Datasheet

147
42023GS–SAM–03/2014
ATSAM4L8/L4/L2
The maximum SPI master output frequency is given by the following formula:
Where is the MOSI delay, SPI2 or SPI5 depending on CPOL and NCPHA. is the
maximum frequency of the SPI pins. refer to the I/O Pin Characteristics section for the maximum
frequency of the pins.
Maximum SPI Frequency, Master Input
The maximum SPI master input frequency is given by the following formula:
Where is the MISO setup and hold time, SPI0 + SPI1 or SPI3 + SPI4 depending on
CPOL and NCPHA. is the SPI slave response time. refer to the SPI slave datasheet for
.
9.10.3.2 Slave mode
Figure 9-14. SPI Slave Mode with (CPOL= 0 and NCPHA= 1) or (CPOL= 1 and NCPHA= 0)
Figure 9-15. SPI Slave Mode with (CPOL= NCPHA= 0) or (CPOL= NCPHA= 1)
f
SPCKMAX
MIN f
PINMAX
1
SPIn
------------(,)=
SPIn
f
PINMAX
f
SPCKMAX
1
SPIn t
VALID
+
----------------------------------- -=
SPIn
t
VALID
t
VALID
SPI7 SPI8
MISO
SPCK
MOSI
SPI6
SPI10 SPI11
MISO
SPCK
MOSI
SPI9