This application note describes the working of a KEELOQ ® code hopping decoder implemented on a Microchip Midrange MCUs (PIC16C6X, PIC16C7X, PIC16C62X) The software can be used to implement a stand alone decoder or be integrated with the user application. The decoder supports the Microchip’s HCS200, HCS201, HCS300, HCS301, HCS360, and HCS361 KEEL OQ hopping code encoders. The decoder supports normal and secure learning. Two manufactur - ers codes allow different manufacturers to share a pub - lic key, but retain their own private keys. AN672 PIC MCU Mid-Range Code Hopping Decoder Author: Vivien Delport FIGURE 1: MICROCHIP MIDRANGE Microchip Technology Inc. DECODER OVERVIEW LRNIN 1 18 RFIN This application note describes the working of a LRNOUT 2 17 NC KEELOQ code hopping decoder implemented on a NC 3 16 OSCIN Microchip Midrange MCUs (PIC16C6X, PIC16C7X, ……