Provided are a data processor, and a control system, in which an interrupt controller and an event link controller are adopted. The control key unit is operable so as to control the processor unit to store periodically both temperature information corresponding to a digital temperature signal from the temperature detecting unit, and storage time information associated with the temperature information in the data storage unit. The present routing method ensures smooth operations of a copy and a merge node as well as an overall network. The scarifier has a plurality of teeth constructed and arranged to be moved with respect to the bucket between a stored, inoperative position, and an operative position with portions of the teeth extending outwardly with respect to a portion of the bottom wall of the bucket.