ATMEGA640 datasheet(206/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

Note:

1. See “About Code Examples” on page 10.

More advanced initialization routines can be made that include frame format as parameters, disable interrupts and

so on. However, many applications use a fixed setting of the baud and control registers, and for these types of

applications the initialization code can be placed directly in the main routine, or be combined with initialization code

for other I/O modules.

Assembly Code Example(1)

USART_Init:

; Set baud rate

sts

UBRRnH, r17

sts

UBRRnL, r16

ldi

r16, (1<<U2Xn)

sts

UCRnA, r16

; Enable receiver and transmitter

ldi

r16, (1<<RXENn)|(1<<TXENn)

sts

UCSRnB,r16

; Set frame format: 8data, 1stop bit

ldi

r16, (2<<UMSELn)|(3<<UCSZn0)

sts

UCSRnC,r16

ret

C Code Example(1)

#define FOSC 1843200// Clock Speed

#define BAUD 9600

#define (MYUBRR FOSC/16/BAUD-1)

void main( void )

{...

USART_Init ( MYUBRR );

...} // main

void USART_Init( unsigned int ubrr){

/* Set baud rate */

UBRRH = (unsigned char)(ubrr>>8);

UBRRL = (unsigned char)ubrr;

/* Enable receiver and transmitter */

UCSRB = (1<<RXEN)|(1<<TXEN);

/* Set frame format: 8data, 2stop bit */

UCSRC = (1<<USBS)|(3<<UCSZ0);

} // USART_Init

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