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You can go through this example CE: http://www.cypress.com/documentation/code-examples/ce210558-psoc-4-gpio-interrupt.
In your case "FAULT_ClearInterrupt()" should clear the interrupt flag and return the right-shifted current value of the interrupt status register. The bit location that is "1" int the returned value indicated the pin which caused the interrupt. Please go through the example code for more details.