AN744 Datasheet - Microchip

AN744 Modular Mid-Range PICmicro KEELOQ Decoder

of the Normal Learn key generation scheme can be found in Technical Brief TB003 "An Introduction To KEELOQ Code Hopping" [DS91002]. More advanced Key Generation Schemes can be implemented replacing this module with the techniques described in Technical Brief TB001 "Secure Learning RKE Systems Using .

M Author: AN744 FIGURE 1: Modular Mid-Range PICmicro® KEELOQ® Decoder in C DECODER PIN OUT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 NU NU VLOW LEARNOUT OUT3 OUT2 OUT1 OUT0 VDD VSS NU NU NU NU Lucio Di Jasio Microchip Technology Inc. MCLR LRNOUT RFIN NU NU LEARN NU VSS OSCIN OSCOUT NU NU NU OVERVIEW This application note describes a KEELOQ code hopping decoder implemented on a Microchip Mid-range Enhanced FLASH MCU (PIC16F872). The software has been designed.

AN744 Features

* The set of modules presented in this application note implement the following features:

* Source compatible with HITECH and CCS C compilers

* Pin out compatible with PICDEM-2 board

* Normal Learn mode

* Learn up to 8 transmitters, using the internal EEPROM memory of P

AN744-Microchip.pdf