an embodiment of a communication system is provided , in which a high frequency oscillator generates a first high frequency signal upon receipt of no disable signal . the first high frequency signal is commonly shared by at least two modules . each module coupled to the high frequency oscillator operates in either busy or idle mode , wherein the module operates at the first high frequency signal when in busy mode , and asserts a request signal when in idle mode . a disablement unit , coupled to the first and second modules , asserts the disable signal to the high frequency oscillator when all of the request signals are asserted , thereby forcing the high frequency oscillator to cease the generation of the first high frequency signal .