LPS331AP

Digital interfaces

Doc ID 022112 Rev 7

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5.3.3

SPI read in 3-wires mode

A 3-wires mode is entered by setting to ‘1’ bit SIM (SPI serial interface mode selection) in

CTRL_REG4.

Figure 9.

SPI read protocol in 3-wires mode

The SPI read command is performed with 16 clock pulses:

bit 0: READ bit. The value is 1.

bit 1: MS bit. When 0, do not increment the address, when 1, increment the address in

multiple readings.

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).

Multiple read command is also available in 3-wires mode.

CS

SPC

SDI/O

RW

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

AD5 AD4 AD3 AD2 AD1 AD0

MS