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Authors:
Linda Null ,julia Lobur
Chapter:
A Closer Look At Instruction Set Architectures
Exercise:
Exercises
Question:13 | ISBN:9780763704445 | Edition: 3

Question

13. Suppose we have the instruction Load 1000. Given that memory and register R1 contain the values below:

Assuming R1 is implied in the indexed addressing mode, determine the actual value loaded into the accumulator and fill in the table below:

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Answer

Immediate Addressing Mode: is so-named because the value to  be referenced immediately follows the operation code in the instruction .

Direct Addressing Mode: Mode: is so-named because the value to  be referenced is obtained by specifying its memory address directly in the instruction .

Indirect Addressing mode : In this mode , the bits in the address field specify a memory address that is to be used as a pointer. The effective address of the operand is found by going to this address.

Indexed Addressing mode: A index register(either Explicitly or implicitly designated ) is used to store an offset, which is added to the operand resulting in the effective address of the data.    

From the given information, the following results have generated:

Mode

Value loaded into AC

Immediate Addressing Mode

1000

Direct Addressing Mode

1400

Indirect Addressing Mode

1300

Indexed Addressing Mode

1000

 

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