Semiconductor integrated circuit device and microcomputer

A semiconductor integrated circuit comprising:

• a logic circuit which includes MIS transistors formed on a semiconductor substrate;
• a control circuit which controls the threshold voltage of the MIS transistors of said logic circuit;
• and
• an oscillation circuit which includes MIS transistors formed on said semiconductor substrate and produces an oscillation output having a frequency that is variable,
• said control circuit receiving a clock signal of a prescribed frequency and the oscillation output of said oscillation circuit and producing a first control signal by comparing the frequency of the oscillation output with the frequency of the clock signal, said oscillation circuit having its oscillation frequency controlled by the first control signal so as to be correspondent to the frequency of the clock signal through the control of the threshold voltage of the MIS transistors of said logic circuit by the first control signal, and the MIS transistors of 'said logic circuit having their threshold voltage controlled by a second control signal that corresponds to the first control signal.

A semiconductor integrated circuit comprising:

• a logic circuit which includes p-channel MIS transistors and n-channel MIS transistors formed on a semiconductor substrate;
• a oscillation circuit with variable oscillation frequency which includes p-channel MIS transistors and n-channel MIS transistors formed on-said semiconductor substrate;
• a control circuit which produces a control signal for controlling the threshold voltage of the p-channel and n-channel MIS transistors formed on said semiconductor substrate;
• and
• a clock signal supply circuit which produces a reference clock signal having a frequency correspondent with an operation mode,
• said control circuit receiving said reference clock signal and controlling said first oscillation circuit with the control signal so that the oscillation frequency of said oscillation circuit is correspondent with the frequency of the reference clock signal.

A semiconductor integrated circuit comprising:

• a first and second logic circuits comprising MIS transisters;
• a first and second oscillation circuits comprising MIS transisters having oscillation frequencies that are variable;
• a first control circuit which controls the threshold voltages of MIS transistors forming said first logic circuit and said first oscillation circuit;
• a second control circuit which controls the threshold voltages of MIS transistors forming said second logic circuit and said second oscillation circuit;
• and
• a first clock signal supply circuit which delivers a first reference clock signal having a frequency crrespondent with an operation mode to said first and second control circuits,
• said first control circuit controlling the frequency of the oscillation output of said first oscillation circuit so that it becomes equal to the frequency of said first reference clock signal, and said second control circuit controlling the frequency of the oscillation output of said second oscillation circuit so that it becomes equal to the frequency of said first reference clock signal.