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C251 User's Guide
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Appendix
C251 User's Guide
Passing in Memory
Parameters passed to assembly routines in fixed memory locations use segments named ?function_name?BYTE and ?function_name?BIT to hold the parameter values passed to the function function_name.
Bit parameters are copied into the ?function_name?BIT segment prior to calling the function. All other parameters are copied into the ?function_name?BYTE segment.
All parameters are assigned space in these segments even if they are passed using registers. Parameters are stored in the order in which they are declared in each respective segment.
The fixed memory locations used for parameter passing may be in memory class DATA, EDATA, or XDATA depending upon the memory model used.
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