Atmel Xplained Evaluation Board AT32UC3A3-XPLD AT32UC3A3-XPLD Data Sheet

32072H–AVR32–10/2012

The minimum frame slot size is determined by TFrame_Maximum, and calculated below (all val-
ues in bit periods):

• THeader_Nominal = 34

• TFrame_Maximum = 1.4 x (THeader_Nominal + TResponse_Nominal + 1)

Note:

The term “+1” leads to an integer result for TFrame_Max (LIN Specification 1.3)

If the Checksum is sent (CHKDIS=0):

• TResponse_Nominal = 10 x (NData + 1)

• TFrame_Maximum = 1.4 x (34 + 10 x (DLC + 1 + 1) + 1)

• TFrame_Maximum = 77 + 14 x DLC

If the Checksum is not sent (CHKDIS=1):

• TResponse_Nominal = 10 x NData

• TFrame_Maximum = 1.4 x (34 + 10 x (DLC + 1) + 1)

• TFrame_Maximum = 63 + 14 x DLC

This section describes the errors generated in LIN mode, and the coresponding error bits in
CSR. The error bits are cleared by writing a one to CR.RSTSTA. An interrupt request is gener-
ated if the corresponding bit in the Interrupt Mask Register (IMR) is set. This bit is set by writing
a one to the corresponding bit in the Interrupt Enable Register (IER). 

• Slave Not Responding Error (CSR.LINSNRE)

– This error is generated if no valid message appears within the TFrame_Maximum 

time frame slot, while the USART is expecting a response from another node 
(NACT=SUBSCRIBE).

• Checksum Error (CSR.LINCE)

– This error is generated if the received checksum is wrong. This error can only be 

generated if the checksum feature is enabled (CHKDIS=0).

• Identifier Parity Error (CSR.LINIPE)

– This error is generated if the identifier parity is wrong. This error can only be 

generated if parity is enabled (PARDIS=0).

• Inconsistent Sync Field Error (CSR.LINISFE)

– This error is generated in slave mode if the Sync Field character received is not 

0x55. Synchronization procedure is aborted.

• Bit Error (CSR.LINBE)

– This error is generated if the value transmitted by the USART on Tx differs from the 

value sampled on Rx. If a bit error is detected, the transmission is aborted at the 
next byte border.

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

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

CHKTYPE, DLM, FSDIS, and DLC

• Select LIN mode and master node by writing 0xA to MR.MODE