9-22
MB86R02 ‘Jade-D’ Hardware Manual V1.64
9.5.9 Interrupt vector register (VCT)
When it is assert (The IRQF bit of the IRQF register sets it to "1"), IRQ displays the interrupt vector
table to the interrupt source that should be processed in the ARM core as for the VCT register.
The priority of vector address is as follows.
•
In the source where the IRQ interrupt occurs, the priority of the interrupt source vector of the
high level rises most.
•
The address offset value rises the priority when the interrupt transmission source at this level
is caused at the same time and the small rises.
I
Address
IRC0:
FFFF_FE00
H
or FFFE_8000
H
+ 20
H
IRC1: FFFB_0000
H
+ 20
H
IRC2: FFFB_1000
H
+ 20
H
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Name
VCT31 VCT30 VCT29 VCT28 VCT27 VCT26 VCT25 VCT24 VCT23 VCT22 VCT21 VCT20 VCT19 VCT18 VCT17 VCT16
R/W
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Initial value
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
VCT15 VCT14 VCT13 VCT12 VCT11 VCT10 VCT9
VCT8 VCT7
VCT6 VCT5
VCT4
VCT3
VCT2
VCT1
VCT0
R/W
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Initial value
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Bit field
Explanation
Number
Name
31-0
VCT31-0
Display the interrupt vector table to the interrupt source that should be processed.
The displayed vector value is a value that the offset value of each interrupt factor was added to
the upper address value set depending on the TBR register.
Refer to "
Table 9-2 Expansion IRQ interrupt vectors of IRC0
" and "
Table 9-3
Expansion IRQ interrupt vector of IRC1
" for the relation among the interrupt source,
the interrupt level register, and the vector address.
The initial value of these bits is undefined.
After the IRQF bit of the RQF register is set to "1", the displayed vector address value is not changed
until the IRQF bit is cleared. The interrupt level is decided again after the IRQF bit is cleared, and the
display is updated by the source that sets the IRQF bit. When "1" is not set to the IRQF bit, the
register value is not defined.
The firmware diverges to the address specified for the VCT register (It is divergent to the expansion
vector table) by the instruction put on IRQ vector (0000_0018
H
). It diverges to the interrupt handler by
the instruction continuously put in the address. It can know whether a new IRQ source is higher than
a current interrupt among interrupt handlers when the IRQF bit is cleared once after it diverges to the
interrupt handler by the assert of IRQ.
Содержание MB86R02
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