[Arm-netbook] [EOMA68] RS232 on SoCs

[Henrik Nordström]

lör 2013-09-07 klockan 03:12 +0100 skrev luke.leighton:

>  ok do you mean 3.3V with a resistor?  so the connection goes:

Yes. The diode allows external cable to pull low to 0V only, with
internal pullup to return to 3.3V. serial communication is active low.

> is that actually the case?  do 3.3V UART cables pull down to 0V (or
> close to it)?

Yes.

Regards
Henrik