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CCS/TM4C1231H6PZ: Question on Debugger question on tm4c1231h6pz and tm4c1231h6pm

Part Number: TM4C1231H6PZ
Other Parts Discussed in Thread: TM4C1231H6PM

Tool/software: Code Composer Studio

Hi all, I have a project targeting tm4c1231h6pm processor, the debugger works fine and it stops at the main () after it is launched. However when I moved my project to a similar board that uses tm4c1231h6pz processor, the debugger don't stop at main () but show that the target is running, it doesn't give me any warning or error though during the launching process. Anyone has an idea? Is there any setting that I need to change to move to tm4c1231h6pz from tm4c1231h6pm?

Here is my settings:

Again, it works well with tm4c1231h6pm. I tried to change Connection Option to "Halt target on a connect", but it is greyed out and disallow me to select it. Does anyone know how I can make this change?

Thank you very much for any help!