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???
11/30/12 22:11
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 		 #188930 - another solution
Responding to: ???'s previous message
When touching pin 6 (XTAL1, input, high impedance) the clock stops. But, sometimes, with everything connected to ground (even my body), the program stops and it does not start even after recycling power! It is necessary to reprogram the part.
Solution: cover the Xtal and pin6 area with plastic weldind rod.
another solution: don't touch pin 6. Why would anyone want to do that

It seems that the flash got corrupted by some high voltage spike
not a surprise. If you want to be able to do a touchy feely you need to make sure the decoupling is perfect and that ther are no high impedance entries to the chip such as an unconnected input. (neighbor pin to what you touch)

Erik

List of 33 messages in thread
TopicAuthorDate
C8051F231 experiences            01/01/70 00:00      
   another solution            01/01/70 00:00      
   The probabilities are low...            01/01/70 00:00      
      think about what happens when you add a finger            01/01/70 00:00      
         The point is ...            01/01/70 00:00      
            Yes ... the underlying issue is the flash ...             01/01/70 00:00      
               Out of my office, but...            01/01/70 00:00      
                  Don't think in Vcc, ESD or hum...            01/01/70 00:00      
   Apparently several C8051F2xx parts have the same pinout            01/01/70 00:00      
   Characteristic for in system programmable flash micros...            01/01/70 00:00      
      All too true ... sadly ...             01/01/70 00:00      
         Power-on slope rate...            01/01/70 00:00      
            Sorry, my post should be here, no up there...            01/01/70 00:00      
            Have you any basis for that rate?            01/01/70 00:00      
               Vdd ramp time            01/01/70 00:00      
               Some datasheets show numbers...            01/01/70 00:00      
                  Those aren't the "usual" 805x-core MCU's            01/01/70 00:00      
                     There aren't many "usual" 8051-cores anymore...            01/01/70 00:00      
                        How dangerous power ups can be...            01/01/70 00:00      
                           I believe it            01/01/70 00:00      
                              (dV/dt) examples            01/01/70 00:00      
                                 They don't know it either...            01/01/70 00:00      
                                    dV/dT etc             01/01/70 00:00      
                                       reset request...            01/01/70 00:00      
                                          That's what disturbs me greatly            01/01/70 00:00      
                                             It IS disturbing!            01/01/70 00:00      
                                                Where this began ... at least for me ...             01/01/70 00:00      
                                                   So, you took the hard road...            01/01/70 00:00      
                                                      We've all had that experience             01/01/70 00:00      
   probable cause            01/01/70 00:00      
      Brent, this is very nice            01/01/70 00:00      
         forum no longer down            01/01/70 00:00      
      Thank you!            01/01/70 00:00      

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