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???
02/03/12 00:20
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 		 #185784 - RC-reset...
Responding to: ???'s previous message
Adam said:
BTW, yes at first time low-active design was significat.
ULN2003 etc. chips are used. But, some problems are noticed.

Post this design and we will have a look at it. What problems occured?

Adam said:
1-R/C Reset
2-8051 Start up ( It’s writing ports to logic-1)
3-My program...

RC-Reset is no good idea. If I use a 8052 without internal brown-out-resetter, I take a MAX1232 or something similar, like shown here:

http://www.8052.com/forum/read/109412

Care not only about power-on, but also about dips of supply voltage, so called brown-out events. A simple RC-reset can result in flash code memory defects.

Kai Klaas


List of 34 messages in thread
TopicAuthorDate
Power-On Port Status Problem            01/01/70 00:00      
   Wrong idea            01/01/70 00:00      
   you will not            01/01/70 00:00      
   you are not the only one            01/01/70 00:00      
   ATMEL be ashamed            01/01/70 00:00      
      No, YOU should be ashamed...            01/01/70 00:00      
      Nonsense!            01/01/70 00:00      
      PIC Does so            01/01/70 00:00      
         Oh really??            01/01/70 00:00      
            "Glitch" in the sense of kind of "setback in a plane"?            01/01/70 00:00      
   Try These Ideas            01/01/70 00:00      
   "Glitch"            01/01/70 00:00      
      what is not “ATMEL true”.            01/01/70 00:00      
      I think you are making excuses            01/01/70 00:00      
      Oh, boohoo!            01/01/70 00:00      
      What a bunch of fatty sausage...            01/01/70 00:00      
      "very easy problem"            01/01/70 00:00      
   Power-On Glitch            01/01/70 00:00      
      Nonsense - again            01/01/70 00:00      
      Please explain what the "power-on glitch" is ...            01/01/70 00:00      
      Into The Frying Pan            01/01/70 00:00      
      Power-on problem...            01/01/70 00:00      
      You are still blaming the tools            01/01/70 00:00      
   Design the hardware first.            01/01/70 00:00      
      do not Design the hardware first.            01/01/70 00:00      
   Power-On Glitch            01/01/70 00:00      
      that you had the worst possible reset circuit            01/01/70 00:00      
      RC-reset...            01/01/70 00:00      
      Sorry, double post, don't know why...            01/01/70 00:00      
         No, you're not the only one            01/01/70 00:00      
      Would I Hire?            01/01/70 00:00      
         incidentially            01/01/70 00:00      
   Power On satus Problem            01/01/70 00:00      
      echo, echo, echo            01/01/70 00:00      

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