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UNIVERSITY OF CALIFORNIA
College of Engineering Electrical Engineering and Computer Sciences Department
EECS 145M: Microcomputer Interfacing Laboratory
Spring Midterm #1 (Closed book- calculators OK) Monday, March 1, 1999
PROBLEM 1 (16 points) In this course we have discussed four interfacing components that have one input signal, one control input, and one output signal. Timing diagrams for these four components as they would occur in typical use are shown below:
Input
Control
Output
Interfacing component 1
Input
Control
Output
Input
Control
Output
Input
Control
Output
Interfacing component 2
Interfacing component 3
Interfacing component 4
For each interfacing component listed below in column one, enter its number in column two:
Name Interfacing component number
Transparent latch
Tri-state driver
Edge-triggered flip-flop
Sample-and-hold amplifier
PROBLEM 2 (27 points)
Design a microcomputer-based system for generating two different analog waveforms using two D/A converters.
Assume the following:
- The microcomputer has only one 16-bit digital output port.
- The two D/A converters have 12 bits and you need all 12 bits for good accuracy
- The D/As contain only resistors, bit switches, and an output amplifier
- Do not worry about D/A output glitches (you will address that issue in problems 3 and 4)
- You may use a number of 8-bit edge-triggered flip-flops or transparent latches, as your design requires
Do the following:
2a. (9 points) Draw a block diagram of your system, showing and labeling all essential components, connections, and signals. (Draw each D/A converter as a single box.)
PROBLEM 3 (27 points)
After operating the system you designed in problem 1, you discover that occasional output glitches occur because the D/A bit switches do not charge state simultaneously. Design additional modifications to eliminate these glitches from the two analog outputs of your system. ( Hint: sample-and-hold amplifiers could be useful here)
3a. (9 points) Draw the modifications to your problem 1 design, showing and labeling all essential components, connections, and signals.
3b. (9 points) In proper time sequence, list the program and hardware steps necessary for your system to rapidly convert n 1 and n 2 into two glitch-free analog voltages.
3 c. (9 points) Draw a timing diagram for the signals described in part 3b.
PROBLEM 4 (30 points) Design a microcomputer-based system for generating two glitch-free analog waveforms using only one D/A converter. You may assume that the D/A is much faster than the required output data rate. ( Hint: sample-and-hole amplifiers are useful here also)
4a. (9 points) Draw a block diagram of your system, showing and labeling all essential components, connections, and signals.
