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

SAM4E [DATASHEET]

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

850

TWI_CR

0x400A8000 (0), 0x400AC000 (1)

Write-only



0: No effect.

1: A frame beginning with a START bit is transmitted according to the features defined in the mode register.

This action is necessary when the TWI peripheral wants to read data from a slave. When configured in Master Mode with a 
write operation, a frame is sent as soon as the user writes a character in the Transmit Holding Register (TWI_THR).



0: No effect.

1: STOP Condition is sent just after completing the current byte transmission in master read mode.

– In single data byte master read, the START and STOP must both be set. 

– In  multiple data bytes master read, the STOP must be set after the last data received but one.

– In  master read mode, if a NACK bit is received, the STOP is automatically performed.

– In  master data write operation, a STOP condition will be sent after the transmission of the current data is 

finished.



0: No effect.

1: Enables the master mode (MSDIS must be written to 0).

Note: Switching from Slave to Master mode is only permitted when TXCOMP = 1.



0: No effect.

1: The master mode is disabled, all pending data is transmitted. The shifter and holding characters (if it contains data) are 
transmitted in case of write operation. In read operation, the character being transferred must be completely received 
before disabling.

31

30

29

28

27

26

25

24

–

–

–

–

–

–

–

–

23

22

21

20

19

18

17

16

–

–

–

–

–

–

–

–

15

14

13

12

11

10

9

8

–

–

–

–

–

–

–

–

7

6

5

4

3

2

1

0

SWRST

QUICK

SVDIS

SVEN

MSDIS

MSEN

STOP

START