L3G4200D

Digital interfaces

Doc ID 17116 Rev 1

19/24

5.2.1

SPI read

Figure 8.

SPI read protocol

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)

5.2.2

SPI write

Figure 10.

SPI write protocol

CS

SPC

SDI

SDO

RW

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

AD5 AD4 AD3 AD2 AD1 AD0

MS

CS

SPC

SDI

SDO

RW

DO7DO6 DO5DO4 DO3DO2 DO1DO0

AD5 AD4 AD3 AD2 AD1 AD0

DO15DO14DO13DO12DO11DO10DO9 DO8

MS

CS

SPC

SDI

RW

DI7

DI6

DI5

DI4

DI3

DI2

DI1

DI0

AD5 AD4 AD3 AD2 AD1 AD0

MS