3.5.2 PIC Assembler Global Options - General Instruction set This selector allows you to specify whether the Standard or Extended instruction set should be used for projects targeting PIC18 devices. See 3.4.18 Isa Option. Custom DFP path If you need to use an alternative Device Family Pack (DFP), enter the path to the DFP you wish to use in this field. See 3.4.16 Dfp Option.