Assembly Language

Question 1

What does the Assembler do?

Answer 1

Translates the Assembly Language Program into Machine Code for Execution

Question 2

What are Logical Bitwise Operators?

Answer 2

Instructions for logical operation, using in mnemonics, e.g.: HALT to stop the execution of the program

Question 3

Mnemonic - ‘Loading the Value Stored in the Memory Location to register d.

Answer 3

LDR Rd, <memory></memory>

Question 4

Mnemonic - ‘Storing the Value in Register d to a Memory.’ Location

Answer 4

STR Rd, memory ref

Question 5

Mnemonic - ‘Adding the value specified in<operand> to the value in register n to store the result in register d.'</operand>

Answer 5

ADD Rd, Rn, <operand></operand>

Question 6

Mnemonic - ‘Subtracting the value specified in<operand> to the value in register n to store the result in register d.'</operand>

Answer 6

SUB Rd, Rn, <operand></operand>

Question 7

Mnemonic - ‘Copy the value specified by <operand> into register d.'</operand>

Answer 7

MOV Rd, <operand></operand>

Question 8

Mnemonic - ‘Compare the value stored in register n with the value specified by <operand>.'</operand>

Answer 8

CMP Rn, <operand></operand>

Question 9

Mnemonic - ‘Branching always to the instruction at position <label> in the program.’</label>

Answer 9

B <label></label>

Question 10

Mnemonic - ‘Branching conditionally to the instruction at position <label> in the program if the last comparison met the criteria specified by the <condition></condition></label>

Answer 10

B<condition> <label></label></condition>

Question 11

Possible values for <condition> when Branching out can be:</condition>

Answer 11

EQ = Equal to
NE = Not Equal to
GT = Greater than
LT = Less than

Question 12

Mnemonic - ‘Stops the execution of the program.’

Answer 12

HALT

Question 13

What ways can operand be interpreted?

Answer 13

= Use the decimal value specified after the #, e.g.: #27 means the number 27
Rn - Use the value stored in register n. e.g.: R6 means use the value stored in register 6.

Question 14

Mnemonic - ‘Performs a bitwise logical AND operation between the value in register n and the value specified by <operand> and store the result in register d.'</operand>

Answer 14

AND Rd, Rn, <operand></operand>

Question 15

Mnemonic - ‘Performs a bitwise logical OR operation between the value in reg n and the value specified by <operand> and store the result in reg d.'</operand>

Answer 15

ORR Rd, Rn, <operand></operand>

Question 16

Mnemonic - ‘Perform a bitwise logical XOR operation between the value in reg n and the value specified by <operand> and store the result in reg d.'</operand>

Answer 16

EOR Rd, Rn, <operand></operand>

Question 17

Mnemonic - ‘Perform a bitwise logical NOT operation on the value specified by <operand> and store the result in reg d.'</operand>

Answer 17

MVN Rd, <operand></operand>

Question 18

Mnemonic - ‘Logically shift left the value stored in the reg n by the num of bits specified by <operand> and store the result in register d>.'</operand>

Answer 18

LSL Rd, Rn, <operand></operand>

Question 19

Mnemonic - ‘Logically shift right the value stored in the reg n by the num of bits specified by <operand> and store the result in register d>.'</operand>

Answer 19

LSR Rd, Rn, <operand></operand>

Question 20

How to perform Two-Compliment using a NOT function with bitewise operators?

Answer 20

MVN R1 #01100111B
ADD R1, R1, #1

Question 21

What does the B at the end of numbers mean?

Answer 21

The operation B indicates that a binary value rather than a decimal value when performing calculations.