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???
08/10/06 14:26
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 		 #121961 - here
Responding to: ???'s previous message

Input/Output Questions
How can I read a value from an I/O line of the 8052?

What value do the I/O output latches default to?

How can I bring an I/O line high?

How can I bring an I/O line low?

How to set the '51 port pin into input (output) mode?

How to drive a +12V load (e.g. a relay) from 8051 port pin?

How do Quasi-Bidirectional I/O ports work?

Does output logic "low" represent 0V?



List of 31 messages in thread
TopicAuthorDate
FAQ: P89LPC9221            01/01/70 00:00      
   Code Architect            01/01/70 00:00      
   that\'s impossible            01/01/70 00:00      
      pin toggle            01/01/70 00:00      
         Sure, but that does not achieve 3.xx MHz            01/01/70 00:00      
            interrupt            01/01/70 00:00      
               that will not do it as I did show in my post            01/01/70 00:00      
                  mode 2            01/01/70 00:00      
                     slovakian math ?            01/01/70 00:00      
                  usermanual of 89LPC9xx insufficient            01/01/70 00:00      
                     please read the WHOLE thread            01/01/70 00:00      
                        Can timer mode 2 overcome interrupt overhead?            01/01/70 00:00      
                           with mode 2 the reload is automatic as \"the            01/01/70 00:00      
                     did you not read            01/01/70 00:00      
   Re: 50kHz output...            01/01/70 00:00      
   I eneterd a FAQ on this            01/01/70 00:00      
      Where? I can't see it            01/01/70 00:00      
         here            01/01/70 00:00      
            I think you misplaced it...            01/01/70 00:00      
               I placed the FAQ correctly but - shame on me - pl            01/01/70 00:00      
                  What is the fastest frequency of Timer Mode 2            01/01/70 00:00      
                     fastest output            01/01/70 00:00      
                        Couldn't Wait in Endless Loop            01/01/70 00:00      
                           NOOOOOOOOO            01/01/70 00:00      
                              Where should i CPL p0.5 then?            01/01/70 00:00      
                                 oooh, then it's impossible, of course            01/01/70 00:00      
                                    89LPC9221 i2c interface            01/01/70 00:00      
                                       I am against "sharing code" but it is there            01/01/70 00:00      
                                          I2C interface with 89LPC9221            01/01/70 00:00      
                                             what does CodeArchitect do ?            01/01/70 00:00      
                                             push-pull?            01/01/70 00:00      

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