XC886/888CLM
Interrupt System
User’s Manual
5-25
V1.3, 2010-02
Interrupt System, V 1.0
5.6.3
Interrupt Flag Registers
The interrupt flags for the different interrupt sources are located in several Special
Function Registers (SFRs). In case of software and hardware access to a flag bit at the
same time, hardware will have higher priority.
IRCON0
Interrupt Request Register 0
Reset Value: 00
H
7
6
5
4
3
2
1
0
0
EXINT6
EXINT5
EXINT4
EXINT3
EXINT2
EXINT1
EXINT0
r
rwh
rwh
rwh
rwh
rwh
rwh
rwh
Field
Bits
Type Description
EXINTx
(x = 0 - 1)
1:0
rwh
Interrupt Flag for External Interrupt 0/1
This bit is set by hardware and can only be cleared
by software.
0
Interrupt event has not occurred.
1
Interrupt event has occurred.
These bits are set by corresponding active edge
event i.e. falling/rising/both. These flags are
‘dummy’ and has no effect on the respective
interrupt signal to core. Instead, the corresponding
TCON flag is the interrupt request to the core - it is
sufficient to poll and clear the TCON flag.
EXINTy
(y = 2 - 6)
6:2
rwh
Interrupt Flag for External Interrupt y
This bit is set by hardware and can only be cleared
by software.
0
Interrupt event has not occurred.
1
Interrupt event has occurred.
0
7
r
Reserved
Returns 0 if read; should be written with 0.
IRCON1
Interrupt Request Register 1
Reset Value: 00
H
7
6
5
4
3
2
1
0
0
CANSRC2 CANSRC1
ADCSR1
ADCSR0
RIR
TIR
EIR
r
rwh
rwh
rwh
rwh
rwh
rwh
rwh
*
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