Designer Reference Manual USB08 Evaluation Board
58 Software Module Descriptions MOTOROLA
Software Module Descriptio ns
because this application does not use problematic con structions, li ke bit
fields in the source code.
In some places, using individual assembler instructions in the form of
in-line assembler directives is considered useful, for example, for the
interrupt enable in the main module U08MAIN.C. For this purpose, the
Cosmic C Compiler offers the following instruction:
_asm("<assembly statement >");
When using other compilers, similar instructions should be available.
However, some small syntactic adjustments can be necessary. Beside
the main module, the modules U08232.C and U08ADC.C also contain
such in-line assembler constructions.
The marking of a function as an interrupt service routine is not regulated
in the ANSI-C standard. For lack of a uniform regulation, the different
compilers handle this necessary marking in a different way. For
example, the Cosmic C Compiler uses the modification @interrupt:
@interrupt void interrupt_handler();
Other compilers use “#pragma” instructions to mark interrupt functions.