SPRUIN7C March 2020 – March 2024 TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1
DMA functionality is enabled/disabled by the CPU with SET TX DMA/CLR TX DMA bits, respectively.
In multibuffered SCI mode once TXRDY bit is set or after a transmission of programmed number of characters (LENGTH) (up to eight data bytes stored in the transmit buffers (TDy) in the LINTD0 and LINTD1 registers), a DMA request is generated to reload the transmit buffer for the next transmission. If the multibuffer option is disabled, then DMA requests are generated on a byte-per-byte basis.