L3G4200D 데이터 시트보기 (PDF) - STMicroelectronics

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L3G4200D

MEMS motion sensor: three-axis digital output gyroscope

STMicroelectronics 

L3G4200D

Digital interfaces

5.2.1

SPI read

Figure 8. SPI read protocol

CS

SPC

SDI

SDO

RW

MS AD5 AD4 AD3 AD2 AD1 AD0

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

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

performed adding blocks of 8 clock pulses at 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 9. Multiple bytes SPI read protocol (2 bytes example)

CS

SPC

SDI

SDO

RW

MS AD5 AD4 AD3 AD2 AD1 AD0

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0 DO15DO14DO13DO12DO11DO10DO9 DO8

5.2.2

SPI write

Figure 10. SPI write protocol

CS

SPC

SDI

RW

DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0

MS AD5 AD4 AD3 AD2 AD1 AD0

Doc ID 17116 Rev 1

19/24

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