A3G4250D datasheet(27/44 Pages) STMICROELECTRONICS

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A3G4250D

Digital interfaces

Doc 022768 Rev 3

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The SPI read command is performed with 16 clock pulses. A 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 is 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)

5.2.2

SPI write

Figure 15.

SPI write protocol

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

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

Bit 0: WRITE bit. The value is 0.

Bit 1: MS bit. When 0, do not increment address; when 1, increment address in multiple

writing.

Bit 2 -7: address AD(5:0). This is the address field of the indexed register.

Bit 8-15: data DI(7:0) (write mode). This is the data that is written to the device (MSb first).

Bit 16-...: data DI(...-8). Further data in multiple byte writing.

SPC

SDI

SDO

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

AD5 AD4 AD3 AD2 AD1 AD0

DO15DO14DO13DO12DO11DO10DO9 DO8

SPC

SDI

DI7

DI6

DI5

DI4

DI3

DI2

DI1

DI0

AD5 AD4 AD3 AD2 AD1 AD0

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