void sleep(unsigned int time)
{	TA0CTL = MC_0; 		// Stop timer
	TA0CCTL0 = CCIE; 		// enable CCR0 interrupt (IF on reaching TA0CCR0)
	TA0EX0 = 7;			// Set divider to 8 -> 32000 / 8 = 4000 1/s = 1/4 ms
	TA0CTL |= TASSEL_1 | TACLR | MC_1; 	// select ACLK, reset timer counter, set to count-up mode
	TA0CCR0 = time; 				// set CCR0
	__bis_SR_register(LPM3_bits + GIE);     // LPM3, Interrupts enable
}