Hello, What is the relationship between using the MPASM config directive and actually writing your software to program the PIC configuration bits? If config takes care of the bits, do the appropriate programming instructions just magically get embedded into your machine code? I have an example of config from Microchip: __config (_XMC_MODE & _EC_OSC & _WDT_OFF) Note: These symbols are defined in p17c43.inc Magic or not? -Brian-