DEMO9S08EL32AUTO Freescale Semiconductor, DEMO9S08EL32AUTO Datasheet - Page 211
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DEMO9S08EL32AUTO
Manufacturer Part Number
DEMO9S08EL32AUTO
Description
DEMO BOARD EL32 AUTO
Manufacturer
Freescale Semiconductor
Type
MCUr
Datasheets
1.DEMO9S08EL32.pdf
(356 pages)
2.DEMO9S08EL32.pdf
(14 pages)
3.DEMO9S08EL32.pdf
(2 pages)
Specifications of DEMO9S08EL32AUTO
Contents
Board, Cable, CD and Documentation
Processor To Be Evaluated
MC9S08EL32
Data Bus Width
8 bit
Interface Type
RS-232, USB
Operating Supply Voltage
12 V
For Use With/related Products
MC9S08EL32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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on the first data byte. Using CHKMOD in this way allows the SLIC to receive messages with either
method of data consistency check and change on a frame-by-frame basis. If a system uses both types of
data consistency checking methods, the software must simply change the setting of this bit based on the
identifier of each message. If the network only uses one type of check, CHKMOD can be set as a constant
value in the user’s code. If CHKMOD is not written on each frame, care must be taken not to accidentally
modify the bit when writing the data length and TXGO bits. This is especially true if using C code without
carefully inspecting the output of the compiler and assembler.
The control bits and data length code are contained in one register, allowing the user to maximize the
efficiency of the identifier processing by writing a single byte value to indicate the nature of the message
frame. This allows very efficient identifier processing code, which is important in a command frame, as
the master node can be sending data immediately following the identifier byte which might be as little as
one byte in length. The SLIC module uses a separate internal storage area for the incoming data bytes, so
there is no danger of losing incoming data, but the user should spend as little time as possible within the
ISR to ensure that the application or other ISRs are able to use the majority of the CPU bandwidth.
The identifier must be processed in a maximum of 2 byte times on the LIN bus to ensure that the ISR
completes before the checksum would be received for the shortest possible message. This should be easily
achievable, as the only operations required are to read SLCID and look up the checksum method, data
length, and command/request state of that identifier, then write that value to the SLCDLC. This can be
easily streamlined in code with a lookup table of identifiers and corresponding SLCDLC bytes.
12.6.8.2
Handling of extended frames is very similar to handling of standard frames, providing that the length is
less than or equal to 64 bytes. Because the SLIC module can only receive 8 bytes at a time, the receive
buffer must be emptied periodically for long message frames. This is not standard LIN operation, and is
likely only to be used for downloading calibration data or reprogramming FLASH devices in a factory or
service facility, so the added steps required for processing are not as critical to performance. During these
types of operations, the application code is likely very limited in scope and special adjustments can be
made to compensate for added message processing time.
For extended command frames, the data length is still written one time at the time the identifier is decoded,
along with the TXGO and CHKMOD bits. When this is done, a software counter must also be initialized
to keep track of how many bytes are expected to be received in the message frame. The ISR completes,
clearing the SLCF flag, and resumes application execution. The SLIC will generate an interrupt, if
Freescale Semiconductor
Extended Command Message Frames
Once the ID is decoded for a message header and a length code written to
SLCDLC, the SLIC is expecting that number of bytes to be received. If the
SLIC module doesn't receive the number of bytes indicated in the SLCDLC
register, it will continue to look for data bytes. If another message header
begins, a byte framing error will trigger on the break symbol of that second
message. The second message will still properly generate an ID received
interrupt, but the byte framing error prior to this is an indication to the
application that the previous message was not properly handled and should
be discarded.
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
NOTE
213
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