AVR-Chat

--- In AVR-Chat@yahoogroups.com, James Washer <washer@t...> wrote:
>
> I need to implement a bit-bang serial port. It's my understanding 
the RS232 "idles" high, which would mean the logic level out of a 
max232 would be low. The start bit would then be logic high to the 
AVR.. Is this correct?

No, if I understand you correct. The word "high" is missleading.

Serial comm idles at a logical "true" or "1" level. On the RS232 side 
this is represented with a -15 to -3V signal. On the TTL side of the 
MAX chip it is represented by a 5V signal. The reverse, a logical 
false or "0", is represented by a +3-+15V signal and a 0V signal 
respectivily.

Ingvar