H/L & use high or low 16-bits & L (not set) \\ \hline
F & fill unused 16-bits with value of F & 0 (not set)\footnote{this means that andxf must be used, if the not specified 16-bit, should be preserve} \\ \hline
H/L & use high or low 16-bits & L (not set) \\ \hline
F & fill unused 16-bits with value of F & 0 (not set)\footnote{this means that andxf must be used, if the not specified 16-bit, should be preserve} \\ \hline