June 16, 2002
June 16, 2002
June 19, 2002
7.1059.1 - 7.1059.13
Teaching Address/Data Demultiplexing for Microcontrollers using Lattice Semiconductor ispDesignEXPERT Starter Kit
Eric Clark, Kevin Torres, David Loker
Penn State Erie, The Behrend College
Laboratory experimentation can be a very important part of the learning experience for students. Particularly for microcontroller courses that involve hardware. In Electrical Engineering Technology, lab time is utilized in every course. Experiments involving microcontrollers can account for a lot of time in wiring basic components. Decoding a 16-bit address alone would involve hand wiring 6 logic gates. This would easily take up one lab period itself, assuming the decoding design is correct. Using the Lattice Semiconductor ispDesignEXPERT software, the address decoding can be accomplished using schematic capture and programmed to a programmable logic device (PLD). A student can easily simulate their design in software before going to the hardware. The ispDesignEXPERT allows the user to view the input and output waveforms of the schematic design. Alterations can be made to the schematic and the waveform editor will adjust accordingly. This tool will also be used to teach address/data demultiplexing commonly used in Intel 8051 based microcontrollers for I/O memory-mapping. The ispDesignEXPERT allows more efficient microcontroller experiments to get conducted in a semester providing a better understanding of their function to the students.
This paper describes the tools for programmable logic devices (PLD) and Lattice DesignEXPERT software as applied to microcontroller education. A simple example is given to become familiar with the software and how to program the PLD. Then an address decoding design circuit will be implemented to interface with a microcontroller.
At Penn State Erie, Intermediate Microcontrollers EETBD 455 is taught. This course uses the C508 Infineon microcontroller which is Intel 8051 based. For software and simulation the C51 tools from Keil Software are used. Simulation or hardware labs accompany lectures every week. In lab, software is written in assembly language and then downloaded to a microcontroller. In the more advanced labs, logic gates are used for address decoding. These were hand wired using wire wrap techniques.
Proceedings of the 2002 American Society for Engineering Education Annual Conference & Exposition Copyright Ó 2002, American Society for Engineering Education
Torres, K. (2002, June), Teaching Address/Data Demultiplexing For Microcontrollers Using Lattice Semiconductor Ispdesignexpert Starter Kit Paper presented at 2002 Annual Conference, Montreal, Canada. 10.18260/1-2--10085
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