SW500010 Microchip Technology, SW500010 Datasheet - Page 90

• Manufacturer Part Number: SW500010
• Description: HI-TECH C PRO FOR PIC10/12/16
• Manufacturer: Microchip Technology
• Type: Compilerr
• Series: PIC10/12/16r

Specifications of SW500010

• Supported Families: PIC10, PIC12, PIC16
• Core Architecture: PIC
• Software Edition: Professional
• Kit Contents: Software And Docs
• Mcu Supported Families: PIC10/12/16
• Tool Type: Compiler
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: PIC10, PIC12, PIC14, PIC16, PIC16E
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 019P; 778-1006; 778-1006

Functions
location encapsulated in a RETLW instructions which can be called and which return with the value
in WREG.
Section 3.3.12.
3.5 Functions
3.5.1 Function Argument Passing
The method used to pass function arguments depends on the size of the argument or arguments.
area of the called function. If there are subsequent arguments, these arguments are also passed in the
argument area of the called function. The argument area is referenced by an offset from the symbol
?_function, where function is the name of the function concerned.
W register, with subsequent arguments being passed in the argument area of the called function.
The function test() will receive the parameter b in its function argument block and a in the W register.
A call:
would generate code similar to:
In this example, the parameter b is held in the memory locations ?_test and ?_test+1.
function or the code used to call a function, it is often helpful to write a dummy C function with the
same argument types as your assembler function, compile this, and then inspect the assembly list
file (PICC --ASMLIST option), allowing you to examine the assembly code.
90
All const-qualified data objects and string literals are placed in the strings psect. See also
If there is only one argument, and it is one byte in size, it is passed in the W register.
If there is only one argument, and it is greater than one byte in size, it is passed in the argument
If there is more than one argument, and the first argument is one byte in size, it is passed in the
Take, for example, the following ANSI-style function:
If you need to determine, for assembly code for example, the exact entry or exit code within a
void test(char a, int b)
{
}
test( a, 8);
movlw 08h
movwf ?_test
clrf
movf
call (_test)
?_test+1
_a,w
C Language Features