PXS20RM Datasheet, PDF (980/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

LIN Controller (LINFlexD)
Master Task
Slave Task 1
Slave Task 2
Header
Header
Response
Header
Response
Frame slot
Frame
Response
space
Response
Figure 31-3. LIN frame structure
31.3.3 LIN header
The header consists of:
• A break field (described in Section 31.3.3.1, Break field)
• A sync pattern (described in Section 31.3.3.2, Sync pattern)
• An identifier (described in Section 31.3.4.2, Identifier)
The slave task associated with the identifier provides the response.
31.3.3.1 Break field
The break field, shown in Figure 31-4, is used to signal the beginning of a new frame. It is always
generated by the master and consists of:
• At least 13 dominant bits including the start bit
• At least one recessive bit that functions as break delimiter
Start
bit
Figure 31-4. Break field
Break
Delimiter
31.3.3.2 Sync pattern
The sync pattern is a byte consisting of alternating dominant and recessive bits as shown in Figure 31-5.
It forms a data value of 0x55.
31-4
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor