Atmel SAM4L-EK Atmel ATSAM4L-EK ATSAM4L-EK Data Sheet

42023E–SAM–07/2013

 CMDR

 Read/Write

 0x0C

 0x00000000

3-bit code to be prefixed with 0b00001 to form a unique 8-bit HS-mode master code (0000 1XXX).

0: Causes the TWIM not to initiate HS-mode transfer.

1: Causes the TWIM to initiate HS-mode transfer.

0: Causes the last byte in master receive mode (when NBYTES has reached 0) to be NACKed. This is the standard way of 

ending a master receiver transfer.

1: Causes the last byte in master receive mode (when NBYTES has reached 0) to be ACKed. Used for performing linked 

transfers in master receiver mode with no STOP or REPEATED START between the subtransfers. This is needed when more 

than 255 bytes are to be received in one single transmission.

0: Causes the transfer not to use PEC byte verification. The PEC LFSR is still updated for every bit transmitted or received. Must 

be used if SMBus mode is disabled.

1: Causes the transfer to use PEC. PEC byte generation (if master transmitter) or PEC byte verification (if master receiver) will 

be performed.

The number of data bytes in the transfer. After the specified number of bytes have been transferred, a STOP condition is 

transmitted if CMDR.STOP is one. In SMBus mode, if PEC is used, NBYTES includes the PEC byte, i.e. there are NBYTES-1 

data bytes and a PEC byte.

0: Indicates that CMDR does not contain a valid command.

1: Indicates that CMDR contains a valid command. This bit is cleared when the command is finished.

0: Do not transmit a STOP condition after the data bytes have been transmitted.

1: Transmit a STOP condition after the data bytes have been transmitted.

0: The transfer in CMDR should not commence with a START or REPEATED START condition.

31

30

29

28

27

26

25

24

-

HSMCODE

-

HS

ACKLAST

PECEN

23

22

21

20

19

18

17

16

NBYTES

15

14

13

12

11

10

9

8

VALID

STOP

START

REPSAME

TENBIT

SADR[9:7]

7

6

5

4

3

2

1

0

SADR[6:0]

READ