CHAPTER 13 DMA FUNCTIONS (DMA CONTROLLER)
Preliminary User’s Manual U15905EJ1V0UD
407
13.3.3 DMA byte count registers 0 to 3 (DBC0 to DBC3)
These 16-bit registers are used to set the byte transfer count for DMA channels n (n = 0 to 3). They store the
remaining transfer count during DMA transfer.
These registers can be read or written in 16-bit units.
Remark
If the DBCn register is read during DMA transfer after a terminal count has occurred without the register
being overwritten, the value set immediately before the DMA transfer will be read out (0000H will not be
read, even if DMA transfer has ended).
DBCn
(n = 0 to 3)
Byte transfer count 1 or remaining byte transfer count
Byte transfer count 2 or remaining byte transfer count
:
Byte transfer count 65,536 (2
16
) or remaining byte transfer count
BC15 to
BC0
0000H
0001H
:
FFFFH
Byte transfer count setting or remaining
byte transfer count during DMA transfer
After reset:
Undefined R/W
Address:
DBC0: FFFFF0C0H, DBC1: FFFFF0C2H,
DBC2: FFFFF0C4H, DBC3: FFFFF0C6H
BC7
BC6
BC5
BC4
BC3
BC2
BC1
BC0
BC15
BC14
BC13
BC12
BC11
BC10
BC9
BC8
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
Содержание V850ES/SA2 UPD703201
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