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Microprocessor with single pin for memory wipe

  • US 5,515,540 A
  • Filed: 12/28/1993
  • Issued: 05/07/1996
  • Est. Priority Date: 08/27/1990
  • Status: Expired due to Term
First Claim
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1. A nonvolatile microprocessor-controlled module, comprising:

  • encryption circuitry, said encryption circuitry including encryption registers;

    power management circuitry having power input nodes;

    a battery, said power input nodes coupled to said battery and to an external power supply terminal;

    a volatile memory;

    security violation detectors to detect a security violation;

    a microcontroller coupled to supply power via said power management circuitry to said volatile memory and to control said encryption registers, said security violation detectors coupled to said microcontroller;

    and wherein when a security violation is detected by said security violation detectors, said security violation detectors rewrite said encryption registers to a known value.

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