A microelectronic component having a base and a plurality of conductive posts extending from said base. The state of charge of the lead acid storage battery is maintained in a range of 30 to 90% where the fully charged state of the lead acid storage battery is 100%; and the lead acid storage battery is charged and discharged while the battery voltage is kept in a specified range of 1. While, a CPU 39 of a light receiving unit 40 extracts a pixel area with a time sequence luminance variation pattern from a frame image captured into a capture image buffer 46, and binarizes the luminance variation pattern, and performs logic determination. As a result, platform resources and security are maintained. These methods can be used to implement a communication protocol between a DVD player and a microcontroller. In yet another embodiment, the novel network interface controller is employed in a computer system.