SH7785 Datasheet, PDF (711/1692 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

14. Direct Memory Access Controller (DMAC)
14.3.7 DMA Channel Control Registers 0 to 11 (CHCR0 to CHCR11)
CHCR are 32-bit readable/writable registers that control the DMA transfer mode.
Bit:
Initial value:
R/W:
31 30 29
LCKN
010
R R/W R
28 27 26 25 24 23 22 21 20 19 18 17 16
RPT[2:0]
DO RL
TS2 HE HIE AM AL
0
0
0
0
0
0
00
0
0
0
0
0
R R/W R/W R/W R R/W R/W R R/W R/(W)* R/W R/W R/W
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
DM[1:0]
SM[1:0]
RS[3:0]
DL DS TB TS[1:0] IE TE DE
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/(W)* R/W
Note: * R/(W): To clear the flag, 0 can be written to.
Initial
Bit
Bit Name Value R/W Descriptions
31
⎯
0
R
Reserved
This bit is always read as 0. The write value should
always be 0.
30
LCKN
1
R/W Bus Lock Signal Disable
Specifies whether the bus lock signal output is enabled
or disabled during a read instruction for the
SuperHyway bus. This bit is valid in cycle steal mode.
Clear this bit to 0 in burst mode.
If the bus lock signal is disabled, the bus request from
the bus master other than the DMAC can be accepted.
This can improve the bus usage efficiency in the
system.
For channels 0 to 5, this bit can be set to 0 or 1.
For channels 6 to 11, do not clear this bit to 0. The write
value should always be 1.
0: Bus lock signal output enabled
1: Bus lock signal output disabled
29, 28 ⎯
All 0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
Rev.1.00 Jan. 10, 2008 Page 681 of 1658
REJ09B0261-0100