L3GD20 查看數據表（PDF） - STMicroelectronics

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L3GD20

MEMS motion sensor: three-axis digital output gyroscope

STMicroelectronics 

Digital interfaces

L3GD20

5.2.1

SPI read

Figure 13. SPI read protocol

CS

SPC

SDI

RW

MS AD5 AD4 AD3 AD2 AD1 AD0

SDO

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

AM10130V1

The SPI read command is performed with 16 clock pulses. The multiple byte read command

is performed by adding blocks of 8 clock pulses to the previous one.

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).

bit 16-... : data DO(...-8). Further data in multiple byte reading.

Figure 14. Multiple byte SPI read protocol (2-byte example)

CS

SP C

SDI

SD O

RW

M S A D5 A D4 AD 3 A D2 A D1 A D0

DO 7 DO 6 DO 5 DO 4 DO 3 DO 2 DO 1 DO 0 DO 15 DO 14 DO 13 DO 12 DO 11 DO 10 D O9 D O8

AM10131V1

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Doc ID 022116 Rev 1

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