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1745D–ATARM–04-Nov-05
AT91M55800A
20.3 Slave Mode
In Slave Mode, the SPI waits for NSS to go active low before receiving the serial clock from an
external master.
In slave mode CPOL, NCPHA and BITS fields of SP_CSR0 are used to define the transfer
characteristics. The other Chip Select Registers are not used in slave mode.
Figure 3. SPI in Slave Mode
S
R
Q
T
D
R
E
R
D
R
F
O
V
R
E
S
P
I
E
N
S
Serializer
SCK
SPIDIS SPIEN
SP_IER
SP_IDR
SP_IMR
SP_SR
MISO
LSB MSB
NSS
MOSI
SPIRQ
SP_RDR
RD
SP_TDR
TD