CSC270 Homework 9

--D. Thiebaut 19:06, 8 April 2009 (UTC)

---

UNDER CONSTRUCTION

Problem #1

Give the schematics for a 3-LED sequencer, very similar to what we did before Spring break. We will label one LED the green LED, another one the yellow LED, and the last one the red LED.

Show the 6811 assembly language program that will activate the LEDs in the following pattern: Green is ON for 1 second, then Yellow turns on for a second, then Red comes on for a second. And the cycle starts over with Green coming on. In other word, create a 3-state sequencer where each LED is ON in one state only.

Compare the difficulty/complexity of modifying the state diagram of the sequencer if you were using flip-flops for the sequencer, and the new 6811-based sequencer. For example, if we decided that Green should stay on for 2 seconds, Yellow for 1 second, and Red for 5 seconds, what are the implications for the flip-flop based sequencer? For the 6811-based sequencer?

Problem #2

...In the works...