5.15.13 LIN transceiver TXD pin dominant timeout function
(Submit Feedback)An internal timer prevents the LIN bus line from being driven permanently in the dominant state. If TXD is forced low longer than tto(dom)_LIN, the LIN transceiver will be disabled. The transceiver state can be checked in the DSR1 register, LTXDOUTS bit. Furthermore, to ensure that the transceiver is not disabled, the LTXS bit from the DSR1 Register needs to be checked before any operation. To reactivate the LIN transceiver, TXD must be switched to high for longer than 10 μs.
If the TXD pin stays at low level while switching into LIN Normal mode, it must be pulled to high level longer than 10 μs before the LIN driver can be activated. This feature prevents the bus line from being accidentally driven to the dominant state after normal mode has been activated (also in case of a short circuit at TXD to GND).
TXD Dominant Timeout function is activated in LIN Normal mode.