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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HCS410 датащи(PDF) 23 Page - Microchip Technology |
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HCS410 датащи(HTML) 23 Page - Microchip Technology |
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23 / 36 page  HCS410 © 1997 Microchip Technology Inc. Preliminary DS40158C-page 23 4.0 INTEGRATING THE HCS410 INTO A SYSTEM Use of the HCS410 in a system requires a compatible decoder. This decoder is typically a microcontroller with compatible firmware. Firmware routines that accept transmissions from the HCS410, decrypt the code hop- ping portion of the data stream and perform IFF func- tions are available. These routines provide system designers the means to develop their own decoding system. 4.1 Key Generation The serial number for each transmitter is programmed by the manufacturer at the time of production. The generation of the encoder key is done using a key gen- eration algorithm (Figure 4-1). Typically, inputs to the key generation algorithm are the serial number of the transmitter or seed value, and a 64-bit manufacturer’s code. The manufacturer’s code is chosen by the system manufacturer and must be carefully controlled. The manufacturer’s code is a pivotal part of the overall system security. FIGURE 4-1: CREATION AND STORAGE OF ENCODER KEY DURING PRODUCTION Transmitter Manufacturer’s Serial Number or Code Encoder Key Key Generation Algorithm Serial Number Encoder Key Sync Counter . . . HCS410 EEPROM Array Seed |
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