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???
03/20/07 07:21
Modified:
  03/20/07 07:36
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 		 #135352 - It\\\'s CrazyROM again!
Responding to: ???'s previous message
Dave Brooks said:
that uses external memory (ie: employs the use of PSEN for memory fetches external to the processor)...

In other words, you're talking about effectively disconnecting the Flash from the the 8051, and programming it by completely independent logic?

This is what Mike Stegmaier was trying to do:
http://www.8052.com/forum/read.phtml?id=132082

...and look at the mess it got into!

Far easier to use a 2nd processor to download via a UART connedction:
http://www.8052.com/forum/read.phtml?id=135353

List of 30 messages in thread
TopicAuthorDate
80C51 ISP            01/01/70 00:00      
   80C51            01/01/70 00:00      
      True, but you can get around this...            01/01/70 00:00      
         Which 80C51 is reprogrammable?            01/01/70 00:00      
            Any 80C51..            01/01/70 00:00      
               It\\\'s CrazyROM again!            01/01/70 00:00      
                  Can you name an 80C51 that has FLASH?            01/01/70 00:00      
                     most flash parts are 89xx            01/01/70 00:00      
         Use a second 8051            01/01/70 00:00      
            more idea\'s            01/01/70 00:00      
               Not really            01/01/70 00:00      
                  point taken            01/01/70 00:00      
         sure, you can also hit a nail with a shoe            01/01/70 00:00      
   The AT89S52 can be programmed...            01/01/70 00:00      
   there ain't no such thing            01/01/70 00:00      
   What specific micro do you intend to use?            01/01/70 00:00      
   Many Missed the Point Here            01/01/70 00:00      
      Are you sure?            01/01/70 00:00      
         Michaer, Andy, this is totally academic            01/01/70 00:00      
            Plain speculation            01/01/70 00:00      
               no questions answered            01/01/70 00:00      
                  Again an arbitrary assumption...            01/01/70 00:00      
                     reasonably well            01/01/70 00:00      
                     a common situation            01/01/70 00:00      
                        I am not surprised he's gone            01/01/70 00:00      
                           Scared            01/01/70 00:00      
   the frustration of some            01/01/70 00:00      
      Erik            01/01/70 00:00      
         Who were you talking about?            01/01/70 00:00      
         nobody/nothing            01/01/70 00:00      

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