S, Erik Christiansen piše: > On Sat, Dec 04, 2010 at 09:04:54AM -0800, Kirk Wallace wrote: >> Then I got to thinking about what Slavko mentioned previously, >> about this is a safety device and I should think in terms of how it >> could fail. > So long as the microcontroller's on-board watchdog is enabled, you have > a watchdog watchdog to provide recovery from a soft error. > > When driving a critical output, you can add a pull-[up|down] resistor, to > maintain the desired default state during power-up and any reset applied > by the on-board watchdog. > > Erik That's funn... If you already have watchdog (hardware) to keep ATtiny RESET good why do you need that MCU at all?!? Seems nonsense for me.
I don't hate MCU's. I use it a lot. But in places where they (I think) are needed. And Watchdog of that kind is surely not good idea. But someone on forum say's something about PLL. That can be good idea too. There are some tondecoder PLL's like NE567. Cheap 8 pin DIL chip and two resistor's and one cap can solve that problem perfectly. You just need to do software chargepump at servo rate (1ms for example) and got 500Hz output for PLL. That's seems ideal too for me. Can't triger on wrong pulses and react fast. Slavko. ------------------------------------------------------------------------------ What happens now with your Lotus Notes apps - do you make another costly upgrade, or settle for being marooned without product support? Time to move off Lotus Notes and onto the cloud with Force.com, apps are easier to build, use, and manage than apps on traditional platforms. Sign up for the Lotus Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
