ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 136

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

136
ATmega8(L)
Note:
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.
Assembly Code Example
C Code Example
USART_Init:
void USART_Init( unsigned int baud )
{
}
; Set baud rate
out
out
; Enable Receiver and Transmitter
ldi
out
; Set frame format: 8data, 2stop bit
ldi
out
ret
/* 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);
1. The example codes assume that the part specific header file is included.
UBRRH, r17
UBRRL, r16
r16, (1<<RXEN)|(1<<TXEN)
UCSRB,r16
r16, (1<<URSEL)|(1<<USBS)|(3<<UCSZ0)
UCSRC,r16
(1)
(1)
2486M–AVR–12/03