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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADATE305 датащи(PDF) 37 Page - Analog Devices |
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ADATE305 датащи(HTML) 37 Page - Analog Devices |
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37 / 56 page  ADATE305 Rev. 0 | Page 37 of 56 READ OPERATION The read operation is a two-stage operation. First, a word is shifted in, specifying which register to read. CS is deasserted for three clock cycles, and then a second word is shifted in to obtain the readback data. This second word can be either another operation or an NOP address. If another operation is shifted in, it needs to shift in at least eight bits of data to read back the previous specified data. The NOP address can be used for this read if there is no need to write/read another register. To maintain the clarity of the operation, it is strongly recommended that the NOP address be used for all reads. Any register read that is fewer than 16 bits has zeroes filled in the top bits to make it a 16-bit word. X X READ INSTRUCTION NOP XREAD DATA X SCLK INPUT SDIN INPUT SDOUT OUTPUT CS INPUT NOTES 1. X = DON’T CARE. Figure 75. SPI Read Overview X DATA[15:0], VALUE IS A DON’T CARE 0 25 24 23 22 21 20 19 18 17 16 15 14 13 12 CH[1] X R/W CH[0] ADDR[4] ADDR[3] ADDR[2] ADDR[1] ADDR[0] SCLK INPUT SDIN INPUT SDOUT OUTPUT CS INPUT NOTES 1. X = DON’T CARE. Figure 76. SPI Read—Details of Read Request X DATA[15:0], VALUE IS A DON’T CARE 0 25 24 23 22 21 20 19 18 17 16 15 14 13 12 CH[1] RDATA[15] RDATA[2] RDATA[1] RDATA[0] RDATA[14] X R/W = 1 ADDR[4:0] = 0x00 (NOP) CH[0] SCLK INPUT SDIN INPUT SDOUT OUTPUT CS INPUT NOTES 1. RDATA IS THE REGISTER VALUE BEING READ. 2. X = DON’T CARE. Figure 77. SPI Read—Details of Read Out |
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