UART v TTL a I2C konektory - standard?

[Snail Instruments]

>Chcem si zbastlit jednoduchy pristrojcek: display + uP, ako debug-tool
>k vyvijanym uP zariadeniam, ktory bude zobrazovat ladiace vypisy
>posielane seriovou (v RS232, aj v TTL/CMOS urovniach)

Neco takoveho se da koupit i hotove:
http://www.snailinstruments.com/cze/robotics/electro.php#SIC1602A20
http://www.seetron.com/slcds.htm
http://www.robot-electronics.co.uk/shop/I2C_Serial_Display_LCD032058.htm

J. Hanzal