PURPOSE: To secure the normal stepping of hands by chopper amplification of an induced current in a coil of a step motor at a specified time to detect any halt of a rotor.

CONSTITUTION: When a drive pulse with a specified width is applied to a coil 27 through switching elements 15W17, a step motor turns. After the application of the drive pulse, an induced current in the coil 27 is detected with chopper amplification resistance elements 23 and 24 before a detedting pulse is applied corresponding to the stop position of a rotor through rotor turning resistance elements 25 and 26. With the generation of an opposite current, any halt of the rotor can be detected accurately. In this case, as a correction correction pulse is applied, the rotor stops at the normal stable point thereby always securing the normal stepping of hands.