Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
795
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
If the SPI_RDR has not been read before new data is received, the Overrun Error (OVRES) bit in the SPI_SR is
set. As long as this flag is set, data is loaded in the SPI_RDR. The user has to read the status register to clear the
OVRES bit.
set. As long as this flag is set, data is loaded in the SPI_RDR. The user has to read the status register to clear the
OVRES bit.
, shows a block diagram of the SPI when operating in Master mode.
shows a
flow chart describing how transfers are handled.
35.7.3.1 Master Mode Block Diagram
Figure 35-5.
Master Mode Block Diagram
Shift Register
SPCK
MOSI
LSB
MSB
MISO
SPI_RDR
RD
SPI
Clock
TDRE
SPI_TDR
TD
RDRF
OVRES
SPI_CSRx
CPOL
NCPHA
BITS
Peripheral clock
Baud Rate Generator
SPI_CSRx
SCBR
NPCSx
NPCS0
NPCS0
0
1
PS
SPI_MR
PCS
SPI_TDR
PCS
MODF
Current
Peripheral
SPI_RDR
PCS
SPI_CSRx
CSAAT
PCSDEC
MODFDIS
MSTR