unsigned long m_sysTime;
volatile unsigned char m_oneSecondPassed;

void sysInitSysTimer(void)
{
	m_sysTime = 0;
	m_oneSecondPassed = FALSE;
		
	//Reset control register
	TA1CTL = 0;
	//Set compare value on capture/compare 0 for 1 second 			
	TA1CCR0 = 0x7FFF;	
	//Use ACLK
	//Divide by 1
	//Count up
	//Enable interrupt
	TA1CTL = TASSEL_1 | TACLR | MC_1 | TAIE;		
}

#pragma vector = TIMER1_A1_VECTOR
__interrupt void Timer1A1ISR(void)
{
	//Reading TA1IV clears the interrupt
	switch(__even_in_range(TA1IV,14))
	{
		//Unused vectors
		case 0: 
		case 2:								
		case 4:									
		case 6: 		    				
		case 8:						
		case 10:						
		case 12:
			break;							
		case 14:									
			m_sysTime++;
			m_oneSecondPassed = TRUE;
			break;
		default: _never_executed();
	}
}

unsigned char sysHasOneSecondPassed(void)
{
	unsigned char retValue = m_oneSecondPassed;
	
	if (m_oneSecondPassed)
		m_oneSecondPassed = FALSE;
		
	return retValue;
}