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Environment Settings

If you run the Ax51 Assembler within the µVision IDE, you require no additional settings on your computer. To run the assembler from the command prompt, you must manually create the following environment variables.

Variable Path Description
PATH \KEIL\C51\BIN Path to the executable programs.
TMP   Path to use for temporary files generated by the assembler. If the specified path does not exist, the assembler generates an error and aborts.
C51INC \KEIL\C51\INC Path to the folder for C51 include files.

Environment variables are entered under Control Panel — System — Advanced — Environment Variables.

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