ATMEGA323L-4AI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA323L-4AI

8-bit Microcontroller with 32K Bytes of In-System Programmable Flash

Atmel Corporation 

Assembly Code Example(1)

USART_Init:

; Set baud rate

out UBRRH, r17

out UBRRL, r16

; Enable Receiver and Transmitter

ldi r16, (1<<RXEN)|(1<<TXEN)

out UCSRB,r16

; Set frame format: 8data, 2stop bit

ldi r16, (1<<URSEL)|(1<<USBS)|(3<<UCSZ0)

out UCSRC,r16

ret

C Code Example(1)

void USART_Init( unsigned int baud )

{

/* Set baud rate */

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

UBRRL = (unsigned char)baud;

/* Enable Receiver and Transmitter */

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

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

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

}

Note: 1. The example code assumes that the part specific header file is included.

More advanced initialization routines can be made that include frame format as parame-

ters, 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.

80 ATmega323(L)

1457G–AVR–09/03

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