Patent ID: 7969115

Claim:
A motor drive circuit operable in a first mode in response to an input signal according to a parallel input and operable in a second mode in response to an input signal according to a clock input mode, the motor drive circuit comprising: a signal generation unit arranged to output a control signal according to the parallel input mode in response to the parallel input mode input signal when operated in the first mode and to generate and output a control signal according to the parallel input mode in response to the clock input mode input signal when operated in the second mode; and a drive unit arranged to drive a motor, in response to the control signal according to the parallel input mode in both the first and second modes, wherein the parallel input mode input signal and the control signal include information indicating an amount of exciting current passing through the motor, and wherein the clock input mode input signal includes information indicating an angle of rotation per unit time of the motor and information indicating the unit time.