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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD7294 датащи(PDF) 33 Page - Analog Devices |
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AD7294 датащи(HTML) 33 Page - Analog Devices |
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33 / 45 page  Preliminary Technical Data AD7294 Reading Data from an 8-Bit Register Reading the contents from any of the 8-bit registers is a single- byte read operation, as shown in Figure 30. This protocol assumes that the particular register address has been set up by a single-byte write operation to the address pointer register (see Figure 30). Once the register address has been set up, any number of reads can be performed from that particular register without having to write to the address pointer register again. If a read from a different address is required, the relevant register address has to be written to the address pointer register, and again any number of reads from this register can then be performed. In this operation, the master device receives a single byte from a slave device as follows: 1. The master device asserts a start condition on SDA. 2. The master sends the 7-bit slave address followed by the read bit (high). 3. The addressed slave device asserts ACK on SDA. 4. The master receives a data byte. 5. The master asserts NACK on SDA so that the slave knows the data transfer is complete. 6. The master asserts a stop condition on SDA, and the transaction ends. SDA 11 99 D7 D6 D5 D2 D1 D0 R/W A0 A1 A2 A3 A4 1 SC L D4 D3 1 START BY MASTER ACK. BY AD7294 NO ACK. BY MASTER STOP BY MASTER FRAME 1 SERIAL BUS ADDRESS BYT E FRAME 2 SINGLE DATA BYT E FROM AD7294 Figure 30. Reading a Single Byte of Data from a Selected Register Rev. PrB | Page 33 of 45 |
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