Dnia 21-08-2011 o 00:10:21 Jan Kandziora <j...@gmx.de> napisał(a):
(Other useful chips like the DS2409 are discontinued, too. I think it is time to think about home-brewn replacement parts using AVR or PIC controllers.)
There is a project to replace the counter and the switch with AVR but it only compiles for AVR that aren't avilable in my local store. I can't port it to the most popural atmega8
https://github.com/smurfix/owslave
So either remove the RC filter (C1) from the input or better, put 1/6 40106 between the filter and the 74HC590 clock inputs. You could skip Q1, R3, R2 inthat case, too, the 40106 will do the amplifying and inversion.
This really help a lot. Now the counting seems to be OK. Thanks.
No. RSTZ is an input. It can be used by an external circuit to switch off the PIO outputs to avoid a "wired-or" of the input data with the current outputdata.
But this is a quote form datasheet. Page 5 table with pin description http://datasheets.maxim-ic.com/en/ds/DS2408.pdf...When configured as STRB, an output strobe will occur after a PIO write (see Channel-Access Write command) or after a PIO Read (see Channel-Access Read command). The power-on default function of this pin is RST.
I also attach the schematics if anyone would like to build this circuit. -- p4trykx
<<attachment: counterSchmitt.png>>
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