Datasheet

1 to 8 Data Fields
Response
Checksum
Field
interbyte spaces
www.ti.com LIN
28.3.1.2.2 Response
The format of the response is as illustrated in Figure 28-14. There are two types of fields in a response:
data and checksum. The data field consists of exactly one data byte, one start bit, and one stop bit, for a
total of 10 bits. The LSB is transmitted first. The checksum field consists of one checksum byte, one start
bit and one stop bit. The checksum byte is the inverted modulo-256 sum over all data bytes in the data
fields of the response.
Figure 28-14. Response Format of LIN Message Frame
The format of the response is a stream of N data fields and one checksum field. Typically N is from 1 to 8,
with the exception of the extended command frames (Section 28.3.1.6). The length N of the response is
indicated either with the optional length control bits of the ID Field (this is used in standards earlier than
LIN 1.x); see Table 28-5, or by LENGTH value in SCIFORMAT[18:16] register; see Table 28-6. The
SCI/LIN module supports response lengths from 1 to 8 bytes in compliance with LIN 2.0.
Table 28-5. Response Length Info Using IDBYTE Field Bits [5:4] for LIN Standards Earlier than 1.3
ID5 ID4 Number of Data bytes
0 0 2
0 1 2
1 0 4
1 1 8
Table 28-6. Response Length with SCIFORMAT[18:16] Programming
SCIFORMAT[18:16] No. of Bytes
000 1
001 2
010 3
011 4
100 5
101 6
110 7
111 8
1365
SPNU562–May 2014 Serial Communication Interface (SCI)/Local Interconnect Network (LIN)
Module
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