CHAPTER 12 DMA FUNCTIONS
User’s Manual U13850EJ6V0UD
455
The correspondence between DRAn setting value and internal RAM area is shown below.
(a) V850/SB1 (
µµµµ
PD703031B, 703031BY), V850/SB2 (
µµµµ
PD703034B, 703034BY)
Set the DRAn register to a value in the range of 0000H to 1FFFH (n = 0 to 5).
Setting is prohibited for values between 2000H and 3FFFH.
Figure 12-2. Correspondence Between DRAn Setting Value and Internal RAM (8 KB)
xxFFFFFFH
xxFFD000H
xxFFCFFFH
xxFFF000H
xxFFEFFFH
xxFF8000H
xxFF7FFFH
Access-prohibited area
Expansion ROM are
On-chip peripheral
I/O area
Internal RAM area
(DRAn setting value)
(1FFFH)
(0000H)
8 KB (usable for DMA)
Cautions 1. Do not set odd addresses for 16-bit transfer (DCHCn register DSn = 1).
2. While the increment function is being used (DCHCn register DDADn = 0), if the DRAn
register value is set to 1FFFH, it will be incremented to 2000H, and will thus become a
setting-prohibited value.
Remark
The DRAn register setting values are in parentheses.
Содержание V850/SB1
Страница 2: ...User s Manual U13850EJ6V0UD 2 MEMO ...