| 摘要 |
PURPOSE:To reduce the number of circuits by performing positive number/ negative number conversion by outputting selectively inversion data to a multiplexer, and inputting selectively and outputting the output data of an adder circuit to the multiplexer by latching. CONSTITUTION:Data D0-Dm and the inversion data by inverters I0-Im are inputted to the multiplexer 1', and the output of the multiplexer and that of a decoder 4 are inputted to the adder circuit 3. And when the value of the input signal D of the decoder 4 is set at n(m+1>n>0, 1) is outputted to an output terminal at an (n+1)th bit counting from a highest order, and 0 to another output termi nal, respectively. And the output of the circuit 3 is latched at a register 5 corre sponding to a control signal E, then, it is inputted to the multiplexer 1', and either three input data of the multiplexer 1' is selected corresponding to a control signal C, and is inputted to the circuit 3. |
