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???
02/19/06 09:54
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 		 #110290 - Saving Power
Responding to: ???'s previous message
Richard Erlacher said:
It seems that the smartest thing one could do in this case is to select the slowest input clock frequency that will still allow everything to function. Someone has already touched on that in passing, but it will serve a number of useful purposes, not the least of which is saving power, since this looks as though it should be a battery-operated application.

There are two approaches to saving power.

1. Lower the crystal frequency. This is the only option if you must have power on the micro all the time.

2. Process only what you have to then sleep. If you can sleep 90% of the time this will save more power than any amount of lowering the clock frequency.

Ian

List of 41 messages in thread
TopicAuthorDate
Polling vs interrupts in a chess clock.            01/01/70 00:00      
   Polling            01/01/70 00:00      
      Debounce            01/01/70 00:00      
   Either            01/01/70 00:00      
      debounce?            01/01/70 00:00      
         Yes            01/01/70 00:00      
      Alternatively            01/01/70 00:00      
         but PBs update clocks asynchronously            01/01/70 00:00      
            micro time vs real time            01/01/70 00:00      
               One second is a long time in Blitz chess            01/01/70 00:00      
            Use a fast main loop            01/01/70 00:00      
               but this won't let us power-down            01/01/70 00:00      
                  Do what Ian says            01/01/70 00:00      
                     I don't understand            01/01/70 00:00      
                        set a flag in the PB ISR right?            01/01/70 00:00      
                           No pb isr as such.            01/01/70 00:00      
                              The PB INTs wake up the cpu also            01/01/70 00:00      
                                 re: The PB INTs wake up the cpu also            01/01/70 00:00      
                                    Still LCD            01/01/70 00:00      
                              Isn't PB bouncing going to be a problem?            01/01/70 00:00      
                                 No            01/01/70 00:00      
                                    OK, I get it now, thanks            01/01/70 00:00      
                                       In the timer loop            01/01/70 00:00      
                                          Is it?            01/01/70 00:00      
                                             No            01/01/70 00:00      
                                                ISR capability?            01/01/70 00:00      
                                                   Pick a way            01/01/70 00:00      
                                                   ISR reources            01/01/70 00:00      
               Debounce            01/01/70 00:00      
            Define Immediately            01/01/70 00:00      
               No if the debounce is post delay            01/01/70 00:00      
                  Granted            01/01/70 00:00      
               naah and to the question bu the OP            01/01/70 00:00      
   The smartest thing ...            01/01/70 00:00      
      Re the smartest thing            01/01/70 00:00      
         Re Re the smartest thing            01/01/70 00:00      
         as for the character LCD ...            01/01/70 00:00      
            There are several IC to do this            01/01/70 00:00      
               Perhaps it's cheaper ...            01/01/70 00:00      
                  DigiKey has them            01/01/70 00:00      
      Saving Power            01/01/70 00:00      

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