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05/05/05 03:58
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#92959 - Problem using 89C51RD2BN
Hi,

I have been using the 89C51 microcontroller for quite some years.

When I started using the 89C51RD2BN from phillips, it didn't work initially. Then I grounded the PSEN pin as I was using the internal code memory only, then it started working and I did not face any problem.

Recently, the newer lot of 89C51RD2BN did not work. I tried to procure these from different sources, but the controller doesn't seem to work. I am able to burn and verify the internal flash(using parallel programmer), the chip seem to work properly if an external eprom is used, but it does not work using the internal flash.

I am using 11.0592MHz crystal. I have tried burning the chip at both 6 and 12 clock.

My same board works fine with the earlier lots of 89C51RD2BN. What can be the possible problem.

Mohit

List of 11 messages in thread
TopicAuthorDate
Problem using 89C51RD2BN            01/01/70 00:00      
   Some hints...            01/01/70 00:00      
      could be the famous open pin            01/01/70 00:00      
      EA is tied to VCC            01/01/70 00:00      
         are they H?            01/01/70 00:00      
            without 'H'            01/01/70 00:00      
               AN-461            01/01/70 00:00      
                  I am using a parallel programmer            01/01/70 00:00      
                  can the chip go into ISP mode directly            01/01/70 00:00      
                     clear and do not fiddle            01/01/70 00:00      
                        Thanks, it worked            01/01/70 00:00      

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