10-10
MC9328MX1 Reference Manual
MOTOROLA
Interrupt Controller (AITC)
10.4.3 Interrupt Enable Number Register
The Interrupt Enable Number Register (INTENNUM) provides hardware accelerated enabling of
interrupts. Any write to INTENNUM enables one interrupt source. For example, when the 6 LSBs =
000000, interrupt source 0 is enabled; when the 6 LSBs = 000001, interrupt source 1 is enabled, and so
forth. This register is decoded into a single hot mask that is logically ORed with the INTENABLEH and
the INTENABLEL registers.
This hardware mechanism removes the requirement for an atomic read/modify/write sequence to enable an
interrupt source. For example, to enable interrupts 10 and 20, the software performs two writes to the
AITC: first write 10, then write 20 to the INTENNUM register (the order of the writes is irrelevant to the
AITC).
This register is located on the ARM920T processor’s native bus, is accessible in 1 cycle, and can be
accessed only in supervisor mode. This register must be accessed only on word (32-bit) boundaries. This
register is self-clearing and therefore always reads back all 0s.
INTENNUM
Interrupt Enable Number Register
Addr
0x00223008
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
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
ENNUM
TYPE
r
r
r
r
r
r
r
r
r
r
slfclr
slfclr
slfclr
slfclr
slfclr
slfclr
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 10-6. Interrupt Enable Number Register Description
Name
Description
Settings
Reserved
Bits 31–6
Reserved—These bits are reserved and should read 0.
ENNUM
Bits 5–0
Interrupt Enable Number
—Enables/Disables the
interrupt source associated with this value.
0x00 = Enable interrupt source 0
0x01 = Enable interrupt source 1
...
0x3F = Enable interrupt source 63
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