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???
03/17/07 16:06
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 		 #135169 - Philips 80C52
Responding to: ???'s previous message

Dear Kai,

The microcontroller is a Philips 80C52, which is being controller by an emulator (Micetek EasyPack 51). I am not sure but I suppose the problem is not related to the emulator, since it is designed to use all 4 ports, and the software too.

Actually I write the code in C, but I can see the assembly code and it simply uses instructions like "MOV P0, R1" and so on.

The very same program works if the used ports are P1 or P3, which I connect to leds (1 led per pin, of course). In the case of P3, the highest 2 bits don't work either (they are always high, I think).

As said before, P2 doesn't work either, it behaves just like P0 (which, by the way, does have pull-up resistors).

I haven't checked the ALE pulses.

I hope this maker in clearer.

Regards,
Mikel



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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