MC9S08EL32 Datasheet, PDF (198/356 Pages) Freescale Semiconductor, Inc – 8-Bit HCS08 Central Processor Unit (CPU)

method was employed for this message frame. Refer to the LIN specification for more details on
the calculations.
• Byte Framing Error
This error comes from the standard UART definition for byte encoding and occurs when the STOP
bit is sampled and reads back as a 090. STOP should always read as 1.
NOTE
A byte framing error can also be an indication that the number of data bytes
received in a LIN message frame does not match the value written to the
SLCDLC register. See Section 12.6.7, “Handling LIN Message Headers,”
for more details.
• Identifier Received Successfully
This interrupt source indicates that a LIN identifier byte has been received with correct parity and
is waiting in the LIN identifier buffer (SLCID). Upon reading this interrupt source from SLCSV,
the user can then decode the identifier in software to determine the nature of the LIN message
frame. To clear this source, SLCID must be read.
• Identifier-Parity-Error
A parity error in the identifier (i.e., corrupted identifier) will be flagged. Typical LIN slave
applications do not distinguish between an unknown but valid identifier, and a corrupted identifier.
However, it is mandatory for all slave nodes to evaluate in case of a known identifier all eight bits
of the ID-Field and distinguish between a known and a corrupted identifier. The received identifier
value is reported in SLCID so that the user software can choose to acknowledge or ignore the parity
error message. Once the ID parity error has been detected, the SLIC will begin looking for another
LIN header and will not receive message data, even if it appears on the bus.
• Wakeup
The wakeup interrupt source indicates that the SLIC module has entered SLIC run mode from
SLIC stop mode.
12.3.5.2 Byte Transfer Mode Operation
When byte transfer mode is enabled (BTM = 1), many of the interrupt sources for the SLCSV no longer
apply, as they are specific to LIN operations. Table 12-9 shows those interrupt sources which are
applicable to BTM operations. The value of the SLCSV for each interrupt source remains the same, as well
as the priority of the interrupt source.
I
Table 12-9. Interrupt Sources Summary (BTM = 1)
SLCSV
0x00
0x0C
0x14
0x18
0x1C
I3 I2 I1 I0
0000
0011
0101
0110
0111
Interrupt Source
No Interrupts Pending
TX Message Buffer Empty
RX Data Buffer Full
No Errors
Bit-Error
Receiver Buffer Overrun
Priority
0 (Lowest)
3
5
6
7
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
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