Rainbow Electronics AT75C220 - Manual (Page 123)

AT75C220
123
Figure 28. 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