Abstract: An electronic device and a method of operating the same are disclosed, where the electronic device includes a main system, a battery, and a battery device power protection and reset circuit The battery device power protection and reset circuit includes a charging circuit and a switch device. The switch device connects the battery and the main system. The charging circuit turns off the switch device when operating under a first trigger mode, so that the switch device can electrically isolate the main system from the battery.

Abstract: The present application discloses a power line communication method and an electronic system and an external device using the same. The external device using the power line communication method is electrically connected to an electronic device via a transmit line and comprises: a voltage detecting module configured to detect a voltage variance of a signal voltage supplied by the electronic device; a processing module retrieving a message according to the voltage variance and processing the message to generate a message to be transmitted; and a load modulation module having a load and modulating a load value of the load according to the message to be transmitted.