Circuit which supplies a clock pulse to a microcomputer

A microcomputer system comprising:

• a microcomputer;
• a sinusoidal wave oscillation circuit;
• and
• a sinusoidal wave/pulse converting circuit which converts an oscillation output of the sinusoidal wave oscillation circuit into a clock pulse when the oscillation output exceeds a predetermined value, said sinusoidal wave/pulse converting circuit supplying the clock pulse to the microcomputer, wherein said sinusoidal wave/pulse converting circuit comprises:
• a first inverter, connected to said sinusoidal wave oscillation circuit, said first inverter having a threshold value on a high voltage side of a central level of an amplitude of the oscillation output;
• a second inverter, connected to said sinusoidal wave oscillation circuit, said second inverter having a threshold value on a low voltage side of the central level of the amplitude of the oscillation output;
• a third inverter, connected to an output of said second inverter, said third inverter inverts an output pulse of the second inverter;
• and
• a reset-set flip flop, connected to said first inverter, said third inverter, and said microcomputer, said reset flip-flop generates a clock pulse whose level changes alternately by an output of the first inverter and an output of the third inverter.