AS3909 datasheet(26/77 Pages) AMSCO

26 / 77 page

AS3909/AS3910 – 26

ams Datasheet, Confidential: 2013-Oct [3-02]

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

Figure 17:

Sending Direct Commands

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. The command mode

code 10 indicates 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 32 bytes), can be

transferred. In case the command is terminated by putting SEN

low before a packet of 8 bits composing one byte is sent, writing

of that particular byte in FIFO is not performed. Figure 18 shows

how to load the Transmitting Data into the FIFO.

Figure 18:

Loading Transmitting Data into FIFO

SEN falling edge

signals start of

command execution

SCLK

falling edge

Data is sampled

SCLK raising

edge data is

transferred from

µC

Two leading

ONE indicate

COMMAND

Mode

SDATAI

SCLK

SEN

1 to 32

bytes

SEN falling

edge signals

end of

COMMAND

Mode

Start of

payload

Data

SCLK

falling edge

Data is sampled

SCLK raising

edge data is

transferred from

µC

10 pattern

indicates

FIFO mode

SDATAI

SCLK

SEN

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