Hi Oleg,

What does your datasheet say about the logic levels for your derivative's port 0? I haven't read the datasheet, but I believe I recall someone recently saying that 1 V to 1.99 V was considered undefined (please don't hold me to those numbers). Maybe it's more like 0.5 V too 2.5 V that's undefined. The short answer for me, being the dedicated experimentalist, is that if it works it works, but with what reliability? If 3.0 V is above the upper limit of the undefined range I would think it should work nicely. And assuming that it does, ir shouldn't be too difficult to set up an experiment to let it run for a couple of days to see if it's reliable.