45.6.10.12.1 Configuration

The DMA mode is configured in USLONMR.DMAM:

DMAM = 1: The LON frame data length (DATAL) is stored in the WRITE buffer and it is written by the DMA in US_THR (instead of the LON Data Length register US_LONDL).
DMAM = 0: The LON frame data length (DATAL) is not stored in the WRITE buffer and it must be written by the user in US_LONDL.

In both DMA modes L2HDR is considered as a data and its value must be stored in the WRITE buffer as the first data to write.

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