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Portable medium

  • US 4,814,591 A
  • Filed: 03/30/1988
  • Issued: 03/21/1989
  • Est. Priority Date: 04/13/1987
  • Status: Expired due to Fees
First Claim
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1. A portable medium having a control element which controls a data memory, comprising:

  • input means for inputting various instructions for causing said control element to perform various operations;

    first clock means for generating a clock signal of a first frequency;

    second clock means for generating a clock signal of a second frequency which is higher than that of the first frequency; and

    clock control means for causing said second clock means to start generating the clock signal, in response to an instruction supplied from said input means, for supplying the clock signal of the first frequency generated by said first clock means to said control element, and, when the next instruction is supplied from said input means, for supplying the clock signal of the second frequency generated by said second clock means to said control element.

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