Memory system

A memory system comprising:

• a storage device storing a plurality of instructions;
• and
• a central processing unit processing an instruction fetched from the storage device, wherein the central processing unit detects a change in the instruction fetched from the storage device while processing the instruction,
• wherein the central processing unit processes a security instruction set to detect whether the instruction fetched from the storage device is changed, the security instruction set including:
• the instruction fetched from the storage device;
• and
• an error detector code value of the instruction, wherein the central processing unit performs a compare operation to compare the instruction fetched from the storage device with the error detector code value,
• wherein the storage device stores the security instruction set, wherein the security instruction set is automatically generated during a code compile operation of an instruction program including the plurality of instructions, and
• wherein the security instruction set includes a compare instruction and the central processing unit performs the compare operation by executing the compare instruction.