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???
07/26/05 16:41
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 		 #98182 - 256 cycles
Responding to: ???'s previous message
If the timer-ISR happens to last for >256 (including latency! - for details see "bible") only ocassionally, it should be OK, as the interrupt flag gets cleared when the ISR is entered - so if a timer overflow happens during ISR, it won't be lost.

Nevertheless, you should not count on it.

Jan Waclawek



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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