Electronic meter for concurrently updating firmware and collecting meter usage with a micro controller calculates the usage when a reset time is longer than a predetermined period of storing time

An electronic apparatus operable during program updating, the electronic apparatus comprising:

• an operation unit configured to perform a preset operation;
• a micro controller configured to
• control a result of the operation of the operation unit to be stored according to a predetermined period of storing time, and
• control a program received from outside to be stored;
• an update controller configured to reset the micro controller for a predetermined time to allow the program stored during the predetermined period of storing time to be updated in the micro controller;
• and
• a storing unit configured to store the program and the result of the operation of the operation unit under control of the micro controller, wherein
• the micro controller is configured to calculate the result of the operation of the operation unit for a reset time when the reset time is longer than the predetermined period of storing time.