Memory system and method of operating the memory system

A method of operating a memory device including a backup block and a data block, the method comprising:

• receiving a backup command indicating occurrence of a sudden power off during a program operation of storing data received from an outside in the data block;
• performing a reset operation of maintaining a state in which the data is buffered during the program operation in a plurality of page buffers and resetting a peripheral circuit that performs the program operation except for the page buffers;
• and
• performing a backup program operation of storing the data in the backup block.

A memory system comprising:

• a memory device including a backup block and a data block;
• and
• a memory controller configured to control the memory device,
• wherein the memory controller comprises:
• a sudden power off (SPO) sensor configured to monitor power input from an outside and sense occurrence of a SPO;
• and
• a central processing unit (CPU) configured to generate a backup command instructing the memory device to store data stored in the data block in the backup block in response to the occurrence of the SPO,
• the memory device performs a reset operation of stopping a program operation of storing the data in the data block and a backup program operation of storing the data corresponding to the program operation in the backup block when the backup command is received from the memory controller, and
• the reset operation is an operation of maintaining the data and resetting the memory device except for at least one page buffer included in the memory device.