HCSXXX

All of the KEELOQ^® devices are programmed using a serial method. This HCSXXX Serial mode allows KEELOQ devices to be programmed while in users' systems, which increases the flexibility of designing cryptographic encoders, decoders and transponders into electronic systems. While some of the HCSXXX devices are capable of being programmed through wireless communications, the subject of this document is focused on wired programmers that make contact with the KEELOQ products while the components are incircuit or in a programmer socket. Additionally, this programming specification only applies to all KEELOQ devices listed above in all packages.