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???
10/19/10 19:15
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 		 #179197 - BiDir or PushPull
Responding to: ???'s previous message
Is the pin attached to the LED anode programmed to run in the bog standard 8051 style BiDirectional mode (with internal weak pullup) or are you programming it to be a push-pull pin?

Note that a BiDir pin mode sourcing current into an LED and then to a resistor to GND will not be a good way to light the LED. A push-pull pin can source the current needed to light the LED. If you do not have a push-pull output pin then you should connect the port pin to the CATHODE of the LED and the anode to the 330R resistor to VDD.

Michael Karas


List of 49 messages in thread
TopicAuthorDate
p89lpc936 keil programming help required.            01/01/70 00:00      
   magic code?            01/01/70 00:00      
      mov 0A5H,#0FFH            01/01/70 00:00      
   a glaring difference            01/01/70 00:00      
      a glaring difference            01/01/70 00:00      
         what happens if            01/01/70 00:00      
            what happens if            01/01/70 00:00      
               BiDir or PushPull            01/01/70 00:00      
               I leave it to you            01/01/70 00:00      
                  magic code?            01/01/70 00:00      
                  I leave it to you            01/01/70 00:00      
                     1) formatted, 2)commented, 3) correct            01/01/70 00:00      
                        1) formatted, 2)commented, 3) correct            01/01/70 00:00      
                           it is STILL two different things            01/01/70 00:00      
                              Apples and Orange Juice            01/01/70 00:00      
                                 Please focus on the problem i have            01/01/70 00:00      
                                    Software delay loop in C is a no-no            01/01/70 00:00      
                                       Software delay loop in C is a no-no            01/01/70 00:00      
                                          Reduce problem into smaller problems            01/01/70 00:00      
                                             Reduce problem into smaller problems            01/01/70 00:00      
                                             Simulator vs real hardware            01/01/70 00:00      
                                             Current limits            01/01/70 00:00      
                                             Per Westermark's previous message            01/01/70 00:00      
                                                Delay speed            01/01/70 00:00      
                                                   Elaborate            01/01/70 00:00      
                                                      tried 5 for the '51 and Keil won            01/01/70 00:00      
                                    the problem you have is ...            01/01/70 00:00      
                                       the problem you have is ...            01/01/70 00:00      
                                          do you have LEDs connected to the simulator?            01/01/70 00:00      
                                          not executing on actual hardware while simulator is fine            01/01/70 00:00      
                                    Oh So Focused            01/01/70 00:00      
   Double-post            01/01/70 00:00      
   Are you using the limited version of KEIL? the for loop....            01/01/70 00:00      
      valid C            01/01/70 00:00      
         Thats the point            01/01/70 00:00      
            nope            01/01/70 00:00      
               I wouldnt trust it            01/01/70 00:00      
                  if you do not trust it ....            01/01/70 00:00      
               And if you trust it so much why doesnt it work?            01/01/70 00:00      
                  And if you trust it so much why doesnt it work?            01/01/70 00:00      
                     trust, yes, but knowledge also required            01/01/70 00:00      
                  wait call + assumptions about two-complement, ...            01/01/70 00:00      
                     The C Standard            01/01/70 00:00      
                        who is "you"?            01/01/70 00:00      
            Yes, you can!            01/01/70 00:00      
      Quite common loop design for bit operations            01/01/70 00:00      
      for( expression-1; expression-2; expression-3 ) [ed]            01/01/70 00:00      
         erratum            01/01/70 00:00      
            Corrigendum            01/01/70 00:00      

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