Oscillation control circuit

1. Field of the Invention An oscillation control circuit is offered which can improve the startability of an oscillator circuit operating at high frequencies and at a low power-supply voltage. When the oscillation potential of the oscillation signal is between the inversion potential (1.2 volts) of a CMOS inverter IVand the inversion potential (1.8 volts) of a CMOS inverter IVthe logical output value of a CMOS Schmitt inverter SIis 1. The output of a CMOS inverter formed by MOS transistors Tand Tis shorted out via a MOS transistor TIts logical output value is kept at 1. When the inversion potential of the CMOS inverter IVor the inversion potential of the CMOS inverter IVis exceeded, if the input voltage to the CMOS Schmitt trigger SIincreases above its inversion potential (1.8 volts), the logical output value assumes a value of 0. The CMOS inverter formed by the MOS transistors Tand Tis first set into operation. The oscillation signal is inverted, setting a circuit LA at a later stage into operation.