and thus the reason for JTAG......wouldnt it be nice if they supported JTAG? course it eats up 4 pins but maybe use the lower 4 port B pins? cant use that much silicon to throw on the JTAG state machine. "Timothy J. Weber" wrote: Olin Lathrop wrote: > Herbert Graf wrote: >> Otherwise, any ICSP programmer >> that allows for the target to supply power can theoretically support >> ICSP below 5V. > > Or the other approach is to let the programmer supply power. All mine do > this so that they can set Vdd to 5V to do a bulk erase. You do have to > design your power supply to be tolerant of this. It might also mean > separating the PIC supply with diodes. I've kept that sort of thing in mind, but I'm trying not to be that clever. The dumb solution (pop the PIC off the breadboard and into the ZIF programmer) seems more reliable than "OK, have I been clever enough? Because if not, I'm about to fry this $32 module now." I guess another issue for me is that some of my current projects have 3 different PICs on different breadboards. So if I went with ICSP, I'd be forever moving one set of programming leads around on the breadboards - or I'd have to make three sets of flying-lead connectors to plug the programmer into. Then I'd have to pull them out anyway, because the breadboards get taken elsewhere for testing. Again, pulling chips and plopping them in the ZIF socket is dumb but it's more reliable. If I get this project to the point where I'm making PCBs, adding a few headers for ICSP (and getting it working with self-power or adding diodes) makes a lot more sense. Thanks for the reminder that it Can Be Done. -- Timothy J. Weber http://timothyweber.org -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --------------------------------- Be a PS3 game guru. Get your game face on with the latest PS3 news and previews at Yahoo! Games. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist