BL51: Specifying CODE and XDATA Ranges

Information in this article applies to:

• C51 Version 6.01 and Later

QUESTION

Can I specify a range of XDATA or CODE space? If so, will the linker warn me if my program runs out of RAM or EPROM?

ANSWER

Yes. You may specify a range for the XDATA and CODE linker directives. For example:

BL51 myfile.obj &
     CODE (0-0x2000, 0x4000-0x8000) &
     XDATA (0-0x3FF)

Specifies that the linker may locate your program CODE anywhere in the ranges from 0000h to 2000h and from 4000h to 8000h. The linker may locate your program's XDATA variables anywhere from 0000h to 03FFh.

The XDATA and CODE ranges are generated from the µVision Options for Target - Target tab when you enter external memory devices.

The linker will warn you if your program CODE or XDATA exceeds the specified memory area size. For example:

*** ERROR L107: ADDRESS SPACE OVERFLOW
    SPACE:   CODE
    SEGMENT: ?CO?MAIN
    LENGTH:  8000H

MORE INFORMATION

• Refer to CODE in the BL51 User's Guide.
• Refer to XDATA in the BL51 User's Guide.

SEE ALSO

• C51: Version 6 Release Notes

Last Reviewed: Thursday, February 25, 2021