If you run the Cx51 Compiler within µVision IDE, you do not need
any additional settings on your computer. If you want to run the Cx51
Compiler and utilities from the command prompt, you must manually
create the following environment variables.
Variable
Path
Description
PATH
\KEIL\C51\BIN
Path to the C51 and CX51 executable programs.
TMP
Path to use for temporary files generated by the
compiler. If the specified path does not exist, the compiler
generates an error and aborts compilation.
C51INC
\KEIL\C51\INC
Path to the folder for Cx51 include files.
C51LIB
\KEIL\C51\LIB
Path to the folder for Cx51 library files.
Environment variables are entered under Control Panel — System
— Advanced — Environment Variables.
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