Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Fiche De Données

797

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

 shows the behavior of Transmit Data Register Empty (TDRE), Receive Data Register (RDRF) and

Transmission Register Empty (TXEMPTY) status flags within the SPI_SR during an 8-bit data transfer in Fixed
mode without the PDC or DMA involved.

6

SPCK

MOSI

(from master)

MISO

(from slave)

NPCS0

MSB

MSB

LSB

LSB

6

6

5

5

4

4

3

3

2

2

1

1

1

2

3

4

5

7

8

6

RDRF

TDRE

TXEMPTY

Write in

SPI_TDR

RDR read

shift register empty