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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 2 Examinations 2007/
Module Title: Microprocessor Architecture
Module Code: COMH 6004
School: School of Mathematics and Computing
Programme Title: Bachelor of Science (Honours) in Software Development - Stage 1 HigherCertificate in Science in Computing in Information Technology Support – Stage 1
Programme Code: KSDEV_8_Y KITSU_6_Y
External Examiner(s): Dr. Mel O Cinneide and Mr. Martin Donnelly Internal Examiner(s): Mr. Seamus Lankford
Instructions: Answer Question 1 and TWO other questions.
Duration: 2 Hours
Sitting: Summer 2008
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
Q1.
a) Describe, with the aid of a diagram, the architecture of a 68000-based microcomputer system (Von Neumann architecture). Show the internal registers and components of a CPU, the system bus and the organisation of memory and Input/Output peripheral devices. [8 marks] b) What is stored in D5 after this program executes? D5 initially contains C89. AND.B #$2C,D ORI.B #$C5,D EOR.L #$CDE,D NOT.W D [8 marks] c) What is wrong with each of the following 68000 assembly language operations? i. CMP.L D0,# ii. MOVE.B #500,D iii. MOVE $4000,A iv. ADD.W (A2)-,D3 [8 marks]
d) Write a 68000 assembly language program that implements the following algorithm:
D3 = 0; D4 = 5; While (D3 < D4) { D3 = D3 + 1; } [8 marks]
e) Briefly describe the function of the following in the 68000 microprocessor: i) PC ii) IR iii) SR iv) DO [8 marks]
[10 marks]
(b) Briefly explain what effect the following code samples have on the stack and the destination operands:
i) LEA $2000,A ii) MOVE.L (A7)+,D iii) RTS [10 marks]
(c) Briefly explain the following methods of passing parameters to a subroutine. Outline the advantages and disadvantages of each method and use simple code examples where appropriate.
i) Passing parameters via registers ii) Passing parameters by value [10 marks]
[30 marks] Q (a) Describe what is meant by the system bus. What are its components? [6 marks]
(b) Describe, briefly, the function of the following in the 68000 microprocessor: i. A ii. Control Unit iii. ALU [9 marks]
(c) Write a 68000 assembly language program, which calculates the average of 10 numbers stored in the array, MYNUMS. The result, i.e. the average of the numbers, should be stored in register D0. Define your array to hold 10 numbers. Use some form of indirect addressing to access the elements within the array. [15 marks] [30 marks]
