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???
07/26/05 20:15
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 		 #98209 - which will not happen
Responding to: ???'s previous message
<i.if previous isr was >256 ticks
How do you detect that? Now reading TH1 as well?

Of course, having more interrupts of the same priority (concurrent) is always tricky and needs extra care...
which will not happen - someone, often even the one who wrote the timet ISR - will expand a IE0 or such ISR and "forget" that this may make the famous once in 4711 hours bug.

Thus DO NOT DO IT

Erik

List of 53 messages in thread
TopicAuthorDate
Pulse Width Modulation Code..giving back            01/01/70 00:00      
   Something else weird            01/01/70 00:00      
      Not Weird            01/01/70 00:00      
         Thanks, good to know.            01/01/70 00:00      
            hexmap, AT89C4051            01/01/70 00:00      
         To be more precise...            01/01/70 00:00      
   Delay ?            01/01/70 00:00      
      Other suggestions?            01/01/70 00:00      
         maybe            01/01/70 00:00      
            Timer ISR Pretty Long            01/01/70 00:00      
               Or simpler ...            01/01/70 00:00      
               not really            01/01/70 00:00      
   Ridicule            01/01/70 00:00      
   this may work!! try out...            01/01/70 00:00      
      Wrong !            01/01/70 00:00      
         my loop for >256 itterations            01/01/70 00:00      
            That's nice, but still ...            01/01/70 00:00      
               no            01/01/70 00:00      
   Using port read backs            01/01/70 00:00      
   Thanks... and some basic timer concepts            01/01/70 00:00      
      some answers            01/01/70 00:00      
         timekeeping            01/01/70 00:00      
            plerase quote everything            01/01/70 00:00      
               bloated ISR?            01/01/70 00:00      
                  This is a nice little bug that show up            01/01/70 00:00      
                     Yes but            01/01/70 00:00      
                        experience... or ....            01/01/70 00:00      
                           What is Erik's 8052 University?            01/01/70 00:00      
                              http://www.8052.com/forum/read.phtml?id=            01/01/70 00:00      
                     well            01/01/70 00:00      
                        Ah but...            01/01/70 00:00      
                        Is that a valid design criteria. Should            01/01/70 00:00      
                     use it later            01/01/70 00:00      
                        based on your post above that includes y            01/01/70 00:00      
                           Try it! (Curious myself) :-)            01/01/70 00:00      
         Still a bit confused            01/01/70 00:00      
            not quite complete            01/01/70 00:00      
               256 cycles            01/01/70 00:00      
                  youn are absolutotally missing the point            01/01/70 00:00      
                     Not a bug at all!            01/01/70 00:00      
                        which will not happen            01/01/70 00:00      
                           who's afraid of the wolf...            01/01/70 00:00      
                              crying wolf once bitten            01/01/70 00:00      
                                 you restriction...            01/01/70 00:00      
                                    Cynicism            01/01/70 00:00      
                                    more widespread among Pascal and C users            01/01/70 00:00      
                              Calculating machine cycles            01/01/70 00:00      
                                 Counting machine cycles            01/01/70 00:00      
                                 Use Keil or JSIM tools            01/01/70 00:00      
                                 the point            01/01/70 00:00      
   PWM with 8051            01/01/70 00:00      
      Some debugging is required            01/01/70 00:00      
NOTICE: Message(s) moved            01/01/70 00:00      

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