r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 716

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

14. Direct Memory Access Controller (DMAC)
Rev.1.00 Jan. 10, 2008 Page 686 of 1658
REJ09B0261-0100
Bit
15, 14
13, 12
Bit Name
DM[1:0]
SM[1:0]
Initial
Value
00
00
R/W
R/W
R/W
Descriptions
Destination Address Mode 1, 0
Specify whether the DMA destination address is
incremented or decremented.
00: Destination address is fixed
01: Destination address is incremented
10: Destination address is decremented
11: Setting prohibited
For any setting (00, 01, or 10), specifying a transfer size
greater than the bus width divides bus cycles into two or
more, and increases the number of addresses for the
divided bus cycles.
Source Address Mode 1, 0
Specify whether the DMA source address is
incremented or decremented.
00: Source address is fixed
01: Source address is incremented
10: Source address is decremented
11: Setting prohibited
For any setting (00, 01, or 10), specifying a transfer size
greater than the bus width divides bus cycles into two or
more, and increases the number of addresses for the
divided bus cycles.
byte unit transfer: +1
word unit transfer: +2
longword unit transfer: +4
16-byte unit transfer: +16
32-byte unit transfer: +32
byte unit transfer: −1
word unit transfer: −2
longword unit transfer: −4
Setting prohibited in 16/32-byte unit transfer
byte unit transfer: +1
word unit transfer: +2
longword units transfer: +4
16-byte unit transfer: +16
32-byte unit transfer: +32
byte unit transfer: −1
word unit transfer: −2
longword unit transfer: −4
Setting prohibited in 16/32-byte unit transfer