Option module using clock frequency, electric device, and methods therefor

摘要

An option module using a clock frequency, an electric device, and methods therefor. The option module is connectable to a main module and provides an additional function, and includes a power supply supplying a power, a clock generator receiving the power from the power supply and generating a clock having a particular frequency, and an interface chip interfacing the power supply and the clock generator and outputting the particular clock generated in the clock generator to the main module. As the option module is implemented with the simple signal protection circuit, the option module is profitable and expandable to various option module types with varying functions.