Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Scheda Tecnica
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Codici prodotto
ATSAM4S-XPLD
604
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
32.7.3.2 Master Mode Flow Diagram
Figure 32-6. Master Mode Flow Diagram
SPI Enable
CSAAT
PS
1
0
0
1
1
NPCS = SPI_TDR(PCS)
NPCS = SPI_MR(PCS)
Delay DLYBS
Serializer = SPI_TDR(TD)
TDRE = 1
Data Transfer
SPI_RDR(RD) = Serializer
RDRF = 1
TDRE
NPCS = 0xF
Delay DLYBCS
Fixed
peripheral
Variable
peripheral
Delay DLYBCT
0
1
CSAAT
0
TDRE
1
0
PS
0
1
SPI_TDR(PCS)
= NPCS
no
yes
SPI_MR(PCS)
= NPCS
no
NPCS = 0xF
Delay DLYBCS
NPCS = SPI_TDR(PCS)
NPCS = 0xF
Delay DLYBCS
NPCS = SPI_MR(PCS),
SPI_TDR(PCS)
Fixed
peripheral
Variable
peripheral
- NPCS defines the current Chip Select
- CSAAT, DLYBS, DLYBCT refer to the fields of the
- CSAAT, DLYBS, DLYBCT refer to the fields of the
Chip Select Register corresponding to the Current Chip Select
- When NPCS is 0xF, CSAAT is 0.