摘要:
A frequency calibration method for a programmable oscillator includes the steps of: counting an oversampling number of an oversampling signal and estimating an accumulated bit number of a USB data stream according to the oversampling signal; calculating a difference between the oversampling number and M times of the accumulated bit number when the accumulated bit number is larger than a predetermined value; and determining a frequency calibration step of the oversampling signal according to the difference. The present invention further provides a frequency calibration device for a programmable oscillator.
摘要:
A frequency calibration method for a programmable oscillator includes the steps of: counting an oversampling number of an oversampling signal and estimating an accumulated bit number of a USB data stream according to the oversampling signal; calculating a difference between the oversampling number and M times of the accumulated bit number when the accumulated bit number is larger than or equal to a predetermined value; and determining a frequency calibration step of the oversampling signal according to the difference. The present invention further provides a frequency calibration device for a programmable oscillator.
摘要:
There is provided a human interface device including a control chip and a plurality of control components. The control chip includes a voltage detection circuit coupled to the plurality of control components via a multiplexing pin and detects a voltage value on the multiplexing pin through the voltage detection circuit thereby identifying an operating state of the plurality of control components.
摘要:
There is provided a mouse device including a control chip and at least one control component. The control chip includes a voltage detection circuit coupled to the at least one control component through at least one multiplexing pin and detects at least one voltage value on the at least one multiplexing pin using the voltage detection circuit thereby identifying an operating state of the at least one control component.
摘要:
A clock frequency adjusting method includes the steps of: calculating a phase difference between a local signal and SOF signals or EOP signals in an external signal; counting a count value of the phase difference based on a clock frequency of a local oscillator; and adjusting the clock frequency according to the count value. The present invention further provides a clock frequency adjusting circuit.
摘要:
A method for automatically adjusting the clock frequency for a USB interface including the steps of: generating a clock signal with an adjustable frequency; receiving a USB differential signal; counting the clock signal based on each frame time of the USB differential signal and obtaining a count value; and adjusting the frequency of the clock signal when the count value exceeds a predetermined count range. The present invention further provides a clock frequency adjusting circuit.