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BL51 User's Guide
BL51 Introduction Linking Programs 
Locating Segments Classic 8051 Devices 
Standard Application Example Code Banking Example Using Wildcards Using a Target Monitor Data Overlaying Code Banking Real-Time Programs Error MessagesUsing Wildcards
The BL51 Linker allows you to specify wildcards in segment names you specify in the BIT, CODE, DATA, IDATA, PDATA, PRECEDE, STACK, and vXDATA directives. An obvious benefit of wildcards is the ability to locate all segments from a single source module without specifying every individual segment name. For example
BL51 myfile.obj CODE (?PR?*?myfile (0x1000))
There are numerous situations where wildcards are useful. For example, you may use wildcards to locate groups of segments into a 2 KByte block. Then, you may use ACALL and AJMP instructions (rather than LCALL and LJMP) for function calls within this group.
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