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HCS512 Datasheet(PDF) 9 Page - Microchip Technology |
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HCS512 Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 26 page  © 2002 Microchip Technology Inc. DS40151D-page 9 HCS512 5.0 INTEGRATING THE HCS512 INTO A SYSTEM The HCS512 can act as a stand-alone decoder or be interfaced to a microcontroller. Typical stand-alone applications include garage door openers and elec- tronic door locks. In stand-alone applications, the HCS512 will handle learning, reception, decryption, and validation of the received code; and generate the appropriate output. For a garage door opener, the HCS512 input will be connected to an RF receiver, and the output, to a relay driver to connect a motor control- ler. Typical systems where the HCS512 will be connected to a microcontroller include vehicle and home security systems. The HCS512 input will be connected to an RF receiver and the function outputs to the microcontroller. The HCS512 will handle all the decoding functions and the microcontroller, all the system functions. The Serial Output mode with a 1- or 2-wire interface can be used if the microcontroller is I/O limited. 6.0 DECODER PROGRAMMING The PG306001 production programmer will allow easy setup and programming of the configuration byte and the manufacturer’s code. 6.1 Configuration Byte The configuration byte is used to set system configura- tion for the decoder. The LRN bits determine which algorithm (Decrypt or XOR) is used for the key genera- tion. SC_LRN determines whether normal learn (key derived from serial number) or secure learn (key derived from seed value) is used. TABLE 6-1: CONFIGURATION BYTE TABLE 6-2: LEARN METHOD LRN0, LRN1 DEFINITIONS Bit Name Description 0 LRN0 Learn algorithm select 1 LRN1 Not used 2 SC_LRN Secure Learn enable (1 = enabled) 3 SLEEP SLEEP enable (1 = enabled) 4 RES1 Not used 5 RES2 Not used 6 RES3 Not used 7 RES4 Not used LRN0 Description 0 Decrypt algorithm 1 XOR algorithm |
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