AS3911 datasheet(42/159 Pages) AMSCO

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[v2-11] 2016-Jun-13

AS3911 − Application Information

Reading of Data from Addressable Registers (Read

Mode)

After the SPI operation mode bits the address of register to be

read has to be provided from the MSB to the LSB. Then one or

more data bytes are transferred to MISO output, always from

the MSB to the LSB. As in case of the write mode also the read

mode supports auto-incrementing address.

MOSI is sampled at the falling edge of SCLK (like shown in the

following diagrams), data to be read from the AS3911 internal

sampled by the master at the falling edge of SCLK.

In case the register on defined address does not exist all 0 data

is sent to MISO.

Figure 28 provides an example for reading of single byte.

Figure 28:

SPI Communication: Reading of Single Byte

SC L K rising

edge D a ta is

move d fro m

A d dre ss

<A5-A0>

/S S risin g e dg e

signals end of R E A D

Mod e

T w o le ad ing

bits ind icate

Mo de

trista te

SC L K rising

ed ge D a ta is

tran sfered

from µ C

S C L K fa lling

ed ge D a ta is

sa m p led

S C L K fa lling ed ge

D a ta is tran sfe re d

to µ C

/S S

SC L K

MO S I

MIS O

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