That could be a problem. I was thinking you would either be reading
bits or writing them - i.e all port pins would be of the same "type".
But if you need to read some & write others on the same device then I
guess you have to put up with a momentary higher current - although if
it's limited to 1mA as others suggest then that's not too much a
penalty.
RP

On 02/11/05, James Newton, Host <jamesnewton@piclist.com> wrote:
> > I think that if you set them high & then use them as inputs
> > you are OK. If you only read from them then the high current
> > pulse output is not enabled. The only time it is enabled is
> > if you are writing to them as outputs and are going through a
> > low-high transistion.
>
> Right, but how does one avoid writing a 1 to the pins you are using as
> inputs while at the exact same time writing 1's or 0's to the other pins
> which you are using as outputs?
>
> > >
> > > http://focus.ti.com/lit/ds/symlink/pcf8575.pdf
> > >
>
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