SW500010 Microchip Technology, SW500010 Datasheet - Page 98

• 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

Interrupt Handling in C
parameters. This is the only function prototype that makes sense for an interrupt function.
interrupt functions may not be called directly from C code (due to the different return instruc-
tion that is used), but they may call other functions itself.
3.9.1.1 Midrange Interrupt Functions
An example of an interrupt function for a midrange PIC processor is shown here.
As there is a maximum of one interrupt vector in the midrange PIC series, only one interrupt
function may be defined. The interrupt vector will automatically be set to point to this function.
3.9.1.2 Context Saving on Interrupts
The PIC processor only saves the PC on its stack whenever an interrupt occurs. Other registers
and objects must be saved in software. The HI-TECH C PRO for the PIC10/12/16 MCU Family
compiler determines which registers and objects are used by an interrupt function and saves these
appropriately.
code in the same module, then any registers used by these functions will be saved as well.
in-line within the interrupt function for register usage. Thus, if you include in-line assembly code
into an interrupt function, you may have to add extra assembly code to save and restore any registers
or locations used. The same is true for any assembly routines called by the interrupt code.
3.9.1.3 Midrange Context Saving
The code associated with interrupt functions that do not require registers or objects is placed directly
at the interrupt vector in a psect called intcode.
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An interrupt function must be declared as type void interrupt and may not have
If the interrupt routine calls other functions and these functions are defined before the interrupt
HI-TECH C PRO for the PIC10/12/16 MCU Family does not scan assembly code which is placed
int tick_count;
void interrupt tc_int(void)
{
}
if (T0IE && T0IF) {
}
T0IF=0;
++tick_count;
C Language Features