LSM303AH Datasheet, PDF (47/82 Pages) –

LSM303AH
Digital interfaces
Figure 19. Magnetometer multiple byte SPI write protocol (2-byte example)
CS
SPC
SDI
RW
DI7 D I6 DI5 D I4 DI3 DI2 DI1 DI0 DI15 D I1 4 DI13 D I1 2 DI11 DI10 DI9 DI8
AD6 AD5 AD4 AD3 AD2 AD1 AD 0
6.2.4
Magnetometer SPI read in 3-wire mode
Figure 20. Magnetometer SPI read protocol in 3-wire mode
CS
SPC
SDI/O
RW
D O7 D O6 D O5 DO4 DO3 DO2 DO1 DO0
AD6 AD5 AD 4 AD 3 AD2 AD1 AD 0
The SPI read command is performed with 16 clock pulses:
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 DO(7:0) (read mode). This is the data that is read from the device (MSb first).
The multiple read command is available in 3-wire mode.
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