A mobile terminal and a control method thereof are disclosed. A step between a memory cell formed in a cell region and a transistor formed in a peripheral circuit region is minimized, and the height of a gate in the memory cell is minimized. IED variables may be mapped to associated network management protocol variables to allow the network management system to access the IED variables using the network management protocol. The pin and the bush are connected with one another through a notched thin-walled portion formed between the lower end of the pin and the ring portion of the bush.