AVR-Chat

At 12:47 AM 2/09/2005, you wrote:
>Witness RS-232-C and IBM,for example.
...................
>shoudl be, until I realzied I needed to change the sense of my logic.
>Switched to having ground potential read as a logic one,and Vcc as a
>logic zero, and everything ran perfectly.

Do you mean that you didn't have an RS232 chip connect to the
AVR? =-O

EVERYBODY :-) knows that the RS232 standard uses -12V for a one
and +12V for a zero ;-) but if you do the right thing and use
the correct interface then 0V is logic 0 again in your system
and don't have to worry what happens outside. Many people make
the mistake of hooking up the RS232 of a computer directly to
the micro's UART pins :-(

Regards

John Samperi

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