SAM4L Datasheet, PDF (663/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
Figure 26-5 on page 663shows a block diagram of the SPI when operating in master mode. Fig-
ure 26-6 on page 664 shows a flow chart describing how transfers are handled.
26.7.3.1 Master Mode Block Diagram
Figure 26-5. Master Mode Block Diagram
CSR0..3
SCBR
CLK_SPI
Baud Rate Generator
SPCK
MISO
SPI
Clock
CSR0..3
BITS
NCPHA
CPOL
RXFIFOEN
0
1
RDR
RD
4 – Character FIFO
LSB
Shift Register
MSB
MOSI
RDRF
OVRES
TDR
TD
TDRE
RXFIFOEN
MR
TDR
PCS
PCS
PS
0
CSR0..3
CSNAAT
0
CSAAT
1
PCSDEC
Current
Peripheral
1
RDR
4 – Character FIFO
NPCS3
NPCS2
NPCS1
NPCS0
NPCS0
MSTR
MODFDIS
MODF
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