AN2335 datasheet(14/40 Pages) STMICROELECTRONICS

Part #	AN2335

Description	This document is intended to give application

PDF	40 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Digital interfaces

AN2335

14/40

4.2.2

SPI read

Figure 5.

SPI read protocol

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

performed adding blocks of 8 clocks 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 6.

Multiple bytes SPI read protocol (2 bytes example)

4.2.3

SPI Write

Figure 7.

SPI Write Protocol

SPC

SDI

SDO

DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

AD5 AD4 AD3 AD2 AD1 AD0

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

AN2335 Datasheet(PDF) 14 Page - STMicroelectronics