at75c220 ATMEL Corporation, at75c220 Datasheet - Page 125

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

Slave Mode
In slave mode, the SPI waits for NPCSS to go active low
before receiving the serial clock from an external master.
Figure 30. SPI in Slave Mode
SPIDIS
SCK
NSS
MOSI
SPIEN
R
S
Q
LSB
SP_RDR
SP_TDR
Serializer
RD
TD
MSB
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.
SP_IDR
SP_IMR
SP_IER
SP_SR
S
P
E
N
S
I
D
R
E
T
R
D
R
F
O
R
V
E
SPIRQ
MISO
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