Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
02/05/07 16:49
Read: times


 		 #132059 - lets see...
Responding to: ???'s previous message
What is the maximum time you want to wait for a reset?

Most chips work with milliseconds and microseconds.

If you applied the proper reset signal and held it at that level for about 1 second, then you can almost guarantee that a reset has occurred.

Most chips require the time of: oscillator frequency times a special number. I think it is 12.

Also, tie a capacitor (say a 10uF one) around your reset button, so that when you press it, the reset is applied slightly longer than when you let go of the key. A capacitor connected to the button prevents "debouncing". Debouncing happens, because 1/2 the time when you press the button, it releases internally and contacts again (at least from the chip's point of view).

List of 39 messages in thread
TopicAuthorDate
min reset width?            01/01/70 00:00      
   WHY            01/01/70 00:00      
      why?            01/01/70 00:00      
      Which reset chip, and how long a pulse?            01/01/70 00:00      
      "proper supervisor"?            01/01/70 00:00      
         so why ...            01/01/70 00:00      
            Data Sheet vs User Manual            01/01/70 00:00      
               Data Sheet vs User Manual            01/01/70 00:00      
               wherizit?            01/01/70 00:00      
                  Which uP are you looking at?            01/01/70 00:00      
                     P89LPC932A1            01/01/70 00:00      
                        Hey! Where'd you get Rev 2?            01/01/70 00:00      
                           That's it: I said, it is not in the datasheet/UM!            01/01/70 00:00      
                              Webmaster? They have a webmaster?            01/01/70 00:00      
         Only at 5V...            01/01/70 00:00      
         words, words            01/01/70 00:00      
   Does it not have an internal Reset circuit?            01/01/70 00:00      
      now THIS is a BAD documentation            01/01/70 00:00      
         Does it imply            01/01/70 00:00      
            infernal reset (not a typo!)            01/01/70 00:00      
               So, what's the "right" way?            01/01/70 00:00      
                  don't use it as a port pin            01/01/70 00:00      
                     It's not a pitty but a shame!            01/01/70 00:00      
                        it's "creeping feature"-ism            01/01/70 00:00      
                           not a waste            01/01/70 00:00      
         Yes, I remember those many complaints!!            01/01/70 00:00      
         And what about...            01/01/70 00:00      
            internally timed            01/01/70 00:00      
               I LOVE it            01/01/70 00:00      
                  OK so let's vote            01/01/70 00:00      
                     no voting, please            01/01/70 00:00      
                        this is not taste, but facts            01/01/70 00:00      
   So, how's one supposed to reset this thing?            01/01/70 00:00      
   lets see...            01/01/70 00:00      
      Yes, but what's REQUIRED?            01/01/70 00:00      
   Some results            01/01/70 00:00      
      with or without the reset chip?            01/01/70 00:00      
         now with the reset chips            01/01/70 00:00      
            and the troubles were BEFORE or AFTER?            01/01/70 00:00      

Back to Subject List