Texas Instruments TMS320C6201 Reference Manual page 426

Configuring the Interrupt Selector
13.4 Configuring the Interrupt Selector
13-10
The interrupt selector registers are meant to be configured once after reset dur-
ing initialization and before enabling interrupts.
Note:
Once the registers have been set, the interrupt flag register should be cleared
by the user after some delay to remove any spurious transitions caused by the
configuration.
You may reconfigure the interrupt selector during other times, but spurious inter-
rupt conditions may be detected by the CPU on the interrupts affected by the
modified fields. For example, if EXT_INT4 is low, EXT_INT5 is high, and INT9
is remapped from EXT_INT4 to EXT_INT5, the low-to-high transition on INT9
is recognized as an interrupt and sets IF9.