H3LIS331DL Datasheet, PDF (22/38 Pages) STMicroelectronics – MEMS motion sensor: low-power high-g 3-axis digital accelerometer

Digital interfaces
H3LIS331DL
Figure 10. Multiple byte SPI write protocol (2-byte example)
CS
SPC
SDI
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8
RW
MS AD5 AD4 AD3 AD2 AD1 AD0
5.2.3
SPI read in 3-wire mode
3-wire mode is entered by setting bit SIM (SPI serial interface mode selection) to ‘1’ in
CTRL_REG4.
Figure 11. SPI read protocol in 3-wire mode
CS
SPC
SDI/O
RW
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0
MS AD5 AD4 AD3 AD2 AD1 AD0
The SPI read command is performed with 16 clock pulses:
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).
The multiple read command is also available in 3-wire mode.
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