AS3956 datasheet(64/107 Pages) AMSCO

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[v1-11] 2018-Nov-14

AS3956 − Detailed Description

Loading Transmission Data into Buffer

Loading the transmitting data into the buffer is similar to

writing data into an addressable registers. Difference is that in

case of loading more bytes all bytes go to the buffer. The

command mode code 100b indicates buffer write operation. A

bit stream of 32 bytes of data can be transferred. The following

figure shows how to load the transmission data into the buffer.

Figure 62:

Loading Data into Buffer over SPI

Reading Received Data from Buffer

Reading received data from the buffer is similar to reading data

from an addressable registers. Difference is that, in case of

reading more bytes, they all come from the buffer. The

command mode code 101b indicates buffer operations. 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.

/SS

SCLK

MOSI

1 to 32

bytes

SCLK rising

edge Data is

transfered

from µC

SCLK falling

edge Data is

sampled

/SS rising edge

signals end of

COMMAND Mode

10 pattern

indicates

FIFO mode

Start of

payload Data

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