Hi Rob,

as Jon pointed right, there exist no rule, how bit fields arranged into a byte.

So using bit fields on a port variable, locks never elegant, since it can cause a different pin usage on different ANSI compilers !

So it looks only possible faulty !


I try always to avoid such ANSI C statements, which can work compiler dependent.

And on ports e.g. it is possible to use masking bits inside a byte:

P1 |= 1<<2; // set P1.2

Furthermore on the 8051 exist some C language extensions to access port pins directly (sbit).


Peter