在CW的帮助文档里边搜索c12002是，得到的信息是：
The compiler did not know which page register should be used for a far access. The compiler may use the DPAGE register implicitly.
To avoid this warning, compile this file with the correct page (-CpDPage,-CpEPage or -CpPPage) options set
tips:
Compile all your source files with the correct page options (-CpDPage, -CpEPage or -CpPPage)! This message does not occur for the large memory model. In this model, all far and default accesses are implemented by runtime routine calls, unless some page register options are present
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