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System Interface Unit (SIU)
MPC5553/MPC5554 Microcontroller Reference Manual,
Rev. 5
6-14
Freescale Semiconductor
corresponding DMA/interrupt request enable bit in SIU_DIRER. The IRQ flag bit remains set until cleared
by software or through the servicing of a DMA request. The IRQ flag bits are cleared by writing a 1 to the
bits. A write of 0 has no effect.
6.3.1.5
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 is
only one interrupt request from the SIU to the interrupt controller. The EIRE bits allow selection of which
external interrupt request flag bits cause assertion of the one interrupt request signal.
Address: Base + 0x0014
Access: Read / Write[16:31]
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
Address: Base + 0x0014
Access: Read / Write[16:31]
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
EIF15
EIF14
EIF13
EIF12
EIF11
EIF10
EIF9
EIF8
EIF7
EIF6
EIF5
EIF4
EIF3
EIF2
EIF1
EIF0
W
w1c
w1c
w1c
w1c
w1c
w1c
w1c
w1c
w1c
w1c
w1c
w1c
w1c
w1c
w1c
w1c
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-6. SIU External Interrupt Status Register (SIU_EISR)
Table 6-8. SIU_EISR Field Descriptions
Register Bit Range
Field Name
Function
0–15
Reserved.
16–31
EIFn
External interrupt request flag n. This bit is set when an edge-triggered event occurs
on the corresponding IRQ[n] input.
0 No edge-triggered event has occurred on the corresponding IRQ[n] input.
1 An edge-triggered event has occurred on the corresponding IRQ[n] input.
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