4.7.3.5 Fo CompOrgArch (Assembly Language)

Question 1

What does the LDR instruction do?

Answer 1

Load the value stored in the memory location specified by <memory> into register d.</memory>

Question 2

What is the purpose of the STR instruction?

Answer 2

Store the value that is in register d into the memory location specified by <memory>.</memory>

Question 3

What operation does the ADD instruction perform?

Answer 3

Add the value specified in <operand2> to the value in register n and store the result in register d.</operand2>

Question 4

What does the SUB instruction do?

Answer 4

Subtract the value specified by <operand2> from the value in register n and store the result in register d.</operand2>

Question 5

What is the function of the MOV instruction?

Answer 5

Copy the value specified by <operand2> into register d.</operand2>

Question 6

What does the CMP instruction compare?

Answer 6

The value stored in register n with the value specified by <operand2>.</operand2>

Question 7

What does the B instruction do?

Answer 7

Always branch to the instruction at position <label> in the program.</label>

Question 8

What are the possible conditions for the B <condition> <label> instruction?</label></condition>

Answer 8

• EQ: equal to
• NE: not equal to
• GT: greater than
• LT: less than

Question 9

What does the AND instruction perform?

Answer 9

A bitwise logical AND operation between the value in register n and the value specified by <operand2>.</operand2>

Question 10

What is the effect of the ORR instruction?

Answer 10

Perform a bitwise logical OR operation between the value in register n and the value specified by <operand2>.</operand2>

Question 11

What does EOR stand for and what does it do?

Answer 11

Exclusive OR (XOR) operation between the value in register n and the value specified by <operand2>.</operand2>

Question 12

What is the purpose of the MVN instruction?

Answer 12

Perform a bitwise logical NOT operation on the value specified by <operand2>.</operand2>

Question 13

What does the LSL instruction do?

Answer 13

Logically shift left the value stored in register n by the number of bits specified by <operand2>.</operand2>

Question 14

What is the function of the LSR instruction?

Answer 14

Logically shift right the value stored in register n by the number of bits specified by <operand2>.</operand2>

Question 15

What does the HALT instruction do?

Answer 15

Stops the execution of the program.

Question 16

What does a label in assembly code signify?

Answer 16

An identifier followed by a colon (:) used to refer to a specific instruction position.

Question 17

What does <operand2> represent in assembly instructions?</operand2>

Answer 17

<operand2> can be a decimal value preceded by # or a register value.
</operand2>

Question 18

What does the immediate addressing mode signify?

Answer 18

The operand is included in the instruction.

Question 19

What is direct addressing in assembly language?

Answer 19

The address of the operand in memory is part of the instruction.

Question 20

Fill in the blank: The _______ instruction stores a value that is in a register into a memory location.

Answer 20

STR

Question 21

Fill in the blank: The _______ instruction adds a specified value to the value within a register.

Answer 21

ADD

Question 22

True or False: The BNE instruction branches if the condition not equal is met.

Answer 22

True

Question 23

What operation does the BLT instruction perform?

Answer 23

Branches to the instruction if the condition less than is met.

Question 24

What operation does the BGT instruction perform?

Answer 24

Branches to the instruction if the condition greater than is met.

Question 25

What is the purpose of the CMP instruction?

Answer 25

Compare value in operand1 to value in operand2.

Question 26

What is the function of the ADD command?

Answer 26

Adds a specified value to the value within a register.

Question 27

What does the SUB command do?

Answer 27

Subtracts a specified value from the value within a register.

Question 28

Fill in the blank: The _______ instruction performs a logical AND operation.

Answer 28

AND

Question 29

Fill in the blank: The _______ instruction performs a logical OR operation.

Answer 29

ORR

Question 30

Fill in the blank: The _______ instruction performs a logical XOR operation.

Answer 30

EOR

Question 31

Fill in the blank: The _______ instruction performs a logical NOT operation.

Answer 31

MVN

Question 32

What happens if the number in memory location 100 is greater than the number in location 110?

Answer 32

Subtract the value in 110 from the value in 100 and store the result in memory location 120.

Question 33

What action does the program take if the number in memory location 100 is smaller than the number in location 110?

Answer 33

Add the value in 110 to the value in 100 and store the result in memory location 120.

Question 34

What occurs if the values in memory locations 100 and 110 are equal?

Answer 34

The program does nothing.

Question 35

What assembly instruction is used to load a value from memory into a register?

Answer 35

LDR

Question 36

What assembly instruction is used to store a value from a register into memory?

Answer 36

STR

Question 37

What is the logical operation used to determine if a number is odd or even?

Answer 37

LOGICAL AND

Question 38

Fill in the blank: A number is odd if oddNumber.00000001 equals _______.

Answer 38

1

Question 39

Fill in the blank: A number is even if evenNumber.00000001 equals _______.

Answer 39

0

Question 40

What does the program do if the number in memory location 100 is odd?

Answer 40

Adds one to the value and stores it back in memory location 100.

Question 41

What type of addressing mode is used in the instruction ADD R3, R3, R0?

Answer 41

Direct addressing

Question 42

What instruction is used to compare two values in the assembly program?

Answer 42

CMP

Question 43

What happens in the loop if R1 equals 0?

Answer 43

The program exits.

Question 44

What is the purpose of the instruction LSL in the program?

Answer 44

To perform a logical shift left on R0.

Question 45

What is the purpose of the instruction LSR in the program?

Answer 45

To perform a logical shift right on R1.