SH7080_09 Datasheet, PDF (454/1622 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family

Section 10 Direct Memory Access Controller (DMAC)
10.3.5 DMA Operation Register (DMAOR)
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.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
-
-
CMS[1:0]
-
-
PR[1:0]
-
-
-
-
-
AE NMIF DME
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R
R R/W R/W R
R R/W R/W R
R
R
R
R R/(W)* R/(W)* R/W
Note: * Writing 0 to this bit after reading it as 1 clears the flag and is the only allowed way.
Initial
Bit
Bit Name Value R/W Description
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 channel's bus modes are set to
cycle steal mode to make valid intermittent mode.
00: Normal mode
01: Setting prohibited
10: Intermittent mode 16
Executes one DMA transfer in each of 16 clocks of an
external bus clock.
11: Intermittent mode 64
Executes one DMA transfer in each of 64 clocks of an
external bus clock.
11, 10 —
All 0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
Rev. 4.00 Dec. 15, 2009 Page 394 of 1558
REJ09B0181-0400