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Joseph Hebert
06/28/13 17:21
Read: 2320 times
Okemah, Ok
United States

#189969 - Atmel Bootloader/Programming FLASH
Hi Everybody,

Okay, I'll be the first to admit that it's been quite a while since I last did this, so can anyone tell me if Atmel has changed the way their bootloader works in the last couple of years. I am using an AT89C51RC. In the past I could launch the bootloader for FLIP by holding EA hi, PSEN lo, during reset pulse (specifically the NGT edge). With this new chip (it's been on my shelf for about a year and a half, but under controlled humidity and esd conditions) I get the ASCII "U" character (0x55; 0b01010101) for the autobaud routine to the RxD pin (P3.0; pin 11 on PLCC44), but I get no response on the TxD pin (P3.1; pin 13 on PLCC44).

So did Atmel change something and not tell me? Did I miss something? Or am I simply forgetting something about the bootloader sequence?


List of 10 messages in thread
Atmel Bootloader/Programming FLASH      Joseph Hebert      06/28/13 17:21      
   sounds ok       Jim Granville      06/28/13 18:04      
      Model #      Joseph Hebert      06/29/13 03:33      
         Snip first ?      Jim Granville      06/29/13 23:36      
            Snipping      Joseph Hebert      07/01/13 06:35      
               Have you considered using adapters?      Richard Erlacher      07/01/13 07:40      
                  Removing ICs      Mahmood Elnasser      07/01/13 08:44      
                     solder reflow station      Jacob Boyce      07/01/13 09:07      
                        me too      Mahmood Elnasser      07/01/13 13:04      
               AT89LP51Rx2 series ?      Jim Granville      07/01/13 14:32      

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