In: Categories » » Ethernet » The MCF5282 supports a subset of the Motorola 68000
The MCF5282 supports a subset of the Motorola 68000. Typical use: Applications that use Java and require speed. Source: Systronix (www.systronix.com). Hardware. The TINI isn’t the only option for Java programmers. Systronix’s JStik board (Network article 3-8) contains aJ-100 microcontroller from aJile Systems Inc. The aJ-100’s native execution of Java bytecodes results in very fast performance. The chip is based on the JEM processor developed at Rockwell Collins. The JStik adds a high-speed I/O bus that can operate at bursts of 50 Megabytes per second, two RS-232 ports, and SPI and I2C interfaces. The board fits into a 60-contact SIMM socket and has an RJ-45 plug and additional I/O connectors. Software. Systronix provides aJile’s Jem Builder tool and Charade debugger for building, loading, and testing applications. You can use other Java environments and tools with the JStik as well. Netburner MOD5282 Processor Module At a glance: Fast Ethernet and a fast 32-bit CPU with lots of memory and I/O. Ethernet support: 10BASE-T and 100BASE-TX Typical use: Applications that need speed and abundant resources Source: Netburner, Inc. (www.netburner.com) Hardware. Netburner’s MOD5282 Processor Module contains Motorola’s 32-bit ColdFire MCF5282 processor.
The MCF5282 supports a subset of the Motorola 68000 CPU’s instruction set. The chip has 512 kilobytes of Flash memory and 64 kilobytes of RAM. For I/O interfacing, the MCF5282 has three UARTS, a CAN interface, an I2C controller, a queued serial peripheral interface (QSPI) for synchronous serial communications, and an 8-channel, 10-bit analog-to-digital converter. The chip is in a 256-pin mold array process ball-grid array (MAPBGA) package that contains the media-access control circuits for 10BASE-T and 100BASE-TX Ethernet in addition to the CPU. The MOD5282 includes 8 Megabytes of SRAM and connections for a 16-bit data bus and 16-bit address bus. For networking, the board includes a PHY for 10-Mb/s and 100-Mb/s Ethernet and an RJ-45 connector. Applications are compressed and stored in Flash memory. At startup, the application loads into and runs from RAM.
The Module 5282 Development Kit contains a MOD5282 board, a power supply, connectors, and other components for prototyping and testing. Software. Also included in the Module 5282 Development Kit are software support for Ethernet and Internet protocols, an operating system based on the freeware μC/OS, the freeware GNU C/C++ compiler, a debugger, and configuration utilities. All of the software included with the development kit includes complete source code. The software supports TCP/IP, and related protocols, including code that enables NetBurner modules to function as Web servers and to send and receive e-mail. Microchip Technology PICDEM.net Demonstration Board At a glance: An aid to developing networking applications for Microchip Technology’s PICMicro microcontrollers. Ethernet support: 10BASE-T Typical use: Projects that require minimal resources or any PICMicro-based project with an Ethernet interface or support for Internet protocols. Source: Microchip Technology (www.microchip.com). Hardware.
The PICDEM.net Demonstration Board contains a microcontroller, Ethernet controller, related components, and a breadboarding area. The board is intended mainly for developing and testing, rather than as a plug-in module for use in a product. The microcontroller is a PIC16F877, a member of Microchip Technology’s popular PICMicro family The PIC16F877 has Flash memory that can store 8192 14-bit words, 368 bytes of RAM, and 192 bytes of EEPROM. There are 33 I/O bits. Many of the bits have alternate functions, including an eight-channel, 10-bit analog-to-digital converter, an asynchronous serial port, a synchronous serial port, and a parallel interface. The clock speed is 19.6608 Megahertz. The microcontroller is in a 40-pin DIP socket, and can be replaced by other members of the PIC family, including the PIC18C452 and PIC18F452. The board also contains a 32-kilobyte serial EEPROM for storing Web pages the microcontroller will serve. For experimenting, the board provides LEDs, a pushbutton, potentiometers, and an LCD module. The Ethernet controller is a Realtek RTL8019AS. The interface to the controller uses the CPU’s parallel port and five additional I/O bits. For loading programs, there is a connector for use with Microchip’s MPLAB In-Circuit Debugger, which can program the microcontroller’s Flash memory. You can use the serial port and a terminal emulator such as Windows’ Hyperterminal to load network configuration information into the EEPROM. Software. The microcontroller comes programmed with firmware to support networking and serve a sample Web page. The source code is on the accompanying CD. The networking code is from Iosoft, and is described in detail in the book TCP/IP Lean: Web Servers for Embedded Systems by Jeremy Bentham (CMP Books). The source code is available to anyone who buys the book. Commercial use of the code requires paying a licensing fee to Iosoft.
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