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???
09/22/06 14:58
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 		 #124885 - Rx+
Responding to: ???'s previous message
There was a fouth version of these devices, the first, called the P89C51Rx+.

NXP devices new from the factory should have the status bit/byte set, therefore causing them to execute the bootloader when powered up. This is often a source of confusion because the hardware ISP entry method is not actually tested until the status bit/byte has been cleared and the device reset. However the user thinks that the hardware ISP entry method worked the first time...

New devices shouldn't transmit anything after reset until they received the autobaud character.

Andy


List of 49 messages in thread
TopicAuthorDate
Need Help: Problem with ISP on P89C51RC2HBA            01/01/70 00:00      
   application?            01/01/70 00:00      
      only if he misspelled            01/01/70 00:00      
         my bad            01/01/70 00:00      
            Still            01/01/70 00:00      
      application?            01/01/70 00:00      
         FIRST, second and third            01/01/70 00:00      
         I'm afraid...            01/01/70 00:00      
            It's in the errata            01/01/70 00:00      
               it's a stupid practice...            01/01/70 00:00      
                  not from their perspective            01/01/70 00:00      
                     we discussed this already many times            01/01/70 00:00      
                     Why not make them OTP's, then?            01/01/70 00:00      
                        they are if you follow the instructions            01/01/70 00:00      
                           compromise            01/01/70 00:00      
                              just exactly HOW do you "push" on the mfg?            01/01/70 00:00      
                                 push on the mfg            01/01/70 00:00      
                                    only works when you spend MONEY            01/01/70 00:00      
                     An Old chip will known Devil ?            01/01/70 00:00      
               bootvector lost already            01/01/70 00:00      
                  there IS code in the chip            01/01/70 00:00      
                     how do you mean?            01/01/70 00:00      
                        Rx+            01/01/70 00:00      
               I found an errata            01/01/70 00:00      
            I'm afraid...            01/01/70 00:00      
               drop me an e-mail via my profile            01/01/70 00:00      
            I'm afraid...            01/01/70 00:00      
   first, second third            01/01/70 00:00      
      Must be an Atmel's micro...            01/01/70 00:00      
         naah, that is NOT the issue            01/01/70 00:00      
      first, second third            01/01/70 00:00      
      first, second third: second            01/01/70 00:00      
         boot vector lost            01/01/70 00:00      
   Try this            01/01/70 00:00      
      Try this            01/01/70 00:00      
         FM            01/01/70 00:00      
            FM            01/01/70 00:00      
               FM can not restore a lost bootvector            01/01/70 00:00      
               it's too late            01/01/70 00:00      
                  it's too late            01/01/70 00:00      
                     do not            01/01/70 00:00      
                        Oh...            01/01/70 00:00      
                           no chip 'requires' reset IC but ALL flash based ..            01/01/70 00:00      
                           the trouble with RC resets...            01/01/70 00:00      
                              How, exactly, did you arrive at this notion?            01/01/70 00:00      
                                 experience...            01/01/70 00:00      
                                 the reason            01/01/70 00:00      
                        Go for the "V"!            01/01/70 00:00      
                           while these are valid concerns            01/01/70 00:00      

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