Datasheet

610
32117D–AVR-01/12
AT32UC3C
25.6.9.11 Response Data Length
The LIN response data length is the number of data fields (bytes) of the response excluding the
checksum.
The response data length can either be configured by the user or be defined automatically by
bits 4 and 5 of the Identifier (compatibility to LIN Specification 1.1). The user can choose
between these two modes by the DLM bit of the LIN Mode register (LINMR):
• DLM = 0: the response data length is configured by the user via the DLC field of the LIN
Mode register (LINMR). The response data length is equal to (DLC + 1) bytes. DLC can be
programmed from 0 to 255, so the response can contain from 1 data byte up to 256 data
bytes.
• DLM = 1: the response data length is defined by the Identifier (IDCHR in LINIR) according to
the table below. The DLC field of the LIN Mode register (LINMR) is discarded. The response
can contain 2 or 4 or 8 data bytes.
Figure 25-43. Response Data Length
Table 25-14. Response Data Length if DLM = 1
IDCHR[5] IDCHR[4] Response Data Length [bytes]
00 2
01 2
10 4
11 8
User configuration: 1 - 256 data fields (DLC+1)
Identifier configuration: 2/4/8 data fields
Sync
Break
Sync
Field
Identifier
Field
Checksum
Field
Data
Field
Data
Field
Data
Field
Data
Field