COMPUTER SCIENCE ILLUMINATED
COMPUTER SCIENCE ILLUMINATED
7th Edition
ISBN: 9781284208047
Author: Dale
Publisher: JONES+BART
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Chapter 6, Problem 27E

a.

Program Plan Intro

Instruction Specifier:

  • The instruction specifier is used to store the binary value of the instruction.
  • It instructs the machine regarding which operation has to be performed.
  • Every instruction uses instruction specifier.
  • The instruction specifier is 8 bits (1 byte) long.
    • The first four or five bits are used to represent the operation code.
    • The last three bits are used to represent the addressing mode.
      • Immediate addressing mode (000)
      • Direct addressing mode (001)

Diagrammatic representation of instruction specifier:

The instruction specifier is depicted as given below:

COMPUTER SCIENCE ILLUMINATED, Chapter 6, Problem 27E

Explanation of Solution

b.

Direct addressing mode:

  • The last three bits of the instruction specifier is used to refer the addressing mode.
    • Immediate addressing mode (000)
    • Direct addressing mode (001)
  • In direct addressing mode, the operand contains the address of the data that is to be loaded into the accumulator.
  • If the last three bits of the instruction specifier is “001”, then the address of the data will be available in the operand specifier...

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