RDATA
Receive Data
In 8-bits SPI bus width, this register can be accessed in byte,
half-word or word unit by AHB. In byte accessing method, if
there are words in RXFIFO, the top word is returned and the
RXFIFO depth is decreased by 1. In half-word accessing
method, the two SPI bursts are returned and the RXFIFO
depth is decrease by 2. In word accessing method, the four
SPI bursts are returned and the RXFIFO depth is decreased
by 4.
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