Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet

SAM4E [DATASHEET]

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

856

Name: TWI_SR

0x400A8020 (0), 0x400AC020 (1)

Access: Read-only

0x0000F009



TXCOMP used in Master mode: 

0: During the length of the current frame.

1: When both holding register and internal shifter are empty and STOP condition has been sent.

TXCOMP behavior in Master mode can be seen in 

 and in 

TXCOMP used in Slave mode:

0: As soon as a Start is detected.

1: After a Stop or a Repeated Start + an address different from SADR is detected.

TXCOMP behavior in Slave mode can be seen in 

 and 



0: No character has been received since the last TWI_RHR read operation.

1: A byte has been received in the TWI_RHR since the last read.

RXRDY behavior in Master mode can be seen in 

.

RXRDY behavior in Slave mode can be seen in 

 and 



TXRDY used in Master mode:

0: The transmit holding register has not been transferred into internal shifter. Set to 0 when writing into TWI_THR.

1: As soon as a data byte is transferred from TWI_THR to internal shifter or if a NACK error is detected, TXRDY is set at 
the same time as TXCOMP and NACK. TXRDY is also set when MSEN is set (enable TWI).

TXRDY behavior in Master mode can be seen in 

.

TXRDY used in Slave mode:

0: As soon as data is written in the TWI_THR, until this data has been transmitted and acknowledged (ACK or NACK).

31

30

29

28

27

26

25

24

–

–

–

–

–

–

–

–

23

22

21

20

19

18

17

16

–

–

–

–

–

–

–

–

15

14

13

12

11

10

9

8

TXBUFE

RXBUFF

ENDTX

ENDRX

EOSACC

SCLWS

ARBLST

NACK

7

6

5

4

3

2

1

0

–

OVRE

GACC

SVACC

SVREAD

TXRDY

RXRDY

TXCOMP