SEMICONDUCTOR INTEGRATED CIRCUIT

PURPOSE:To prevent an unnecessary task from initiating an interruption and to obtain flexible processing program constitution by deciding task generation and performing task switching when a comparison type timer for task data for task selective switching initiates an interruption. CONSTITUTION:A task generation decision control circuit 12 outputs a data pointer 13 for task generation decision making which indicates corresponding task generation decision data in a task generation decision data storage circuit 11 stored with plural task generation decision data and outputs a task generation signal according to task generation decision data indicated by a data pointer 13 for task generation decision making when a coincidence detection output is sent out. A task switching control circuit 8 controls a pointer for task data indicating corresponding task data in a task data storage circuit 7 stored with plural task data and its output is sent to a central processing unit 10. Consequently, unnecessary interruption processing is prevented and a processing program is made flexible.