LSM303D Datasheet, PDF (26/52 Pages) STMicroelectronics – Embedded temperature sensor

Digital interfaces
6.2.2 SPI write
Figure 9. SPI write protocol
LSM303D
CS
SPC
SDI
RW
D I7 D I6 D I5 D I4 DI3 DI2 DI1 DI0
MS AD5 AD 4 AD 3 AD2 AD 1 AD0
AM10132V1
The SPI write command is performed with 16 clock pulses. The 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, do not increment address; when 1, increment address in multiple
writing.
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 10. Multiple byte SPI write protocol (2-byte example)
6.2.3
CS
SPC
SDI
DI7 D I6 DI5 D I4 DI3 DI2 DI1 DI0 DI15 D I1 4DI13 D I1 2DI11 DI10 DI9 DI8
RW
MS _{AD5 AD4 AD3 AD2 AD1 AD 0}
AM10133V1
SPI read in 3-wire mode
3-wire mode is entered by setting the bit SIM (SPI serial interface mode selection) to ‘1’ in
CTRL2 (21h).
26/52
DocID023312 Rev 2