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Interrupt Controller (INTC)
Chapter 5
Preliminary User’s Manual U17566EE1V2UM00
The NMI and INTP0 share the same pin. The register bits NMIEN, ESEL0,
ESEL01 and ESEL00 configure the NMI and INTP0 interrupt function:
Caution
The NMI configuration bits INTM0.NMIEN and INTM0.ESEL0[1:0] can only be
changed if INTM0.NMIEN = 0.
Due to INTM0.NMIEN = 0 after reset the NMI function is disabled and must be
enabled by the application software. Once enabled, the NMI function cannot be
disabled by software.
Specify INTM0.ESEL0[1:0] before or at the same time with setting
INTM0.NMIEN = 1.
Note that INTM0.ESEL0 can be written independently of INTM0.NMIEN.
NMIEN
ESEL0
ESEL01
ESEL00
Function
NMI
INTP0
0
0
0
0
masked
falling edge
0
0
1
rising edge
0
1
0
prohibited
0
1
1
both edges
1
0
0
low level
1
0
1
high level
1
1
0
low level
1
1
1
high level
1
0
0
0
falling edge
falling edge
0
0
1
rising edge
rising edge
0
1
0
prohibited
prohibited
0
1
1
both edges
both edges
1
0
0
falling edge
low level
1
0
1
rising edge
high level
1
1
0
prohibited
low level
1
1
1
both edges
high level
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