參數(shù)資料
型號: MC68HC908QL3VDT
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 2 MHz, MICROCONTROLLER, PDSO16
封裝: TSSOP-16
文件頁數(shù): 78/244頁
文件大?。?/td> 3228K
代理商: MC68HC908QL3VDT
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Slave LIN Interface Controller (SLIC)
Handling Command Message Frames
MC68HC908QL Family
Data Sheet
MOTOROLA
Slave LIN Interface Controller (SLIC)
169
The SLIC transmit go (TXGO) bit should be 0 for command frames, indicating to
the SLIC that data is coming from the master. The checksum mode control
(CHKMOD) bit allows the user to select which method of checksum calculation is
desired for this message frame. The LIN 1.3 checksum does not include the
identifier byte in the calculation, while the SAE version does include this byte. Since
the identifier is already received by the SLIC by this time, the default is to include
it in the calculation. If a LIN 1.3 checksum is desired, a 1 in the CHKMOD bit will
reset the checksum circuitry to begin calculating the checksum on the first data
byte. Using the CHKMOD bit 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, the CHKMOD bit 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 the SLCID register 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.
14.11.2 Extended Command Message Frames
Handling of extended frames is very similar to handling of standard frames,
providing that the length is less than or equal to 64 bytes. Since 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.
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