Section 7 DMA Controller (DMAC)
Rev. 3.00 Mar. 14, 2006 Page 144 of 804
REJ09B0104-0300
Bit Bit
Name
Initial
Value R/W Description
31 DTE 0
R/W
Data
Transfer
Enable
Enables/disables a data transfer for the corresponding
channel. When this bit is set to 1, it indicates that the
DMAC is in operation.
Setting this bit to 1 starts a transfer when the auto-
request is selected. When the on-chip module interrupt
or external request is selected, a transfer request after
setting this bit to 1 starts the transfer. While data is
being transferred, clearing this bit to 0 stops the
transfer.
In block transfer mode, if writing 0 to this bit while data is
being transferred, this bit is cleared to 0 after the current
1-block size data transfer.
If an event which stops (sustains) a transfer occurs
externally, this bit is automatically cleared to 0 to stop
the transfer.
Operating modes and transfer methods must not be
changed while this bit is set to 1.
0: Disables a data transfer
1: Enables a data transfer (DMA is in operation)
[Clearing conditions]
•
When the specified total transfer size of transfers is
completed
•
When a transfer is stopped by an overflow interrupt
by a repeat size end
•
When a transfer is stopped by an overflow interrupt
by an extended repeat size end
•
When a transfer is stopped by a transfer size error
interrupt
•
When clearing this bit to 0 to stop a transfer
In block transfer mode, this bit changes after the current
block transfer.
•
When an address error or an NMI interrupt is
requested
•
In the reset state or hardware standby mode
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