ATxmega-B1 XPLAINED: USART TUTORIAL

 XMEGA USART | Embedded Tutorials (wordpress.com)

void init_usart()

{

PORTC_DIR|=0x08; //set the direction of PC3 i.e. TXD0 as output and PC2 i.e. RXD0 as input

USARTC0.BAUDCTRLB = 0x60 + (3269 >> 8);

USARTC0_BAUDCTRLA=3269 & 0x00FF;

//USARTC0.BAUDCTRLB = ((0x03 & 0xf0f) >> 0x08);

//USARTC0.BAUDCTRLB |= ((-4 & 0x0F) << 0x04);

//USARTC0_BAUDCTRLA=0xc5;

USARTC0_CTRLB|=USART_RXEN_bm|USART_TXEN_bm; 

USARTC0_CTRLC|=USART_CHSIZE1_bm|USART_CHSIZE0_bm;

USARTC0.CTRLA = USART_RXCINTLVL_LO_gc;

USARTC0.STATUS |= USART_RXCIF_bm; // 0x80  0b10000000

}