http://www.embeddedlearningcenter.com/scripts/tol.exe?SID,13586.16802.20040716&CONFIG,pc-freescale.txt&TEMPLATE,pc_main.ops&AREA,8&COURSE,24570

void main (void)
{
KBIER |= 0x5; /* Enable KBI0 and KBI2 IRQs */
EnableInterrupts;
/* main loop goes here */
}

interrupt 15 void MyFirstKeyboardInterrupt (void)
{
KBSCR |= 0x04; /* Ack this interrupt */
/* Do your stuff here */
}


void main (void)
{
KBIER |= 0x5; /* Enable KBI0 and KBI2 IRQs */
EnableInterrupts;
/* main loop goes here */
}


To simply test your Interrupt handing you can use the simulator and
write a handler to populate and process the Software Interrupt. Here is
the example;

interrupt 1 void MySoftwareInterrupt (void)
{
__asm ( "nop" ); /* Place your breakpoint here */
} 

/********************************************************************************************************/
#include "hidef.h"

#define COUNT 75 /* Interrupts per sec */
unsigned char cCounter=0x00; /* Interrupt Events Counter */

void main(void) {

CONFIG1 = 0x0B; /* COP dis, STOP En, LVI En @5v */
CONFIG2 = 0x03; /* SCI using Int Clk, Osc En @STOP */
DDRC = 0xFF; /* Configure PortC as Output */
PORTC = 0xFF; /* Initialize PortC */
TBCR = 0x04; /* Configure TimeBase Status & Control Reg
TBM OFF & interrupt enabled
Select Timebase Rate (Div 2^15)
@XTAL=4.9152MHz -> Freq=150Hz */
cCounter = COUNT; /* Initialize the Counter */
EnableInterrupts;
TBCR |= TBON /* Turn TBM on */
while(1);
}/* END main() */

interrupt 17 void TBM_ISR (void){
TBCR |= TACK; /* TimeBase Interrupt Acknowledge */
if( !(--cCounter) ){ /* If Counter is ZERO then */
PORTC = ~PORTC; /* Toggle LED */
cCounter = COUNT; /* Reinitialize the Counter */
}
}/* END TBM_ISR() */


/*******************************************************************/
EnableInterrupts;