4. Teil

R1IN
R2IN
T1IN
T2IN
R1OUT
R2OUT
T1OUT
T2OUT

Baudrate: 1 Symbol pro Sekunde: 1 Baud
Jean Maurice Emile Baudot
Baudot Code 1874?
Urspr"unglicher Synchroner, Digitaler 5 Bit Zeichenkode: CCITT-1

UBRR
UBRRL UBRRH - Atmega8
UCSRA UCSRB UCSRC
UDR


UBRR: UART Baud Rate Register:
UBRRL UBRRH - Atmega8
UCSRA UCSRB UCSRC: UART Controll Register
UDR: UART Data Register

Baudrate: UBRR: (Taktfrequenz des Prozessors)/(1*Baudrate)-1

Bits:
    UDRE - UART Data Register Empty
    UCSZ0, UCSZ1: UCSRC
    URSEL:  UCSRC
    TXE
    TXEN