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AS5047U-HTST датащи(PDF) 22 Page - ams AG |
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AS5047U-HTST датащи(HTML) 22 Page - ams AG |
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22 / 51 page ![]() Page 22 ams Datasheet Document Feedback [v1-00] 2018-Oct-30 AS5047U − Detailed Description Figure 30: SPI Write PAD Word Any number of PAD [8*n-1:0] bits can precede the MOSI data. The PAD word is used to allocate the data on MISO to the correct device. CRC Checksum For secure and reliable data transmission, the 24-Bit and 32-Bit frames have a CRC for verification of correct transmission. The CRC is calculated out of the payload of SPI frames (e.g.: CRC is calculated out of bit 23:8 from 24-bit command frame) The calculation of the CRC is based on Irreducible polynomial x^8+x^4+x^3+x^2+1 according to standard J1850. The initialization CRC = 0xFF prevents that 0x000000 is a valid SPI command. This command would clear all sticky error flags. Write ADD[n] DATA (x) CSn Write ADD[m] DATA (ADD[n]) DATA (ADD[m]) DATA (x) Comm and Comm and Data to write into A DD[n] Data content ADD[n] Data content ADD[m] New Data content of ADD[n] MOSI MISO DATA (y) Data to write into A DD[m] Next command Comm and DATA (y) New Data content of ADD[m] |
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