SPRUJ53B April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
This DMA functionality is enabled/disabled by the CPU using the SETRXDMA/CLRRXDMA bits, respectively.
In multibuffered SCI mode with DMA enabled, the receiver loads the RDy buffers for each received character. RXDMA request is triggered once the last character of the programmed number of characters (LENGTH) are received and copied to the corresponding RDy buffer successfully.
If the multibuffer option is disabled, then DMA requests are generated on a byte-per-byte basis.
In multiprocessor mode, the SCI can generate receiver interrupts for address frames and DMA requests for data frames or DMA requests for both. This is controlled by the SET_RX_DMA_ALL bit.
In multiprocessor mode with the SLEEP bit set, no DMA request is generated for received data frames. The software must clear the SLEEP bit before data frames can be received.