LSM6DS3US Datasheet, PDF (40/104 Pages) STMicroelectronics – iNEMO inertial module: always-on 3D accelerometer and 3D gyroscope

Digital interfaces
LSM6DS3US
6.2.3
SPI read in 3-wire mode
A 3-wire mode is entered by setting the CTRL3_C (12h) (SIM) bit equal to ‘1’ (SPI serial
interface mode selection).
Figure 14. SPI read protocol in 3-wire mode
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The SPI read command is performed with 16 clock pulses:
bit 0: READ bit. The value is 1.
bit 1-7: address AD(6:0). This is the address field of the indexed register.
bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first).
A multiple read command is also available in 3-wire mode.
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