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Break point in Interrupt funtion of CCS7.0 can not hold PC point

HI

I need a break point in interrupt funtion to watch value , but look it be disable by something.

follew picture is my ccs7.0 runing . you can see "interrupt void sciaRxFifoIsr(void)" is runing . becuse "rdata"  's value is changing . that is proof PC can into "interrupt void sciaRxFifoIsr(void)" .

but , when I set break point in it .  program can not stop . I want debug there .

please tell me where need I set corrently ?