XC886/888CLM
Interrupt System
User’s Manual
5-17
V1.3, 2010-02
Interrupt System, V 1.0
5.6
Interrupt Registers
Interrupt registers are used for interrupt node enable, external interrupt control, interrupt
flags and interrupt priority setting.
5.6.1
Interrupt Node Enable Registers
Each interrupt node can be individually enabled or disabled by setting or clearing the
corresponding bit in the interrupt enable registers IEN0 or IEN1. Register IEN0 also
contains the global interrupt masking bit (EA), which can be cleared to block all pending
interrupt requests at once.
The NMI interrupt vector is shared by a number of sources, each of which can be
enabled or disabled individually via register NMICON.
After reset, the enable bits in IEN0, IEN1 and NMICON are cleared to 0. This implies that
all interrupt sources are disabled by default.
IEN0
Interrupt Enable Register 0
Reset Value: 00
H
7
6
5
4
3
2
1
0
EA
0
ET2
ES
ET1
EX1
ET0
EX0
rw
r
rw
rw
rw
rw
rw
rw
Field
Bits
Type Description
EX0
0
rw
Interrupt Node XINTR0 Enable
0
XINTR0 is disabled
1
XINTR0 is enabled
ET0
1
rw
Interrupt Node XINTR1 Enable
0
XINTR1 is disabled
1
XINTR1 is enabled
EX1
2
rw
Interrupt Node XINTR2 Enable
0
XINTR2 is disabled
1
XINTR2 is enabled
ET1
3
rw
Interrupt Node XINTR3 Enable
0
XINTR3 is disabled
1
XINTR3 is enabled
*
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