SH7763 Datasheet, PDF (650/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 14 Direct Memory Access Controller (DMAC)
14.3.8 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. DMAOR is a common register for
channel 0 to 5.
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
Bit
15, 14
13, 12
11, 10
Bit Name
—
Initial
Value
All 0
CMS[1:0] 00
—
All 0
R/W
R
R/W
R
Descriptions
Reserved
These bits are always read as 0. The write value should
always be 0.
Cycle Steal Mode Select
Select either normal mode or intermittent mode in cycle
steal mode.
It is necessary that all channel 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.
Reserved
These bits are always read as 0. The write value should
always be 0.
Rev. 1.00 Oct. 01, 2007 Page 584 of 1956
REJ09B0256-0100