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

42023E–SAM–07/2013

Figure 24-36. Master Node Configuration, LINMR.NACT is 0x2 (IGNORE)

• Configure the baud rate by writing to BRGR.CD and BRGR.FP

• Configure the frame transfer by writing to  LINMR fields NACT, PARDIS, CHKDIS, CHKTYPE, 

DLM, and DLC

• Select LIN mode and slave node by writing 0xB to MR.MODE

• Write a one to CR.TXEN and CR.RXEN to enable both transmitter and receiver

• Wait until CSR.LINID is one

• Check for CSR.LINISFE and CSR.LINPE errors, clear errors and CSR.LINID by writing a one 

to CR.RSTSTA

• Read LINIR.IDCHR

IMPORTANT: If LINMR.NACT is 0x0 (PUBLISH), and this field is already correct, the LINMR
register must still be written with this value in order to set CSR.TXRDY, and to request the corre-
sponding Peripheral DMA Controller write transfer.

The different LINMR.NACT settings result in the same procedure as for the master node, see

Figure 24-37. Slave Node Configuration, LINMR.NACT is 0x0 (PUBLISH)

TXRDY

Write

LINIR

RXRDY

LINTC

Break

Synch

Protected

Identifier

Data 1

Data N

Checksum

Data N-1

Header

Inter-

frame

space

Response

space

Frame

Frame slot = TFrame_Maximum

Response

Data3

FSDIS=1

FSDIS=0

Break

Synch

Protected

Identifier

Data 1

Data N

Checksum

TXRDY

Write

THR

Read

LINID

Data 1

Data 3

Data N-1

Data N

RXRDY

LINIDRX

Data 2

LINTC