1. An electronic sphygmomanometer comprising:cuff (20) is put on the measuring pointunit (51-54) and release inflation configured to adjust the pressure applied to the cuffa plurality of sensors (321, 322) pressure connected to the cuffa plurality of circuits (331, 332) of generation provided in coordination with the corresponding plurality of pressure sensors that give a square wave signal with a frequency based on the pressurecircuitry (335) generating a tuning circuit, both provided by a common circuit for generating a plurality of circuits, which allows passage of the output signal from one of the plurality of generating circuits andcircuitry (100) controls, adapted to obtain at the input of the square-wave signal generation and calculating blood pressure on the tuning circuit circuitry rectangular signal frequency.2. The electronic sphygmomanometer according to claim 1,wherein generation circuit setting circuit comprises a logic circuit (AD), comprising a plurality of input locations (IP1, IP2) of the compound that receive input signals from a corresponding plurality of generating circuits, which outputs a signal based on the result of a logic routine performed by the signals applied to the a plurality of input connection points.3. The electronic sphygmomanometer according to claim 2,wherein each of the generation circuits produces a rectangular signal with a frequency based on the pressure when generating circuit is connected in accordance with the command, and outputs the constant voltage signal when generating circuit is connected.4. The electronic sphygmomanometer according to claim 1,wherein the control circuit switches from the plurality of generating circuits generating circuit which is connected, by issuing a connect signal to generate a plurality of circuits.5. The electronic sphygmomanometer according to claim 4,wherein the control circuit outputs a first connection signal generating circuit in the first of the plurality of generating circuits and the
