A communications apparatus is provided. The assembly includes a substantially cylindrical button having a volumetrically reduced region and a complementary, internally threaded die button extractor having a foot portion extending into the volumetrically reduced region and facilitating removal of the button from the body die via an upward force applied to the internally threaded portion. The switching circuit switches between whether a parallel interface with the outside is to be used as a big endian or a little endian. The unit frame has a leading side and a trailing side with respect to the predetermined direction. The P well regions are oppositely disposed with an N well region interposed therebetween. The soldering sections of the terminals pass through the corresponding channels and are supported by the support section to be soldered with cables.