From: Greg King (gngking_at_erols.com)
Date: 2003-09-21 22:55:48
From: Maciej Witkowiak; on Date: Tuesday, September 16, 2003, 07:41 PM > > Now, the only thing missing is the detection of when the SID starts it's > measuring cycle. In the document from funet, the POTX line is connected > to the uC's interrupt-input. So, when it changes from high to low, > there is an interrupt triggered. I tried using it in my design, but it > failed to work. There also is this quote from the funet document: > > "Unfortunately, the POTX signal that was enough for the 16C84 to sense > an interrupt-request, is too 'off' for this Schmitt-trigger input :-(. > What you see from this is that you can use the 16F84 as a 16C84 > substitute -- but the interface won't work in native 1351 mode, at all! > The same applies, BTW, for the 16CR84 chip." Am I correct in assuming that "C" means CMOS, and that "F" means "Fast" (so, the 16F84 is not CMOS)? What does "CR" mean? From: Maciej Witkowiak; on Date: Wednesday, September 17, 2003, 07:36 PM > > Today, I tried various configurations of pullups/pulldowns with single- > and double-inverters; and, it just didn't work most of the time -- > nothing reliable. It seems that it makes almost no difference if there > is an inverter or not. Did you try a CMOS inverter? Message was sent through the cbm-hackers mailing list
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