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Some RX MCU peripherals use only fixed interrupt vectors, while some others also use software configurable interrupt vectors.
The software configurable interrupt vectors can configure which interrupt is enabled by the user depending on the application.
And, the two kinds of software configurable interrupt setting is available, it separates as the using source clock these are PCLKA and PCLCB.

How to set the software configurable interrupt depends on the driver you are using.

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