Machine code

Patterns of binary digits (0s and 1s)

Mnemonics

Short codes representing processor operations

symbol in operand

Indicates immediate addressing (actual data value)

Direct addressing

Operand contains memory address where data is located

Opcode

Specifies what operation processor should perform

Four operation categories

Data transfer, arithmetic, logical, branch

MOV instruction function

Copies value from one location to another

LDR instruction function

Loads data from memory into register

Branch operations enable

Non-linear program execution (jumps)

AND operation returns 1 when

Both bits are 1