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06/19/06 10:10
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 		 #118521 - That's a very good put it!
Responding to: ???'s previous message
Joseph Hebert said:
Some might tell you to think of loading 0xFF to P0 as "putting P0 in the input mode." Don't think of it this way. If you do, it will only be a matter of time before you're trying to figure out why something else on the bus isn't working...

That's a very good way of putting it!

This has been discussed innumerable times, making it clear that thinking of "putting P0 in the input mode" is unhelpful and leads to all sorts of confusion!

List of 30 messages in thread
TopicAuthorDate
can P0 of c51input/output at same time            01/01/70 00:00      
   Why the 8255 ?            01/01/70 00:00      
      how to interface 8155            01/01/70 00:00      
         what does that have to do with this thread ?            01/01/70 00:00      
         Clearly, you should read the datasheet(s)            01/01/70 00:00      
   input/output            01/01/70 00:00      
      That's a very good put it!            01/01/70 00:00      
   Hints...            01/01/70 00:00      
      is 8255 really a bad idea???            01/01/70 00:00      
         Maybe            01/01/70 00:00      
            possibilities            01/01/70 00:00      
         Depends on your actual needs            01/01/70 00:00      
         Have you really considered the economics?            01/01/70 00:00      
            not all of us            01/01/70 00:00      
               the REAL question is ...            01/01/70 00:00      
                  answers            01/01/70 00:00      
                  8255 main drawback            01/01/70 00:00      
      Sorry, wrong link!            01/01/70 00:00      
      74HC595            01/01/70 00:00      
         As long as we must guess...            01/01/70 00:00      
            a little correction kai            01/01/70 00:00      
   Serial I/O Expanders            01/01/70 00:00      
      laser diodes/ldr sensors            01/01/70 00:00      
         Inductive loops            01/01/70 00:00      
            need little more info on inductive loop            01/01/70 00:00      
               Inductive loop            01/01/70 00:00      
                  basically an inductive loop is the same            01/01/70 00:00      
   I2C I/O expander            01/01/70 00:00      
      echo            01/01/70 00:00      
   60LEDs: MAX7219            01/01/70 00:00      

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