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F280200 debugging issue

Hi, I am using F280200 with XDS100 debugger, Code Composer Studio Version: 5.1.0.08012 and found debugger is misbehaving i.e. one variable is not getting updated.

if(var_a){
var_b = 1;
}
Here var_a is zero, still program counter is going inside but not updating var_b to 1.

Also after several trial found error:

C28xx: Trouble Setting Breakpoint with the Action "Continue or Finish Stepping" at 0x3f7951: (Error -1066 @ 0x3F7951) Unable to set requested breakpoint in memory. Verify that the breakpoint address is in writable memory. (Emulation package 5.0.486.0)

var_a address is 0x0000820B@data
var_b address is 0x0000820D@data

map file
         name            origin    length      used     unused   attr    fill
  DRAML0                00008200   00000200  000000c8  00000138  RWIX
0000820b   _Enable_mppt

Am I missing any configuration. Please let me know if more information needed.