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Name: ________SOLUTION______ Date: 2 October 2003
This
exam is open book, open notes, and you may use a calculator. You may not share books, or
calculators. Be careful to read the
instructions, the questions, and the answers carefully. Only these pages will be accepted, do not
attach any other paper, as it will not be graded. You should show your work as partial credit possible.
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1. |
(6 points) Label the diagram of the three major components of any digital computer system and the three busses connecting them |
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2. |
(5 points) Consider the following State diagram.
How many
States does it have? _______5______ How many
inputs does the circuit have? ___1_____ What is the
minimum number of bits required for the circuit for this state machine? ____3______ How many
outputs does the circuit have? ______1_______ After 1 clock
cycles, this machine could be in state B or state J. After 2 clock cycles In what states could this machine be? ___B, D, J_________ |
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3. |
(6 points)
Consider the following Flow Chart.
How many
times will this program read PORT E? ___172 or $AC_____ One of the
symbols in flowchart is implements with the instruction stab $1004. What shape is
that symbol? ____Rectangle_____ How many
times will the program write to Port B? ___172 or $AC ________ What is the largest possible value that can be on PORT B at the end of the program? $FF or 255 |
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4. |
(18 points) Fill in the missing values for the following table (0.5 points each):
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The following Multiple choice questions will be scored as: 3 points for each question that is answered correctly, -1 point for each question that is answered incorrectly, and 0 points for unanswered questions.
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5. |
For a
completely specified state diagram, how many edges exit each state for a
circuit with 2 inputs? |
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A) |
0 |
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B) |
1 |
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C) |
2 |
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D) |
3 |
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E) |
4 |
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F) |
None of the
Above |
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6. |
For a
completely specified state diagram, how many edges exit each state for a
circuit with 1 output? |
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A) |
0 |
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B) |
1 |
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C) |
2 |
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D) |
3 |
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E) |
Cannot
be determined from the information given. |
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F) |
None of the
above. |
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7. |
What does the
PC stand for in the PC register? |
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A) |
Politically
Correct |
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B) |
Personal
Computer |
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C) |
Program Code |
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D) |
Program
Counter |
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E) |
Progress Count |
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F) |
None of these
choices. |
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8. |
What is
characteristic of the type of I/O used by the 6811? |
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A) |
It is Memory
Mapped. |
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B) |
It is
Un-Buffered. |
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C) |
It is
Parallel. |
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D) |
It is Serial. |
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E) |
All
four of A, B, C, and D. |
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F) |
None of the
above. |
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9. |
How many LED's (Light Emitting Diodes)
does the 68HC11A8 have? |
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A) |
0 |
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B) |
1 |
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C) |
2 |
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D) |
3 |
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E) |
8 |
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F) |
None of the above |
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10. |
How many LCD
(Liquid Crystal Display) digits does the 68HC11A8 have? |
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A) |
0 |
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B) |
1 |
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C) |
2 |
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D) |
3 |
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E) |
3.5 |
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F) |
None of the
above |
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11. |
How many
eight bit registers does the 68HC11A8 have? |
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A) |
0 |
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B) |
1 |
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C) |
2 |
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D) |
3 |
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E) |
4 |
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F) |
None of the
above |
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12. |
The logical
AND of $2F with Register A (containing $3B) is? |
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A) |
$00 |
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B) |
$3F |
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C) |
$2B |
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D) |
$3B |
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E) |
$2F |
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F) |
$FF |
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13. |
How does the
68HC11A8 determine whether a binary value is numerical data, ASCII character
data, a memory address, or a machine code instruction? |
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A) |
Based upon
which register has the value |
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B) |
The memory
location where the value is stored |
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C) |
It
cannot be determined. |
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D) |
From software
instructions. |
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E) |
From the flow
chart or state diagrams. |
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F) |
By the value
itself. |
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14. |
How much RAM
does the single chip 68HC11A8 have? |
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A) |
250 bytes |
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B) |
Less than 250
bytes |
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C) |
More than
1000 bytes |
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D) |
2048 bytes |
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E) |
256
bytes |
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F) |
None of the
above. |
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15. |
How much
EEPROM does the single chip 68HC11A8 have? |
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A) |
Less than 250
bytes |
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B) |
256 bytes |
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C) |
64 bytes |
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D) |
More than
1000 bytes |
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E) |
4096
bits |
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F) |
512 bits |
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16. |
How much ROM
does the single chip 68HC11A8 have? |
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A) |
256 bytes |
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B) |
64 bytes |
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C) |
512 bytes |
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D) |
4098 bytes |
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E) |
8192
bytes |
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F) |
65536 bytes |
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17. |
How many
address bits are in the address bus for the 68HC11A8? |
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A) |
65536 |
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B) |
4 |
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C) |
8 |
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D)
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16
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E) |
32 |
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F) |
Undetermined
or variable based upon amount of memory used. |
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18. |
What is the
address space for the single chip 68HC11A8 |
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A) |
0 to 65536 |
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B) |
0 to 16 |
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C) |
0 to
65535 |
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D) |
0 to 256 |
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E) |
$0000 to
$E000 |
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F) |
$0000 to
$FFFE |
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19. |
Register B
contains $0A. A logical OR is
performed with Register B and the value $11.
What is the result in Register B? |
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A) |
$00 |
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B) |
$FF |
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C) |
$0A |
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D) |
$11 |
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E) |
$1B |
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F) |
None of these
choices |
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The following True/False
questions are worth 2 points each.
Circle T for True and F for False for your answer.
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20. |
T
There is an assembly code
instruction for each machine code instruction. |
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21. |
F A byte of RAM holds 1 more
bit of information than a byte of ROM. |
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22. |
T
A byte is represented with
two hexadecimal digits. |
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23. |
F
Indexed
addressing can use any of the 16 bit registers for the index. |
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24. |
F
Register
D, which has 16 bits, can be used as the index for index addressing. |
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25. |
F
Every
Assembly instruction must have some text in the label field. |
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26. |
T An entire assembly program
could be written without using any label fields. |
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27. |
F Inherent addressing instructions never use the X
register as an operand. |
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28. |
F Inherent
addressing always uses the A register as an operand. |
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29. |
F
A flow
chart describes the memory usage of a program. |