Very possibly. Remember, I am not a h/w person. I used the same term that the guy who demonstrated the Bluetooth gear used. He said the BT module had a real UART, and that it worked at a nominal 3.3V. He asked if the UART in the AT89C55WD was a real UART. I am trying to answer that question. I also have to get the UART to talk to this module without blowing it up.

I couldn't find a description of the pins in the Atmel spec sheet, http://www.atmel.com/dyn/resou...oc1921.pdf (section 10), it refers to another document http://www.atmel.com/dyn/resou...OC4316.PDF (section 2.13), saying it works the same as a number of other chips. This further document also did not talk about voltages, but there was a block diagram of how it functions, and to me at least, it looked like it was working at the supply voltage, i.e. 5V, which is above the lethal limit, (3.7V), for the module.