CHAPTER 13 DMA FUNCTIONS
User’s Manual U15109EJ3V0UD
474
The following shows the correspondence between the DRAn setting value and the internal RAM area.
(a) V850/SC1 (
µµµµ
PD703068Y, 70F3089Y)
V850/SC2 (
µµµµ
PD703069Y, 70F3089Y)
V850/SC3 (
µµµµ
PD703088Y, 703089Y, 70F3089Y)
Set the DRAn register to a value in the range of 0000H to 0FFFH or 1000H to 3FFFH (n = 0 to 5).
Figure 13-2. Correspondence Between DRAn Setting Value and Internal RAM
xxFFFFFFH
xxFF9000H
xxFF8FFFH
xxFFF000H
xxFFEFFFH
xxFF8000H
xxFF7FFFH
Access-prohibited
area
Expansion ROM area
Internal peripheral
I/O area
Internal RAM area
(DRAn setting value)
(0FFFH)
(1000H)
(0000H)
(3FFFH)
xxFFC000H
xxFFBFFFH
12 KB (usable for DMA)
4 KB (usable for DMA)
xxFFE000H
xxFFDFFFH
Caution
Do not set odd addresses for 16-bit transfer (DCHCn register DSn = 1).
Remark
The values in parentheses indicate the DRAn register setting values.