Phase-locked loop circuit, control method thereof and electronic device

A control method of the phase-locked loop circuit comprising the following steps:

• comparing phase of an external reference clock signal and phase of a comparing clock signal, and generating an error signal corresponding to the comparing result;
• generating an internal clock signal having oscillation frequency corresponding to the error signal;
• dividing frequency of the internal clock signal according to a pre-set dividing ratio, to generate the comparing clock signal;
• generating a control signal to respectively change connection of the oscillation unit and connection of the frequency dividing unit after comparing the phase of the external reference clock signal and the phase of the comparing clock signal.

An electronic device comprising:

• a phase frequency comparing unit, configured to compare phase of an external reference clock signal and phase of a comparing clock signal, and generate an error signal corresponding to the comparing result;
• an oscillation unit, configured to generate an internal clock signal having oscillation frequency corresponding to the error signal;
• a frequency dividing unit, configured to divide frequency of the internal clock signal according to a pre-set dividing ratio, to generate the comparing clock signal;
• a control unit, configured to generate a control signal to respectively change connection of the oscillation unit and connection of the frequency dividing unit after comparing the phase of the external reference clock signal and the phase of the comparing clock signal.