PIT interrupts

Dear Members

Thanks for helping me about PIT interrupts. I am able to generate the 
interrupts. But I think I am unable to got to the address at 0x0500 
which is the address for external interrupts.

I am using the pragma for the interrupts. i tried to use the example 
for the sci interrupt in pdf AN2109. Instead of SCI i am using a PIT 
interrupt.
I have given the code below to generate the interrupt and the handler.
In the code below PIT_Int() is the interrupt handler.I have used a 
pragma interrupt on to go to external interrupts. Th ecode in the 
pragma section which is commented is the code which is given in sci 
interrupt example at AN2109. i tried to run this code but it gave me 
an error saying illegal pragma. i think that they have used the 
example in the diab compiler whereas i am using a code warrior 
compiler. is my code for the interrupt is write. I would really 
appreciate if anyone can have a look at this.


void PIT_Int()
{
   cout<<"Interrupt handler"<<endl;
if(USIU.PISCR.B.PS == 1)
 {
     pitctra1++;					// Increment 
PIT interrupt counter
     if(pitctra1==100)	
     {
     countera1 = countera1+100;
     MIOS1.MPWMSM2PULR.R = 100;		/* Set Duty Cycle to 25%*/
     MIOS1.MPWMSM2SCR.B.EN = 1;		/* Enable output on PWM2 */
	 USIU.PISCR.B.PS = 1;	    // Negate interrupt request
     flag1=1;	
	 pitctra1 = 0;
     }
     else
     {
     	
     }
 }
else
 {
    	
 }
}
#pragma interrupt on 
#pragma section code_type "IrqSect" ".abs.00000500" 

//#pragma interrupt Ext_Isr
//#pragma section IrqSect RX address=0x500
//#pragma use_section "IrqSect" Ext_Isr
//__declspec(section"IrqSect")  

void Ext_Isr()
{
#define LEVEL0 0x40000000
asm (" mtspr EID, r0 "); // Set MSR.RI – now recoverable
if (USIU.SIPEND.R&LEVEL0) // Check if IRQ is level 0
{
PIT_Int(); // Call PIT C interrupt handler
}
else
{
// Just return
}
asm (" mtspr NRI, r0 "); // Clear MSR.RI - now irrecoverable

};
#pragma interrupt off





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