Testing if an entire register is 0 on the pic

[bitem2k]

Is there anyway of telling if the entire register byte is 0, instead of checking each bit individually?

i,e check if all bits of a port are off.

many thanks

 

[Nigel Goodwin]

Yes, various ways of doing it - probably the easiest is movf it to W, and check the zero flag.

 

[bitem2k]

Ok thanks very much nigel.

 

[Pommie]

Another way would be to move the file into itself with mov File,F. This instruction does nothing except set the zero flag if the file is zero.

Mike.

 

[bitem2k]

ok, thanks