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Exam 13: Addressing Modes and Formats

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Question 21

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The advantage of __________ is that no memory reference other than the instruction fetch is required to obtain the operand.

A) direct addressing
B) immediate addressing
C) register addressing
D) stack addressing

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Question 22

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The principal advantage of ___________ addressing is that it is a very simple form of addressing.

A) displacement
B) register
C) stack
D) direct

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Question 23

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A very powerful mode of addressing,__________ combines the capabilities of direct addressing and register indirect addressing,requiring that the instruction have two address fields,at least one of which is explicit.

Three of the most common uses of stack addressing are relative addressing,base-register addressing,and indexing.

For _________,the address field references a main memory address and the referenced register contains a positive displacement from that address.

The _________ was designed to provide a powerful and flexible instruction set within the constraints of a 16-bit minicomputer.

One advantage of linking the addressing mode to the operand rather than the opcode is that any addressing mode can be used with any opcode.

The actual mapping to a physical address is a function of the _________ and is invisible to the programmer.

"All instructions should have the 'natural' number of operands" and "all operands should have the same generality in specification" are two criteria that were used in designing the __________ instruction format.

Typically an instruction set will include both preindexing and postindexing.

For the _________ mode,the operand is included in the instruction.

Not common on contemporary architectures,___________ requires only one memory reference and no special calculation,but provides only a limited address space.

_________ is a principle by which two variables are independent of each other.

__________ is a design principle employed in designing the PDP-10 instruction set.

The disadvantage of immediate addressing is that the size of the number is restricted to the size of the address field.

The simplest form of addressing is __________ addressing.

Register indirect addressing uses the same number of memory references as indirect addressing.

The __________ instruction set is designed to increase the performance of ARM implementations that use a 16-bit or narrower memory data bus and to allow better code density than provided by the ARM instruction set.

With direct addressing,the length of the address field is usually less than the word length,thus limiting the address range.

The method of calculating the EA is the same for both base-register addressing and indexing.