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6608-- Discussion Sheet

6608-- Discussion Sheet - EXAMINATION DISCUSSION LESSON...

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EXAMINATION DISCUSSION LESSON 6608 (25 Questions) 68CH11 PROGRAMMING, PART A To assist you in your review of this lesson we have prepared this discussion sheet. We suggest that you read the discussion on questions you had right as well as on questions you missed. 1. (2) 8 … Study Guide and Fig. 3.2 on page 55 of the textbook. 2. (4) status … Study Guide. 3. (1) b 0 of the CCR… Fig. 3.2 of the textbook. 4. (2) the 2’s complement system … Study Guide and discussion of the N bit in Section 3.1 of the textbook. 5. (4) BCD numbers … Discussion of H bit in Section 3.1 of the textbook; also see Chapter Question #1 on page 88 of the textbook, as well as its answer in the Study Guide. 6. (4) The DAA instruction is used to convert numbers from binary into decimal … Section 3.3, Subsection BCD Addition. The DAA only provides proper adjustment of numbers when two valid BCD numbers are added. If they are binary numbers, the DAA instruction will not change them to decimal properly. 7. (2) is set if an operation may have produced an invalid result … Study Guide and Section 3.1, discussion of the V bit on page 56 of the textbook. 8. (3) logic 1 … The Study Guide has been using “set (logic 1)” and “clear (logic 0)” since the first assignment. 9. (1) set … The SUBB instruction is in the IMM (immediate) mode, so that it will subtract the operand $07 from the contents of the B accumulator, which are also $07. This will leave a $00 in the B accumulator. The Z bit is set whenever an operation results in a zero, as described in Section 3.1, discussion of the Z bit
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