“Auto-Repeat” configures a DMA channel to move a block of data, after which it alerts the CPU and then re-initializes the channel to repeat the operation. During re-initialization, the dual port SRAM buffer pointer is reset to the start address of the buffer, and the transfer count register is reset, as shown by the red arrow. It’s useful for moving frequent packets of data to or from serial peripherals, or data from an A to D configured for continuous conversion.