H3LIS331DL Datasheet, PDF (21/38 Pages) STMicroelectronics – MEMS motion sensor: low-power high-g 3-axis digital accelerometer

H3LIS331DL
Digital interfaces
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: 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
MS AD5 AD4 AD3 AD2 AD1 AD0
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0 DO15DO14DO13DO12DO11DO10DO9 DO8
5.2.2
SPI write
CS
SPC
SDI
Figure 9. SPI write protocol
RW
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
MS AD5 AD4 AD3 AD2 AD1 AD0
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 the address. When 1, increments the 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 inside the device (MSB
first).
bit 16-...: data DI(...-8). Further data in multiple byte writes.
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