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Data Segment Prefix Program Objects Program onjects includes code generated for C programs functions by C51 compiler. Each function in a source module is assigned a separate code segment using the?PR?function_name?module_name naming convention. For example, for a function name send_char in file name uart.c will have a segment name of?PR?SEND_CHAR?UART. C51 compiler creates saperate segments for local variables that are declared within the body of a function.

Segment naming conventions for different memory models are given in following tables. Function segment naming convention Advanced C programming Function Parameters C51 make use of registers and memory locations for passing parameters. By default C function pass up to three parameters in registers and further parameters are passed in fixed memory locations. You can disable parameter passing in register using NOREGPARMS keyword. Parameters are passed in fixed memory location if parameter passing in register is disabled or if there are too many parameters to fit in registers. Parameter passing in registers C functions may pass parameter in registers and fixed memory locations. Following table gives an idea how registers are user for parameter passing.

Example parameter passing to functions Parameter passing in Fixed Memory Locations Parameters passed to assembly routines in fixed memory lcoation use segments named?function_name? An Unofficial Gamesalad Textbook Pdf. BYTE All except bit parameters are defined in this segment.?function_name?BIT Bit parameters are defined in this segment. All parameters are assigned in this space 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 parameters passing may be in internal data memory or external data memory depending upon the memory model used. Drivers Monitor Lg Flatron L194ws more. The SMALL memory model is the most efficient and uses internal data memory for parameter segment. The COMPACT and LARGE models use external data memory for the parameter passing segments. Fucntion Return Values Function return values are always passed using CPU registers.