Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet
Product codes
ATSAM4L-XSTK
597
42023E–SAM–07/2013
ATSAM4L8/L4/L2
24.6.10.1
Modes of Operation
Changing LIN mode after initial configuration must be followed by a transceiver software reset in
order to avoid unpredictable behavior.
order to avoid unpredictable behavior.
24.6.10.2
Receiver and Transmitter Control
24.6.10.3
Baud Rate Configuration
The LIN nodes baud rate is configured in the Baud Rate Generator Register (BRGR),
The LIN slave node copies the initial BRGR value to the LIN Baud
Rate Register (LINBRR), and updates LINBRR after successful synchronization.
24.6.10.4
Character Transmission and Reception
, and
24.6.10.5
Header Transmission (Master Node Configuration)
All LIN frames start with a header sent by the master. As soon as the identifier has been written
to the Identifier Character field in the LIN Identifier Register (LINIR.IDCHR), CSR.TXRDY is
cleared and the header is sent. The header consists of a Break field, a Sync field, and an Identi-
fier field. CSR.TXRDY is set when the identifier has been transferred into the transmitters shift
register. An interrupt request is generated if IMR.TXRDY is set.
to the Identifier Character field in the LIN Identifier Register (LINIR.IDCHR), CSR.TXRDY is
cleared and the header is sent. The header consists of a Break field, a Sync field, and an Identi-
fier field. CSR.TXRDY is set when the identifier has been transferred into the transmitters shift
register. An interrupt request is generated if IMR.TXRDY is set.
The Break field consists of 13 dominant bits (the break) and one recessive bit (the break delim-
iter). The Sync field consists of a start bit, the Sync byte (the character 0x55), and a stop bit,
refer to
iter). The Sync field consists of a start bit, the Sync byte (the character 0x55), and a stop bit,
refer to
. The Identifier field contains the Identifier as written to LINIR.IDCHR. The
identifier parity bits can be generated automatically (see
Figure 24-28. Header Transmission
.
24.6.10.6
Header Reception (Slave Node Configuration)
The USART stays idle until it detects a break field, consisting of at least 11 consecutive domi-
nant bits (zeroes) on the bus. A received break will set the Lin Break bit (CSR.LINBK). An
interrupt request is generated if the Lin Break bit in the Interrupt Mask Register (IMR.LINBK) is
set. The Sync field is used to synchronize the baud rate (see
nant bits (zeroes) on the bus. A received break will set the Lin Break bit (CSR.LINBK). An
interrupt request is generated if the Lin Break bit in the Interrupt Mask Register (IMR.LINBK) is
set. The Sync field is used to synchronize the baud rate (see
). IDCHR is
updated and the LIN Identifier bit (CSR.LINID) is set when the Identifier has been received. An
interrupt request is generated if the Lin Identifier bit in the Interrupt Mask Register (IMR.LINID) is
set. The Identifier parity bits can be automatically checked (see
interrupt request is generated if the Lin Identifier bit in the Interrupt Mask Register (IMR.LINID) is
set. The Identifier parity bits can be automatically checked (see
). If the header
TXD
Baud Rate
Clock
Start
Bit
Write
LINIR
1
0
1
0
1
0
1
0
TXRDY
Stop
Bit
Start
Bit
ID0 ID1 ID2 ID3 ID4 ID5 ID6 ID7
Break Field
13 dominant bits (at 0)
Stop
Bit
Break
Delimiter
1 recessive bit
(at 1)
Synch Byte = 0x55
LINIR
ID