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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT25PE80 датащи(PDF) 21 Page - Renesas Technology Corp |
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AT25PE80 датащи(HTML) 21 Page - Renesas Technology Corp |
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21 / 61 page  21 AT25PE80 DS-25PE80-141D–2/2022 8. Security Features 8.1 Security Register The device contains a specialized Security Register that can be used for purposes such as unique device serialization or locked key storage. The register is comprised of a total of 128 bytes (byte locations 0 through 127). All 128 bytes of the Security Register are factory programmed by Adesto and will contain a unique value for each device. The factory programmed data is fixed and cannot be changed. Table 8-1. Security Register 8.1.1 Reading the Security Register To read the Security Register, an opcode of 77h and three dummy bytes must be clocked into the device. After the last dummy bit has been clocked in, the contents of the Security Register can be clocked out on the SO pin. After the last byte of the Security Register has been read, additional pulses on the SCK pin will result in undefined data being output on the SO pin. Deasserting the CS pin will terminate the Read Security Register operation and put the SO pin into a high-impedance state. Figure 8-1. Read Security Register Security Register Byte Number 0 1 · · · · · · · · · 127 Data Type Factory Programmed by Adesto 77h XX XX XX Data n Data n + 1 CS Data n + x SI SO Each transition represents eight bits |
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