3.7.3.5 Machine-Code/Assembly Language Operations.

Question 1

Outline the AQA assembly language for LOAD.

Answer 1

LDR Rx,

Question 2

Describe LOAD.

Answer 2

Load the value stored in the
memory location specified by into
register x.

Question 3

Outline the AQA assembly language for STORE.

Answer 3

STR Rx,

Question 4

Describe STORE.

Answer 4

Store the value that is in register x into the memory location specified by .

Question 5

Outline the AQA assembly language for ADD.

Answer 5

ADD Rx, Ry,

Question 6

Describe ADD.

Answer 6

Add the value specified by
to register y and
store the result in register x.

Question 7

Outline the AQA assembly language for SUBTRACT.

Answer 7

SUB Rx, Ry,

Question 8

Describe SUBTRACT.

Answer 8

Subtract the value specified by from the value in register y and store the result in register x.

Question 9

Outline the AQA assembly language for MOVE.

Answer 9

MOV Rx,

Question 10

Describe MOVE.

Answer 10

Copy the value specified by

into register x.

Question 11

Outline the AQA assembly language for COMPARE.

Answer 11

CMP Rx,

Question 12

Describe COMPARE.

Answer 12

Compare the value stored in register x with the value specified by .

Question 13

Outline the AQA assembly language for BRANCH(unconditional).

Answer 13

B

Question 14

Describe BRANCH (unconditional) .

Answer 14

Always branch to the instruction at the position specified by
in the program.

Question 15

Outline the AQA assembly language for BRANCH (conditional).

Answer 15

B

Question 16

Describe BRANCH (conditional).

Answer 16

Branch to the instruction at
position  if the last
comparison met the criterion
specified by .
Possible values for
 are:
● EQ: equal to
● NE: not equal to
● GT: greater than
● LT: less than

Question 17

Outline the AQA assembly language for Logical AND.

Answer 17

AND Rx, Ry,

Question 18

Describe logical AND.

Answer 18

Perform a bitwise logical AND operation between the value in register y and the value specified by and store the
result in register x.

Question 19

Outline the AQA assembly language for logical OR.

Answer 19

OR ORR Rx, Ry,

Question 20

Describe Logical OR.

Answer 20

Perform a bitwise logical OR

operation between the value in register y and the value specified by and store the result in register x

Question 21

Outline the AQA assembly language for logical XOR.

Answer 21

OR EOR Rx, Ry,

Question 22

Describe Logical XOR.

Answer 22

Perform a bitwise logical XOR (exclusive or) operation between the value in register y and the value specified by
and store the result in register x.

Question 23

Outline the AQA assembly language for Logical NOT.

Answer 23

T MVN Rx,

Question 24

Describe Logical NOT.

Answer 24

Perform a bitwise logical NOT operation on the value specified by and store the result in register x.

Question 25

Outline the AQA assembly language for logical shift left.

Answer 25

LSL Rx, Ry,

Question 26

Describe Logical Shift Left.

Answer 26

Logically shift left the value stored in register y by the number of bits specified by and store the result in register x.

Question 27

Outline the AQA assembly language for logical shift right.

Answer 27

LSR Rx, Ry,

Question 28

Describe Logical Shift Right.

Answer 28

Logically shift right the value stored in register y by the number of bits specified by and store the result in register x.

Question 29

Outline the AQA assembly language for halt.

Answer 29

HALT

Question 30

Describe Halt.

Answer 30

Stops the execution of the

program.