A variation in threshold may be suppressed by structuring an analog switch by a MOS transistor and forming a signal synchronized to a clock by making the clock which is a common signal in continuity or discontinuity. The invention is characterized in that control means R are provided upline of the winding shaft 1 to vary the rotational speed of the winding shaft in such a way that the winding shaft 1 has several periods in each revolution, where the angular velocity changes in a predetermined manner within each period. The data storage is usable to store local variables and temporary data and is configurable to operate in either a cache policy mode in which a miss results in an access of the external memory or in a scratch pad policy mode in which a miss does not result in an access of the external memory. A structural body supports the elastic strike layer, rigid plate and first sensor.