18F2520-how to use timer0

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hemnath

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i did programming using delays. looking forward to do with timer0.
compiler - CCS c compiler
pic - 18F2520.
internal oscillator - 4MHz

Please help how to start with? how to calculate time?

thanks in advance
 

thanks for ur information. i'm blinking the led with 5 sec delay. please tell that i'm doing it right?

HTML: 
#include "18F2520.h"
#fuses HS, NOPROTECT, INTRC_IO
#use delay(clock=4000000)			// 4MHZ internal clock 
//	fout = fclk/(4*prescaler* (256-TMR0)*count)
// 	for prescaler = 1 : 256 and TMR0 = 0
//	if need 5sec delay
//	Tout = 1/fout = 1/0.2Hz = 5sec 
//	count = 4Mhz/(4*256*(256-0)*0.2Hz) = 76.29 = 76 counts(approxi)

unsigned int count;

#int_RTCC
void clock_isr()
{
set_timer0(0);
count++;
if(count==76)				// 76 for 5sec delay // 15 for 1 sec delay
{
output_high(PIN_B7);
count=0;
}
}

void main()
{
set_tris_b(0x00);
setup_oscillator(OSC_4MHZ);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_256|RTCC_8_BIT);
enable_interrupts(INT_TIMER0); 
enable_interrupts(GLOBAL); 
while(1)
{
output_high(PIN_B6);
}
}
 

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