Oscillator apparatus and oscillation method

An oscillation method of an oscillation apparatus, the oscillation method comprising:

• acquiring an adjustment code of a resistor switch of an adjustment section of the oscillation apparatus based on an external reference resistor;
• applying the acquired adjustment code to a resistance value of a resistor that constitutes an oscillation section of the oscillation apparatus, wherein the oscillation section is configured to oscillate a clock signal;
• changing a parameter of the resistor that constitutes the oscillation section based on the applied adjustment code;
• adjusting a frequency of the clock signal to a first range based on the changed parameter, wherein the first range is permitted in an application of the clock signal;
• controlling the adjustment section of the oscillation apparatus to perform frequency calibration of the oscillation section, wherein the frequency calibration of the oscillation section is performed based on a variation in the frequency of the clock signal oscillated by the oscillation section that falls within a second range exceeding the first range permitted in the application of the clock signal;
• and
• supplying the clock signal to a subsequent stage after the frequency calibration in which the variation in the frequency falls within the first range.

An oscillation apparatus, comprising:

• an oscillation section comprising a capacitor, wherein the oscillation section is configured to oscillate a clock signal;
• an adjustment section comprising a capacitor switch, wherein the adjustment section is configured to:
• acquire an adjustment code of the capacitor switch based on an external reference capacitor;
• apply the acquired adjustment code to a capacitance value of the capacitor that constitutes the oscillation section;
• change a parameter of the capacitor that constitutes the oscillation section based on the applied adjustment code;
• and
• adjust a frequency of the clock signal to a first range based on the changed parameter, wherein the first range is permitted in an application of the clock signal;
• and
• a calibration control section configured to control the adjustment section to perform frequency calibration of the oscillation section, wherein the frequency calibration of the oscillation section is performed based on a variation in the frequency of the clock signal oscillated by the oscillation section that falls within a second range exceeding the first range permitted in the application of the clock signal.