Method and device for automatically adjusting clock frequency of system in real time

The invention belongs to the field of integrated circuits and in particular relates to a method and a device for automatically adjusting the clock frequency or the power supply voltage of a processor system in real time. The method realizes automatic and real-time adjustment of the clock frequency or the power supply voltage of the processor system by a matching step, a judging step and an adjusting step. In the running process of a processor, the clock frequency or the power supply voltage of the processor system is automatically adjusted in real time, so that the processor runs with an optimal clock frequency or an optimal power supply voltage in real time. Therefore, normal running of the system is ensured and the power consumption of the processor can be effectively lowered.