Device generator of a clock signal and implementation method

for a processor device (150) of a control apparatus (10) connected to a network, and implementing process. The device providing the clock signal comprises a first oscillator (130) providing a first clock signal applied to the processor (150) and a controlled modification device (135) for changing the first clock signal of the first oscillator (130 ). It also includes a control device (120) connected to a network for generating a modification of the installation of control signal (135) according to the communication signals transmitted by the network. This structure provides a simple and flexible frequency tuning of the required clock signal to the processor (150).