XC886/888CLM
Interrupt System
User’s Manual
5-32
V1.3, 2010-02
Interrupt System, V 1.0
5.6.4
Interrupt Priority Registers
Each interrupt source can be individually programmed to one of the four available priority
levels. Two pairs of interrupt priority registers are available to program the priority level
of each interrupt vector. The first pair of Interrupt Priority Registers are SFRs IP and IPH.
The second pair of Interrupt Priority Registers are SFRs IP1 and IPH1.
The corresponding bits in each pair of Interrupt Priority Registers select one of the four
priority levels shown in
Note: NMI always has the highest priority (above Level 3), it does not use the level
.
Table 5-3
Interrupt Priority Level Selection
IPH.x / IPH1.x
IP.x / IP1.x
Priority Level
0
0
Level 0 (lowest)
0
1
Level 1
1
0
Level 2
1
1
Level 3 (highest)
IP
Interrupt Priority Register
Reset Value: 00
H
7
6
5
4
3
2
1
0
0
PT2
PS
PT1
PX1
PT0
PX0
r
rw
rw
rw
rw
rw
rw
Field
Bits
Type Description
PX0
0
rw
Priority Level Low Bit for Interrupt Node XINTR0
PT0
1
rw
Priority Level Low Bit for Interrupt Node XINTR1
PX1
2
rw
Priority Level Low Bit for Interrupt Node XINTR2
PT1
3
rw
Priority Level Low Bit for Interrupt Node XINTR3
PS
4
rw
Priority Level Low Bit for Interrupt Node XINTR4
PT2
5
rw
Priority Level Low Bit for Interrupt Node XINTR5
0
7:6
r
Reserved
Returns 0 if read; should be written with 0.
*
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