Russell ,

Thanks for your replay.  at this point I inverted externally
using logic gate single transistor is good idea too.

andre




Russell McMahon wrote:

> Probably not I'd say.
> BUT
> To do it in software probably costs very little.
> single NPN small signal transistor, emitter to ground.
> 10k resistor from output pin to transistor base.
> Resistor (size depends on drive required - 1k to 10K probably) from
> collector to Vcc.
> Output from collector.
>