Datasheet

DocID023312 Rev 2 25/52
LSM303D Digital interfaces
52
6.2.1 SPI read
Figure 7. SPI read protocol
The SPI read command is performed with 16 clock pulses. The 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: MS bit. When 0, does not increment the address; when 1, increments the address in
multiple reads.
bit 2-7: address AD(5:0). 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).
bit 16-... : data DO(...-8). Further data in multiple byte reads.
Figure 8. Multiple byte SPI read protocol (2-byte example)
CS
SPC
SDI
SDO
RW
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0
AD5 AD4 AD3 AD2 AD1 AD0
MS
AM10130V1
CS
SP C
SDI
SD O
RW
DO7DO6DO5DO4DO3DO2 DO1DO0
AD5 AD4 AD 3 AD2 AD1 AD0
DO 15 DO 14 DO 13 DO 12 DO 11 DO 10 D O9 D O8
MS
AM10131V1