![]() Not USB =>serial or parallel adapters) and usually don't work with Windows 7 or 8. Pic will turn off the high programing voltage. ![]() ![]() After programming / reading / verifying the PIC, Win. Those not containing a preprogrammed MCU) need a PC with legacy ports (i.le. You will almost certainly end up spending more to build your own programmer than a reputable PICkit 2 ot 3 clone costs. Programmers controlled by a parallel port avoid this issue. The usual omission is Vdd control which often makes it very difficult or impossible to reprogram any device running from internal oscillator with /MCLR disabled. Some PICs require Vdd, /MCLR(Vpp) PGC and PGD (total 4 signals)all to be controlled with tight timing for reliable programming but the PC serial port only has 3 output pins. All dumb serial programmers are crap as there just aren't enough output pins on the PC DE9 serial connector to control te ICSP signals properly. JDM) to get the initial firmware into the PIC18F2550, but a JDM programmer is simple enough to build on breadboard. You either need access to another programmer or to cobble up a dumb programmer (e.g. The schematic is in the user guide and the firmware and standalone application are open source. ![]() If you *really* want to build a programmer, it is possible to build a PICkit 2 that will work with MPLAB. ![]()
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May 2023
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