Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

638

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

Name: SPI_SR

0xF0000010 (0), 0xF0004010 (1)

Read-only  

0 = No data has been received since the last read of SPI_RDR

1 = Data has been received and the received data has been transferred from the serializer to SPI_RDR since the last read of 
SPI_RDR.

0 = Data has been written to SPI_TDR and not yet transferred to the serializer.

1 = The last data written in the Transmit Data Register has been transferred to the serializer. 

TDRE equals zero when the SPI is disabled or at reset. The SPI enable command sets this bit to one.

0 = No Mode Fault has been detected since the last read of SPI_SR.

1 = A Mode Fault occurred since the last read of the SPI_SR.

0 = No overrun has been detected since the last read of SPI_SR.

1 = An overrun has occurred since the last read of SPI_SR.

An overrun occurs when SPI_RDR is loaded at least twice from the serializer since the last read of the SPI_RDR.

0 = No rising edge detected on NSS pin since last read.

1 = A rising edge occurred on NSS pin since last read.

0 = As soon as data is written in SPI_TDR.

1 = SPI_TDR and internal shifter are empty. If a transfer delay has been defined, TXEMPTY is set after the completion of such 
delay.

0 = SPI is disabled.

1 = SPI is enabled.

31

30

29

28

27

26

25

24

–

–

–

–

–

–

–

–

23

22

21

20

19

18

17

16

–

–

–

–

–

–

–

SPIENS

15

14

13

12

11

10

9

8

–

–

–

–

–

–

TXEMPTY

NSSR

7

6

5

4

3

2

1

0

–

–

–

–

OVRES

MODF

TDRE

RDRF