LSM6DSM Datasheet, PDF (42/113 Pages) STMicroelectronics – always-on 3D accelerometer and 3D gyroscope

Digital interfaces
6.5.2 SPI write
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Figure 14. SPI write protocol
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The SPI Write command is performed with 16 clock pulses. A multiple byte write command
is performed by adding blocks of 8 clock pulses to the previous one.
bit 0: WRITE bit. The value is 0.
bit 1 -7: address AD(6:0). This is the address field of the indexed register.
bit 8-15: data DI(7:0) (write mode). This is the data that is written inside the device (MSb
first).
bit 16-... : data DI(...-8). Further data in multiple byte writes.
Figure 15. Multiple byte SPI write protocol (2-byte example)
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