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???
12/28/09 15:15
Modified:
  12/28/09 15:15
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Msg Score: +1
 +1 Informative		 #171984 - Not Weird At All
Responding to: ???'s previous message
Fethi:

If you study the 'HC165 shift register data sheet some more you will note that the latched QH value is available at the output of the shift register shortly after the load pulse is completed. Thus you should read this bit into the MCU before doing a clock pulse.

Technically you only need 7 clocks to read all the contents of a single 'HC165 after the load pulse has been finished. In your case the 8th clock that you do beings the initial QH of the second cascaded shift register up to the QH output as seen on the first 'HC165 at the MCU.

Hope that helps....

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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