I see that the ICSP programmer power supply the board where there is a PIC to program and there are some solution with diode to isolate MCLR and VDD to the onboard power supply and ICSP connector . OK is it right. But if my board has the 2 power supply to program the PIC (5V and 13V) Can I use this power to supply the programmer without to use an external power supply only for the programmer ? I will use a switch on MCLR pin for normal and program operation.