You need to issue a PWM_ReadStatusRegister() API in your interrupt handler or you will loop forever because the interrupt cause is not cleared.
A tip: use isr_StartEx(YourHandler) API and code your own handler. So yyou do not need to fiddle around in the generated files. You can use
UART_PutString("Enter into Output:\r\n");
Always try to avoid lengthy / time consuming code in an interrrupt handler because this might stall your system. Your UART output will take ~20ms which is a very long time compared to an 80MHz CPU.