Method for adjusting the operating frequency of an electronic watch

A method of adjusting an operating frequency of an electronic watch with a computer application installed in a portable electronic device comprising first processing circuitry, a light source, and a screen, wherein the electronic watch comprises an electronic module including an oscillator, and a frequency divider circuit arranged downstream of the oscillator and configured to transmit a pulsed signal corresponding to the operating frequency, an operating frequency adjustment circuit including a memory storing an inhibition value, the operating frequency adjustment circuit being configured to send an inhibition signal to inhibit one or more pulses transmitted by the frequency divider circuit based on the stored inhibition value, a communication unit configured to communicate with the portable electronic device, the communication unit including an optical sensor arranged to receive a modulated optical signal in a form of a sequence of optical pulses, and second processing circuitry configured to control the operating frequency adjustment circuit based on the modulated optical signal received by the communication unit, the method comprising:

• generating, by the first processing circuitry, a pulsed reference signal,
• converting the pulsed reference signal into a modulated optical signal including light pulses,
• transmitting, by the first processing circuitry to the optical sensor of the communication unit of the electronic watch, the modulated optical signal via the light source or via a modulation of the light emitted by the screen of the portable electronic device,
• reconstituting, by the second processing circuitry, the pulsed reference signal from the modulated optical signal received by the optical sensor,
• correcting the inhibition value stored in the memory of the operating frequency adjustment circuit based on the pulsed reference signal, and
• transmitting, from the operating frequency adjustment circuit to the frequency divider circuit, an inhibition signal based on the corrected inhibition value, the transmitting being performed periodically based on a control signal sent from the frequency dividing circuit to the operating frequency adjustment circuit.