A power train for an automotive transmission includes first and second planetary gear sets disposed around an input shaft. The device includes a first reflector and a second reflector defining an optical cavity therebetween that is selective of a visible wavelength at an intensity. During the execution of the task-2, a task switch controller controls switches to select the first program counter, first memory devices of a processing pipeline circuit, and the first register file to save data stored in them in a save memory.