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???
08/21/06 20:06
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 		 #122731 - Confused
Responding to: ???'s previous message
Erik Malund said:
if movc is disabled the jump table form of a switch statement is required beacuse the 'other' form uses movc.

If movc is disabled, jump tables wont work because you cannot read the table. However, a computed goto will still work.

Ian



List of 38 messages in thread
TopicAuthorDate
Switch/Case and code protection            01/01/70 00:00      
   What does it do?            01/01/70 00:00      
      I activate MOVC Disable.            01/01/70 00:00      
         In that case ...            01/01/70 00:00      
            Can't tell...uses external CCASE routine            01/01/70 00:00      
               Things you can and can't do ...            01/01/70 00:00      
                  it does            01/01/70 00:00      
               (double post, please disregard)            01/01/70 00:00      
   switch can use MOVC instructions            01/01/70 00:00      
      Aha!            01/01/70 00:00      
         protecting LPC chips            01/01/70 00:00      
            protecting LPC chips            01/01/70 00:00      
               Old question            01/01/70 00:00      
                  case            01/01/70 00:00      
                     Errr...            01/01/70 00:00      
                        There is more than just switch/case            01/01/70 00:00      
                           No C without MOVC            01/01/70 00:00      
                              Protection on other derivatives            01/01/70 00:00      
                                 Example - AT89C51            01/01/70 00:00      
                                    AT89C51 can do MOVC internal !            01/01/70 00:00      
                                       nope            01/01/70 00:00      
            LPC Protection            01/01/70 00:00      
               naah, but make it quite a bit more difficult            01/01/70 00:00      
   Compiler Optimisation            01/01/70 00:00      
      sure, but there will still be MOVC            01/01/70 00:00      
         And upgrading the compiler can change the output            01/01/70 00:00      
            the ICEman cometh            01/01/70 00:00      
               I have found no issues with the ICE            01/01/70 00:00      
                  sure it 'works'            01/01/70 00:00      
         The Reason            01/01/70 00:00      
            no, no, no            01/01/70 00:00      
               But you said..            01/01/70 00:00      
                  if you heard what I thought I said            01/01/70 00:00      
                     Confused            01/01/70 00:00      
                        jmp @dptr is not movc            01/01/70 00:00      
                           jmp @dptr is a computed goto not a jump table            01/01/70 00:00      
   what requires a movc???            01/01/70 00:00      
      Jump TABLE            01/01/70 00:00      

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