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???
02/19/05 13:34
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#87958 - Re:JTAG
Responding to: ???'s previous message
Hi Ashish,

The point about the reset pin is interesting. I spoke yesterday to support at Cygnal and one question that came up was - had I looked at the reset line. So that was going to be the next task. The reset line presently is pulled up to 3.3v with a 1K resistor without any capacitor at present. For the other 2 micros on the board we use I think either 4.7 or 10K. Maybe the effective time constant of the lower 1K line is allowing some startup spikes through? I will try adding capacitance first as we have the board in production and I don't have room to add a supervisor IC. We should probably add that in the next revision, although we have not had any apparent problems with the other micros.

Thanks for your quick response

John Robbins

List of 19 messages in thread
TopicAuthorDate
JTAG question            01/01/70 00:00      
   re:            01/01/70 00:00      
      Re:JTAG            01/01/70 00:00      
         Stop!!            01/01/70 00:00      
         Not even a question!!            01/01/70 00:00      
            Re:JTAG            01/01/70 00:00      
               Another thing...            01/01/70 00:00      
                  Re:JTAG            01/01/70 00:00      
                     Reset generators`            01/01/70 00:00      
                        SC-70-3 Reset Circuits            01/01/70 00:00      
                  mandatory            01/01/70 00:00      
                     Re:JTAG            01/01/70 00:00      
                        Which all goes to show...            01/01/70 00:00      
            reset supervisor            01/01/70 00:00      
   Re:JTAG            01/01/70 00:00      
      correct, but            01/01/70 00:00      
         Re:JTAG            01/01/70 00:00      
            yes, but            01/01/70 00:00      
               Re:JTAG            01/01/70 00:00      

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