The invention relates to a multitask processing system including a data bus and a command bus. An output stage is coupled between the first and second input stages and the output node. In particular, the channel region is formed to surround the source region while the drain region is formed outside the channel region so that the effective channel width adjoining the source region may be different from that adjoining the drain region. The inner and outer surfaces of a tire are measured based on the measurements by an inner surface measuring device provided with three laser distance meters mounted to the measuring head and an outer surface measuring device having a laser distance meter and the displacement change measurement of the measuring head by the height displacement measuring device. The deasserted signal may be asserted when an on-chip processor enters a low power state. Another aspect of the invention provides methods for allocating objects in the heap memory.