MON166: Error (Cannot Write Memory)

Information in this article applies to:

• MON166 All Versions

SYMPTOMS

When I try to debug my application with Monitor-166 I receive the following error message:

CANNOT WRITE TO ROM AREA AT ADDRESS 0AEFFFFH

Why is this error message displayed and what does it mean?

CAUSE

Most likely your application is larger than the available memory and when loaded it is overwriting the monitor data area. You can check this in the linker MAP file (typically this file has the extension *.M66). This file tells you the memory areas in use by your program. Verify that the monitor data area is not also being used by your application.

RESOLUTION

If your program is using the monitor data area, you have several alternatives:

• Reduce the memory requirements of your application.
• Increase the amount memory available on your target system.
• Reserve the monitor data area using the Linker RESERVE directive.
• Reconfigure the monitor to use a different area for its data space.

MORE INFORMATION

• µVision2 Getting Started User's Guide, Chapter 11. Using Monitor-166
• Refer to Monitor Configuration in the MON166 User's Guide.

Last Reviewed: Thursday, February 25, 2021