Method and apparatus for setting reference that is for preventing electromagnetic interference and touch sensor using the same

A method and an apparatus for setting reference that is for preventing electromagnetic interference, and a touch sensor using the same are provided to operate a touch sensing apparatus normally. A method and an apparatus for setting reference that is for preventing electromagnetic interference comprises the steps of: judging whether or not a count value is changed during preset time(S406), wherein the count value is the value caused by a change of capacitance of a touch sensing device; changing a frequency to a preset frequency when the count value is not changed for the preset time(S414), wherein the frequency occurs the change of capacitance; and changing a count enable value(S416), wherein count enable value performs the computation of the count value according to the changed frequency.