Patent ID: 7496006

Claim:
An optical disc controller for servo-controlling an optical head, a disc motor, and a light beam in an optical disc device comprising the disc motor and the optical head, the disc motor rotating an optical disc, the optical head emitting a light beam for recording data on the optical disc and/or reproducing data from the optical disc, the optical disc controller, comprising: an interrupt signal generating section for generating an interrupt signal in each one of a plurality of predetermined time periods, and a control section which receives a digital signal indicating a current state or a deviation from a target value from the optical head and the disc motor of the optical disc device and performs a plurality of operations according to the digital signal so as to obtain and output a control signal indicating a control amount, and an input/output section which receives an electric signal, converts the electric signal into the digital signal, outputs the digital signal to the control section, receives a control signal from the control section, converts the control signal into an analog signal, and outputs the analog signal to the optical head and the disc motor, wherein (a) the control section performs the plurality of operations every time the interrupt signal is received from the interrupt signal generating section, (b) the control section stops operating and goes into a sleep mode at least for a predetermined time period between reception of the interrupt signal and reception of a subsequent interrupt signal, (c) the control section receives the digital signal and outputs the control signal for each of the operations, (d) the control section goes into the sleep mode after performing one of the operations, and (e) the control section resumes operation from the sleep mode several clocks before completion of conversion of the electric signal to the digital signal after the input/output section receives the electric signal for a subsequent operation.