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Low power processor

  • US 20040158756A1
  • Filed: 02/02/2004
  • Published: 08/12/2004
  • Est. Priority Date: 11/21/1996
  • Status: Active Grant
First Claim
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1. A microprocessor comprising:

  • a main circuit including transistors;

    a substrate bias switching circuit for switching voltages of substrate biases applied to a substrate of said main circuit; and

    an operation mode control circuit for controlling, in response to execution of an instruction to proceed to a first mode in said main circuit, said substrate bias switching circuit in such a way that the substrate biases are switched over to voltages for the first mode, and for controlling, in response to execution of an instruction to proceed to a second mode in said main circuit, said substrate bias switching circuit in such a way that the substrate biases are switched over to voltages for the second mode, and also for starting, when switching the substrate biases from the voltages for the first mode over to the voltages for the second mode, the operation of said transistors of said main circuit after the bias voltages switched thereto have been stabilized.

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