LSM6DS33 Datasheet, PDF (31/77 Pages) STMicroelectronics – iNEMO inertial module: always-on 3D accelerometer and 3D gyroscope

LSM6DS33
Digital interfaces
6.2.1
Both the read register and write register commands are completed in 16 clock pulses or in
multiples of 8 in case of multiple read/write bytes. Bit duration is the time between two falling
edges of SPC. The first bit (bit 0) starts at the first falling edge of SPC after the falling edge
of CS while the last bit (bit 15, bit 23, ...) starts at the last falling edge of SPC just before the
rising edge of CS.
bit 0: RW bit. When 0, the data DI(7:0) is written into the device. When 1, the data DO(7:0)
from the device is read. In latter case, the chip will drive SDO at the start of bit 8.
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 into the device (MSb first).
bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first).
In multiple read/write commands further blocks of 8 clock periods will be added. When the
CTRL3_C (12h) (IF_INC) bit is ‘0’, the address used to read/write data remains the same for
every block. When the CTRL3_C (12h) (IF_INC) bit is ‘1’, the address used to read/write
data is increased at every block.
The function and the behavior of SDI and SDO remain unchanged.
SPI read
Figure 8. SPI read protocol
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The SPI Read command is performed with 16 clock pulses. A multiple byte read command
is performed by adding blocks of 8 clock pulses to the previous one.
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 will be read from the device (MSb
first).
bit 16-...: data DO(...-8). Further data in multiple byte reads.
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