Fall2012_Exam3B_sol - CS/ECE 252 INTRODUCTION TO COMPUTER...

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- 1 - CS/ECE 252: INTRODUCTION TO COMPUTER ENGINEERING UNIVERSITY OF WISCONSIN MADISON Prof. Gurindar Sohi TAs: Pradip Vallathol and Junaid Khalid Midterm Examination 3 In Class (50 minutes) Friday, November 9, 2012 Weight: 17.5% NO: BOOK(S), NOTE(S), OR CALCULATORS OF ANY SORT. The exam has nine pages. Circle your final answers . Plan your time carefully since some problems are longer than others. You must turn in the pages 1-7 . LAST NAME: ___________________________________________________________ FIRST NAME: ___________________________________________________________ ID# ___________________________________________________________
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- 2 - Problem Maximum Points Points Earned 1 4 2 3 3 3 4 3 5 8 6 4 7 5 Total 30
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- 3 - Problem 1: The following flowchart is being converted into a sequence of LC-3 instructions as represented in the table below. Fill in the missing instructions and comments. Comments represent a summary of what the instruction does. (4 Points) Address Instructions Comments 0x3000 0101 0000 0010 0000 Clear the contents of R0 0x3001 0101 0010 0110 0000 Clear the contents of R1 0x3002 0101 0100 1010 0000 Clear the contents of R2 0x3003 0001 0010 0110 0101 R1 = R1 + 5 0x3004 0101 0000 1000 0011 R0 = R2 AND R3 0x3005 0001 0110 1100 0100 R3 = R3 + R4 0x3006 0001 0010 0111 1100 R1 = R1 4 0x3007 0000 0011 1111 1100 If P, branch to x3004 0x3008 1111 0000 0010 0101 HALT
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- 4 - Problem 2: Suppose you are not allowed to use the LC-3 LDI instruction. Write a sequence of LC-3 instructions (in hex) that would achieve the same result as the LC-3 LDI instruction 0xA60E. (3 Points) 0x260E ; LD R3, 12 0x66C0 ; LDR R3, R3, 0 Problem 3: List and briefly explain the three ways to partially run a program while debugging it. (3 Points) Single Stepping: Execute one instruction at a time. Breakpoints: Tell the simulator to stop executing at a specific instruction.
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