A semiconductor apparatus including a register input selection block configured to serially receive input data and output the input data in parallel as first and second data sets, or receive register selection output signals and output the register selection output signals as the first and second data sets, in response to a shift control signal and a capture control signal; a first data register configured to receive and store the first data set and output stored data as first register output signals; a second data register configured to receive and store the first and second data sets and output stored data as second register output signals; a register output selection block configured to output ones of the first and second register output signals as the register selection output signals; and a data output selection block configured to serially output one of the first and second data sets as output data.