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???
06/10/09 15:03
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 		 #165989 - I am sure it is something simple.
Responding to: ???'s previous message
You should not have two duff crystals. Double-check your circuit.

If you can write to one register and read it back later then you are communicating OK so your chip is probably fine.

Page 9 of the data sheet shows the circuit. It could not be more simple.
I would try without any capacitors. Then with capacitors.

And as I suggested earlier you can always drive pin X1 from your 8051 anyway just to see if the seconds register updates.

You can always just use the regular 8051 Timer as a software clock. You can implement the day, month year etc in software. If you run it in CTC mode, it will keep time as well as your watch crystal.

Both methods fail when you remove the power.

David.



List of 39 messages in thread
TopicAuthorDate
Interfacing HT1380 with 89C51 in C            01/01/70 00:00      
   It looks like you should read when clock is high            01/01/70 00:00      
      Dear David            01/01/70 00:00      
         Yes. You read after the -ve edge.            01/01/70 00:00      
            Should shift before assign            01/01/70 00:00      
               Dear Per            01/01/70 00:00      
                  Dear Ackhil,            01/01/70 00:00      
                     Amazing . . . ! ! !            01/01/70 00:00      
                        Are you a young man ?            01/01/70 00:00      
            David            01/01/70 00:00      
   keep SCLK low when idle            01/01/70 00:00      
      Dear Stefan            01/01/70 00:00      
         re            01/01/70 00:00      
            Dear Stefan            01/01/70 00:00      
   Still no luck ! !            01/01/70 00:00      
      Code?            01/01/70 00:00      
         Sorry for the incorrect post            01/01/70 00:00      
            Please format your code            01/01/70 00:00      
      keep SCLK low and...pen&paper and...            01/01/70 00:00      
   Dear stefan and david            01/01/70 00:00      
      Do you expect people to format and correct code every t            01/01/70 00:00      
         true 99% of the time            01/01/70 00:00      
            a neat program makes a happy programmer            01/01/70 00:00      
         I tried a pen and paper            01/01/70 00:00      
            'arranging' is good, but how about comments?            01/01/70 00:00      
               I'll improve on that front as well ! !            01/01/70 00:00      
      Hi Akhil , check this            01/01/70 00:00      
         Dear Stefan            01/01/70 00:00      
            Dear Stefan            01/01/70 00:00      
               Congratulations. a good write() and read()            01/01/70 00:00      
                  no luck            01/01/70 00:00      
                     You can always send a clock from 8051.            01/01/70 00:00      
                        i'll do that ! !            01/01/70 00:00      
                        Dear David            01/01/70 00:00      
                           at least X2 must be free, not grounded            01/01/70 00:00      
                           32Mhz ?!            01/01/70 00:00      
                           Do it carefully            01/01/70 00:00      
                              Dear David            01/01/70 00:00      
                                 I am sure it is something simple.            01/01/70 00:00      

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