Transfer Request Acceptance And Transfer - Fujitsu FR60 Hardware Manual

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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

been checked.

Mb91350a series