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IC CARD

  • US 20080245878A1
  • Filed: 03/18/2008
  • Published: 10/09/2008
  • Est. Priority Date: 04/05/2007
  • Status: Abandoned Application
First Claim
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1. A semiconductor device comprising:

  • a first interface circuit for interfacing signals using second external terminals, upon receiving a clock input from a first external terminal;

    a second interface circuit for interfacing differential signals using the second external terminals, without receiving a clock input from the outside; and

    a selection control circuit for detecting an input of a plurality of first clocks from the first external signal at the start of power supply, and outputting an activation signal of a first instruction signal to enable the interface operation of the first interface circuit.

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