A method and apparatus for providing one of two clock signals to a processor based on a reference signal. An electronic component includes a processor, a first clock source configured to provide a first clock signal, an interface for receiving a second clock signal, and a reference signal line. The first clock signal is applied to the processor if a first reference signal is applied to the reference signal line, and the second clock signal is applied to the processor if a second reference signal is applied to the reference signal line.