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???
04/07/05 09:53
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 		 #91158 - I take it back
Responding to: ???'s previous message
I am really stupid, I shouldn't have written this not trying out again - I don't remember properly what I did and saw half as year ago.

Just tried it again and Bill is right - it IS programming the boot vector to 0FCh (and status byte to 0FFh) after full chip erase.

I was confused by the fact that after erasing the boot vector (and status byte) is 00h and not FFh as the rest of the array. This somehow stuck in my mind...

It also does some funny stuff if the frequency is not properly set (using hex record type 02), but this is not really relevant here.

This is an RD2H part.

Jan Waclawek

List of 34 messages in thread
TopicAuthorDate
Philips p89c51RDx Programmer project            01/01/70 00:00      
   Useful Project            01/01/70 00:00      
   Useful Project. Count me in            01/01/70 00:00      
      lets try something....            01/01/70 00:00      
         No Go            01/01/70 00:00      
            see my "other things.."            01/01/70 00:00      
               bootrom code            01/01/70 00:00      
                  Jan, please email me at .....            01/01/70 00:00      
                  BootRom Code            01/01/70 00:00      
                     Boot ROM address range            01/01/70 00:00      
                        2kb boot code            01/01/70 00:00      
                           B oot from External Memory            01/01/70 00:00      
                              !EA/Vpp            01/01/70 00:00      
   why not the simple solution: NoTouch            01/01/70 00:00      
      Too Late            01/01/70 00:00      
         Try this, it has worked for some            01/01/70 00:00      
   Philips's angwer            01/01/70 00:00      
      the most often changed            01/01/70 00:00      
      an RX2 'fix' from the horse's mouth...            01/01/70 00:00      
         neat            01/01/70 00:00      
         Nice!            01/01/70 00:00      
            I'll look tomorrow...            01/01/70 00:00      
               I take it back            01/01/70 00:00      
                  you're NOT as stupid as you think.......            01/01/70 00:00      
         Not possible !!!            01/01/70 00:00      
            respectfully disagree...            01/01/70 00:00      
               Re: respectfully disagree...            01/01/70 00:00      
                  I didcussed it above earlier today...            01/01/70 00:00      
               difference Philips.vs.Atmel            01/01/70 00:00      
                  other things...            01/01/70 00:00      
                     lets make the ckt even simpler...            01/01/70 00:00      
                     maybe ?            01/01/70 00:00      
                        using the EA pin            01/01/70 00:00      
               which bits            01/01/70 00:00      

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