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EE206.i Autumn 2009 Page 1 of 5
Autumn Examinations 2009
Exam Code(s) 2BP121, 2BN
Exam(s) Second Electronic and Computer Engineering
Second Electronic Engineering
Module Code(s) EE206.i
Module(s) Microprocessor Systems Engineering 1
Paper No. 1
Repeat Paper
External
Examiner(s)
Prof. G. Irwin
Internal
Examiner(s)
Prof. G. Ó Laighin
Dr. M. Glavin
Instructions: Answer Question^^1 and any two other questions.
Question 1 is compulsory and carries 40 marks.
Questions 2, 3 and 4 carry 30 marks each.
Duration 2hrs
No. of Pages 5
Department(s) Electrical & Electronic Engineering
Course Co-
ordinator(s)
Requirements :
MCQ
Handout
Statistical Tables
Graph Paper
Log Graph Paper
Other Material
EE206.i Autumn 2009 Page 2 of 5
1. Compulsory Question [40 marks total]
(a) Describe in your own words the functions of the Address, Data and Control buses of a
typical microprocessor based system. You may use diagrams where necessary. [5 marks]
(b) Draw a block diagram of the architecture of a modern PC motherboard. [5 marks]
(c) Describe the process of converting from binary to floating point data type. You may use an
example to illustrate the process. [5 marks]
(d) With the aid of a system block diagram showing a microprocessor and memory device,
describe the memory read operation. You should further illustrate your answer with a timing
diagram. [5 marks]
(e) How long does the following piece of assembly language take to execute (assuming a
12MHz clock frequency)?:
MOV A,#55h
MUL AB
JMP NEXT
NEXT: MOV P2,A
MOV P3, B [5 marks]
(f) Write an assembly language program to add the number stored at memory location 27H to
the number 33, store the result in Bank 2, Register 4 and output this same value on port 2
(you may need to refer to the Microconverter quick reference guide at the end of this exam
paper). [5 marks]
(g) Describe the following addressing modes: (a) immediate addressing and (b) direct
addressing, and explain the differences between the two modes. Use examples to illustrate
your answer. [5 marks]
(h) Describe the sequence of events that takes place when an interrupt is asserted in an 8051
microcontroller, with particular reference to ISR vectoring. [5 marks]
2. (a) With reference to a modern computer system, explain briefly the following terms (your
answer must include a short description of main features of each technology):
i. DVI
ii. Firewire
iii. RAID [6 marks]
(b) Describe in simple terms how a Liquid Crystal Display (LCD) works (your answer should
make reference to polarisation etc.) [6 marks]
(c) How is cache used to speed up a modern computer system? (Your answer should include a
diagram of how cache is situated with respect to the microprocessor and main memory.)
How does it differ from conventional RAM? What are the differences between level 1 and
level 2 cache? [8 marks]
(d) Explain (with the aid of a diagram) how you would interface a keypad to a microcontroller.
You may assume that the keypad is a switch matrix and that the key decoding must be done
on the microprocessor. Describe the process of decoding for each key on the keypad. How
could such a keypad be set up to use interrupts? [10 marks]
3. (a) What is STACK memory generally used for in a microprocessor system? How does the
STACK operate and how is it addressed? [6 marks]
(b) Describe the basic Von Neumann architecture instruction cycle. You may use a flowchart to
illustrate your answer. [6 marks]
(c) External interrupt IE0 has a vector address of 03h. Explain what you understand by this
statement and how this information influences the behaviour of an 8051 Microcontroller
when external interrupt IE0 is triggered. [6 marks]
(d) Why are internal timers preferable to coded delay loops for timing events in an 8051
program? [6 marks]
(e) With the aid of a diagram, show how a switch might be connected to port pin p0.0 (note: it is
not necessary to show the internal details of the port pin). Explain your answer. [6 marks]
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#A(/!: (^) #A( * (^) 7-
#A(/!: (^) #A( (^) " = * (^) 75E&11&F
#A(/!: (^) #A( * (^) 7 E= ,5J= ,
#A(/!: (^) 0=$8:": &=
/%' F
$- (^) ?EG$- (^) ?( (^) #A( 9
$- (^) EG$- (^) ( (^) #A( 9
$!*
# " "
(^) * 9
#/!: (^) + " B 99" C= *D
#/!:J
+ "
(^) " (^) *
#/!:& (^) E=J=+
(^) B" 0=+ (^) B &=) 9*F
#/!: (^) "+ "
(^) " (^) *
#/!: (^) E=J=+
(^) B" 0=+ (^) B &=) 9*F
#/!: (^) C" + " * !#/! 99*"9D
#/!: (^) + " * E= "= F
0!*
$ 0 "
(^) * 9
$0/!:
$ 0 " C= D
$0/!:
" -
(^) C ,D
$0/!:
,=* 9E
/%' 5C0U DF5* 9
$0/!:
C " "D
06
$ 0 "*- 9
$0=CU
/%' D5C U
(^) DB1& ,
(/ $
(^) +
(' $
(^) + " C= D
(/ )G
(^) +
( $"+
( * C= *- D
% *+ (^)
$ (^) " (^) " "
(^) C=%4=$4D
*" "
(^) +
/!* (^) " (^) * 9
/ (^)
(^) 9
/ (^) 9
/!0: (^) (^) " (^) *9C=" -D
/!0: (^) 9" " C=9" " D
/!0:J (^) " - 9 * " P
/!0:& (^) EJ010F
/!0:
* 7- C= *7= *75D
/!0:
C=- = D
/!0:
+ C= =9"D
/!0:
* " *
!*
" (^) * 9
C )6
"*D "
C" ^
"*D "
" C &
"9D
