The document defines a function called DelayMs that uses Timer0 to create delays in milliseconds. It initializes Timer0 to increment every 12,000 clock cycles, which at a clock speed of 12MHz equals 1ms. The main function blinks an LED by turning it on for 500ms, then off for 500ms in a continuous loop using the DelayMs function.

1. Code:
#include "LPC1768_Includes.h"
#define PRESCALE 12000 //12000 PCLK clock cycles to increment TC by 1
void initTimer0(void);
void DelayMs(unsigned int Ms)
{
T0TCR = 0x02; //Reset TImer
T0TCR = 0x01; //Enable Timer
while(T0TC<Ms); // wait until timer counter reaches the desired delay
T0TCR =0x00; //Disable timer
}
void main()
{
PINSEL4=0x00;
//initClocks(); //Initalize CPU & Peripheral Clocks @12MHz
//VPBDIV = 0x01; //Initalize CPU & Peripheral Clocks @12MHz
initTimer0(); //Initalize Timer0
FIO2DIR=0x000000FF;
while(1)
{
FIO2SET=0x000000FF;
DelayMs(500); //0.5 secs delay
FIO2CLR=0x000000FF;
DelayMs(500);
}
}
void initTimer0(void)
{
T0CTCR = 0x0;
T0PR =PRESCALE-1; //value in Decimal - Increment T0TC at every 12000 clock cycles
//Count begins from 0 hence subtracting 1. 12000 clock cycles @12MHz = 1 ms

2. T0TCR = 0x02; //Reset Timer
}
Adding timer register address to header file:
Output: