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06/28/13 23:21
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#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            01/01/70 00:00      
   sounds ok             01/01/70 00:00      
      Model #            01/01/70 00:00      
         Snip first ?            01/01/70 00:00      
            Snipping            01/01/70 00:00      
               Have you considered using adapters?            01/01/70 00:00      
                  Removing ICs            01/01/70 00:00      
                     solder reflow station            01/01/70 00:00      
                        me too            01/01/70 00:00      
               AT89LP51Rx2 series ?            01/01/70 00:00      

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