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TC1784
Direct Memory Access Controller (DMA)
User´s Manual
11-61
V1.1, 2011-05
DMA, V3.03
The bits in the Transaction Request State Register indicates which DMA channel is
processing a request, and which DMA channel has hardware transaction requests
enabled.
DMA_TRSR
DMA Transaction Request State Register
(014
H
)
Reset Value: 0000 0000
H
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
HT
RE
17
HT
RE
16
HT
RE
15
HT
RE
14
HT
RE
13
HT
RE
12
HT
RE
11
HT
RE
10
HT
RE
07
HT
RE
06
HT
RE
05
HT
RE
04
HT
RE
03
HT
RE
02
HT
RE
01
HT
RE
00
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CH
17
CH
16
CH
15
CH
14
CH
13
CH
12
CH
11
CH
10
CH
07
CH
06
CH
05
CH
04
CH
03
CH
02
CH
01
CH
00
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
rh
Field
Bits
Type Description
CH0n
(n = 0-7)
n
rh
Transaction Request State of DMA Channel 0n
0
B
No DMA request is pending for channel 0n.
1
B
A DMA request is pending for channel 0n.
CH1n
(n = 0-7)
8+n
rh
Transaction Request State of DMA Channel 1n
0
B
No DMA request is pending for channel 1n.
1
B
A DMA request is pending for channel 1n.
HTRE0n
(n = 0-7)
16+n
rh
Hardware Transaction Request Enable State of DMA
Channel 0n
0
B
Hardware transaction request for DMA Channel
0n is disabled. An input DMA request will not
trigger the channel 0n.
1
B
Hardware transaction request for DMA Channel
0n is enabled. The transfers of a DMA transaction
are controlled by the corresponding channel
request line of the DMA requesting source.
HTRE0n is set to 0 when CHSR0n.TCOUNT is
decremented and CHSR0n.TCOUNT = 0. HTRE0n can
be enabled and disabled with HTREQ.ECH0n or
HTREQ.DCH0n.
Содержание TC1784
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