Abstract: It is an object to control the rotation of a motor for driving clock hands more reliably and to prevent abnormal wear and breakage of components due to an overload. When a rotation detecting circuit detects that a motor has not been rotated by a normal driving pulse, a control circuit controls the rotation of the motor with a corrective driving pulse having a pulse width greater than that of the normal driving pulse. When the rotation detecting circuit detects that the motor has not been rotated even by the corrective driving pulse, it stops controlling the rotation of the motor and notifies the fact that the movement of the hands of the clock has stopped with a notifying device.

Abstract: An output of an oscillating circuit is inputted to a system clock generating circuit, and a CPU performing various arithmetic processes is operated by this system clock. In order to operate a chopping pulse generating circuit and a one-shot pulse generating circuit, the CPU enters into an interrupt operation by means of an interrupt signal from an interrupt signal generating circuit, pulse information of a pulse rank storage circuit which stores a duty width of the chopping pulse generating circuit and pulse information of the one-shot pulse generating circuit, are independently controlled by means of rotation detection information of a rotation detecting circuit in previous driving of a motor, and the motor is driven by means of motor driving pulses formed by the chopping pulse generating circuit and the one-shot pulse generating circuit.