UART_RX:
in r16, UDR
andi r16, $7C
+out UDR, r16
out DDRD, r16
reti
; baudrate einstellen
ldi r16, 11 ; "38400 bps wert" in r16
out UBRR, r16 ; write to uart baudrate register
-sbi UCR, (RXEN|RXCIE) ; enable tx at uart control register
+sbi UCR, (RXEN|TXEN|RXCIE) ; enable tx at uart control register
sei