Instruction Set

• Instructions are a set of operations that need to be decoded in sequence - each operation is made up of an opcode and an operand
• Operand is the data which needs to be acted on or refers to registers in memory
• Opcode informs the CPU which operation needs to be done
• A number of allowed opcode exist, this is called the instruction set
• Instruction sets are low level language instructions that instruct the CPU how to carry out an operation