System Integration Unit (SIU)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
6-16
Freescale Semiconductor
Preliminary
6.3.2.5
DMA/Interrupt Request Enable Register (SIU_DIRER)
The SIU_DIRER allows the assertion of a DMA or interrupt request if the corresponding flag bit is set in
the SIU_EISR. The external interrupt request enable bits enable the interrupt or DMA request. There are
five interrupt requests from the SIU to the interrupt controller: IRQ0, IRQ1, IRQ2, IRQ3, and IRQ4, plus
IRQ5 to IRQ15 on one interrupt request. The EIRE bits allow selection of which external interrupt request
flag bits cause assertion of the one interrupt request signal for IRQ5 to IRQ15.
6.3.2.6
DMA/Interrupt Request Select Register (SIU_DIRSR)
The SIU_DIRSR allows selection between a DMA or interrupt request for events on the IRQ4–IRQ1
inputs. The SIU_DIRSR selects between DMA and interrupt requests. If the corresponding bits are set in
SIU_EISR and the SIU_DIRER, then the DMA/interrupt request select bit determines whether a DMA or
interrupt request is asserted.
Table 6-7. SIU_EISR Field Descriptions
Field
Description
NMIn
Non Maskable Interrupt Flag for primary CPU (Z1) or secondary CPU (Z0). NMI0 is for the primary core. NMI1 is for
the secondary core. This bit is set when an edge-triggered event occurs on the corresponding NMIn input.
0 No edge-triggered event occurred on the corresponding NMIn input.
1 An edge-triggered event occurred on the corresponding NMIn input.
bits 2–15 Reserved
EIFn
External Interrupt Request Flag n. Set when an edge-triggered event occurs on the corresponding IRQn input.
0 No edge triggered event occurred on the corresponding IRQn input.
1 An edge triggered event occurred on the corresponding IRQn input.
Offset:
SI 0x0018
Access: User read/write
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 EIRE
15
EIRE
14
EIRE
13
EIRE
12
EIRE
11
EIRE
10
EIRE9 EIRE8 EIRE7 EIRE6 EIRE5 EIRE4 EIRE3 EIRE2 EIRE1 EIRE0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-6. SIU DMA/Interrupt Request Enable Register (SIU_DIRER)
Table 6-8. SIU_DIRER Field Descriptions
Field
Description
bits 0–15 Reserved.
EIREn
External Interrupt Request Enable n. Enables assertion of the interrupt request from the SIU to the interrupt
controller when an edge triggered event occurs on the IRQn pin.
0 External interrupt request disabled.
1 External interrupt request enabled.