Not working

in the simulation program running smoothly, but when the diwnload to the target is not working as it should. .

The following source code

#include <LPC214x.H>

void delay(unsigned int lama)
{ /* My PCLK of Timer0 is 12Mhz */
unsigned int d;
for(d=0;d<lama;d++){
T0PR = 9999; // Prescale Register = 9999
T0MR0 = 1200; // Match Register = 900
T0MCR = 0x00000004; // Stop on MR0: the TC and PC will be stopped // and TCR[0] will be set to 0 if MR0 matches the TC.
T0TCR = 0x02; // Counter Reset
T0TCR = 0x01; // Counter Enable
while(T0TC != T0MR0);
T0TC = 0; // TC kembali ke 0
} }

void delay_ms(unsigned int lama_1)
{ /* My PCLK of Timer0 is 12Mhz */
unsigned int d;
for(d=0;d<lama_1;d++){
T0PR = 999; // Prescale Register = 9999
T0MR0 = 12; // Match Register = 900
T0MCR = 0x00000004; // Stop on MR0: the TC and PC will be stopped // and TCR[0] will be set to 0 if MR0 matches the TC.
T0TCR = 0x02; // Counter Reset
T0TCR = 0x01; // Counter Enable
while(T0TC != T0MR0);
T0TC = 0; // TC kembali ke 0
}

}

void delay_ns(unsigned int lama_2)
{ /* My PCLK of Timer0 is 12Mhz */
unsigned int d;
for(d=0;d<lama_2;d++){
T0PR = 1; // Prescale Register = 9999
T0MR0 = 12; // Match Register = 900
T0MCR = 0x00000004; // Stop on MR0: the TC and PC will be stopped // and TCR[0] will be set to 0 if MR0 matches the TC.
T0TCR = 0x02; // Counter Reset
T0TCR = 0x01; // Counter Enable
while(T0TC != T0MR0);
T0TC = 0; // TC kembali ke 0
}

}

int main(void)
{

unsigned int i;
IODIR1 = 0x00FF0000; // set all ports to output

while(1)
{

for(i=0;i<4;i++){
IOSET1 = 0x00010000; //set output pins
delay_ns(200);
IOCLR1 = 0x00010000; //clear output pins
delay_ns(200);
}

delay_ns(19800);

}
}

please enlightenment?!