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CC2538: Interrupt driven UART Rx doesnot collect/store correct data,Meaning of <exception frame>

Part Number: CC2538

Following is the screenshot of debug window.

The code is based on sampleswitch by TI and the fucntionality i am trying to induce is to read data from uart1 (connected to a0 and a1 pins) upon interrupt ,store it in buffer in the ISR and then process this data later when ISR is executed.

Some problems I am facing are:

1. Garbage data in pBuffer.Sometimes it is just AAAAA... and sometimes, non human readable data.

2. The other issue is that I am not able to understand the meaning of <Exception Frame>.

Please Help. Thanks in advance