Inputs don't use the shadow register. Just read the port directly.

btfss/btfsc does ofcourse read the port but they don't write anything back =
so =

there is no rmw issue here and it doesn't involve the shadow register at al=
l.

You can even read the outputs and verify that they are the same as the shad=
ow =

register. Only the output bits then ofcourse. If they are not the same, it =

could be because an output is shorted or overloaded.

/Ruben

> > One way to solve this is to never read the the value from the port to
> > the shadow register but keep the shadow register as a global variable
> =

> That would be impractical if you have to monitor inputs. I'm sure that
> eg btfss pin / btfsc pin reads the port
> =

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Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
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