Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

 663

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

Name: TWI_SR

0x40018020 (0), 0x4001C020 (1)

Access: Read-only

0x0000F009

TXCOMP used in Master mode: 

0 = During the length of the current frame.

1 = When both holding and shifter registers are empty and STOP condition has been sent.

TXCOMP behavior in Master mode can be seen 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 

.

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 

TXRDY used in Master mode:

0 = The transmit holding register has not been transferred into shift register. Set to 0 when writing into TWI_THR register.

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 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).

1 = It indicates that the TWI_THR is empty and that data has been transmitted and acknowledged. 

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