Electronic access control device

  • US 6,977,576 B2
  • Filed: 12/19/2001
  • Issued: 12/20/2005
  • Est. Priority Date: 11/15/1994
  • Status: Expired due to Fees
First Claim
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1. A method of entering a user-programmed access code into a battery-powered electronic access control device having a keypad and a microprocessor-based control circuit including a microprocessor and a memory storing a permanent access code, comprising:

  • pressing a first key on the keypad to enter the user-programmed access code and trigger a transition of the microprocessor from a sleep mode with reduced power consumption to an operation mode, the user-programmed access code comprising the first key and at least one subsequent keypad entry;

    pressing a program key on the keypad to indicate to the microprocessor initiation of a code programming operation, the program key being wired to one of multiple interrupt pins of the microprocessor;

    entering the permanent access code using alpha numerical keys on the keypad;

    after entering the permanent access code, entering the user-programmed access code using the alphanumerical keys of the keypad; and

    ,wherein the keys on the keypad that trigger a transition of the microprocessor from a sleep mode with reduced power consumption to an operation mode include the alpha numerical keys.

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