Transfer Request Acceptance and Transfer
This section describes transfer request acceptance and transfer.
■ Transfer Request Acceptance and Transfer
Sampling for transfer requests set for each channel starts after starting.
If edge detection is selected for the external pin start source and a transfer request is detected, the request is
retained within DMAC until the clear conditions are met (when the external pin start source is selected for
block, step, or burst transfer).
If level detection or peripheral interrupt start is selected for the external pin start source, DMAC continues
the transfer until all transfer requests are cleared. When they are cleared, DMAC stops the transfer after one
transfer unit (demand transfer or peripheral interrupt start).
Since peripheral interrupts are handled as level detection, use interrupt clear by DMA to handle the
Transfer requests are always accepted while other channel requests are being accepted and transfer
performed. The channel that will be used for transfer is determined for each transfer unit after priority has