186
Bit 0: DE
Description
0
DMA transfer disabled
(Initial value)
1
DMA transfer enabled
9.2.5
DMA Operation Register (DMAOR)
The DMA operation register (DMAOR) is a 16-bit read/write register that controls the DMA
transfer mode. It also indicates the DMA transfer status. It is initialized to H'0000 by a reset and in
standby mode.
Bit:
15
14
13
12
11
10
9
8
Bit name:
——
—
—
—
—
—
PR1
PR0
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
Bit name:
—
—
—
—
—
AE
NMIF
DME
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R/(W)
*
R/(W)
*
R/W
Note:
*
Write only 0 to clear the flag.
•
Bits 15–10 (Reserved): These bits are always read as 0. The write value should always be 0.
•
Bits 9 and 8 (Priority Mode Bits 1 and 0 (PR1 and PR0)): PR1 and PR0 select the priority level
between channels when there are simultaneous transfer requests for multiple channels.
Bit 9: PR1
Bit 8: PR0
Description
0
0
Fixed priority order (Ch. 0 > Ch. 3 > Ch. 2 > Ch. 1) (Initial value)
0
1
Fixed priority order (Ch. 1 > Ch. 3 > Ch. 2 > Ch. 0)
1
0
Round-robin mode priority order (the priority order immediately
after a reset is Ch. 0 > Ch. 3 > Ch. 2 > Ch. 1)
1
1
External-pin round-robin mode priority order (the priority order
immediately after a reset is Ch. 3 > Ch. 2 > Ch. 1 > Ch. 0)
•
Bits 7–3 (Reserved): These bits are always read as 0. The write value should always be 0.
Содержание HD6417032
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Страница 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
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