Lpc2000

Hi all,
        I am newbie to this  field .Can you please help me to come out of 
this problem.

        I modify the pgm, to generate the 100KHz frequency with 50% duty 
cycle  in Timer1 Match 1.1 pin(P0.13 pin)

The modified program is generate correct frequency in polling method 
only.It didnt generate the frequency (50% duty cycle) While performing 
other tasks.

I want to generate the frequency(50% duty cycle),with out polling method.

Give me some ideas,to generate the 100KHz frequency(50% duty cycle) in any 
method.

Herewith this i  enclosed my program.

#include <LPC210x.H> 

void T0isr(void)        __irq;

void main(void)
{
        VPBDIV = 0x00000000;            // Configure the  VPB divi
        PINSEL0 |= 0x08000000;          //Match1 as output      (P0.13)
        T1PR = 0;                                       //Load prescaler
        T1TCR = 0x00000002;                     //Reset timer
        T1MR1 = 0x00000048;                     // Set the on or off time 
of cycle 
        T1MCR = 0x00000018;                     //Reset on MR1 & interrupt 
On MR1
 
        VICVectAddr4 = (unsigned)T0isr; //Set the timer ISR vector address
        VICVectCntl4 = 0x00000025;      //Set channel
        VICIntEnable |= 0x0000020;      //Enable the interrupt
        T1TCR           = 0x00000001;   //enable timer
        while (1)
        {
                ;
        }
}

void T0isr (void)       __irq
{
        T1EMR |= 0x000000C2;            /Toggle MAT1 pin
        T1IR |= 0x00000002;             //Clear match 1 interrupt
        VICVectAddr = 0x00000000;       //Dummy write to signal end of 
interrupt
}


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