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TC1784
Direct Memory Access Controller (DMA)
User´s Manual
11-15
V1.1, 2011-05
DMA, V3.03
Figure 11-8 Hardware-controlled Single Mode Operation
(m = 0-1)
Hardware-controlled Continuous Mode
In hardware-controlled Continuous Mode (CHCRmn.CHMODE = 1), the hardware
transaction request enable bit HTREmn is not reset at the end of a DMA transaction. A
new transaction of DMA channel mn with the parameters actually stored in the channel
register set of DMA channel mn is started each time when CHSRmn.TCOUNT = 0 at the
end of the DMA transaction. No software re-enable for a hardware request at
CHmn_REQ is required.
MCT06156
tc = initial transfer count
tc = initial transfer count
CHCRmn.RROAT = 1
CHCRmn.RROAT = 0
TR0 TR1
TRn
tc-1
TR0 TR1
0
tc
tc-1
0
1
tc
TR0
tc-1
tc
TR1
TRn-1
TRn
0
0
2
1
tc
TR0
TRSR.HTREmn
CHmn_REQ
INT
(triggered at the end
of a transaction with
IRDV=0)
CHSRmn.TCOUNT
DMA Transfer mn
TRSR.CHmn
TRSR.HTREmn
CHmn_REQ
TRSR.CHmn
DMA Transfer mn
CHSRmn.TCOUNT
INT
(triggered at the end
of a transaction with
IRDV=0)
Содержание TC1784
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