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System Integration Unit (SIU)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
6-17
The following table describes the fields in the DMA interrupt request enable register:
6.3.1.6
DMA/Interrupt Request Select Register (SIU_DIRSR)
The SIU_DIRSR selects between a DMA or interrupt request for events on the IRQ[0]–IRQ[3] inputs. If
the IRQ flag bits are set in the external IRQ status register (SIU_EISR) and the DMA/interrupt request
enable register (SIU_DIRER), then the select bit in the DMA interrupt request select register
(SIU_DIRSR) determines whether a DMA or interrupt request is asserted.
The following table describes the fields of the request select register:
Table 6-12. SIU_DIRER Field Descriptions
Field
Description
0–15
Reserved
16–31
EIRE
n
External interrupt request enable
n.
Enables the assertion of the interrupt request from the SIU to the interrupt
controller when an edge-triggered event occurs on the IRQ[
n
] pin.
0 External interrupt request is disabled.
1 External interrupt request is enabled.
Address: Base + 0x001C
Access: R/W
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
0
0
0
0
0
0
DIRS
3
DIRS
2
DIRS
1
DIRS
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-7. DMA/Interrupt Request Select Register (SIU_DIRSR)
Table 6-13. SIU_DIRSR Field Descriptions
Field
Description
0–27
Reserved
28–31
DIRS
n
DMA interrupt request select
n.
Selects between a DMA transfer or external interrupt request when an
edge-triggered event occurs on the corresponding IRQ[
n
] pin.
0 Interrupt request is selected.
1 DMA request is selected.Reserved
Содержание MPC5566
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