Programming Model
MOTOROLA
Interrupt Controller (AITC)
10-25
10.4.9 Fast Interrupt Vector and Status Register
The Fast Interrupt Vector and Status Register (FIVECSR) specifies the priority of the highest pending fast
interrupt and provides the vector index for the interrupt’s service routine. This hardware mechanism
removes the requirement for ARM920T processor support of the FF1 command. This number can be
directly used as an index into a vector table to select the highest pending fast interrupt source.
This read-only 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.
FIVECSR
Fast Interrupt Vector and Status Register
Addr
0x00223044
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
FIVECTOR [31:16]
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0xFFFF
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
FIVECTOR [15:0]
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0xFFFF
Table 10-21. Fast Interrupt Vector and Status Register Description
Name
Description
Settings
FIVECTOR
Bits 31–0
Fast Interrupt Vector
—Indicates vector index
for the highest pending fast interrupt.
0 = Interrupt 0 is highest pending fast interrupt
1 = Interrupt 1 is highest pending fast interrupt
...
63 = Interrupt 63 is highest pending fast interrupt
64+ = not used, does not occur
Содержание DragonBall MC9328MX1
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