The only "real" low power mode is the "power-down" (with WTD disabled <1uA, with WDT on 6-10uA). This mode cannot be wakedup by usart. All other modes are mostly >>100ua. Power-down: Only an External Reset, a Watchdog Reset, a Brown-out Reset, a Two-wire Serial Interface address match interrupt, an External level interrupt on INT0 or INT1, or an External interrupt on INT2 can wake up the MCU...
----- PŮVODNÍ ZPRÁVA ----- Od: "Matthias Trute" <[email protected]> Komu: [email protected] Předmět: Re: [Amforth-devel] Ultra Low Power operation Datum: 4.4.2011 - 20:16:43 > Hi, > > > > Hi, as the amforth will not be a subject of > > power computing let me > > > ask the experts following: > > 1. would it be possible to create a mechanism > > where amforth/atmega > > > will be run on _very_ low power - basically > > powerdown or sleep > > > I did not yet implemented it, but the strategy > should be strait > forward (as far as I understood the sleep mode > section): > > 1) use the multitasker > 2) setup an idle task which does nothing but enter > the right > sleep mode > 3) whenever an interrupt is able to wake up the > controller, the > processing will continue. Sooner or later the > multitasker will > re-call the sleep task and everything is quiet > again. > > > 2. the rx will be connected to an additional > > interrupt pin > > > The usart interrupts can trigger the sleep-end > condition itself. > > > 3. after receiving a character it will issue > > some message on state - > > > that everything is ok (e.g. none reset or > > power-off occured) and it > > > will start to communicate with us in a normal > > way.. > > > After leaving the sleep mode, the controller > continues just like > if nothing has happened. Until the next sleep > instruction is called > (there is a stupid wrapper word in the dictionary > which does nothing > but call the SLEEP intruction.) > > > 4. when not communicating with host for e.g. > > 10sec, or none tasks to > > > accomplish, it will go to low power state > > again.. > > > why wait? whenever the idle task is activated, the > main task has nothing > to do at all. > > Some googling revealed some pitfalls (connected > usart devices or > connected programming tools like debuggers may > prevent the power save > effects) however. in German: > http://www.mikrocontroller.net/articles/Sleep_Mode > > I'd like to hear if it works. If it doesn't of > course too > > Matthias > > ------------------------------------------------------------------------------ > > Create and publish websites with WebMatrix > Use the most popular FREE web apps or write code > yourself; > WebMatrix provides all the features you need to > develop and > publish your website. > http://p.sf.net/sfu/ms-webmatrix-sf > _______________________________________________ > Amforth-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/amforth-devel > ------------------------------------------------------------------------------ Create and publish websites with WebMatrix Use the most popular FREE web apps or write code yourself; WebMatrix provides all the features you need to develop and publish your website. http://p.sf.net/sfu/ms-webmatrix-sf _______________________________________________ Amforth-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/amforth-devel
