Encoder and decoder microchips suitable for use in remote control devices, are disclosed. The encoder microchip comprises means for performing an encoding function on an identification number embedded in the said microchip and a combination of a unit number and a stepping counter value, so as to generate...http://www.google.com/patents/US20040093500?utm_source=gb-gplus-sharePatent US20040093500 - Method of communication using an encoder microchip and a decoder microchip
