FXAS21002CQR1 データシートの表示（PDF） - Freescale Semiconductor

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FXAS21002CQR1

3-Axis Digital Angular Rate Gyroscope

Freescale Semiconductor 

Digital Interfaces

3.2.4 SPI Read Operations with 3-Wire Mode

NOTE

This description pertains only to the 3-wire SPI interface

mode (with CTRL_REG0[SPIW] = 1). This interface mode

is not the default and must be selected after a POR, or hard/

soft reset.

FXAS21002C can be configured to operate in 3-wire SPI mode. In this mode the

MISO pin is left unconnected or high-z, and the MOSI pin becomes a bi-directional

input/output pin (SPI_DATA). 3-wire mode is selected by setting the SPIW bit in

CTRL_REG0. Read operations in 3-wire mode are the same as in 4-wire mode

except that at the end of address cycle, the MOSI (SPI_DATA) pin automatically

switches from an input to an output.

SPI_CS_B

SCLK

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

SPI_DATA

R/W A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0

MISO

High-Impedance

Figure 14. SPI single byte read protocol diagram (3-wire mode)

SPI_CS_B

SCLK

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

MOSI

R/W A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

MISO

High-Impedance

Figure 15. SPI multiple byte read protocol diagram (3-wire mode)

3-Axis Digital Angular Rate Gyroscope, Rev. 2.1, 5/2015

21

Freescale Semiconductor, Inc.

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