It says (t)est (b)it Z of the named (f) register and (s)kip the next line if (c)lear So it'll test the STATUS register for the flag status bit "Z"ero. i.e. if the condition of the previous line resulted in the zero flag not being set then skip the next line. Pete > -----Original Message----- > From: ext Lucas Fenoll Molina [mailto:lucas.fenoll@LIBERTYSURF.CO.UK] > hi I would like to know what does this line of code thanks > > btfsc STATUS,Z -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.