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???
12/29/09 02:51
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 		 #172006 - Load Not Triggering a Shift Cycle
Responding to: ???'s previous message
The load pulse does NOT initiate a shift cycle. The 'HC165 part has eight flip-flops that either load from the parallel input lines OR get data from the previous flip-flop in a shift cycle. The QH output loads asynchronously from the H input and is immediately available to the MCU port pin without any shift cycle.

A shift cycle only becomes necessary when you would like to move the input value stored in the QG flip-flop over to the QH stage where it can then be seen by the MCU.

Michael Karas


List of 31 messages in thread
TopicAuthorDate
74HC165            01/01/70 00:00      
   Document your code            01/01/70 00:00      
      pen and paper            01/01/70 00:00      
         It's still illegible!            01/01/70 00:00      
            code arranged            01/01/70 00:00      
         Why not format your code?            01/01/70 00:00      
            formatted code            01/01/70 00:00      
   Indentation is very Important            01/01/70 00:00      
      "Insert Program Code" Button            01/01/70 00:00      
   what are the expectations...            01/01/70 00:00      
      and the problem is...            01/01/70 00:00      
         your code is ambiguous            01/01/70 00:00      
            succes...            01/01/70 00:00      
               Pen and paper really is a good method            01/01/70 00:00      
                  Thanks & a weird point...            01/01/70 00:00      
                     Not Weird At All            01/01/70 00:00      
                        load pulse timing            01/01/70 00:00      
                           There's a reason why it doesn't say that ...            01/01/70 00:00      
                           Load Not Triggering a Shift Cycle            01/01/70 00:00      
            Working new code part            01/01/70 00:00      
   I think this may help            01/01/70 00:00      
      Same Problem OP First Had            01/01/70 00:00      
         Responding to: Michael            01/01/70 00:00      
            look at a logic diagram of the '165            01/01/70 00:00      
            Oh dear...            01/01/70 00:00      
               To Kai            01/01/70 00:00      
                  No, it never worked!            01/01/70 00:00      
                     try it            01/01/70 00:00      
                        No, the code will destroy the chips...            01/01/70 00:00      
                           Responding to: Kai Klaas's previous message            01/01/70 00:00      
            Responding to: Sherif            01/01/70 00:00      

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