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[v1-05] 2019-Feb-15

AS3953A − Detailed Description

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. The command

mode code 10 indicates 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 read.

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.

Figure 48:

Sending of a Direct Command

SCLK rising

edge Data is

transfered from

µC

SCLK falling

edge Data is

sampled

/SS rising edge signals

start of command

execution

Two leading

ONE indicate

COMMAND

Mode

/SS

SCLK

MOSI

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