SAM4L Datasheet, PDF (664/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
26.7.3.2 Master Mode Flow Diagram
Figure 26-6. Master Mode Flow Diagram
SPI Enable
1
TDRE ?
0
1
CSAAT ?
0
0
PS ?
Variable
1
peripheral
NPCS = TDR(PCS)
Fixed
peripheral
NPCS = MR(PCS)
Delay DLYBS
Serializer = TDR(TD)
TDRE = 1
Data Transfer
RDR(RD) = Serializer
RDRF = 1
Delay DLYBCT
0
TDRE ?
1
1
CSAAT ?
0
NPCS = 0xF
Delay DLYBCS
- NPCS defines the current Chip Select
- 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.
PS ?
Fixed
0 _peripheral
Variable
1 _peripheral
yes
TDR(PCS)
MR(PCS)
= NPCS ?
= NPCS ?
no
NPCS = 0xF
no
NPCS = 0xF
Delay DLYBCS
NPCS = TDR(PCS)
Delay DLYBCS
NPCS = MR(PCS),
TDR(PCS)
42023C–SAM–02/2013
664