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???
10/12/06 22:43
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 		 #126356 - battery
Responding to: ???'s previous message
Richard said:
I'm thinking that if I allow the osc-out pin to drive a 2-bit shift-register with an XOR across it, it will produce a 2-cycle long reset pulse, as specified in one or another datasheet.

Erik Malund said:
then you better get a separate supply for the logic. How else are you going to guarantee that reset is there when the power supply ramp up.


Yes, a battery.

The best (and most expensive) reset ICs do use them (although only as a side effect as they provide glitch-free chipselect for battery-backuped SRAMs).

Anyway, I wouldn't do that at all. Or, if, I have an oooold idea for a combined reset/wakeup, but I'd need access to IC manufacturing process and a few M$s to make it :-)))

JW

List of 142 messages in thread
TopicAuthorDate
New FAQ            01/01/70 00:00      
   all well and good            01/01/70 00:00      
      OK, "blinkey" there now :-)            01/01/70 00:00      
   Addedto FAQq            01/01/70 00:00      
      I'd call it...            01/01/70 00:00      
         Agreed            01/01/70 00:00      
            missing quotes            01/01/70 00:00      
               it's not a statement            01/01/70 00:00      
            appended            01/01/70 00:00      
   "bible"&co            01/01/70 00:00      
   Jon's RS232 tutorial            01/01/70 00:00      
   code not work            01/01/70 00:00      
   table lookup            01/01/70 00:00      
   ehanced outputs            01/01/70 00:00      
      and extended...            01/01/70 00:00      
         uln            01/01/70 00:00      
            Problem            01/01/70 00:00      
               This happened to me, too            01/01/70 00:00      
                  Bugs            01/01/70 00:00      
            FAQ updated: freewheeling diode            01/01/70 00:00      
   How do Quasi-Bidirectional I/O ports work?            01/01/70 00:00      
      ... and cross-linked...            01/01/70 00:00      
         Space            01/01/70 00:00      
            RE:Space            01/01/70 00:00      
            Would never do that            01/01/70 00:00      
               Might have to !            01/01/70 00:00      
         And criss-cross-linked...            01/01/70 00:00      
   added me own little bit            01/01/70 00:00      
   Does output logic "low" represent 0V?            01/01/70 00:00      
      Nice contribution!            01/01/70 00:00      
         but not new            01/01/70 00:00      
            ???            01/01/70 00:00      
               well, it got the blues            01/01/70 00:00      
                  Cheer up...            01/01/70 00:00      
                     but certainly not the first            01/01/70 00:00      
   device burning            01/01/70 00:00      
      Come on, Jan...            01/01/70 00:00      
         He, who does the work, makes the choices            01/01/70 00:00      
   level/edge interrupt            01/01/70 00:00      
   Added note on use of TABs            01/01/70 00:00      
   updated "code no work" FAQ            01/01/70 00:00      
   What will happen when I use an RC (or C only) rese            01/01/70 00:00      
      What reset ICs are good for '51s?            01/01/70 00:00      
         These things are not necessary ...            01/01/70 00:00      
            You've opened a can of worms now!            01/01/70 00:00      
            you do not use internal flash, do you?            01/01/70 00:00      
               it's broken            01/01/70 00:00      
            can of worms            01/01/70 00:00      
               Something interesting ...            01/01/70 00:00      
                  to reset or not to reset            01/01/70 00:00      
                     It's cheaper and easier to use the linear PSU            01/01/70 00:00      
                        then you better get a separate supply            01/01/70 00:00      
                           That's exactly correct!            01/01/70 00:00      
                              why don't they put in GOOD resets?            01/01/70 00:00      
                                 The RESET circuit on the Maxim/Dallas parts            01/01/70 00:00      
                              you are TOTALLY missing the point            01/01/70 00:00      
                                 rephrasing            01/01/70 00:00      
                                 depends on what your definition of "it" is            01/01/70 00:00      
                           battery            01/01/70 00:00      
                              I think we know enough ...            01/01/70 00:00      
                                 resets, power sources            01/01/70 00:00      
                                 answered above            01/01/70 00:00      
                        spec for RC            01/01/70 00:00      
                           I've heard that sort of thing before ...            01/01/70 00:00      
         My two cents            01/01/70 00:00      
   How to make a software UART?            01/01/70 00:00      
      comments and suggested additions            01/01/70 00:00      
         many thanks            01/01/70 00:00      
            revised revisions            01/01/70 00:00      
               OK            01/01/70 00:00      
   two "basic" faqs            01/01/70 00:00      
   external memory interfacing            01/01/70 00:00      
   how to expand ports            01/01/70 00:00      
      addition to IO FAQ            01/01/70 00:00      
         pretty good, here are comments            01/01/70 00:00      
            thanks            01/01/70 00:00      
               clarifications            01/01/70 00:00      
            it's there            01/01/70 00:00      
               you're forgetting too much!            01/01/70 00:00      
                  OK sorry            01/01/70 00:00      
                     It\'s just easier to type ...            01/01/70 00:00      
                        what about a 'such as'            01/01/70 00:00      
                           the downside is            01/01/70 00:00      
   "what's wrong with 8255" added            01/01/70 00:00      
      assumes facts not in evidence ...            01/01/70 00:00      
         effective?            01/01/70 00:00      
            not even YOU can deny that ...            01/01/70 00:00      
               well, so is a steamroller            01/01/70 00:00      
                  Just how much would it slow you down?            01/01/70 00:00      
                     well there goes central USA            01/01/70 00:00      
                     standard answer            01/01/70 00:00      
                        it's just another temper tantrum from Erik            01/01/70 00:00      
                           it is not the age it is the speed            01/01/70 00:00      
                              get real, Erik            01/01/70 00:00      
                                 if I did not need the speed, I would use a cheaper            01/01/70 00:00      
                                    what about the other 191 bits?            01/01/70 00:00      
                                       Where did I say ONE?            01/01/70 00:00      
                                          it's 192, not ONE            01/01/70 00:00      
                                             that is IMPOSSIBLE            01/01/70 00:00      
                                                Of course it is, but YOU changed the subject            01/01/70 00:00      
                                                   I had posted a lot then I found this            01/01/70 00:00      
                                                      Finally, I've got your attention!            01/01/70 00:00      
                                                         How does that you 'cite' something make it that I            01/01/70 00:00      
                                                            What do you mean by "speed," Erik?            01/01/70 00:00      
                                                               Gentlemen please            01/01/70 00:00      
                                                                  Yes, it's not pretty            01/01/70 00:00      
                                                                     should we just let such go by?            01/01/70 00:00      
                                                                        When you have no role            01/01/70 00:00      
                                                                           correct ?            01/01/70 00:00      
                                                                              but you still have to answer the question            01/01/70 00:00      
                                                                                 The best choice component should be chosen            01/01/70 00:00      
                                                                                    Not this time!            01/01/70 00:00      
                                                                                       Now once more you 'cite' and becuse I have not            01/01/70 00:00      
                                                                                          if the shoe fits ...            01/01/70 00:00      
                                                                                             Once again, you circumvent            01/01/70 00:00      
                                                                                                nope ...            01/01/70 00:00      
                                                                                                   A paradox            01/01/70 00:00      
                                                                                                      have you ever worked for the pointy haired boss            01/01/70 00:00      
                                                                                                      there's a time for everything            01/01/70 00:00      
                                                               here is why            01/01/70 00:00      
                                                                  and here's how            01/01/70 00:00      
                                                                     a trip down memory lane            01/01/70 00:00      
         the intended audience of the faqs are newbies...            01/01/70 00:00      
            but newbies aren't children, and you mustn't lie            01/01/70 00:00      
            EGAD! another double-post            01/01/70 00:00      
   New FAQ: debouncing            01/01/70 00:00      
      contributions to debouncing FAQ            01/01/70 00:00      
         Thanks            01/01/70 00:00      
   http://www.8052.com/faqs.phtml?FAQ=127612            01/01/70 00:00      
   doubt about maskable ROM            01/01/70 00:00      
      not to your advantage, i think            01/01/70 00:00      
   FAQ on ADC            01/01/70 00:00      
   while waiting for a needed device            01/01/70 00:00      
      I would add, that...            01/01/70 00:00      
         will add that in the next minute, thanks            01/01/70 00:00      
      nice!            01/01/70 00:00      
         My two cents and then sum            01/01/70 00:00      
   a good FAQ or other means would be            01/01/70 00:00      
      great idea, start it            01/01/70 00:00      
         you have been unamously by me voted to be            01/01/70 00:00      
            thanks            01/01/70 00:00      
   and one more            01/01/70 00:00      

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