MODE SWITCHING CIRCUIT FOR DATA PROCESSING

PURPOSE:To curtail the power consumption without operating a data processing circuit which is not selected by controlling a clock inputted to the data processing circuit by using a selecting signal, and supplying the clock to only the selected data processing circuit. CONSTITUTION:Data inputted from a data input terminal 11 is supplied simulta neously to a first data processing circuit and a second data processing circuit 2. A first data processing circuit 1 and a second data processing circuit 2 input data and a clock, execute a data processing, and output signals S1,S2, respective ly. A selecting circuit 3 inputs a first data processing circuit output signal S1, a second data processing circuit output signal S2, and a selecting signal from a selecting signal input terminal 13, and outputs a selecting circuit output signal S3. In such a state, the clock is supplied to only the data processing circuit selected by the selecting circuit 3, and the data processing circuit which is not selected by the selecting circuit 3 does not operate since the clock is not supplied. In such a way, the power consumptiom can be curtailed.