FTDI Cable and ATMega328

Development Boards MicroMod
1

I just got an FTDI cable, and I’m trying to use it to communicate with an ATMega328.

The TXD line on the cable is always high. It looks like it blinks a bit when I try to send data. It’s as if the signal is inverted (normally high, temporarily low when sending a bit). Does this sound correct?

Thanks,

Chaz

2

TheRealChaz:
The TXD line on the cable is always high. It looks like it blinks a bit when I try to send data. It’s as if the signal is inverted (normally high, temporarily low when sending a bit). Does this sound correct?

The serial line idles in the high state, so yes that sounds correct. A start bit is detected with a high-to-low transition. You may want to do some wikipedia reading on UART’s.