Cork Institute of Technology
Higher Certificate in Engineering in Electronic Engineering – Award
(National Certificate in Engineering in Electronic Engineering – Award)
(NFQ - Level 6)
Autumn 2005
Microprocessor Systems
(Time: 3 Hours)
Answer Question 1 [40 marks] and any three
other questions [each 20 marks]
Maximum available marks is 100
Examiners: Mr. J.J. O’Sullivan
Mr. J. Berry
Dr. R. Ó Dúbhghaill
Q1 (a) Name the main component parts of a digital computer and mention briefly the
function of each.
(b) What is an assembler? Explain briefly the difference between a resident assembler
and a cross assembler.
(c) If a memory chip has pins labelled D0 - D3 and A0 - A10, determine the capacity
of this chip - show all working.
(d) The value 111010102 is an 8-bit two’s complement binary number.
Is this value positive or negative? - explain.
Express this value in decimal - show all working.
(e) Before the instructions below are carried out, a block of memory is displayed as
400500: 0000 0000 0000 0000 0000 0000 0000 0000
Rewrite this block, when all of the instructions below have been executed.
i)
MOVE.W #$AAAA,$400502
ii)
MOVE.L #$45678A,$40050A
iii)
MOVE.B #$55,$400507
(f) Using one sentence in each case, explain the effect on the Z, N, C and V flags of the
instruction SUB.W D0,D1, if D0.W = $4321 and D1.W = $1234
(g) Draw a simple block diagram showing the registers you would expect to find in a
single-port parallel input/output chip. State the function of each register.
(h) If D0.W = $1234 and D1.W = $8765, explain fully whether or not a branch to
LABEL will occur in the program segment below.
CMP.W D1,D0
BGE LABEL
