Programming Model
MOTOROLA
GPIO Module and I/O Multiplexer (IOMUX)
32-21
32.5.8 Interrupt Mask Registers
The Interrupt Mask Registers determine whether an interrupt is active. When an interrupt event occurs and
the bit in this register is set (active), then the corresponding bit in the Interrupt Status Register (ISR) is set.
There are four distinct Interrupt Mask Registers; each holds the data for one of the four GPIO ports (Port
A, Port B, Port C, and Port D).
IMR_A
IMR_B
IMR_C
IMR_D
Port A Interrupt Mask Register
Port B Interrupt Mask Register
Port C Interrupt Mask Register
Port D Interrupt Mask Register
Addr
0x0021C030
0x0021C130
0x0021C230
0x0021C330
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
IMR
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
IMR
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 32-17. Interrupt Mask Register Description
Name
Description
Settings
IMR [i]
Bits 31
–
0
Interrupt Mask
—Masks the interrupts for this module.
0 = Interrupt is masked
1 = Interrupt is not masked
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