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???
03/31/08 08:47
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#152738 - So using a one-shot seems the best idea..right?
Responding to: ???'s previous message
So I guess using a one shot seems to be the best idea now.
The one shot will momentarily be in the low quasistable state and
then come back to high state. This would start the oscillator and execute my ISR.

This would happen even when the IRQ pin is asserted low all the time by the RTC chip.

My ISR would get called after the IRQ line gets pulled high again and I would read a particular register within the RTC which would make the IRQ line to de-assert.

Hopefully this would work. I shall try it and post my results.

Thanks again!

~Seemanta


List of 42 messages in thread
TopicAuthorDate
Problem waking up from power down mode:AT89S52            01/01/70 00:00      
   Have you seen the pulse?            01/01/70 00:00      
      Saw tthat            01/01/70 00:00      
         I agree!            01/01/70 00:00      
      monoflop IC number?            01/01/70 00:00      
         also know as one shot (in the foot)            01/01/70 00:00      
            Supervisor chip?            01/01/70 00:00      
               try digikey            01/01/70 00:00      
                  Can you explain how that would help?            01/01/70 00:00      
         how about 4538?            01/01/70 00:00      
         You can, but also read this...            01/01/70 00:00      
      Maybe rather than a monoflop....            01/01/70 00:00      
         Ehem...            01/01/70 00:00      
            Ehem....Hmmm            01/01/70 00:00      
               Why messy?            01/01/70 00:00      
               Remember that the oscillator is turned off            01/01/70 00:00      
                  So using a one-shot seems the best idea..right?            01/01/70 00:00      
                     a one shot should always ...            01/01/70 00:00      
                        I tried using an RC circuit...but it did not work            01/01/70 00:00      
                           sorry, I was wrong            01/01/70 00:00      
                              If one shot is a close second...            01/01/70 00:00      
                                 I'd rather not            01/01/70 00:00      
                                    but problem with FF is that            01/01/70 00:00      
                                       ah, Arghmel            01/01/70 00:00      
                           Not same part            01/01/70 00:00      
                     If You Use PCF8563 RTC...            01/01/70 00:00      
                        555 vs '121? Which is better?            01/01/70 00:00      
                           121 ..            01/01/70 00:00      
                              I used a 74LS121 and...            01/01/70 00:00      
                                 yes it will, but            01/01/70 00:00      
                                    HC and HCT?            01/01/70 00:00      
                                       there is this fancy newfangled thing ....            01/01/70 00:00      
                                    There is no 74HC121, but HC123 and HC221            01/01/70 00:00      
                                 Should really consider....            01/01/70 00:00      
                                    I really would consider PCF8563 but...            01/01/70 00:00      
                           Digital pulse is still better            01/01/70 00:00      
                     I would try this            01/01/70 00:00      
                        elegant, but why ....            01/01/70 00:00      
                           You can, of course, but...            01/01/70 00:00      
                              reg power consumtption...            01/01/70 00:00      
                                 Have you seen my circuit?            01/01/70 00:00      
                                    Pulse Mode from RTC,,,,            01/01/70 00:00      

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