Section 7 DMA Controller (DMAC)
Rev. 3.00 Mar. 14, 2006 Page 145 of 804
REJ09B0104-0300
Bit Bit
Name
Initial
Value
R/W Description
30 DACKE
0
R/W
DACK
Signal Output Enable
Enables/disables the
DACK
signal output in single
address mode. This bit is ignored in dual address mode.
0: Enables
DACK
signal output
1: Disables
DACK
signal output
29 TENDE
0
R/W
TEND
Signal Output Enable
Enables/disables the
TEND
signal output.
0: Enables
TEND
signal output
1: Disables
TEND
signal output
28
0 R/W
Reserved
This bit is always read as 0. The write value should
always be 0.
27 DREQS
0
R/W
DREQ
Select
Selects whether a low level or the falling edge of the
DREQ
signal used in external request mode is detected.
When a block transfer is performed in external request
mode, clear this bit to 0 to select the low level detection.
0: Low level detection
1: Falling edge detection (the first transfer after a
transfer enabled is detected on a low level)
26
NRD
0
R/W
Next Request Delay
Selects the accepting timing of the next transfer request.
0: Starts accepting the next transfer request after
completion of the current transfer
1: Starts accepting the next transfer request one cycle
after completion of the current transfer
25, 24
All
0
R Reserved
These are read-only bits and cannot be modified.
23 ACT 0
R Active
State
Indicates the operating state for the channel.
0: Waiting for a transfer request or a transfer disabled
state by clearing the DTE bit to 0
1: Active
state
22 to 20
All
0
R Reserved
These are read-only bits and cannot be modified.
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