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When defining processor interrupt pin INT_I0 in an OpenBus System, there is an additional entry that can be chosen – Internal – what is this?

April 26, 2017additional chosen defining interrupt openbus Pin processor system

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When defining processor interrupt pin INT_I0 in an OpenBus System, there is an additional entry that can be chosen – Internal – what is this?

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This allows for the situation where the INT_I0 line of the processor is actually the logical OR of the interrupt generated by a Programmable Interval Timer, internal to the processor, and the interrupt line zero. Provided the interrupt is not assigned to an OpenBus peripheral, the Internal entry will be available. When this option is used, the interrupt pin will not be exported for use outside the OpenBus System. Note however, that precedence is given to use of the interrupt line by an OpenBus peripheral. If you have set the Internal option for the pin, then subsequently assign INT_I0 for a peripheral’s interrupt line, the setting will automatically be changed to Exported (as output pin).