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

42023E–SAM–07/2013

Minimum nominal clock frequency without a fractional part:

Examples:

• Baud rate = 20 kbit/s, OVER=0 (Oversampling 16x) => F

Nom

(min) = 19.12MHz

• Baud rate = 20 kbit/s, OVER=1 (Oversampling 8x) => F

Nom

(min) = 9.71MHz

• Baud rate = 1 kbit/s, OVER=0 (Oversampling 16x) => F

Nom

(min) = 956 kHz

• Baud rate = 1 kbit/s, OVER=1 (Oversampling 8x) => F

Nom

(min) = 485 kHz

An identifier field consists of two sub-fields; the identifier and its parity. Bits 0 to 5 are assigned
to the identifier, while bits 6 and 7 are assigned to parity. Automatic parity management is
enabled by default, and can be disabled by writing a one to the Parity Disable bit in the LIN
Mode register (LINMR.PARDIS).

• LINMR.PARDIS=0: During header transmission, the parity bits are computed and in the shift 

register they replace bits 6 and 7 from LINIR.IDCHR. During header reception, the parity bits 
are checked and can generate a LIN Identifier Parity Error (see 

and 7 in LINIR.IDCHR read as zero when receiving.

• LINMR.PARDIS=1: During header transmission, all the bits in LINIR.IDCHR are sent on the 

bus. During header reception, all the bits in LINIR.IDCHR are updated with the received 
Identifier.

After an identifier transaction, a LIN response mode must be selected. This is done in the Node
Action field (LINMR.NACT). Below are some response modes exemplified in a small LIN cluster:

• Response, from master to slave1:

Master: NACT=PUBLISH

Slave1: NACT=SUBSCRIBE

Slave2: NACT=IGNORE

• Response, from slave1 to master:

Master: NACT=SUBSCRIBE

Slave1: NACT=PUBLISH

Slave2: NACT=IGNORE

• Response, from slave1 to slave2:

Master: NACT=IGNORE

Slave1: NACT=PUBLISH

Slave2: NACT=SUBSCRIBE

4

–

α +4     -1 β +1

< <

≤ ≤

F

Nom

min

(

)

100

4

8

2

OVER

–

(

)

×

×

1

+

[

] Baudrate

×

8

15

–
100

----------

1

+

⎝

⎠

⎛

⎞

×

1%

×

-----------------------------------------------------------------------------------------------

×

⎝

⎠

⎜

⎟

⎜

⎟

⎜

⎟

⎛

⎞

Hz

=