Section 14 Direct Memory Access Controller (DMAC)
Rev.1.00 Dec. 13, 2005 Page 581 of 1286
REJ09B0158-0100
14.3.8
DMA Operation Register 0, 1 (DMAOR0 and DMAOR1)
DMAOR is a 16-bit readable/writable register that specifies the priority level of channels at the
DMA transfer. This register shows the DMA transfer status. DMAOR 0 is for channel 0 to 5, and
DMAOR1 is for channel 6 to11.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R
R
R/W
R/W
R
R
R/W
R/W
R
R
R
R
R
R/(W)
*
R/(W)
*
R/W
CMS[1:0]
PR[1:0] AE
NMIF DME
Bit:
Initial value:
R/W:
Bit Bit
Name
Initial
Value R/W Descriptions
15, 14
—
All 0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
13,
12 CMS[1:0]
00
R/W Cycle Steal Mode Select 1, 0
Select either normal mode or intermittent mode in cycle
steal mode.
It is necessary that all channels 0 to 5 (DMAOR0) or 6
to 11 (DMAOR1) bus modes are set to cycle steal mode
to make valid intermittent mode.
00: Normal mode
01: Setting prohibited
10: Intermittent mode 16
Issues a bus request after waiting 16 Bck clocks
and executes one DMA transfer.
11: Intermittent mode 64
Issues a bus request after waiting 64 Bck clocks
and executes one DMA transfer.
11, 10
—
All 0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
Содержание SH7780 Series
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