An open load and a supply fault are differentiated between and detected with a simple configuration. According to this constitution, the communication apparatus assigned a plurality of source addresses can select a source address corresponding to a network having the optimal communication path among a plurality of networks and communicate using the selected source address. Also, a mode register 28 is formed to be used as a switch signal to switch the data transfer circuit to either DDR type or SDR type. Subsequently, a multi-layer structure of semiconductor crystals in an LED is formed through crystal growth of a Group III nitride compound semiconductor. The timing element includes exactly one energy storage element which is represented as a capacitor. A mantle layer is disposed over the core and a cover is disposed over the mantle.