3.4 Assembly Language

Question 1

Assembly language

Answer 1

• Uses mnemonics to represent the operation codes and addresses
• Typically 2, 3, 4 character mnemonics are used to represent all the machine code instructions

Question 2

Assembler

Answer 2

Translates the assembly language program into the machine code for execution

Question 3

How can the flow of the program be changed?

Answer 3

Different conditionals

Question 4

Give some examples of conditional

Answer 4

• BRP
• BRA
• BRZ

Question 5

Why can’t the same assembly language be used for different CPU’s?

Answer 5

CPU’s have slightly different forms of assembly language

Question 6

What determines the addressing mode

Answer 6

The 2 bits in the opcode

Question 7

4 different types of addressing modes

Answer 7

• Immediate
• Direct
• Indirect
• Indexed

Question 8

Immediate addressing

Answer 8

Operand is the actual value to be operated on

Question 9

Direct adressing

Answer 9

The operand holds the memory address of the value to be operated on

Question 10

Indirect addressing

Answer 10

Operand is usually the location (typically a register) which holds the address of the data that needs to be used

Question 11

Indexed addressing

Answer 11

The address of the operand is obtained by adding to the contents of a general register a constant value