LIS3DETR datasheet(26/46 Pages) STMICROELECTRONICS

Part #	LIS3DETR

Description	ultra-low-power high-performance 3-axis "nano" accelerometer

PDF	46 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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26 / 46 page

Digital interfaces

LIS3DE

26/46

DocID023719 Rev 3

Figure 10. Multiple byte SPI write protocol (2-byte example)

6.2.3

SPI read in 3-wire mode

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

CTRL_REG4.

Figure 11. SPI read protocol in 3-wire 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, 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.

SPC

SDI

AD5 AD4 AD3 AD2 AD1 AD0

DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8

SPC

SDI/O

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

AD5 AD4 AD3 AD2 AD1 AD0

LIS3DETR Datasheet(PDF) 26 Page - STMicroelectronics