I3G4250D Datasheet, PDF (26/43 Pages) STMicroelectronics – 3-axis digital output gyroscope

Digital interfaces
5.2.2 SPI write
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Figure 15. 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: MS bit. When 0, does not increment address; when 1, increments address in multiple
writes.
Bit 2 -7: address AD(5:0). 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 to the device (MSb first).
Bit 16-...: data DI(...-8). Further data in multiple byte writes.
Figure 16. Multiple byte SPI write protocol (2-byte example)
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DocID027628 Rev 2