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NRF52820-QDAA-R Datasheet(PDF) 245 Page - Nordic Semiconductor

Part # NRF52820-QDAA-R
Description  nRF52820
PDF  437 Pages
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Manufacturer  NORDIC [Nordic Semiconductor]
Direct Link  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF52820-QDAA-R Datasheet(HTML) 245 Page - Nordic Semiconductor

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Peripherals
same time as the first byte is being extracted from RXD by the CPU. The SPI master will generate a READY
event every time a new byte is moved to the RXD register. The double buffered byte will be moved from
RXD-1 to RXD as soon as the first byte is extracted from RXD. The SPI master will stop when there are no
more bytes to send in TXD and TXD+1.
0
1
2
n-2
n-1
n
A
B
C
m-2
m-1
m
CSN
MOSI
MISO
CPU
SCK
1
3
4
5
6
7
2
Figure 96: SPI master transaction
The READY event of the third byte transaction is delayed until B is extracted from RXD in occurrence
number 3 on the horizontal lifeline. The reason for this is that the third event is generated first when C is
moved from RXD-1 to RXD after B is read.
The SPI master will move the incoming byte to the RXD register after a short delay following the SCK clock
period of the last bit in the byte. This also means that the READY event will be delayed accordingly, see SPI
master transaction on page 246. Therefore, it is important that you always clear the READY event, even
if the RXD register and the data that is being received is not used.
4463_156 v1.0
245



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