ATSAM4LS4BA-AU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATSAM4LS4BA-AU

ATSAM ARM-based Flash MCU

Atmel Corporation 

ATSAM4L8/L4/L2

The maximum SPI master output frequency is given by the following formula:

fSPCKMAX = MIN(fPINMAX,S----P-1---I--n--)

Where SPIn is the MOSI delay, SPI2 or SPI5 depending on CPOL and NCPHA. fPINMAX is the

maximum frequency of the SPI pins. refer to the I/O Pin Characteristics section for the maximum

frequency of the pins.

9.10.3.2

Maximum SPI Frequency, Master Input

The maximum SPI master input frequency is given by the following formula:

fSPCKMAX

=

-----------------1------------------

SPIn + tVALID

Where SPIn is the MISO setup and hold time, SPI0 + SPI1 or SPI3 + SPI4 depending on

CPOL and NCPHA. tVALID is the SPI slave response time. refer to the SPI slave datasheet for

tVALID .

Slave mode

Figure 9-14. SPI Slave Mode with (CPOL= 0 and NCPHA= 1) or (CPOL= 1 and NCPHA= 0)

SPCK

MISO

SPI6

MOSI

SPI7

SPI8

Figure 9-15. SPI Slave Mode with (CPOL= NCPHA= 0) or (CPOL= NCPHA= 1)

SPCK

MISO

SPI9

MOSI

SPI10

SPI11

42023GS–SAM–03/2014

147

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