here's the code i had written in C. can u tell me what modifications i need to do to make step delay and counting a timer 0 interrupt

/*main.c*/
#include <reg51xa.h>
#include <stdio.h>
#include <stdlib.h>
sbit target=P3^2; /*set pin 3.2 as target */
sbit notA=P2^0; /*set pin 1.0 as output */
sbit isA=P2^1; /*set pin 1.1 as output */
sbit notB=P2^2; /*set pin 1.2 as output */
sbit isB=P2^3; /*set pin 1.3 as output */
char step[]={12,6,3,9};/*load the step sequence*/
char binbuf2,binbuf3,binbuf4,direction;
int y=1;int i;
int dir;
long int st=0; /*initialise step count */
int t=0;int z=1;
void sendserial(unsigned char);/*function for serial communication*/

void convert(); /*function for conversion */
void delay(); /*function for delay */
void delay(){
int g, h;
for(g=0; g<5000; g++)
for(h=0; h<5000; h++)
g=g+1;
}
void main()
{

TMOD = 0x20; /* configure timer for the correct baud rate */
TH1 = 0xe6; /* 1200 bps for 12 MHz clock */
TCON = 0x00; /* Set timer to not running */
SCON = 0x50; /* Set Serial IO to receive and normal mode */
TR1 = 1; /* start timer to Receive */




/* clockwise movement */
st=0;
direction='C';
ACC=direction;
sendserial(ACC);
i = 0;
while(st!=100) {
P2=step[i];
delay();
i++;
if(i == 4)
i = 0;
st=st+1;
if(target == 1){
t=t+1;
ACC=st;
convert();
sendserial(binbuf4);
sendserial(binbuf3);
sendserial(binbuf2);
if(t==2) /* if no. of pulses = 2 */
{
ACC=t;
convert();
sendserial(binbuf4);
sendserial(binbuf3);
sendserial(binbuf2);
}
if(t==6) /* if no. of pulses = 6 */
{
ACC=t;
convert();
sendserial(binbuf4);
sendserial(binbuf3);
sendserial(binbuf2);
}
}
}

/* counter clockwise movement */
direction='A';
ACC=direction;
sendserial(ACC);
st=0;
t=0;
i = 3;
while(st!=100){
P2=step[i];
delay();
i--;
if(i < 0)
i = 3;
st=st+1;
if(target == 1){
t=t+1;
ACC=st;
convert();
sendserial(binbuf4);
sendserial(binbuf3);
sendserial(binbuf2);
if(t==4) /* if no. of pulses = 4 */
{
ACC=t;
convert();
sendserial(binbuf4);
sendserial(binbuf3);
sendserial(binbuf2);
}
if(t==6) /* if no. of pulses = 6 */
{
ACC=t;
convert();
sendserial(binbuf4);
sendserial(binbuf3);
sendserial(binbuf2);
}
}
}
ACC='E';
sendserial(ACC);
ACC='N';
sendserial(ACC);
ACC='D';
sendserial(ACC);

}


void serial_init()
{
SCON = 0x50; /* mode 1, 8-bit uart, enable receiver */
PCON|= 0x80; /* PCON^7 = SMOD doubles the baud rate i.e. k=2 */
TMOD = 0x20; /* timer 1, mode 2, 8-bit reload */
TH1 = 0xFD; /* reload value for 19200 baud */
TR1 = 1;
IE = 0x90; /* Enable Serial Int */
}


void sendserial( unsigned char ch ) interrupt 4 {
TI = 0;
SBUF = ch;
while ( !TI );
}