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???
01/19/07 23:00
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 		 #131147 - nope ... not that simple
Responding to: ???'s previous message
What I have is a fully functional circuit, but, when some of these components are inserted, they don't behave as they should, while others do. The reset is as AMD intended, and the original MCU was an AMD part.

The peculiar behavior with respect to reset didn't come up as an issue until the '90's, apparently. I think this has more ot do with the use of FLASH than with the reset circuit alone. Maybe not ...

The reset waveform is as specified, and no number of power-ons will cause different behavior. They all reset just fine on power-on, but don't reset when the switch is pressed. The reset is a switch to GND, buffered through a 74LS14 hysteresis inverter.

RE



List of 53 messages in thread
TopicAuthorDate
805x system self-test            01/01/70 00:00      
   erk            01/01/70 00:00      
      Well ... it seems to me ...            01/01/70 00:00      
         Not That            01/01/70 00:00      
            Clearly if the CPU is knackered            01/01/70 00:00      
               If you have a new lot of parts ...            01/01/70 00:00      
                  depending on application...            01/01/70 00:00      
                     let me reframe the question ...            01/01/70 00:00      
                        do you want to do the manufacturer's job?            01/01/70 00:00      
                           don't get me wrong            01/01/70 00:00      
                           No, it's not his job ...            01/01/70 00:00      
                  OF COURSE you do            01/01/70 00:00      
                     I don't know which disty's you do biz with ...            01/01/70 00:00      
                        why? what? when? how?            01/01/70 00:00      
                           Where you sit determines what you see.            01/01/70 00:00      
                              not at all            01/01/70 00:00      
                              RC reset            01/01/70 00:00      
                                 on testing            01/01/70 00:00      
                                    re smoke - I just realize            01/01/70 00:00      
                                       5 Volts can produce smoke            01/01/70 00:00      
                                    Why focus on smoke? Have you missed the point?            01/01/70 00:00      
                                 nope ... not that simple            01/01/70 00:00      
                                    but it sounds exactly so...            01/01/70 00:00      
                                       I've tried a MAX1232 ... is that good enough?            01/01/70 00:00      
                                          pushbutton reset            01/01/70 00:00      
                                             pushbutton            01/01/70 00:00      
                                                I don't understand            01/01/70 00:00      
                                                   NO!            01/01/70 00:00      
                                                      some options            01/01/70 00:00      
                                                         That' not exactly the case ...            01/01/70 00:00      
                                                            weird parts            01/01/70 00:00      
                                                               Too bad I didn\'t know about your interest earlier            01/01/70 00:00      
                                                                  your test subjects.... :-)            01/01/70 00:00      
                                                                     under other circumstances ...            01/01/70 00:00      
                           Jan, I think you missed the point            01/01/70 00:00      
                        OH            01/01/70 00:00      
                           Digikey and Mouser aren't "normal" disty's            01/01/70 00:00      
                              You have a very low opinion of distributors, is th            01/01/70 00:00      
                                 Yes I do ...            01/01/70 00:00      
                                    nope            01/01/70 00:00      
               If you have a new lot of parts ...            01/01/70 00:00      
   Your test program            01/01/70 00:00      
      waitaminute ... I didn't say I'd written it ...            01/01/70 00:00      
         Well...            01/01/70 00:00      
            never used a '320.            01/01/70 00:00      
               So...            01/01/70 00:00      
                  I\'ve built 805x stuff since the \'70\'s ...            01/01/70 00:00      
            aackk! it double-posted again            01/01/70 00:00      
   a real example            01/01/70 00:00      
      Testing 8051s            01/01/70 00:00      
         I'm just out to find stuff that's "broken"            01/01/70 00:00      
         how did you come to that figure?            01/01/70 00:00      
            Fault coverage figure            01/01/70 00:00      

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