Two functions in the high priority interrupt.

#pragma code
#pragma code My_HiPrio_Int=0x0008	
#pragma code
#pragma interrupt chk_isr

#pragma code
void My_HiPrio_Int(void)
{
	_asm
		GOTO chk_isr
	_endasm
}

void chk_isr(void)		/*Serial Interrupt*/
{	
	INTCONbits.GIE = 0;

	if(INTCONbits.TMR0IF==1)   //Timer routine
		Timer0_ISR();

	if(PIR1bits.RC1IF)     //RS485 receiver 
		RC_ISR();

	INTCONbits.GIE = 1;


}


void Timer0_ISR(void)
{
	nTick0++;

	if(pSet == 0) nTickSetPress++;
	else nTickSetPress = 0;

	if(pPlus == 0) nTickPlusPress++;
	else nTickPlusPress = 0;

	if(pMinus == 0) nTickMinusPress++;
	else nTickMinusPress = 0;

	if(pShift == 0) nTickShfPress++;
	else nTickShfPress = 0;

	if(pCountPlus == 0) nTickCount++;
	else nTickCount = 0;

	if(pReset == 0) nTickResetPress++;
	else nTickResetPress = 0;

	if(bCdlyStart == 1) nCdlyCount++;
	if(nCdlyCount >= nTickCdly) bCdlyStart = 0;

	if(bDisplayTime == 1) nDisplayTimeCount++;
	
	if(bBlinkDigitFast == 1) nTickBlinkFast++;

	TMR0H = TMR0HValue;
	TMR0L = TMR0LValue;
	INTCONbits.TMR0IF = 0;
}


void RC_ISR(void)		
{
	rxbuf485 = RCREG1;
	
	if (rxbuf485 == 0)
	{
		return;
	}

	if (rxbuf485 == TOKEN)
	{
		b485RxToken = 1;
		return;
	}

	if (b485RxComplete) return;
	
	if (!b485SOH)
	{
		if (rxbuf485 != SOH) return;
		b485SOH = 1;
		n485RxDataPos = 0;
		b485RxComplete = 0;
		memset (RS485RXDATA, 0, sizeof(RS485RXDATA));
		return;
	}	
	else if (rxbuf485 == EOT)
	{
		b485SOH = 0;
		b485RxComplete = 1;
		return;
	}
	if (n485RxDataPos == 50) 
		n485RxDataPos = 50;

	if (n485RxDataPos>=RS485RXSIZE)	
		n485RxDataPos--;
	
	RS485RXDATA[n485RxDataPos++] = rxbuf485;
	return;
	
}

void Timer0Init(void)
{
	T0CON = 0x07;
	TMR0H = TMR0HValue;
	TMR0L = TMR0LValue;
	T0CONbits.TMR0ON = 1;
	INTCONbits.TMR0IE = 1;
	nTick0 = 0; 
	nTickSetPress = 0;
	nTickResetPress = 0;
	nTickCdly = 0; 
	nTickBlinkFast = 0;
}

void RS485Init(void)
{
	TRISCbits.TRISC7=1; 	// RX
    TRISCbits.TRISC6=0; 	// TX

	TXSTA1 = 0x00;			
	RCSTA1 = 0x90;		
	SPBRG1 = 30;			
	BAUDCON1 = 0x00;	
	PIE1bits.RC1IE = 1;		 
	TRISCbits.TRISC3 = 0;
	p485 = 0;				
	
	memset (RS485RXDATA, 0, sizeof(RS485RXDATA));	
}