CSC270 6811 Programming Exercises

--D. Thiebaut 16:48, 24 March 2011 (EDT)

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All exercises should be assembled by hand.

Exercise 1

Write and assemble a 6811 assembly language program that adds the contents of 2 variables in memory, a, and b, and stores the result in a third variable sum.

Exercise 2

Same as Exercise 1, but use a different method, either selecting a different addressing mode, or different instructions.

Exercise 3

Compute the first 6 Fibonacci terms, assuming that you have an array of 6 bytes, all initially containing 0.

Exercise 4

Same idea: take your solution for Exercise 3 and modify it. The result should be the same, but you have to change the way the computation is done.

Exercise 5

Write an endless loop that stores 1, 2, 3, 4, 5... in a variable in memory called count. How long is your loop, in terms of CPU cycles?

Exercise 6

Make your loop faster!

Exercise 7

Even faster!

Exercise 8

Compute the sum of all the integers between 1 and 22, using no more than 10 instructions.