Difference between PCH / PCM / PCB

Guest · Posted: Tue Jan 06, 2009 3:58 am

Hi,

What is the difference between using of PCH / PCM / PCB as below (if defined(__PCH__)),
What happens if we did not mention it ?

andyfraser · Joined: 04 May 2004 Posts: 47 Location: UK

Hi,

These are automatically defined by the compiler so as to include the correct code for the series of PIC the compiler is designed for. You do not need to declare these yourself.

HTH

Andy

dyeatman · Joined: 06 Sep 2003 Posts: 1924 Location: Norman, OK

The line "#if defined(__PCH__)" is known as a conditional and is used to include/exclude portions of code based on which compiler is being used. In this case the section of code will only be included if you are using the PCH compiler otherwise it will be ignored. As Andy said, the compiler automatically defines the appropriate one based on which compiler it is.

For example, since 16F and 18F chips have different requirements, CCS uses the conditionals so one example can be used with the different CCS compilers.