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???
01/13/13 13:37
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 		 #189145 - RMW uses latch
Responding to: ???'s previous message
Hal Albach said:
Your CLEAR: function sets each bit of an output port sequentially and could cause problems. The 8051 ports are all READ-MODIFY-WRITE which means that when you write to the port all the PINS, not the latches, are read, then changed, then written back to the port latches.

No, that's not true. The 8051 uses the latch for Read-Modify-Write instructions.
see: http://www.keil.com/support/m...51_xrl.htm

List of 36 messages in thread
TopicAuthorDate
LED CHASER            01/01/70 00:00      
   To avoid problems            01/01/70 00:00      
      RMW uses latch            01/01/70 00:00      
      LED CHASER            01/01/70 00:00      
         very possible            01/01/70 00:00      
            LED CHASER            01/01/70 00:00      
               Do you know what comments are?            01/01/70 00:00      
                  oddly enough            01/01/70 00:00      
                     Very true            01/01/70 00:00      
                     Design your project in the first place            01/01/70 00:00      
               yes, when            01/01/70 00:00      
                  led chaser_comment            01/01/70 00:00      
                     it would be helpful            01/01/70 00:00      
                        chip             01/01/70 00:00      
                           read the datasheet            01/01/70 00:00      
                              potentiometer            01/01/70 00:00      
                                 Erik's typing            01/01/70 00:00      
                                 RE: potentiometer            01/01/70 00:00      
                              Not entirely true            01/01/70 00:00      
                                 The AT89C2051 has analog comparator            01/01/70 00:00      
                                    LED currents            01/01/70 00:00      
                                       no, you have not            01/01/70 00:00      
                                          comment            01/01/70 00:00      
                                             which is also uncommented scribbles            01/01/70 00:00      
                                                comment            01/01/70 00:00      
                                                   He wants you to put descriptive, detailed comments            01/01/70 00:00      
                                                      thanks             01/01/70 00:00      
                                                         Will you do it?            01/01/70 00:00      
                                                            comment            01/01/70 00:00      
                                                               A method I have used for LED signs            01/01/70 00:00      
                                                                  OMG            01/01/70 00:00      
                                                                     one example, please            01/01/70 00:00      
                                                               bear in mind that not everyone will recognize "LED Chaser"            01/01/70 00:00      
                                                   apparently you still don't know what comments are            01/01/70 00:00      
   no, you don't            01/01/70 00:00      
   ADC with 89C2051 comparator            01/01/70 00:00      

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