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John Papas
06/19/12 03:39
Read: 592 times
Freiburg
Germany


 
#187787 - RE
Responding to: John Papas's previous message
i take for a short time a positive pulse(from the latch outputs and from the high address port) at the same time.
In the assembly program i have programmed already a pin . From this pin i do not take anything. My rs232 communication works fine with working circuits. It seems that the MC is frozen. Crystal output ok, ALE ok.
In the circuits that have this problem, the MAX307 is also destroyed(the reset is always active) or its output is lower than its supply. So, when the supply is 5v i should take 5V, but i measure 4V. The circuit does not differ from a circuit that exist in many books, unfortunately i work in small company and i take it in paper.
Thank you for your attention

List of 14 messages in thread
TopicAuthorDate
circuit repair, high level of all adress bytes      John Papas      06/15/12 15:16      
   what's on P2 is not that intersting initially, ...      Erik Malund      06/15/12 16:46      
      oszi daten      John Papas      06/18/12 12:16      
         depends on the app, but still      Erik Malund      06/18/12 12:51      
      we'll need a schematic, I believe.      Richard Erlacher      06/18/12 19:38      
   general guidelines      Mahmood Elnasser      06/18/12 22:45      
   RE      John Papas      06/19/12 03:39      
      Hardware check      Mahmood Elnasser      06/19/12 07:34      
      anyhow this begs a question      Erik Malund      06/19/12 09:24      
         Replay      John Papas      06/19/12 15:52      
            It wouldn't hurt to know how you've connected your hardware      Richard Erlacher      06/19/12 17:03      
               new      John Papas      06/20/12 07:12      
                  Just curious...      Hal Albach      06/20/12 07:34      
                     I have to agree with Hal, it can't be done ...      Richard Erlacher      06/20/12 09:13      

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