32-22
MC9328MX1 Reference Manual
MOTOROLA
GPIO Module and I/O Multiplexer (IOMUX)
32.5.9 Interrupt Status Registers
The Interrupt Status Registers indicate whether an interrupt has occurred. When an interrupt event occurs
and the corresponding bit in the Interrupt Mask Register (IMR) is set (interrupt is active), then the bit in
this register is set.
There are four distinct Interrupt Status Registers; each holds the data for one of the four GPIO ports (Port
A, Port B, Port C, and Port D).
ISR_A
ISR_B
ISR_C
ISR_D
Port A Interrupt Status Register
Port B Interrupt Status Register
Port C Interrupt Status Register
Port D Interrupt Status Register
Addr
0x0021C034
0x0021C134
0x0021C234
0x0021C334
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
ISR
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
ISR
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 32-18. Interrupt Status Register Description
Name
Description
Settings
ISR [i]
Bits 31
–
0
Interrupt Status
—Indicates whether the interrupt [i] has occurred
for this module. Write 1 to clear.
0 = Interrupt has not occurred
1 = Interrupt has occurred
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