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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP79400 датащи(PDF) 22 Page - Microchip Technology |
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MCP79400 датащи(HTML) 22 Page - Microchip Technology |
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22 / 42 page  MCP7940X DS25009C-page 22 2011 Microchip Technology Inc. FIGURE 6-5: RANDOM READ (UNIQUE ID SHOWN) FIGURE 6-6: SEQUENTIAL READ (UNIQUE ID SHOWN) 6.3 Unique ID The MCP7940X features an additional 64-bit unique ID area. The unique ID is located at addresses 0xF0 through 0xF7. Reading the unique ID requires the user to simply address these bytes. The unique ID area is protected to prevent unintended writes to these locations. The unlock sequence is detailed in Section 5.2.1 “Unlock Sequence”. The unique ID can be factory programmed on some devices to provide a unique IEEE EUI-48 or EUI-64 value. In addition, customer-provided codes can also be programmed. BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY A C K N O A C K A C K A C K S T O P S T A R T CONTROL BYTE ADDRESS BYTE CONTROL BYTE DATA BYTE S T A R T S 1 010 0 111 S 10 10 1 P BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY CONTROL BYTE DATA n DATA n + 1 DATA n + 2 DATA n + X N O A C K A C K A C K A C K A C K S T O P P |
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