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09/21/06 10:40
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Msg Score: +1
 +1 Good Question		 #124764 - Need Help: Problem with ISP on P89C51RC2HBA
Hello All, Good Morning!. Been a long time since I posted. I am currently working on a small board for a friend. It is based on Phillips P89C51RC2HBA.
My problem is that ISP doesn’t seem to be working. I don’t have any expensive tools… just a Demo Serial monitor, WinISP and Flash Magic.
Configuration in Hardware:
EA set to High(+5v) via 4.7K,
ALE can be made High by Jumper J1.
P2.7 can be made High by Jumper J2.
PSEN can be made low by Jumper J3.
J1 and J2 are via a single 4.7K.
Not connected P2.6 !!
Tried WinISP and Flash magic with various combination of J1,J2 and J3. But cant get the boot code running.
My RS232 circuit is working fine, I assume the Crystal is doing its job just fine, and Reset circuit is perfect.
The Problem:
Via Serial Monitor I see that, after power ON the controller sends bytes 0xFC 0xE0 continuously, and stops when I hold the Reset button. There is almost no response for “U” .. by almost I mean, at one point while I was continuously transmitting “U” via HyperTerminal, I saw one hex byte 0x55 (via serial monitor) sent by controller, but never got that again. Most of my test was at 9600baud. Crystal is 11.0592MHz.
Searched the posts here, but could not uncover the solution. Can some one pls. give me some pointer? Also the doc “AN461” has few versions (dated 2000 & 2001) that have slight variations.
Thanks & Regards
Vignesh

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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