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Semiconductor integrated circuit, semiconductor device, and electronic equipment comprising the same

  • US 6,249,167 B1
  • Filed: 06/03/1999
  • Issued: 06/19/2001
  • Est. Priority Date: 07/03/1997
  • Status: Expired due to Term
First Claim
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1. A semiconductor integrated circuit comprising:

  • at least one first semiconductor circuit operating on the basis of at least one first clock signal;

    at least one second semiconductor circuit that assists said first semiconductor circuit, operating on the basis of a request from said first semiconductor circuit and at least one second clock signal independent of said first clock signal; and

    a halt device that causes said second clock signal to halt, said halt device comprising;

    a control signal generation device that generates at least one clock control signal for controlling halting and non-halting of said second clock signal;

    an operation control device that controls halting of operation of said second clock signal, based on said clock control signal;

    a setting device that causes a halt period to be set for said second clock signal, based on a request from said first semiconductor circuit; and

    a counter device that counts an operating period of said second clock signal and outputs the counted counter value to said operation control device;

    said operation control device outputting said clock control signal of said control signal generation device, to halt said second clock signal, when said counter value has reached said halt period.

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