MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
9-13
Both the DMA request input signal and this enable request flag must be asserted before a channel’s
hardware service request is accepted. The state of the eDMA enable request flag does
not
affect a channel
service request made explicitly through software or a linked channel request.
As a given channel completes the processing of its major iteration count, there is a flag in the transfer
control descriptor that may affect the ending state of the EDMA_ERQR bit for that channel. If the
TCD.D_REQ bit is set, then the corresponding EDMA_ERQR bit is cleared after the major loop is
complete, disabling the DMA hardware request. Otherwise if the D_REQ bit is cleared, the state of the
EDMA_ERQR bit is unaffected.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R ERQ
63
ERQ
62
ERQ
61
ERQ
60
ERQ
59
ERQ
58
ERQ
57
ERQ
56
ERQ
55
ERQ
54
ERQ
53
ERQ
52
ERQ
51
ERQ
50
ERQ
49
ERQ
48
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0008
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R ERQ
47
ERQ
46
ERQ
45
ERQ
44
ERQ
43
ERQ
42
ERQ
41
ERQ
40
ERQ
39
ERQ
38
ERQ
37
ERQ
36
ERQ
35
ERQ
34
ERQ
33
ERQ
32
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0008
Figure 9-4. eDMA Enable Request High Register (EDMA_ERQRH)—MPC5554 Only
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R ERQ
31
ERQ
30
ERQ
29
ERQ
28
ERQ
27
ERQ
26
ERQ
25
ERQ
24
ERQ
23
ERQ
22
ERQ
21
ERQ
20
ERQ
19
ERQ
18
ERQ
17
ERQ
16
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x000C
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R ERQ
15
ERQ
14
ERQ
13
ERQ
12
ERQ
11
ERQ
10
ERQ
09
ERQ
08
ERQ
07
ERQ
06
ERQ
05
ERQ
04
ERQ
03
ERQ
02
ERQ
01
ERQ
00
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x000C
Figure 9-5. eDMA Enable Request Low Register (EDMA_ERQRL)
Table 9-4. EDMA_ERQRH, EDMA_ERQRL Field Descriptions
Bits
Name
Description
0–31
ERQn
Enable DMA hardware service request n.
0 The DMA request signal for channel n is disabled.
1 The DMA request signal for channel n is enabled.
Содержание MPC5553
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