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This application note describes the design of a
microcontroller-based K EELOQ
®
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.
AN1328
KEELOQ with XTEA Microcontroller-Based Transmitter
with Acknowledge
Operation
Author: Cristian Toma
Microchip Technology Inc. 2.0-5.5V operation
Four-button inputs
Automatic packet retry feature
INTRODUCTION
Nonvolatile synchronization data
This application note describes the design of a FSK modulation (handled internally by the
microcontroller-based KEELOQ Hopping transmitter MRF49XA)

关键词： KEELOQ   XTEA   发射器与应答