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数据搜索系统，热门电子元器件搜索 |
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ILPS22QSTR 数据表(PDF) 27 Page - STMicroelectronics |
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ILPS22QSTR 数据表(HTML) 27 Page - STMicroelectronics |
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27 / 57 page  7.3 SPI bus interface (CS = low) The ILPS22QS SPI is a bus slave. The SPI allows writing to and reading from the registers of the device. The serial interface interacts with the application using only the 3-wire SPI which is available with CS, SPC, SDI/SDO. Figure 17. SPI read protocol The SPI read command is performed with 16 clock pulses. The multiple byte read command is performed by adding blocks of 8 clock pulses to the previous one. bit0:READ bit. The value is 1. bit1-7:address AD(6:0). This is the address field of the indexed register. bit8-15:data DO(7:0) (read mode). This is the data that is read from the device (MSb first). bit16-...:data DO(...-8). Further data in multiple byte reads. Figure 18. Multiple byte SPI read protocol (2-byte example) ILPS22QS SPI bus interface (CS = low) DS13431 - Rev 3 page 27/57 |
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