Operation From Starting To End/Stopping - Fujitsu FR60 Hardware Manual

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CHAPTER 16 DMA CONTROLLER (DMAC)

Operation from Starting to End/Stopping

Starting of DMA transfer is controlled independently for each channel, but before

transfer starts, the operation of all channels needs to be enabled.

■ Enabling Operation for All Channels

Before activating each DMAC channel, operation for all channels needs to be enabled in advance with the

DMA operation enable bit (DMAE of DMACR).

All start settings and transfer requests that occurred before operation is enabled are invalid.

■ Starting Transfer

The transfer operation can be started by the operation enable bit of the control register for each channel. If a

transfer request to an activated channel is accepted, the DMA transfer operation is started in the specified

■ Starting from a Temporary Stop

If a temporary stop occurs before starting with channel-by-channel or all-channel control, the temporary

stopped state is maintained even though the transfer operation is started. If transfer requests occur in the

meantime, they are accepted and retained.

When temporary stopping is released, transfer is started.

Mb91350a series