LIS331DL Просмотр технического описания (PDF) - STMicroelectronics

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LIS331DL

MEMS motion sensor 3-axis - ±2g/±8g smart digital output “nano” accelerometer

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LIS331DL

Digital interfaces

5.2.3

SPI read in 3-wires mode

3-wires mode is entered by setting to 1 bit SIM (SPI Serial Interface Mode selection) in

CTRL_REG2.

Figure 11. SPI read protocol in 3-wires 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 do not increment address, when 1 increment address in multiple

reading.

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).

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

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