title: In Keil's debug mode, how to stop on the line where an global variable was changed?
body: <p>I am using Keil to debug my code.
  A bug happens because a global variable was changed <strong>unexpectedly</strong>, so I am trying to <strong>find the line</strong> where the global variable was changed.
  But I've no idea how to set a breakpoint to do it in Keil and whether it is possible to do it.
  Anyone can help?</p>