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KEELOQ with XTEA microcontroller-based transmitter with acknowledge

Posted: 30 Jul 2010 ?? ?Print Version ?Bookmark and Share

Keywords:microcontroller-based KEELOQ? hopping transmitter? encryption algorithm?

This application note describes the design of a microcontroller-based KEELOQ hopping transmitter with receiver acknowledge using the XTEA encryption algorithm. This transmitter is implemented on the Microchip PIC16F636 microcontroller. Descriptions of the encoding process, the encoding hardware and description of the software modules are included within this application note. The software was designed to emulate an HCS365 dual transmitter. This design can be used to implement a secure system transmitter that has the flexibility to be designed into various types of KEELOQ receiver/decoders. The acknowledge is achieved by using an MRF49XA transceiver.

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