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Microprocessor, semiconductor module and data processing system

  • US 20020019898A1
  • Filed: 07/05/2001
  • Published: 02/14/2002
  • Est. Priority Date: 07/27/2000
  • Status: Abandoned Application
First Claim
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1. A microprocessor built on a semiconductor chip comprising:

  • a central processing unit for executing instructions; and

    an external bus interface control circuit which controls an external bus on the basis of execution of instructions by said central processing unit, wherein said external bus interface control circuit is capable of selecting one of a plurality of external device select signals corresponding to an external access address and activating said selected external device select signal, and wherein said microprocessor further comprises a clock switching control circuit for controlling an operation to switch a synchronous clock signal of said external bus interface control circuit in accordance with said external device select signal activated by said external bus interface control circuit.

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