Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
04/07/06 18:42
Read: times


 		 #113864 - lock bits
Responding to: ???'s previous message
The datasheet and user's guide implies that, once any of the lock bits have been set, the device can no longer be programmed using bootloader mode, or parallel mode. Has anyone of you guys tested this feature?

It seems that using the lock bits turns the device into an OTP part, thereby much reducing its value. I can understand the use of security features to protect proprietary code, but it seems a mite over-the-top for a built-in feature to render the part totally unable to be erased.

Any experiences, thoughts?

RE


List of 41 messages in thread
TopicAuthorDate
DS89C420 Bootloader issues            01/01/70 00:00      
   Well, check the app note.            01/01/70 00:00      
      doesn't run also with 24Mhz            01/01/70 00:00      
         Well, I don't know what to say ...            01/01/70 00:00      
            Errata for some series            01/01/70 00:00      
               Well ... let's wait a while            01/01/70 00:00      
                  I've got a rush job in front of me            01/01/70 00:00      
               B5 - Bootloader            01/01/70 00:00      
                  Have you tried ...            01/01/70 00:00      
                     Some speeds probably won't work            01/01/70 00:00      
                        Loader lite trial            01/01/70 00:00      
                  Symptoms            01/01/70 00:00      
   Loader            01/01/70 00:00      
   lock bits            01/01/70 00:00      
      I doubt it            01/01/70 00:00      
         That's what "they" say ...            01/01/70 00:00      
            naah            01/01/70 00:00      
               Smile when you say that ...            01/01/70 00:00      
      Lock Bits            01/01/70 00:00      
         trust but verify ...            01/01/70 00:00      
   It might be a different issue            01/01/70 00:00      
      Any needed?            01/01/70 00:00      
         perhaps some ...            01/01/70 00:00      
            The issue is not "can you find out it is            01/01/70 00:00      
               Not necessarily ...            01/01/70 00:00      
                  How'd you do that?            01/01/70 00:00      
                     Well i cheated ...            01/01/70 00:00      
                        Gee ... I learn new things every day.            01/01/70 00:00      
      It might be a different issue            01/01/70 00:00      
         the real problem            01/01/70 00:00      
            I get \'em as samples            01/01/70 00:00      
               Small volume part acquisition.            01/01/70 00:00      
                  that's seldom a problem for me            01/01/70 00:00      
               apples and oranges            01/01/70 00:00      
                  It's different here            01/01/70 00:00      
                     a mistake            01/01/70 00:00      
                        that rep WAS the local sales office            01/01/70 00:00      
                           I'm confused or you are            01/01/70 00:00      
                              These guys worked for Philips            01/01/70 00:00      
         Not breaking news, but seems relevant            01/01/70 00:00      
         it's still possibly a different issue            01/01/70 00:00      

Back to Subject List