Rainbow Electronics W90N740 User Manual
Page 183
W90N740
Publication Release Date: November 26, 2004
- 179 -
Revision A4
AIC IRQ Priority Encoding Register (AIC_IPER)
Register Address
R/W
Description
Reset
Value
AIC_IPER 0xFFF8.210C
R
Interrupt Priority Encoding Register
0x0000.0000
31
30
29
28
27
26
25
24
0 0 0 0 0 0 0 0
23
22
21
20
19
18
17
16
0 0 0 0 0 0 0 0
15
14
13
12
11
10
9
8
0 0 0 0 0 0 0 0
7
6
5
4
3
2
1
0
RESERVED
VECTOR 0
0
When the AIC generates the interrupt, VECTOR represents the interrupt channel number that is active,
enabled, and has the highest priority. If the representing interrupt channel possesses a priority level 0,
then the interrupt asserted is FIQ; otherwise, it is IRQ. The value of VECTOR is copied to the register
AIC_ISNR thereafter by the AIC. This register was restored a value 0 after it was read by the interrupt
handler. This register can help indexing into a branch table to quickly jump to the corresponding interrupt
service routine.
VECTOR [6:2]: Interrupt Vector
0 = no interrupt occurs
1 ~ 31 = representing the interrupt channel that is active, enabled, and having the highest priority