sourceCode.c

#include <p18f452.h>
#pragma config WDT = OFF

#pragma idata access variable = 0x000
near unsigned char variable = 0;
#pragma idata

#pragma interrupt function
void function(void)
{
	if(INTCONbits.TMR0IF)
	{
		INTCONbits.TMR0IF = 0;
		TMR0H = 0x0B;
		TMR0L = 0xDC;
		variable = 0x01;
	}
}

#pragma code vector = 0x00008
void vector(void)
{
	_asm
		GOTO function
	_endasm
}
#pragma code

void main(void)
{	
	unsigned char triState[] = {3, 3, 5, 5, 6, 6}, displayValue[] = {4, 2, 4, 1, 2, 1}, i = 0;	
	TRISC = 0xF8;				// RC0,RC1,RC2 AS OUTPUT
	TRISD = 0xF8;				// RD0,RD1,RD2 AS OUTPUT
	INTCONbits.GIE = 1;			// ACTIVATE ALL INTERRUPTS
	INTCONbits.TMR0IE = 1;		// ACTIVATE TIMER0 INTERRUPT
	INTCONbits.TMR0IF = 0;		// DISABLE FLAG
	T0CON = 0x01;			
	TMR0H = 0x0B;
	TMR0L = 0xDC;
	T0CONbits.TMR0ON = 1;
	while(1)
	{
		if(variable)			// IF BLOCK IS TRIGGERED ONCE VARIABLE IS NON-ZERO
		{
			variable = 0;		
			LATC = triState[i];		// MAKE ONE OF THE PIN HIGH-IMPEDENCE
			LATD = displayValue[i];	// LIGHT UP THE LED
			(i == 5 ? i = 0 : ++i);	// CHECK IF WE CONVERED ALL THE LED
		}	
	}
}