Method of preventing unauthorized reproduction of a transmission code
First Claim
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1. A method for preventing unauthorized learning and reproduction of an access code in a combined receiver/transmitter system comprising the steps of:
- setting a flag in a memory of an integrated circuit upon the first time the integrated circuit is placed in a learn mode while configured as a receiver; and
checking the flag if the integrated circuit is later configured as a transmitter; and
modifying the code if the flag is set.
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Abstract
An integrated circuit (IC) configurable as transmitter/receiver includes a method of preventing unauthorized learning and reproduction of an access code as a security measure. When the IC is configured as a receiver and placed in the learn mode, a flag is set in a memory of a microcontroller. If later configured as a transmitter, the microcontroller checks the flag upon power up and if the flag is set, the stored code is randomized so transmission of it is impossible.
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Citations
5 Claims
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1. A method for preventing unauthorized learning and reproduction of an access code in a combined receiver/transmitter system comprising the steps of:
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setting a flag in a memory of an integrated circuit upon the first time the integrated circuit is placed in a learn mode while configured as a receiver; and checking the flag if the integrated circuit is later configured as a transmitter; and modifying the code if the flag is set. - View Dependent Claims (2)
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3. A method of preventing unauthorized learning and reproduction of an access code in an integrated circuit configurable as a receiver and configurable as a transmitter, comprising the steps of:
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configuring an integrated circuit as a receiver; receiving a transmitted access code; storing the access code in the integrated circuit configured as a receiver; setting a flag in the integrated circuit configured as a receiver; reconfiguring the integrated circuit as a transmitter; checking the flag; and denying transmission of the access code if the flag is set. - View Dependent Claims (4, 5)
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Specification