The PICkit 2 has USB bootloader and capable of updating the programmer firmware directly from Microchip web site. I do not think that functionality is required for a hobbyist but allows simplify the schematic by omitting two 24C512 EEPROM chips. That functionality allowing a hex file to be downloaded to the PICkit 2 to later program PIC microcontrollers without a PC with a simple pressing programmer’s push button. The schematic I have used is based on the original PICkit 2 without programmer-to-go functionality. Most of the clones will produce unregulated 5 volt VPP where the original Microchip PICkit 2 provides adjustable VPP output to allow 3.3 and 2.5 volt parts programming. Because of that it is easy to build a clone version of the original device. PICkit 2 was originally built by Microchip as open design programmer with the schematic, source code and firmware available to boost the popularity of the PIC devices. LVP (low-voltage programming mode control) The pin-out for Microchip standard 6-pin connector for In-Circuit Serial Programming (ICSP) is listed in table below: Pin As alternative you can use the standalone programmer applet, see picture below. It is fully integrated with Microchip’s MPLAB IDE and allow not only program but debug applications as well. Only subset of PIC microcontrollers is supported, but the list is including all the recent devices from PIC16, PIC18 and PIC24 families and certainly covers all the PICs you are most likely want to use. Microchip’s PICkit 2 is the low cost ICSP programmer for Flash PICs with USB interface introduced by Microchip. That is the root of the problem with third-party PIC programmers. As Microchip introduces the new microprocessors the programming software got to be updated accordingly playing catch-up with the PIC manufacturer. There are many PIC programmer available, commercial and DIY devices.
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