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???
06/27/05 10:57
Modified:
  06/27/05 11:07

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#96005 - Another trick
Responding to: ???'s previous message
Unless you are showing seconds on a display, there is no advantage in counting down in BCD mode. But if you would keep it, I have a little "trick" to add to Oleg's program:
   MOV A,R1
   ADD A,#99H               
   DA  A                      
   MOV R1,A

   JC   OVER
   MOV  R1,#59H
   DEC  R2
   CJNE R2,#0,...
   ...
   CJNE R2,#3,...

OVER: 

Carry always appears - except - when it is time to decrement minutes ...

Slobodan


List of 17 messages in thread
TopicAuthorDate
Countdown with 8051            01/01/70 00:00      
   No Code ,,, But an Idea            01/01/70 00:00      
   Tutorials            01/01/70 00:00      
      Hi.            01/01/70 00:00      
   Third way            01/01/70 00:00      
   I have a part of code...            01/01/70 00:00      
      Delays.....            01/01/70 00:00      
         Countdown            01/01/70 00:00      
            Show us the code !            01/01/70 00:00      
            "The" code...            01/01/70 00:00      
               What ?            01/01/70 00:00      
                  R1 and R2            01/01/70 00:00      
               binary-decimal            01/01/70 00:00      
                  Another trick            01/01/70 00:00      
                     It's working...            01/01/70 00:00      
   Start your count decimal            01/01/70 00:00      
   count down with 8051            01/01/70 00:00      

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