AS3911 datasheet(42/149 Pages) AMSCO

42 / 149 page

AS3911 – 42

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

A p pl i c at io n I n f o r m at i o n

Reading Received Data from FIFO

Reading received data from the FIFO is similar to reading data

from an addressable registers. Difference is that in case of

reading more bytes they all come from the FIFO. SPI operation

mode bits 10 indicate FIFO operations. In case of reading the

received data from the FIFO all bits <C5 – C0> are set to 1. On

the following SCLK rising edges the data from FIFO appears as

in case of read data from addressable registers. In case the

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

8 bits composing one byte is read that particular byte is

considered unread and will be the first one read in next FIFO

read operation.

Figure 27:

SPI Communication: Reading of FIFO

Direct Command Mode

Direct Command Mode has no arguments, so a single byte is

sent. SPI operation mode bits 11 indicate Direct Command

Mode. The following six bits define command code, sent MSB

to the LSB. The command is executed on falling edge of last

clock.

While execution of some Direct Commands is immediate, there

are others which start a process of certain duration (calibration,

measurement…). During execution of such commands it is not

allowed to start another activity over the SPI interface. After

execution of such a command is terminated an IRQ is sent.

/S S

SC L K

MO S I

MIS O

1 to 32

bytes

tristate

trista te

SC L K risin g

edge D a ta is

transfe red

fro m µ C

S C LK fa lling

edge D a ta is

sa m p le d

10 patte rn

in d ica te s

FIFO m o d e

SC L K risin g

edge D a ta is

mo ve d fro m

FIFO

S C LK fa lling

edge D a ta is

tra n sfered to

µC

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