CHAPTER 12 NBD FUNCTION (
µµµµ
PD70F3116)
639
User’s Manual U14492EJ3V0UD
(5) DMA destination address setting register DL (NBDMDL)
NBDMDL register specifies a DMA destination address.
It can be written from the NBD tool and read by DMA (CPU).
It can be read only in 16-bit units.
14
AD14
13
AD13
12
AD12
2
AD2
3
AD3
4
AD4
5
AD5
6
AD6
7
AD7
8
AD8
9
AD9
10
AD10
11
AD11
15
AD15
1
AD1
0
AD0
NBDMDL
Address
FFFFFA68H
Initial value
Undefined
Remarks 1.
When writing RAM using the NBD tool, an address signal from the NBD tool can be read from
the NBDMDL register by DMA (CPU).
2.
When reading RAM using the NBD tool, the NBDL register value can be read from the NBDMDL
register by DMA (CPU).
(6) DMA destination address setting register DH (NBDMDH)
NBDMDH register specifies a DMA destination address.
It can be written from the NBD tool and read by DMA (CPU).
It can be read only in 16-bit units.
14
0
13
0
12
0
2
AD18
3
AD19
4
AD20
5
AD21
6
AD22
7
AD23
8
AD24
9
AD25
10
AD26
11
AD27
15
IR
1
AD17
0
AD16
NBDMDH
Address
FFFFFA6AH
Initial value
Undefined
Bit Position
Bit Name
Function
15
IR
Shows read or write status when NBD accesses internal RAM of the V850E/IA1.
0: NBD is read accessing RAM
1: NBD is write accessing RAM
Remarks 1.
When writing RAM using the NBD tool, an address signal from the NBD tool can be read from
the NBDMDH register by DMA (CPU).
2.
When reading RAM using the NBD tool, the NBDL register value can be read from the NBDMDH
register by DMA (CPU).
Содержание V850E/IA1 mPD703116
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