A system LSI including a semiconductor chip which receives power from a power supply, and an electronic timer which measures a time from an interruption of power supplying to the semiconductor chip to a resumption of power supplying to the semiconductor chip. In embodiments, for example, the invention takes advantage of the slow flow rate that usually occurs where blood exits the microtubules into a header area of the filter to provide a settling area. Both the well region and adjacent edge termination zone are disposed at an upper surface of the upper layer, and an oxide layer overlies the upper layer and the edge termination zone.