Preprocessor Directive In some languages, such as C/C++, compiler directives as in the above examples are called preprocessor directives because they are handled before the actual compilation process.

Macros are part of the preprocessor for the C/C++ languages which manipulates the source code before the actual translation to machine code. But there are risks when macros generate source code.

With the latest SDK, you can select a 200 MHz clock using preprocessor directives as "#define SYS_CLK_MHZ 200". The regulator voltage may increase if required. The release notes also tease ...