Chapter 4 Assembly Language

What is an instruction set?

• A. A list of data stored in registers

• B. A collection of operations a CPU can perform

• C. A file containing program output

• D. A list of user commands

Machine language in Easy68K consists of:

• Binary and hexadecimal codes

• Assembly mnemonics

• C language statements

• English keywords

Assembly language in Easy68K uses:

• Binary numbers only

• Mnemonics that represent machine instructions

• High-level syntax like Python

• Operating system commands

The software that converts assembly code to machine code in Easy68K is called:

• Compiler

• Assembler

• Emulator

• Loader

In Easy68K, each assembly instruction represents:

• Several machine codes

• One machine instruction

• Multiple functions

• A full program

Which of the following is a valid Easy68K instruction?

• ADD.W D1,D2

• sum = num1 + num2

• print("Hello")

• MOV R1, R2

In Easy68K, the instruction MOVE.B D1, D2 means:

• Copy the byte from D1 to D2

• Add D1 to D2

• Subtract D1 from D2

• Move a word to memory

Which of the following is NOT an addressing mode in Easy68K?

• Immediate

• Direct

• Indexed

• Floating

Example of Immediate Addressing Mode in Easy68K:

• MOVE.B #10, D1

• MOVE.B D1, D2

Example of Direct Addressing Mode:

• MOVE.W DATA, D1

• MOVE.W #20, D1

• MOVE.W (A0), D1

• MOVE.W (A0)+, D1