SW500009 Microchip Technology, SW500009 Datasheet - Page 82

• Manufacturer Part Number: SW500009
• Description: HI-TECH FOR DSPIC/PIC24
• Manufacturer: Microchip Technology
• Type: Compilerr
• Series: PIC24 & DsPICr

Specifications of SW500009

• Supported Families: PIC24
• Core Architecture: PIC, DsPIC
• Software Edition: Standard
• Kit Contents: Software And Docs
• Tool Type: Compiler
• Mcu Supported Families: PIC24 MCUs And DsPIC DSCs
• Lead Free Status / RoHS Status: Not applicable / RoHS Compliant
• For Use With/related Products: DSPIC3X/PIC24
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 025; 778-1003; 778-1003

Mixing C and Assembler Code
3.11.2 #asm, #endasm and asm()
PIC instructions may also be directly embedded “in-line” into C code using the directives #asm,
#endasm or the statement asm().
are to be embedded into the assembly output of the code generator. The #asm and #endasm construct
is not syntactically part of the C program, and thus it does not obey normal C flow-of-control rules,
however you can easily include multiple instructions with this form of in-line assembly.
haves like a C statement, however each instruction must be encapsulated within an asm() statement.
cases, use only the asm("") form, which is a C statement and will correctly interact with all C
flow-of-control structures.
68
extern unsigned int add(unsigned a, unsigned b);
void main(void)
{
}
The #asm and #endasm directives are used to start and end a block of assembly instructions which
The asm() statement is used to embed a single assembler instruction. This form looks and be-
You should not use a #asm block within any C constructs such as if, while, do etc. In these
The following example shows both methods used:
unsigned int var;
void main(void)
{
#asm
#endasm
}
int a, result;
a = read_port();
result = add(5, a);
var = 1;
// like this...
bcf 0,3
rlf _var
rlf _var+1
// or like this
asm("bcf 0,3");
asm("rlf _var");
asm("rlf _var+1");
C Language Features