Programming Model
MOTOROLA
Interrupt Controller (AITC)
10-11
10.4.4 Interrupt Disable Number Register
The Interrupt Disable Number Register (INTDISNUM) provides hardware accelerated disabling of
interrupts. Any write to this register disables one interrupt source. When the 6 LSBs = 000000, then
interrupt source 0 is disabled; when the 6 LSBs = 000001, then interrupt source 1 is disabled, and so forth.
This register is decoded into a single hot mask that is inverted and logically ANDed with the
INTENABLEH and the INTENABLEL registers.
This hardware mechanism removes the requirement for an atomic read/modify/write sequence to disable
an interrupt source. To disable interrupts 10 and 20, the software performs two writes to the AITC: first
write 10, then write 20 to INTDISNUM 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.
INTDISNUM
Interrupt Disable Number Register
Addr
0x0022300C
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
DISNUM
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 10-7. Interrupt Disable Number Register Description
Name
Description
Settings
Reserved
Bits 31–6
Reserved—These bits are reserved and should read 0.
DISNUM
Bits 5–0
Interrupt Disable Number
—Enables/Disables the
interrupt source associated with this value.
0x00 = Disable interrupt source 0
0x01 = Disable interrupt source 1
...
0x3F = Disable interrupt source 63
Содержание DragonBall MC9328MX1
Страница 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Страница 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
Страница 116: ...3 30 MC9328MX1 Reference Manual MOTOROLA Memory Map ...
Страница 126: ...4 10 MC9328MX1 Reference Manual MOTOROLA ARM920T Processor ...
Страница 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
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