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???
03/17/07 16:20
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 		 #135171 - Re: 80xxx
Responding to: ???'s previous message
M. Astiz said:

The microcontroller is a Philips 80C52


80xxx means ROMless or factory programmed without any chance to alter the code.

Maybe you should use a flash derivate (e.g. AT89C51ED2), then all four ports can be used.

But watch, that P0 need external pullups to see high level (driving LEDs against VCC need no pullup, only current limiting resistors to the LEDs).


Peter



List of 29 messages in thread
TopicAuthorDate
Unable to use P0 and P2            01/01/70 00:00      
   How do you detect that it's ignored?            01/01/70 00:00      
      Philips 80C52            01/01/70 00:00      
         Re: 80xxx            01/01/70 00:00      
         External memory?            01/01/70 00:00      
            Re: External memory?            01/01/70 00:00      
               Check the datasheet!            01/01/70 00:00      
                  More information            01/01/70 00:00      
                     80C52            01/01/70 00:00      
                        I think it does have internal ROM            01/01/70 00:00      
                           oops!            01/01/70 00:00      
         ICE or Eprom Emulator ?            01/01/70 00:00      
            It is an in-circuit emulator            01/01/70 00:00      
   my assumption            01/01/70 00:00      
      I'm afraid it can't be            01/01/70 00:00      
         There's a special "once" mode ... for emulators            01/01/70 00:00      
         try this            01/01/70 00:00      
            Re: try this            01/01/70 00:00      
               My guess            01/01/70 00:00      
                  Read the datasheets and read the posts, Mike            01/01/70 00:00      
            How is all this supposed to help?            01/01/70 00:00      
               It has code space...            01/01/70 00:00      
                  Where did you get that nonsense, Mike?            01/01/70 00:00      
   My conclusion:            01/01/70 00:00      
      What has it to do with the original question?            01/01/70 00:00      
   I do not know your emulator, but            01/01/70 00:00      
      My conclusion (and thanks for everyone)            01/01/70 00:00      
         then why not say so            01/01/70 00:00      
         Emulator            01/01/70 00:00      

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