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1745D–ATARM–04-Nov-05
AT91M55800A
Figure 20-1. Functional Flow Diagram in Master Mode
SPI Enable
TDRE
PS
1
0
0
1
1
1
0
Same Peripheral
New Peripheral
NPCS = SP_TDR(PCS) NPCS = SP_MR(PCS)
Delay DLYBS
Serializer = SP_TDR(TD)
TDRE = 1
Data Transfer
SP_RDR(RD) = Serializer
RDRF = 1
TDRE
PS
NPCS = 0xF
Delay DLYBCS
SP_TDR(PCS)
NPCS = 0xF
Delay DLYBCS
NPCS = SP_TDR(PCS)
Fixed Peripheral
Variable Peripheral
Fixed Peripheral
Variable Peripheral
Delay DLYBCT
0