SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
In Basic mode, the µDMA controller performs transfers as long as there are more items to transfer, and a transfer request is present. This mode is used with peripherals that assert a µDMA request signal whenever the peripheral is ready for a data transfer. Basic mode should not be used in any situation where the request is momentary even though the entire transfer should be completed. For example, a software-initiated transfer creates a momentary request, and in Basic mode, only the number of transfers specified by the ARBSIZE field in the DMA Channel Control Word (DMACHCTL) register is transferred on a software request, even if there is more data to transfer.
When all of the items have been transferred using Basic mode, the µDMA controller sets the mode for that channel to Stop.
Basic mode can be programmed to ignore when XFERSIZE reaches 0x000 and continue copying on request until the channel is stopped manually. If the NXTUSEBURST bit in the µDMA Channel Control Word (DMACHCTL) register is set while in Basic mode and the XFERSIZE reaches 0x000 and is not written back, transfers continue until the request is deasserted by the peripheral.