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Exercise_4_Questions-F09

Exercise_4_Questions-F09 - CE-320 Microcomputers I Fall B...

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CE-320 Microcomputers I Fall B 2009 Exercise 4 Page 1 Do NOT use a calculator on this assignment. You will not be allowed to use one on the test or quizzes. Exercise 4 Questions 1. Do Exercises E2.6, E2.7, E2.9, E2.10, E2.13, E2.15, E.23 from the textbook. Define all addresses used in the programs as labels. 2. Trace the following code fragments showing all registers used and the N, Z, V, and C bits. Instead of showing the PC, simply give the code line of the next instruction to execute. a. 1: LDD #$7F80 2: ADDB #$80 3: ADCA #$00 b. 1: LDD #$5678 2: ADDB #$88 3: ADCA #$A9 c. 1: LDD #$0002 2: ADDB #$FF 3: ADCA #$FF d. 1: LDD #$00B0 2: ADDB #$50 3: ADCA #$00 e. 1: LDD #$FF80 2: ADDB #$80 3: ADCB #$00 f. 1: LDD #$7F7F 2: ADDB #$81 3: ADDA #$00 3. For each of the code fragments below, determine which of the 8 simple branches (BPL, BMI, BNE, BEQ, BVC, BVS, BCC, BCS) are taken, not taken, or cannot be determined. Note the Bxx is used to represent a generic branch instruction. a. LDAA #$80 LSLA Bxx 10 b. LDAA #$07 LSRA Bxx 10 c. LDAA #$B3 ROLA Bxx 10 d. LDAA #90 ASRA Bxx 10 e. LDAB #$F0 LSLB LSRB Bxx 10 f. LDD #$8000 LSLD ADCA #0 Bxx 10
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