a 32 kHz can be used to drive TIMER2 on PC6 & PC7. RTC without any extra cost.
Would love to see the outcome of this thread.
do you have the SQW signal going to an interrupt pin so you can create a version of millis() that doesn't skip a beat or have the RTC wake the processor at 3AM.
Well, for me at least, the DIP version allows you to keep the board in case you fry the processor. I'm not good at soldering, and processors do go bad once in a while. In terms of investment and considering most people are not great with soldering SMDs, this is quite logical.
What lefty is suggesting is (I think) exactly what I have on my two current 1284 designs.Note the diode on the FTDI chip's RXD line. I'm not 100% sure that's needed but I've had trouble before with this sort of setup where the active chip powered the inactive chip through the IO pin. This is easy to get around by tristating the active chip's output as well but I prefer a hardware option that doesn't require a use to know about this stuff.This should allow the USB chip to only be powered when USB is available.@crossroads, this is a board designed for my network and it's pretty specific to that. I won't be competition, not yet anyway ______Rob