197
Chapter 6
DMA Functions (DMA Controller)
User’s Manual U16580EE3V1UD00
(4)
DMA mode control register (DMAMC)
The DMAMC register is an 8-bit register that controls the operation of the DMA channels.
This register can be read or written in 8-bit units.
Reset input clears this register to 00H.
Figure 6-4:
DMA Mode Control Register (DMAMC)
Caution:
Writing of the DE1 and DE0 bits is prohibited if the corresponding A/D converter is
operating.
(5)
DMA status register (DMAS)
The DMAS register is an 8-bit register that displays the transfer status of the DMA channels.
This register can be read or written in 8-bit units.
Reset input clears this register to 00H.
Figure 6-5:
DMA Status Register (DMAS)
Remark:
n = 0 to 7
After reset:
00H
R/W
Address:
DMAMC FFFFF330H
7
6
5
4
3
2
1
0
DMAMC
DE7
DE6
DE5
DE4
DE3
DE2
DE1
DE0
DEn
Control Bit of DMA Channel n
0
DMA transfer operation of channel n disabled
1
DMA transfer operation of channel n enabled
After reset:
00H
R/W
Address:
DMAMC FFFFF332H
7
6
5
4
3
2
1
0
DMAS
DMAS7
DMAS6
DMAS5
DMAS4
DMAS3
DMAS2
DMAS1
DMAS0
DMASn
Status Bit of DMA Channel n
0
DMA transfer of channel n is idle or in progress
1
DMA transfer of channel n is completed
•
The DMASn bit can be read and written, but it can only be cleared by writing 0 to it, and
it cannot be set by writing 1 to it.
•
Since the DMASn bit is not cleared by the DMAC, it has to be cleared by software
before DMA transfer is started.
Содержание V850E/PH2
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