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Or, try to use this ucontroller frm microchip: PIC18F4550
"... the availability of three serial ports: FS-USB(12Mbit/s), I²C™ and SPI™ (up to 10 Mbit/s) and an asynchronous (LIN capable) serial port (EUSART)"
Ow..I never thought it's complicated as that..
I was considering PL2303 since FTDI is not available in my place..
but the PL chip has a bad impression in me..I bought a USB data cable for my Nokia phone and it was not working the chip inside is PL2303, so I think PL chips are not that good..