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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT88SC0104C датащи(PDF) 32 Page - ATMEL Corporation |
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AT88SC0104C датащи(HTML) 32 Page - ATMEL Corporation |
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32 / 58 page  29 5210B–SMIC–11/08 AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C Figure 7-4. Write User Zone 7.6.2 Read User Zone: $B2 7.6.2.1 Functional Figure 7-5. Read User Zone Command Functional Description The Read User Zone command $B2 allows reading of data from the device's currently selected user zone (the procedure for selecting a user zone is described below under Section 7.6.3.4 on page 31). The data byte address to be read is defined by Address 1 and Address 2 in the command and is internally incremented following the transmission of each data byte. The value N defines how many bytes CryptoMemory will read, a value of zero will result in 256 bytes read. The host how- ever may cease clocking the device and end the transmission with a NACK and STOP at anytime prior to receiving all N bytes. During a read operation the address will "roll over" from the last byte of the current zone, to the first byte of the same zone. If the host is not allowed to read the zone, the device will not acknowledge the N byte. Figure 7-6. Read User Zone Device Read Command Address 1 Address 2 Number of Bytes N Host N data bytes Data ... Data S T A R T S T O P Command Address 1 Address 2 Data Data x N A C K A C K A C K A C K A C K N A C K 1011 0010 xxxx xxxx xxxx xxxx xxxx xxxx d7--- ---d0 d7--- ---d0 N |
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