LIN Controller (LINFlex)MPC5606S Microcontroller Reference Manual, Rev. 7870 Freescale SemiconductorIt is possible to handle frames with a Response size larger than 8 bytes of data (extended frames). If thedata field length in the BIDR is configured with a value higher than 8 data bytes, the DBEF bit in theLINSR is set once the first 8 bytes have been transmitted. The application has to update the buffer BDRbefore resetting the DBEF bit. The transmission of the next bytes starts when the DBEF bit is reset.Once the last data byte (or the checksum byte) has been sent, the DTF flag is set.The direction of the message buffer is controlled by the DIR bit in the BIDR. When the application setsthis bit the response is sent by LINFlex (publisher). Resetting this bit configures the message buffer assubscriber.23.8.2.1.3 Data reception (transceiver as subscriber)To receive data from a slave node, the master sends a header with the corresponding identifier. LINFlexstores the data received from the slave in the message buffer and stores the message status in the LINSR.If the response has been received successfully, the DRF bit in the LINSR is set. In case of error, the DRFflag is not set and the corresponding error flag is set in the LINESR (refer to Section 23.8.2.1.6, Errorhandling).It is possible to handle frames with a Response size larger than 8 bytes of data (extended frames). If thedata field length in the BIDR is configured with a value higher than 8 data bytes, the DBFF bit in theLINSR is set once the first 8 bytes have been received. The application has to read the buffer BDR beforeresetting the DBFF bit. Once the last data byte (or the checksum byte) has been received, the DRF flag isset.23.8.2.1.4 Data discardTo discard data from a slave, the DIR bit in the BIDR must be reset and the DDRQ bit in LINCR2 mustbe set before starting the header transmission.23.8.2.1.5 Error detectionLINFlex is able to detect and handle LIN communication errors. A code stored in the LIN error statusregister (LINESR) signals the errors to the software.In Master mode, the following errors are detected:• Bit error: During transmission, the value read back from the bus differs from the transmitted value.• Framing error: A dominant state has been sampled on the stop bit of the currently receivedcharacter (synch field, identifier field or data field).• Checksum error: The computed checksum does not match the received one.• Response and Frame timeout: Refer to Section 23.8.3, 8-bit timeout counter for more details.23.8.2.1.6 Error handlingIn case of Bit Error detection during transmission, LINFlex stops the transmission of the frame after thecorrupted bit. LINFlex returns to idle state and an interrupt is generated if the BEIE bit in the LINIER is set.
