AS3911 datasheet(41/149 Pages) AMSCO

41 / 149 page

ams Datasheet, Confidential: 2013-Oct [2-03]

AS3911 – 41

Appl icatio n I n f o rm a t i o n

Figure 25:

SPI Communication: Reading of Single Byte

Loading Transmitting Data into FIFO

Loading the transmitting data into the FIFO is similar to writing

data into an addressable registers. Difference is that in case of

loading more bytes all bytes go to the FIFO. SPI operation mode

bits 10 indicate FIFO operations. In case of loading transmitting

data into FIFO all bits <C5 – C0> are set to 0. Then a bit-stream,

the data to be sent (1 to 96 bytes), can be transferred. In case

the command is terminated by putting /SS high before a packet

of 8 bits composing one byte is sent, writing of that particular

byte in FIFO is not performed.

Figure 26 shows how to load the Transmitting Data into the

FIFO.

Figure 26:

SPI Communication: Loading of FIFO

SC LK risin g

ed ge D a ta is

mo ved from

A ddress

/S S risin g e dg e

signals end of R E A D

Mod e

T w o lea din g

bits ind ica te

Mo de

trista te

SC L K rising

edge D ata is

tran sfered

from µ C

S C L K fa lling

edge D ata is

sa m ple d

S C LK fallin g ed ge

D ata is tran sfe re d

to µ C

/S S

SC L K

MO S I

MIS O

1 to 32

bytes

SCLK rising

edge Data is

transfered

from µC

SCLK falling

edge Data is

sampled

10 pattern

indicates

FIFO mode

Start of payload

Data

/SS

SCLK

MOSI

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