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Introduction to Digital Electronic Systems
Logic Gate Emulation with the Motorola MCF5206 Processor
Outline
Simple logic functions such as AND, OR, NAND, NOR are normally realized using digital electronic devices. However the same functions can be achieved using software.
The Task
? Develop the assembly code that will run on the estudio Coldfire 5206 simulator to emulate the 2 input AND, OR, NAND, NOR, logic functions.
? The parallel port should be programmed to have pins 4 to 7 set as outputs and pins 0 to 3 set as inputs.
? Pins 0 and 1 should be used to control the logic function to be simulated, an input on these pins of binary 0 should set the logic function to AND, binary 1 sets the logic function to OR, binary 2 sets the logic function to NAND and binary 3 sets the logic function to NOR. Pins 2 and 3 should be used for the logic state inputs.
? Pin 7 should output the logic state to an LED.
? Produce a short written description (One side of A4 paper maximum, printed in 11 point verdana with single line spacing).
? The written description should include the table shown in figure 1 below with the question marks (?) replaced by the appropriate logic levels (0 or 1).
figure 1
Summary
Your submission must include a short description (maximum one A4 side). A pseudo code listing and an assembly (source code) listing. All work must be typed. The completed truth table must be included with the description on a separate sheet of A4 paper.
Test the program by running a simulation with estudio (crossware simulator).
Your source code (.asm file from the estudio project) should also be copied and pasted into a text file and the text file should be submitted on a cd as electronic copy.
Marks will be awarded for;
1) Functionality of the program (the .asm file)
2) Annotation of the program with succinct meaningful comments
3) The pseudo code listing
4) The written description (including the completed truth table)
Up to 25% of the total awarded for each of the 4 items listed above.
Declaration
You must add the following declaration to the work you submit (paper and email submission):
?I confirm that all of the contents of this assignment are my own work. Signed ………..?
You must also sign the (paper) declaration.
Submission Date
The assignment must be submitted no later than 3.00pm on the Friday(week 10).
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