
CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
User’s Manual U12688EJ4V0UM00
173
6.3.7 DMA disable status register (DDIS)
This register holds the contents of the ENn bit of the DCHCn register during NMI input (n = 0 to 3). It is read-only,
in 8- or 1-bit units.
0
CH0
Address
FFFFF5D0H
After reset
00H
1
CH1
2
CH2
3
CH3
4
0
5
0
6
0
7
0
DDIS
Bit Position
Bit Name
Function
3 to 0
CHn
(n = 3 to 0)
NMI Interruption Status
Reflects the contents of the ENn bit of the DCHCn register during NMI input.
The contents of this register are held until the next NMI input or until the next
system reset.
6.3.8 DMA restart register (DRST)
This register is used to restart DMA transfer that was forcibly interrupted during NMI input. The RENn bit of this
register and the ENn bit of the DCHCn register are linked to each other (n = 0 to 3). After NMI is completed, the
DDIS register is referred to and the DMA channel that was interrupted is confirmed, then by setting the RENn bit in
the corresponding channel (1), DMA transfer can be restarted. The register can be read/written in 8- or 1-bit units.
0
REN0
Address
FFFFF5D2H
After reset
00H
1
REN1
2
REN2
3
REN3
4
0
5
0
6
0
7
0
DRST
Bit Position
Bit Name
Function
3 to 0
RENn
(n = 3 to 0)
Restart Enable
This sets DMA transfer enable/disable in DMA channel n. If DMA transfer is
completed in accordance with the terminal count, it is reset (0). It is also reset
(0) when DMA is forcibly terminated by NMI input or by setting of the INITn bit
(1) in the DCHCn register.
0: DMA transfer disabled.
1: DMA transfer enabled.
Содержание V850E/MS1 UPD703100
Страница 2: ...User s Manual U12688EJ4V0UM00 2 MEMO ...
Страница 6: ...User s Manual U12688EJ4V0UM00 6 MEMO ...
Страница 8: ...User s Manual U12688EJ4V0UM00 8 MEMO ...
Страница 12: ...User s Manual U12688EJ4V0UM00 12 MEMO ...
Страница 26: ...User s Manual U12688EJ4V0UM00 26 MEMO ...
Страница 68: ...User s Manual U12688EJ4V0UM00 68 MEMO ...
Страница 124: ...User s Manual U12688EJ4V0UM00 124 MEMO ...
Страница 198: ...User s Manual U12688EJ4V0UM00 198 MEMO ...
Страница 230: ...User s Manual U12688EJ4V0UM00 230 MEMO ...
Страница 422: ...User s Manual U12688EJ4V0UM00 422 MEMO ...