P3.0
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.
P3.1-3.7
P3.1-3.7
Input/Output. Port 3 bits 1-7 of the 8051.
Crystal
Oscillator
XTAL1
Input. Oscillator input 1.
Crystal
Oscillator
XTAL2
Input. Oscillator input 2.
Ground
VSS
Ground pin.
nPulse 2
nPULSE2
Output. Network output. Outputs a synchronous
clock at 2x the data rate when backplane mode is
invoked.
P2.0-2.7
P2.0-2.7
Input/Output. Port 2 of the 8051. High order
address bus.
nProgram Store nPSEN
Enable
Output.
Address Latch ALE
Enable
Output.
Transmit
Enable
TXEN
Output. Active high signal that goes active
whenever data is being transmitted. This signal will
remain low whenever the TXEN bit of the network
controller is reset.
nExternal
nEA/EMUL
Address
Enable/Emulate
Enable
Input. When high, causes the 8051's outputs to tri-
state. When low, allows the 8051 to address
external memory. Must be low to execute code
from the embedded 8051.
P0.7-0.0
P0.7-0.0
Input/Output. Port 0 of the 8051. Multiplexed low
order address/data bus.
5
5 Page 
ARCNET Network Core - Overview and
Architecture
ARCNET is a baseband token passing network
protocol (ANSI 878.1). ARCNET features
deterministic behavior, hardware-based network
configuration, flexible topologies, several data
rates, and multiple media support. Data rates
varying from 5 Mbps to 156 Kbps and message
sizes from 1 to 508 bytes are supported.
Supported media includes RS-485, twisted pair,
coax and fiber optic in bus, star or tree
topologies. ARCNET has enjoyed widespread
use in the industrial community, finding a home
in such applications as I/O control/acquisition,
multi-processor communications, point-of-sale
terminals, in-vehicle navigation systems, data
acquisition systems, remote sensing, avionics,
machine control, embedded computing, building
automation, robotics, consumer products, and
security systems.
The ARCNET core used in the COM20051+ is
similar in architecture to SMSC's 200XX series
of Industrial ARCNET Controllers. The
ARCNET core of the COM20051+ contains a 1K
x 8 internal RAM for packet buffering, Duplicate
ID Detection, Receive All Mode, New Next ID
Indicator, Excessive NACK Interrupt,
Programmable Data Rates, Backplane Mode,
Programmable Transmitter Enable, Polarity
Receive Activity, Reconfiguration, Token Seen
Indicators, and Network Mapping Hooks. The
ARCNET core of the COM20051+ uses a
software-programmable node ID, thus requiring
the user to provide a switch or permanent
storage (EEPROM or EPROM) of the node ID.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet COM20051+.PDF ] | |
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