CHAPTER 12 DMA FUNCTIONS
User’s Manual U13850EJ4V0UM
361
12.3.2 DMA internal RAM address registers 0 to 5 (DRA0 to DRA5)
These registers set DMA channel n internal RAM addresses (n = 0 to 5).
Since each product has a different internal RAM capacity, the internal RAM areas that are usable for DMA differ
depending on the product. The internal RAM areas that can be set in DRAn registers for each product are shown
below.
Table 12-1. Internal RAM Area Usable in DMA
Product
Internal RAM
Capacity
RAM Size
Usable in DMA
RAM Area Usable in DMA
V850/SB1
µ
PD703031A, 703031AY
V850/SB2
µ
PD703034A, 703034AY
12 KB
12 KB
xxFFC000H to xxFFEFFFH
V850/SB1
µ
PD703033A, 703033AY, 70F3033A, 70F3033AY
V850/SB2
µ
PD703035A, 703035AY, 70F3035A, 70F3035AY
16 KB
16 KB
xxFFB000H to xxFFEFFFH
V850/SB1
µ
PD703030A, 703030AY
V850/SB2
µ
PD703036A, 703036AY
20 KB
12 KB
xxFFA000H to xxFFBFFFH,
xxFFE000H to xxFFEFFFH
V850/SB1
µ
PD703032A, 703032AY, 70F3032A, 70F3032AY
V850/SB2
µ
PD703037A, 703037AY, 70F3037A, 70F3037AY
24 KB
16 KB
xxFF9000H to xxFFBFFFH,
xxFFE000H to xxFFEFFFH
An address is incremented after each transfer is completed, when the DADn bit of the DCHDn register is 0. The
incrementation value is “1” during 8-bit transfers and “2” during 16-bit transfers (n = 0 to 5).
These registers are can be read/written in 16-bit units.
Figure 12-2. Format of DMA Internal RAM Address Registers 0 to 5 (DRA0 to DRA5)
After reset: Undefined
R/W
Address: DRA0
FFFFF182H
DRA3
FFFFF1B2H
DRA1
FFFFF192H
DRA4
FFFFF1C2H
DRA2
FFFFF1A2H
DRA5
FFFFF1D2H
15
14
13
0
DRAn
0
0
RAn13 to RAn0
(n = 0 to 5)
Содержание MPD703030A
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