Chapter 23 LIN Physical Layer (S12LINPHYV2)
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
770
Freescale Semiconductor
Figure 23-12. Overcurrent interrupt handling
23.4.4.2
TxD-dominant timeout Interrupt
To protect the LIN bus from a network lock-up, the LIN Physical Layer implements a TxD-dominant
timeout mechanism. When the LPTxD signal has been dominant for more than t
DTLIM
the transmitter is
disabled and the LPDT status flag and the LPDTIF interrupt flag are set.
In order to re-enable the transmitter again, the following prerequisites must be met:
1) TxD-dominant condition is over (LPDT=0)
2) LPTxD is recessive or the LIN Physical Layer is in shutdown or receive only mode for a
minimum of a transmit bit time
To re-enable the transmitter then, the LPDTIF flag must be cleared (by writing a 1).
NOTE
Please make sure that LPDTIF=1 before trying to clear it. It is not allowed
to try to clear LPDTIF if LPDTIF=0 already.
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