LSM330 Datasheet, PDF (38/75 Pages) STMicroelectronics – Power-down and sleep modes

Digital interfaces
LSM330
6.2.3
SPI read in 3-wire mode
3-wire mode is entered by setting the SIM bits to ‘1’ (SPI serial interface mode selection) in
the CTRL_REG6_A (24h) and CTRL_REG4_G (23h).
Figure 20. SPI read protocol in 3-wire mode
Note:
CS
SPC
SDI/O
RW
D O7 D O6 D O5 DO4 DO3 DO2 DO1 DO0
MS AD5 AD 4 AD 3 AD2 AD1 AD 0
AM10134V1
Data on CS, SPC, SDI and SDO refer to pins: CS_A, CS_G, SCL_A/G, SDA_A/G, SDO_A /
SDO_G.
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 will be read from the device (MSb
first).
A multiple read command is also available in 3-wire mode.
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