XC886/888CLM
Interrupt System
User’s Manual
5-10
V1.3, 2010-02
Interrupt System, V 1.0
where the pending interrupt request is cleared directly by resetting the node’s interrupt
status flags. If IMODE = 0, only on clearing the interrupt node enable bit will indirectly
clear its pending interrupt request.
Hence when IMODE = 0, the interrupt node enable bit additionally serves a dual function:
to enable/disable the generation of pending interrupt request, and to clear an already
generated pending interrupt request (by resetting enable bit to 0).
Note: Interrupt structure 2 applies to the NMI, with the exclusion of EA bit and ‘interrupt
node enable bit’ is replaced by OR of all NMICON bits. Therefore, NMI node is
non-maskable when IMODE = 1; whereas NMI pending interrupt request may be
cleared by clearing all NMICON bits when IMODE = 0
5.1.2.1
System Control Register 0
The SYSCON0 register contains bits to select the SFR mapping and interrupt structure
2 mode.
Note: The IMODE bit should be cleared/set using ANL or ORL instructions.
SYSCON0
System Control Register 0
Reset Value: 04
H
7
6
5
4
3
2
1
0
0
IMODE
0
1
0
RMAP
r
rw
r
r
r
rw
Field
Bits
Type Description
IMODE
4
rw
Interrupt Structure 2 Mode Select
0
Interrupt structure 2 mode 0 is selected.
1
Interrupt structure 2 mode 1 is selected.
1
2
r
Reserved
Returns 1 if read; should be written with 0.
0
1, 3
[7:5]
r
Reserved
Returns 0 if read; should be written with 0.
*
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