Patent ID: 8094522

Claim:
An electronic clock comprising: a step motor having a coil and a rotor; a drive pulse generating means configured to generate a drive pulse to drive the step motor; a step motor driving means configured to drive the step motor based on the drive pulse; a rotor rotation detecting means configured to detect a rotation status of the rotor based on an induced voltage generated in the coil; a first detection/determination means configured to determine rotation or non-rotation of the rotor based on a detection signal outputted by the rotor rotation detecting means; and a second detection/determination means configured to determine whether rotation or non-rotation of the rotor occurs within a determination period based on a detection signal outputted by the rotor rotation detecting means, the determination of whether rotation or non-rotation of the rotor occurs being performed after determination by the first detection/determination means, wherein the second detection/determination means is configured to change the determination period of the second detection/determination means based on whether or not a determination time required for the determination by the first detection/determination means is shorter than a predetermined length of time.