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Murray R. Van Luyn
08/12/11 01:33
Modified:
  08/12/11 01:55

Read: 790 times
From Down Under.


 
#183314 - Generating Interrupt Signal.
Greetings fellow 8052.com members.

I have need to generate a brief, low-going interrupt signal to bring an AT89C51AC2 out of power down mode.

I would like this interrupt signal to be generated whenever the normally ground-level output of another controller goes tristate. This transition occurs about every 24-hours, and lasts for about 5-seconds.

Now, the most logical solution would be to run the 2nd controller's tristate-active output through an inverter, and then use a simple RC circuit to generate the brief, low-going interrupt. Trouble is that I don't think I have the necessary power available to run the inverter, and I'm pretty much out of board space.

Can anyone think of a simple way out of this situation, one that doesn't use a lot of energy whilst the 2nd controller's triggering output is inactive (low)?

Regards,
M.

List of 10 messages in thread
TopicAuthorDate
Generating Interrupt Signal.      Murray R. Van Luyn      08/12/11 01:33      
   Power for inverter      Oliver Sedlacek      08/12/11 02:56      
      74HC1G14GW      Andy Neil      08/12/11 03:04      
         Yep, that will do the job.      Murray R. Van Luyn      08/12/11 03:43      
   Catching the L--->TS Condition      Michael Karas      08/12/11 04:53      
      Less logic?      Murray R. Van Luyn      08/12/11 05:45      
         Talking About Circuits      Michael Karas      08/12/11 06:20      
            Thanks      Murray R. Van Luyn      08/12/11 07:18      
               Open inputs      Per Westermark      08/12/11 12:32      
                  Will do.      Murray R. Van Luyn      08/12/11 18:32      

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