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µVISION DEBUGGER: Can't Set C Code Breakpoints Using Windows on a Mac

Information in this knowledgebase article applies to:

  • Keil MDK - All versions
  • C166 - All versions
  • C51 - All versions
  • C251 - All versions


Using the debugger, breakpoints do not set, nor is it possible to step through C code with µVision installed on a Windows VM (Parallels) running on a Mac.


The program object code is not being loaded into the debugger.

Parallels sets up the directory structure by default using the \\psf\ designation. For example, the Windows Documents folder would be: \\psf\Home\Documents. µVision expects the mapped drive (e.g. drive letter:\folder) format for loading object code into the debugger.

Parallels also uses the \\psf\ designation for Windows default folders in the left-hand navigation pane in Windows Explorer, so avoid starting a project from that pane.


Map a drive letter and folder path to folders that contains µVision and your µVision projects (e.g. Y:\Keil\Projects) and make sure you start µVision projects from the mapped drive folder.



  • Refer to LOAD in the µVision User's Guide.

Last Reviewed: Saturday, October 3, 2020

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