Method of preventing unauthorized reproduction of a transmission code
US6046680A · kind A · utility
19Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1994 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Jun 15, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00849
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.